TM 9-2320-341-10

TECHNICAL MANUAL
OPERATOR'S MANUAL
FOR

TRUCK, TRACTOR, LIGHT EQUIPMENT

TRANSPORTER (LET), 8X8
M983A4 LET
NSN 2320-01-534-2229 (EIC BG4)

Distribution Statement A - Approved for public release; distribution is unlimited.

HEADQUARTERS, DEPARTMENT OF THE ARMY

15 OCTOBER 2008
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WARNING SUMMARY

GENERAL SAFETY CAUTION/WARNING SUMMARY

• This list summarizes critical warnings. They are repeated here to let you know how
important they are.
• Study these warnings carefully.
• They can save your life and the lives of personnel you work with.
• If there is any doubt about handling tools, materials, equipment, and procedures,
see TB 43-0216, Safety and Hazard Warnings for Operation and Maintenance of
TACOM Equipment.

Table 1. Warning Icons Used In This Manual.

WARNING ICON DESCRIPTION

AIR PRESSURE - human hand blocking air gun shows the need
to reduce air pressure before use, or debris may injure user and/
or damage equipment.

BIOLOGICAL - abstract symbol bug shows that a material may

contain bacteria or viruses that present a danger to life or health.

CHEMICAL - drops of liquid on hand shows that the material will

cause burns or irritation to human skin or tissue.

CRYOGENIC - hand in block of ice shows that the material is

extremely cold and can injure human skin and tissue.

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Table 1. Warning Icons Used In This Manual. - Continued

WARNING ICON DESCRIPTION

ELECTRICAL - electrical wire to arm with electricity symbol run-

ning through human body shows that shock hazard is present.

EXPLOSION - rapidly expanding symbol shows that the material

may explode if subjected to high temperatures, sources of igni-
tion, or high pressure.

EXTREMELY COLD SURFACE - hand touching object with ice

formed on both shows that surface is extremely cold and can
damage human tissue.

EYE PROTECTION - person with goggles shows that the mate-

rial will injure the eyes.

FIRE - flame shows that material may ignite and cause burns.

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Table 1. Warning Icons Used In This Manual. - Continued

WARNING ICON DESCRIPTION

FIRE EXTINGUISHER - shows that material may ignite and a fire

extinguisher should be within easy reach.

HEAVY OBJECT - human figure stooping over heavy object

shows physical injury potential for improper lifting technique, and/
or aid of assistant(s) and/or lifting device (as required).

HEAVY PARTS - hand with heavy object on top shows that heavy
parts can crush and harm.

HEAVY PARTS - foot with heavy object on top shows that heavy
parts can crush and harm.

HEAVY PARTS - moving heavy object pinning human figure

against stationary object shows that heavy, moving parts/objects
present a danger to life or limb.

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Table 1. Warning Icons Used In This Manual.

WARNING ICON DESCRIPTION

HEAVY PARTS - heavy object on human figure shows that heavy

parts present a danger to life or limb.

HOT AREA - hand over object radiating heats shows that part is
hot and can burn.

MOVING PARTS - hand with fingers caught between gears

shows that the moving parts of the equipment present a danger
to life or limb.

PRESSURE/TENSION HAZARD - human body being impacted

by rotating projectile shows that equipment is under pressure or
tension presenting a danger to life or limb if pressure or tension
is not carefully released.

PROJECTILE HAZARD - human body with object passing

through it shows that a projectile hazard exists.

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Table 1. Warning Icons Used In This Manual.

WARNING ICON DESCRIPTION

RADIATION - three circular wedges show that the material emits

radioactive energy and can injure human tissue.

ROLLOVER HAZARD - vehicle indicating direction of human fig-

ure shows that vehicle may roll over if conditions are not avoided,
presenting a danger to life or limb.

RUN OVER HAZARD - vehicle running over human body shows

hazard.

SHARP OBJECT - pointed object in hand shows that a sharp

object presents a danger to life or limb.

SKIN IRRITATION - hand radiating shows that material can

cause skin irritation.

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Table 1. Warning Icons Used In This Manual.

WARNING ICON DESCRIPTION

SLICK FLOOR - wavy line on floor with legs prone shows that
slick floor presents a danger of falling.

STEAM HAZARD - human engulfed in steam cloud shows steam

hazard exists that could injure/burn human tissue.

TIRE BLOWOUT - tire with hole shows that an over or under in-
flated tire may rupture, presenting a danger to life or limb.

VAPOR - human figure in a cloud shows that material vapors

present a danger to life or health.

WARNING/CAUTION - triangle with exclamation point within

shows that a WARNING or CAUTION is present that indicates a
potential hazard, which may cause injury or death to personnel
(warning), or damage to equipment (caution).

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Table 1. Warning Icons Used In This Manual.

WARNING ICON DESCRIPTION

WIRE CABLE/ROPE - human hand with frayed wire cable/rope

running across shows injury to unprotected (bare) hands may re-
sult.

FOR INFORMATION ON FIRST AID:

Reference FM 4-25.11. (WP 0146)

WARNING

MODIFICATION HAZARD
• Unauthorized modifications to, alterations to, or installations on this
equipment are prohibited and are in violation of AR 750-10.
• Failure to comply may result in injury or death to personnel or damage
to equipment.

WARNING

HIGH-PRESSURE HYDRAULIC SYSTEM

• Hydraulic systems can cause serious injuries if high-pressure lines
or equipment fails.
• Never work on hydraulic systems or equipment unless there is
another person nearby who is familiar with the operation and hazards
of the equipment and can give first aid.
• Never disconnect any hydraulic hose or part while the engine is
running. Allow several minutes to elapse after shutting off engine, to

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allow pressure to relieve itself, before attempting to remove hoses.

Failure to comply may result in injury to personnel.
• The HEMTT vehicles contain hydraulic systems operating at oil
pressures up to 3,000 psi (20,685 kPa) and 3,200 psi (22,064 kPa).
Never disconnect any hydraulic line or fitting without first dropping
the pressure to zero. Failure to comply may result in serious injury or
death to personnel.

WARNING

ELECTRICAL SYSTEM
• Remove all jewelry, such as rings, ID tags, bracelets, etc. If jewelry
or tools contact electrical circuits, a direct short may result. Failure to
comply may result in serious injury or death to personnel.
• Do not smoke, use open flame, make sparks or other ignition sources
around batteries. A battery giving off gas could explode. Failure to
comply may result in serious injury or death to personnel.
• Be careful when working on or with electrical equipment. Do not be
misled by the term “low voltage”. Voltages as low as 50 volts can
cause death. For artificial respiration, refer to FM 4-25.11.
• When working inside the vehicle with power off, be sure to ground
every capacitor likely to hold a dangerous voltage potential.
• Never work on electronic equipment unless there is another person
nearby who is familiar with the operation and hazards of the
equipment.

WARNING

SOLVENT CLEANING COMPOUND

• Solvent cleaning compound MIL-PRF-680 Type II and III may be
irritating to the eyes and skin. Use protective gloves and goggles. Use
in a well-ventilated area. Use respirator as needed. Accidental
ingestion can cause irritation of digestive tract and respiratory tract,

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may cause lung and central nervous system damage. Can be fatal if
swallowed. Inhalation of high/massive concentrations can cause
coma or be fatal. First aid for ingestion: do not induce vomiting. Seek
immediate medical attention. First aid of skin contact: remove
contaminated clothing. Wash skin thoroughly with soap and water. If
symptoms persist, seek medical attention. First aid for eye contact:
flush with water for 15 minutes or until irritation subsides. If symptoms
persist, seek medical attention. First aid for inhalation: move to fresh
air. If not breathing, provide artificial respiration. If symptoms persist,
seek medical attention. Keep away from open flames and other
sources of ignition. Failure to follow this warning may result in injury
or death to personnel.
• The flashpoint for Type II solvent cleaning compound is 141-198°F
(61-92°C), and Type III is 200-241°F (93-116°C).
• Improper cleaning methods and use of unauthorized cleaning
solvents may injure personnel and damage equipment.
• Fire extinguishers should be placed nearby when using solvent
cleaning compound. Failure to follow this warning may result in injury
or death.
• Cloths or rags saturated with solvent cleaning compound must be
disposed of IAW authorized facilities' procedures. Failure to follow
this warning may result in injury.
• Eye shields must be worn when cleaning with a wire brush. Flying
rust and metal particles may cause injury.

WARNING

POLYURETHANE COATING (CARC)

• Eye and hearing protection must be worn at all times when using
power tools for grinding, cutting, sawing, and drilling. Failure to do so
may result in injury to personnel. Chemical Agent Resistant Coating
(CARC) paint contains isocyanate which is highly irritating to skin and
respiratory system. High concentrations of isocyanate can produce
symptoms of itching and reddening of skin, a burning sensation in the
throat and nose, and watering of the eyes. In extreme concentrations,
isocyanate can cause cough, shortness of breath, pain during
respiration, increased sputum production, and chest tightness. First
aid for ingestion: do not induce vomiting. Seek immediate medical

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attention. First aid for skin contact: remove contaminated clothing.

Wash skin thoroughly with soap and water. If symptoms persist, seek
medical attention. First aid for eye contact: flush with water for 15
minutes or until irritation subsides. If symptoms persist, seek medical
attention. First aid for inhalation: move to fresh air. If not breathing,
provide artificial respiration. If symptoms persist, seek medical
attention.
• The following precautions must be taken whenever using CARC
paint:
• Protective equipment (gloves, goggles, ventilation mask) must be
worn when using CARC paint.
• NEVER cut CARC-coated materials without high-efficiency, air-
purifying respirators in use.
• DO NOT grind or sand painted equipment without high-efficiency, air-
purifying respirators in use.
• BE AWARE of CARC paint exposure symptoms; symptoms can
occur a few days after initial exposure. Seek medical help
immediately if symptoms are detected.
• Use only in well-ventilated area. Check with local environmental
office for methods and locations approved for painting in accordance
with local and state environmental regulations.
• Always use air line respirators when using CARC paint unless air
sampling shows exposure to be below standards. Use chemical
cartridge respirator if air sampling is below standards.

WARNING

ADHESIVE
• Adhesive, solvents and sealing compounds can burn easily and are
harmful causing immediate bonding on contact with eyes, skin, or
clothing and gives off harmful vapors.
• If adhesive, solvent, or sealing compound gets on skin or clothing,
wash immediately with soap and water.
• If adhesive gets in your eyes, try to keep them open; flush them with
water for 15 minutes and get immediate medical attention.
• Wear protective goggles and use in a well-ventilated area.

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• Keep away from open fire and use in well-ventilated area to avoid
injury or death.

WARNING

FLAMMABLE LIQUID AND COMBUSTIBLE VAPOR

• Gasoline, fuel oil, lubricating oil, grease, paint, paint thinner, cleaning
solvents, and other combustible liquids present a serious fire hazard.
• Combustible liquids must ALWAYS be stored in their approved
containers and designated compartments or deck storage locations.
• Ensure exhaust and ventilation fans are operating while using
cleaning solvents or paint products.
• Never store or charge batteries in a confined space without
ventilation or near electrical equipment.
• Fuel is very flammable and can explode easily.
• To avoid serious injury or death, keep fuel away from open fire and
keep fire extinguisher within easy reach when working with fuel.
• Do not work on fuel system when engine is hot. Fuel can be ignited
by hot engine.
• When working with fuel, post signs that read NO SMOKING WITHIN
50 FEET OF VEHICLE.
• Starting fluid is toxic and flammable. Do not store in cab and do not
breathe fumes. Do not puncture or burn containers. Dispose of
container following manufacturer’s recommendations on the
container.

WARNING

MOVING MACHINERY
• Use extreme care when operating or working near moving machinery
including running engine, rotating shafts, and other moving parts.
Failure to comply may result in injury or death to personnel.

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• Use extreme care when measuring voltage while engine is running

around rotating fan blade and hot engine parts. Failure to comply may
result in injury or death to personnel.

WARNING

HEAVY-DUTY WINCH OPERATION

• All personnel must stand clear during winching operations from
possible snapping cable or shifting load. Failure to comply may result
in injury or death to personnel.
• When hooking up for winching operations, position throat (open part)
of hook upward in case overloading straightens out hook. Failure to
comply may result in injury or death to personnel.
• The cable drum requires a minimum of three or four wraps of wire
rope (cable) for safety. Failure to comply may result in injury or death
to personnel.
• Be careful when handling the winch cable. Ensure cut ends are taped.
Ensure cut ends of cable on winch assembly are securely fastened
down. Failure to comply may result in injury or death to personnel.
• Always wear leather gloves when handling winch cable. Failure to
comply may result in injury or death to personnel.

WARNING

PARTS UNDER PRESSURE

• Wear safety goggles and use caution when removing or installing
springs, snap rings, retaining rings, and other parts under spring
tension. These parts can act as projectiles. Failure to comply may
result in injury or death to personnel.
• The radiator is very hot and pressurized during vehicle operation. Let
radiator cool before removing cap. Failure to do so can result in
serious burns.

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• During pressure tests, ensure air pressure is drained to 0 psi (0 kPa)

before taking off any components. If pressure is not released, plates
or line could blow off and harm personnel. Do not drain air from tank
with any part of body in air spray path. Skin embolisms and/or debris
in eyes can occur from released pressure.
• High air pressure may be released from valve stem when valve core
is removed. Stay clear of valve stem after core is removed. Ensure
all personnel wear suitable eye protection. Failure to comply may
result in injury to personnel.
• Stand clear of trajectory area during deflation or personal injury or
death may result.
• Lock-ring is under tension. If lock-ring breaks loose it could cause
injury to personnel. Keep hands and fingers away from lock-ring
when removing.
• Never adjust relief valve so that personnel must stand on strongback
to operate latch.
• If there is any residual pressure in tank when relief valve is open,
personnel may lose their balance and fall. Failure to comply may
result in injury or death to personnel.
• Use extreme care when removing or installing spring retainers.
Spring retainers are under tension and can act as projectiles when
released suddenly. Ensure proper eye protection is worn to prevent
injury to personnel.
• Use extreme care when removing or installing springs. Springs are
under tension and can act as projectiles when released. Ensure
proper eye protection is worn to prevent injury to personnel. Eye
protection is required during all grinding operations. Failure to comply
may result in serious injury to personnel.
• Failure to relieve tank pressure may result in sudden, unexpected
loss of pressure. Failure to comply may result in personal injury or
death.
• Do not remove the radiator cap when the engine is hot, as steam and
hot coolant can escape. Failure to comply may result in personal
injury or death.

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WARNING

HEAVY PARTS
Any part or component that weigh over 50 lbs (23 kg) must be removed
with the aid of an assistant and a lifting device. Failure to comply may
result in personal injury or death.

WARNING

CARBON MONOXIDE (EXHAUST GAS) CAN CAUSE DEATH

• Carbon monoxide does not have color or smell and can cause death.
• Breathing air with carbon monoxide produces symptoms of
headache, dizziness, loss of muscular control, a sleepy feeling and
coma. Brain damage or death can result from heavy exposure.
• Carbon monoxide is in exhaust fumes of fuel-burning heaters and
internal combustion engines.
• Carbon monoxide can become dangerously concentrated under
conditions of no ventilation.
• Precautions must be followed to ensure crew safety when the
personnel heater or engine of any vehicle is operated for any
purpose. Failure to comply may result in injury or death to personnel.
• DO NOT operate vehicle engine in a closed place unless the place
has proper ventilation. Failure to comply may result in injury or death
to personnel.
• DO NOT drive any vehicle with inspection plates, cover plates, or
engine compartment covers removed unless necessary for
maintenance purposes. Failure to comply may result in injury or death
to personnel.
• BE ALERT at all times during vehicle operation for exhaust odors and
exposure symptoms. If either odor or exposure symptoms are
present, IMMEDIATELY VENTILATE personnel compartments. If
symptoms continue, remove affected crew to fresh air and keep

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warm. DO NOT PERMIT PHYSICAL EXERCISE. If necessary, give

artificial respiration and get immediate medical attention. For artificial
respiration, refer to FM 4-25.11 . Failure to comply may result in injury
or death to personnel.
• BE AWARE that the gas particulate filter unit or the field protection
mask for nuclear-biological-chemical protection WILL NOT offer
safety from carbon monoxide poisoning.

WARNING

EXTREME HEAT
If required to remain inside the vehicle during extreme heat, occupants
should follow the water intake, work/rest cycle, and other heat stress
preventive medicine measures contained in FM 21-10, Field Hygiene and
Sanitation.

WARNING

CABLES
• Always wear heavy gloves when handling winch cables; never let
cable run through hands. Frayed cables can cut. Failure to comply
may result in injury or death to personnel.
• Never operate winch with less than five wraps of cable on winch
drum. Frayed cables can cut. Failure to comply may result in injury
or death to personnel.

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WARNING

LEAD-ACID BATTERIES
• Wear proper eye protection when working around batteries. Failure
to comply may result in injury or death to personnel.
• Use extreme care not to short out battery terminals. Remove all
jewelry such as rings, ID tags, bracelets, etc. prior to working on or
around vehicle. Jewelry and tools can catch on equipment, contact
positive electrical circuits, and cause a direct short, severe burns, or
electrical shock. Failure to comply may result in injury or death to
personnel.
• Batteries produce explosive gases. Do not smoke or use open flame
near batteries. Do not allow hot, sparking, or glowing objects near
batteries. If batteries are giving off gases, presence of a heat, flame,
or spark may cause fire and/or explosion. Failure to comply may
result in injury or death to personnel.
• Battery electrolyte is harmful to skin, and eyes. Avoid battery
electrolyte contact with skin, eyes, or clothing. If battery electrolyte
spills, take immediate action to stop burning effects:
.

WARNING

NBC
• NBC-contaminated air filters must be handled and disposed of only
by authorized and trained personnel.
• The unit commander or senior officer in charge of maintenance
personnel must ensure that prescribed protective clothing (FM

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3-11.4) is used, and prescribed safety measures and

decontamination procedures (FM 3-11.5) are followed.
• The local unit SOP is responsible for final disposal of contaminated
air filters. Failure to comply may cause severe injury or death to
personnel.

WARNING

TIRE OPERATION
• Operating a vehicle with a tire in an overinflated or underinflated
condition, or with a questionable defect, may lead to premature tire
failure. Ensure tire has proper tire pressure. Failure to comply may
result in injury or death to personnel.
• When inflating tires mounted on the vehicle, all personnel must
remain out of trajectory of the side ring and lock-ring as shown by the
areas indicated. Failure to follow proper procedures may result in
serious injury or death to personnel.
• Cracked, broken, bent or otherwise damaged rim components shall
not be reworked, welded, brazed, or otherwise heated or damage or
personal injury or death may result.
• No heat shall be applied to a multi-piece wheel or wheel component
or damage or injury or death may result.
• Failure to place wheel/tire assembly in safety cage prior to initial
inflation could result in serious injury or death to personnel.
• When a wheel/tire is in a restraining device, do not rest or lean any
part of body or equipment on or against the restraining device, or
injury or death could result.
• While changing tires or while performing tire maintenance, stay out
of the trajectory path. Failure to comply may result in injury or death
to personnel.
• Always use an inflation hose with an in-line gauge and a clip-on chuck
when inflating tires. The gauge and valve must be mounted a
minimum of 10 feet (3.10 m) away from air chuck.
• High air pressure may be released from valve stem when valve core
is removed. Stay clear of valve stem after core is removed. Ensure

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all personnel wear suitable eye protection. Failure to comply may

result in injury to personnel.
• Tire is heavy. Brace tire to ensure tire will not fall over on you or on
others.

WARNING

VEHICLE OPERATION
• Speed limits posted on curves reflect speeds that are considered safe
for automobiles. Heavy trucks with a high center of gravity can roll
over at these speed limits. Use caution and reduce your speed below
the posted limit before entering a curve. Failure to comply may result
in vehicle crash and injury to personnel.
• Use caution and reduce your speed below the posted limit before
entering a curve. Failure to comply may result in vehicle crash and
injury to personnel.
• Always use seatbelts when operating vehicle. Failure to use seatbelt
can result in serious injury or death in case of accident.
• Operation at speeds over 15 mph (24 kph) on paved roads can be
achieved when the operator determines that the vehicle being towed
and the terrain allow safe operation.
• Under no condition can speeds over 35 mph (55 kph) on paved road
and 15 mph (24 kph) off-road be allowed. Loss of control can cause
serious injury or death. Excessive speed can cause damage to
vehicle being towed.

WARNING

BRAKES
• Ensure all personnel are clear from front of truck before performing
brake stall check. Be ready to apply service brake. Operator must
remain in cab while performing this check. Failure to comply could
result in personnel injury.

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• Never use parking brake for normal braking or wheels will lock up
causing severe skid. Skidding vehicle may result in serious personal
injury or death.
• Do not use trailer brakes as a parking brake. Trailer brakes may not
hold loaded vehicle and trailer on a grade. A runaway vehicle may
cause severe personal injury or death.
• Engine must be shut OFF and parking brake set before performing
PMCS walkaround. Failure to comply may result in injury or death to
personnel.

WARNING

BURNS
The exhaust pipe and muffler can become very hot during vehicle
operation. Be careful not to touch these parts with bare hands, or allow
body to come in contact with exhaust pipe or muffler. Exhaust system
parts can become hot enough to cause serious burns.

WARNING

HEARING PROTECTION
• Excessive noise levels are present any time the heavy-duty winch or
crane is operating.
• Wear single hearing protection (earplugs or equivalent) while working
around equipment while it is running. Failure to do so could result in
damage to your hearing.
• Seek medical aid should you suspect a hearing problem.

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WARNING

COMPRESSED AIR
• Brake shoes may be coated with dust. Breathing this dust may be
harmful to your health.
• Do not use compressed air to clean brake shoes. Wear a filter mask
approved for use against brake dust. Failure to comply may result in
injury or death to personnel.
• Compressed air used for cleaning purposes will not exceed 30 psi
(207 kPa).
• Use only with effective chip guarding and personal protective
equipment, goggles, shield, and gloves.

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LIST OF EFFECTIVE PAGES/WORK PACKAGES

NOTE:
Zero in the "Change No." column indicates an original page or work pack-
age.

Date of issue for the original manual is:

Original 15 October 2008

TOTAL NUMBER OF PAGES FOR FRONT AND REAR

MATTER IS 68 AND TOTAL NUMBER OF WORK PACKAGES
IS 149, CONSISTING OF THE FOLLOWING.

Change Change
Page/WP No. No. Page/WP No. No.

Front Cover 0 WP 0023 (2 pages) 0

Warning Summary 0 WP 0024 (2 pages) 0
i-xxxviii 0 WP 0025 (2 pages) 0
Chp 1 - General Information, WP 0026 (4 pages) 0
Equipment Description and WP 0027 (2 pages) 0
Theory of Operation 0 WP 0028 (4 pages) 0
WP 0001 (10 pages) 0 WP 0029 (4 pages) 0
WP 0002 (8 pages) 0 WP 0030 (2 pages) 0
WP 0003 (2 pages) 0 WP 0031 (2 pages) 0
WP 0004 (6 pages) 0 WP 0032 (6 pages) 0
WP 0005 (4 pages) 0 WP 0033 (4 pages) 0
WP 0006 (10 pages) 0 WP 0034 (4 pages) 0
WP 0007 (2 pages) 0 WP 0035 (2 pages) 0
WP 0008 (2 pages) 0 WP 0036 (6 pages) 0
WP 0009 (4 pages) 0 WP 0037 (14 pages) 0
WP 0010 (2 pages) 0 WP 0038 (18 pages) 0
WP 0011 (2 pages) 0 WP 0039 (10 pages) 0
WP 0012 (8 pages) 0 WP 0040 (4 pages) 0
WP 0013 (8 pages) 0 WP 0041 (28 pages) 0
WP 0014 (2 pages) 0 WP 0042 (18 pages) 0
WP 0015 (2 pages) 0 WP 0043 (22 pages) 0
WP 0016 (2 pages) 0 WP 0044 (8 pages) 0
Chp 2 - Operator Instructions 0 WP 0045 (2 pages) 0
WP 0017 (2 pages) 0 WP 0046 (2 pages) 0
WP 0018 (4 pages) 0 WP 0047 (2 pages) 0
WP 0019 (2 pages) 0 WP 0048 (4 pages) 0
WP 0020 (16 pages) 0 WP 0049 (2 pages) 0
WP 0021 (6 pages) 0 WP 0050 (2 pages) 0
WP 0022 (2 pages) 0 WP 0051 (4 pages) 0

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Change Change
Page/WP No. No. Page/WP No. No.

WP 0052 (6 pages) 0 WP 0096 (2 pages) 0

WP 0053 (2 pages) 0 WP 0097 (6 pages) 0
WP 0054 (2 pages) 0 WP 0098 (4 pages) 0
WP 0055 (2 pages) 0 WP 0099 (8 pages) 0
WP 0056 (2 pages) 0 WP 0100 (2 pages) 0
WP 0057 (2 pages) 0 WP 0101 (4 pages) 0
WP 0058 (4 pages) 0 WP 0102 (8 pages) 0
WP 0059 (4 pages) 0 Chp 3 - Troubleshooting
WP 0060 (2 pages) 0 Procedures 0
WP 0061 (2 pages) 0 WP 0103 (8 pages) 0
WP 0062 (2 pages) 0 WP 0104 (8 pages) 0
WP 0063 (4 pages) 0 WP 0105 (4 pages) 0
WP 0064 (2 pages) 0 WP 0106 (6 pages) 0
WP 0065 (4 pages) 0 WP 0107 (4 pages) 0
WP 0066 (2 pages) 0 WP 0108 (4 pages) 0
WP 0067 (2 pages) 0 WP 0109 (4 pages) 0
WP 0068 (4 pages) 0 WP 0110 (4 pages) 0
WP 0069 (4 pages) 0 WP 0111 (4 pages) 0
WP 0070 (4 pages) 0 WP 0112 (4 pages) 0
WP 0071 (2 pages) 0 WP 0113 (4 pages) 0
WP 0072 (2 pages) 0 WP 0114 (2 pages) 0
WP 0073 (2 pages) 0 WP 0115 (4 pages) 0
WP 0074 (2 pages) 0 WP 0116 (6 pages) 0
WP 0075 (4 pages) 0 WP 0117 (4 pages) 0
WP 0076 (2 pages) 0 WP 0118 (2 pages) 0
WP 0077 (24 pages) 0 WP 0119 (4 pages) 0
WP 0078 (4 pages) 0 WP 0120 (6 pages) 0
WP 0079 (8 pages) 0 WP 0121 (2 pages) 0
WP 0080 (4 pages) 0 WP 0122 (2 pages) 0
WP 0081 (2 pages) 0 WP 0123 (4 pages) 0
WP 0082 (16 pages) 0 WP 0124 (2 pages) 0
WP 0083 (18 pages) 0 WP 0125 (4 pages) 0
WP 0084 (14 pages) 0 WP 0126 (2 pages) 0
WP 0085 (2 pages) 0 Chp 4 - Preventive Maintenance
WP 0086 (4 pages) 0 Checks and Services (PMCS) 0
WP 0087 (2 pages) 0 WP 0127 (4 pages) 0
WP 0088 (16 pages) 0 WP 0128 (38 pages) 0
WP 0089 (4 pages) 0 WP 0129 (12 pages) 0
WP 0090 (2 pages) 0 WP 0130 (22 pages) 0
WP 0091 (4 pages) 0 WP 0131 (36 pages) 0
WP 0092 (2 pages) 0 WP 0132 (16 pages) 0
WP 0093 (6 pages) 0 WP 0133 (10 pages) 0
WP 0094 (2 pages) 0
WP 0095 (2 pages) 0

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Change Change
Page/WP No. No. Page/WP No. No.

Chp 5 - Maintenance WP 0141 (8 pages) 0

Instructions 0 WP 0142 (6 pages) 0
WP 0134 (14 pages) 0 WP 0143 (8 pages) 0
WP 0135 (4 pages) 0 WP 0144 (4 pages) 0
WP 0136 (6 pages) 0 WP 0145 (2 pages) 0
WP 0137 (2 pages) 0 Chp 6 - Supporting Information 0
WP 0138 (18 pages) 0 WP 0146 (6 pages) 0
WP 0139 (2 pages) 0 WP 0147 (12 pages) 0
WP 0140 (6 pages) 0 WP 0148 (4 pages) 0
WP 0149 (8 pages) 0

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HEADQUARTERS
DEPARTMENT OF THE ARMY
WASHINGTON D.C., 15 OCTOBER 2008

TECHNICAL MANUAL

OPERATOR'S MANUAL
TRUCK, TRACTOR, LIGHT EQUIPMENT TRANSPORTER (LET), 8X8
M983A4LET
NSN 2320-01-534-2229

REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS

You can help improve this publication. If you find any errors, or if you would
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(Recommended Changes to Publications and Blank Forms) through the
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The fax number is DSN 793-0726 or Commercial (309) 782-0726.

Distribution A - Approved for public release; distribution is unlimited.

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TABLE OF CONTENTS

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Warning Summary

How to Use this Manual

Chapter 1 - General Information, Equipment Description and Theory of

Operation

INTRODUCTION.......................................................................................... WP 0001

Table 1. Overview.............................................................. 0001-1

Figure 1. ............................................................................. 0001-1

Table 2. Common Nomenclature........................................ 0001-3

Table 3. Common Abbreviations......................................... 0001-4

Table 4. Significant Hazard And Safety

Recommendations............................................................... 0001-9

WARRANTY PROGRAM............................................................................. WP 0002

Table 1. Vehicle Information.............................................. 0002-3

EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES..... WP 0003

LOCATION AND DESCRIPTION OF MAJOR COMPONENTS................... WP 0004

Table 1. HEMTT Series Vehicle Common

Component Location............................................................ 0004-1

Figure 1. ............................................................................. 0004-1

Figure 2. ............................................................................. 0004-2

Table 2. M983A4 LET Tractor Vehicle Specific

Component Location............................................................ 0004-4

Figure 3. ............................................................................. 0004-4

DIFFERENCES BETWEEN MODELS......................................................... WP 0005

Table 1. Differences Between HEMTT A4 Models.............. 0005-1

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Table 2. Notes..................................................................... 0005-2

EQUIPMENT DATA...................................................................................... WP 0006

Table 1. Vehicle Operation.................................................. 0006-1

Table 2. M983A4 LET Vehicle Dimensions......................... 0006-1

Table 3. M983A4 LET Vehicle Weight................................ 0006-1

Table 4. M983A4 LET Vehicle Weight Distribution............. 0006-2

Table 5. Vehicle Performance............................................. 0006-2

Table 6. Fluid Capacities..................................................... 0006-3

Table 7. Engine................................................................... 0006-3

Table 8. Fuel System.......................................................... 0006-4

Table 9. Electrical System................................................... 0006-4

Table 10. Cooling System................................................... 0006-4

Table 11. Transmission....................................................... 0006-4

Table 12. Transfer Case..................................................... 0006-5

Table 13. Front Tandem Axles............................................ 0006-5

Table 14. Rear Tandem Axles............................................ 0006-5

Table 15. Brake System...................................................... 0006-5

Table 16. Wheels................................................................ 0006-6

Table 17. Tires.................................................................... 0006-6

Table 18. Steering System.................................................. 0006-6

Table 19. Towing Eyes........................................................ 0006-6

Table 20. Pintle Hook.......................................................... 0006-6

Table 21. Fifth Wheel.......................................................... 0006-7

Table 22. Cab...................................................................... 0006-7

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Table 23. Heavy-Duty Winch.............................................. 0006-7

Table 24. Auxiliary Equipment............................................ 0006-8

Table 25. M983A4 LET Tractor Vehicle Load

Classification........................................................................ 0006-8

Table 26. M983A4 LET Tractor Vehicle Tire Pressures...... 0006-8

Table 27. Operating Speeds............................................... 0006-9

SELF-RECOVERY WINCH.......................................................................... WP 0007

Figure 1. ............................................................................. 0007-1

ELECTRICAL SYSTEM................................................................................ WP 0008

Figure 1. ............................................................................. 0008-1

AIR SYSTEM................................................................................................ WP 0009

Figure 1. ............................................................................. 0009-2

MAIN HYDRAULIC SYSTEM....................................................................... WP 0010

Figure 1. ............................................................................. 0010-1

Figure 2. ............................................................................. 0010-2

STEERING SYSTEM................................................................................... WP 0011

Figure 1. ............................................................................. 0011-1

POWER TRAIN............................................................................................ WP 0012

Figure 1. ............................................................................. 0012-1

Figure 2. ............................................................................. 0012-3

Figure 3. ............................................................................. 0012-5

Figure 4. ............................................................................. 0012-6

Figure 5. ............................................................................. 0012-6

Figure 6. ............................................................................. 0012-7

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ENGINE SYSTEMS...................................................................................... WP 0013

Figure 1. ............................................................................. 0013-1

Figure 2. ............................................................................. 0013-2

Figure 3. ............................................................................. 0013-3

Figure 4. ............................................................................. 0013-4

Figure 5. ............................................................................. 0013-6

CAB.............................................................................................................. WP 0014

Figure 1. ............................................................................. 0014-1

WHEELS AND TIRES.................................................................................. WP 0015

Figure 1. ............................................................................. 0015-1

HEAVY-DUTY WINCH................................................................................. WP 0016

Figure 1. ............................................................................. 0016-1

Chapter 2 - Operator Instructions

CAB-MOUNTED FOOT CONTROLS........................................................... WP 0017

Table 1. Cab-Mounted Foot Controls.................................. 0017-1

Figure 1. ............................................................................. 0017-1

CAB-MOUNTED HAND CONTROLS........................................................... WP 0018

Table 1. Cab-Mounted Hand Controls................................ 0018-2

Figure 1. ............................................................................. 0018-2

STEERING COLUMN MOUNTED CONTROLS.......................................... WP 0019

Table 1. Steering Column Mounted Controls...................... 0019-1

Figure 1. ............................................................................. 0019-1

INSTRUMENT PANEL CONTROLS AND INDICATORS............................ WP 0020

Table 1. Instrument Panel Controls and Indicators............. 0020-1

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Figure 1. ............................................................................. 0020-1

Figure 2. ............................................................................. 0020-2

Figure 3. ............................................................................. 0020-3

Figure 4. ............................................................................. 0020-4

Figure 5. ............................................................................. 0020-6

Figure 6. ............................................................................. 0020-9

Figure 7. ............................................................................. 0020-13

HEATER COMPARTMENT CONTROLS AND INDICATORS..................... WP 0021

Table 1. Heater Compartment Controls and Indicators....... 0021-1

Figure 1. ............................................................................. 0021-1

Figure 2. ............................................................................. 0021-4

Figure 3. ............................................................................. 0021-5

CENTER DASH PANEL CONTROLS.......................................................... WP 0022

Table 1. Center Dash Panel Controls................................. 0022-1

Figure 1. ............................................................................. 0022-1

OPERATOR AND CREW FOUR-POINT SEATBELT/AIR-RIDE SEAT

ADJUSTMENT CONTROLS........................................................................ WP 0023

Table 1. Operator and Crew Four-Point Seatbelt/

Air-Ride Seat Adjustment Controls...................................... 0023-1

Figure 1. ............................................................................. 0023-1

24V BATTERY DISCONNECT SWITCH...................................................... WP 0024

Table 1. 24V Battery Disconnect Switch............................. 0024-2

Figure 1. ............................................................................. 0024-2

HYDRAULIC SELECTOR VALVE CONTROL............................................. WP 0025

Table 1. Hydraulic Selector Valve Control.......................... 0025-2

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Figure 1. ............................................................................. 0025-2

TIRE CARRIER PUMP CONTROLS............................................................ WP 0026

Table 1. Tire Carrier Pump Controls................................... 0026-2

Figure 1. ............................................................................. 0026-2

SUSPENSION DUMP VALVE CONTROL................................................... WP 0027

Table 1. Suspension Dump Valve Control.......................... 0027-1

Figure 1. ............................................................................. 0027-1

HEAVY-DUTY WINCH CONTROLS............................................................ WP 0028

Table 1. Heavy-Duty Winch Controls.................................. 0028-2

Figure 1. ............................................................................. 0028-2

RIFLE STOWAGE MOUNT.......................................................................... WP 0029

Table 1. Rifle Stowage Mount............................................. 0029-2

Figure 1. ............................................................................. 0029-2

FIFTH WHEEL CONTROLS......................................................................... WP 0030

Table 1. Fifth Wheel Controls.............................................. 0030-1

Figure 1. ............................................................................. 0030-1

OPERATE WINDSHIELD WIPERS/WASHER............................................. WP 0031

Figure 1. ............................................................................. 0031-1

Figure 2. ............................................................................. 0031-2

OPERATE CAB TEMPERATURE CONTROLS........................................... WP 0032

Figure 1. ............................................................................. 0032-2

Figure 2. ............................................................................. 0032-4

Figure 3. ............................................................................. 0032-5

OPERATE FIRE EXTINGUISHER............................................................... WP 0033

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Figure 1. ............................................................................. 0033-1

Figure 2. ............................................................................. 0033-2

Figure 3. ............................................................................. 0033-3

OPERATE ACCESS LADDER..................................................................... WP 0034

Figure 1. ............................................................................. 0034-1

Figure 2. ............................................................................. 0034-2

Figure 3. ............................................................................. 0034-3

OPERATE DRAIN PLUG............................................................................. WP 0035

Figure 1. ............................................................................. 0035-1

Figure 2. ............................................................................. 0035-2

OPERATE AIR SUSPENSION DUMP VALVE............................................. WP 0036

Figure 1. ............................................................................. 0036-2

Figure 2. ............................................................................. 0036-3

Figure 3. ............................................................................. 0036-4

Figure 4. ............................................................................. 0036-5

Figure 5. ............................................................................. 0036-6

HEAVY-DUTY WINCH OPERATION USING VEHICLE MOUNTED

(MANUAL) CONTROLS............................................................................... WP 0037

Figure 1. ............................................................................. 0037-2

Figure 2. ............................................................................. 0037-3

Figure 3. ............................................................................. 0037-3

Figure 4. ............................................................................. 0037-5

Figure 5. ............................................................................. 0037-6

Figure 6. ............................................................................. 0037-7

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Table 1. Heavy-Duty Winch Pull Capacity......................... 0037-8

Figure 7. ............................................................................. 0037-9

Figure 8. ............................................................................. 0037-11

Figure 9. ............................................................................. 0037-13

Figure 10. ........................................................................... 0037-14

OPERATE TIRE CARRIER.......................................................................... WP 0038

Figure 1. ............................................................................. 0038-2

Figure 2. ............................................................................. 0038-3

Figure 3. ............................................................................. 0038-3

Figure 4. ............................................................................. 0038-4

Figure 5. ............................................................................. 0038-5

Figure 6. ............................................................................. 0038-6

Figure 7. ............................................................................. 0038-8

Figure 8. ............................................................................. 0038-9

Figure 9. ............................................................................. 0038-10

Figure 10. ........................................................................... 0038-11

Figure 11. ........................................................................... 0038-12

Figure 12. ........................................................................... 0038-13

Figure 13. ........................................................................... 0038-14

Figure 14. ........................................................................... 0038-15

Figure 15. ........................................................................... 0038-16

Figure 16. ........................................................................... 0038-17

OPERATE INSTRUMENT PANEL............................................................... WP 0039

Figure 1. ............................................................................. 0039-1

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Figure 2. ............................................................................. 0039-2

Figure 3. ............................................................................. 0039-3

Figure 4. ............................................................................. 0039-4

Figure 5. ............................................................................. 0039-4

Figure 6. ............................................................................. 0039-5

Figure 7. ............................................................................. 0039-5

Figure 8. ............................................................................. 0039-6

Figure 9. ............................................................................. 0039-6

Figure 10. ........................................................................... 0039-7

Figure 11. ........................................................................... 0039-7

Figure 12. ........................................................................... 0039-8

Figure 13. ........................................................................... 0039-8

Figure 14. ........................................................................... 0039-9

Figure 15. ........................................................................... 0039-9

Figure 16. ........................................................................... 0039-10

OPERATE AIR SUSPENSION BALL VALVES............................................ WP 0040

Figure 1. ............................................................................. 0040-2

Figure 2. ............................................................................. 0040-4

CONNECT/DISCONNECT M870/M870A1 SEMITRAILER.......................... WP 0041

Table 1. Lockout Requirements.......................................... 0041-2

Figure 1. ............................................................................. 0041-2

Figure 2. ............................................................................. 0041-4

Figure 3. ............................................................................. 0041-6

Figure 4. ............................................................................. 0041-7

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Figure 5. ............................................................................. 0041-8

Figure 6. ............................................................................. 0041-9

Figure 7. ............................................................................. 0041-10

Figure 8. ............................................................................. 0041-10

Figure 9. ............................................................................. 0041-11

Figure 10. ........................................................................... 0041-12

Figure 11. ........................................................................... 0041-13

Figure 12. ........................................................................... 0041-15

Figure 13. ........................................................................... 0041-15

Figure 14. ........................................................................... 0041-16

Figure 15. ........................................................................... 0041-17

Figure 16. ........................................................................... 0041-18

Figure 17. ........................................................................... 0041-19

Figure 18. ........................................................................... 0041-20

Figure 19. ........................................................................... 0041-21

Figure 20. ........................................................................... 0041-21

Figure 21. ........................................................................... 0041-22

Figure 22. ........................................................................... 0041-22

Figure 23. ........................................................................... 0041-24

Figure 24. ........................................................................... 0041-24

Figure 25. ........................................................................... 0041-26

Figure 26. ........................................................................... 0041-27

HEAVY-DUTY WINCH OPERATION USING REMOTE-CONTROL

UNIT............................................................................................................. WP 0042

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Figure 1. ............................................................................. 0042-2

Figure 2. ............................................................................. 0042-3

Figure 3. ............................................................................. 0042-3

Figure 4. ............................................................................. 0042-4

Figure 5. ............................................................................. 0042-5

Figure 6. ............................................................................. 0042-6

Figure 7. ............................................................................. 0042-7

Figure 8. ............................................................................. 0042-8

Table 1. Heavy-Duty Winch Pull Capacity......................... 0042-9

Figure 9. ............................................................................. 0042-10

Figure 10. ........................................................................... 0042-12

Figure 11. ........................................................................... 0042-14

Figure 12. ........................................................................... 0042-15

Figure 13. ........................................................................... 0042-16

Figure 14. ........................................................................... 0042-17

CONNECT/DISCONNECT M870A3 SEMITRAILER.................................... WP 0043

Table 1. Lockout Requirements.......................................... 0043-2

Figure 1. ............................................................................. 0043-3

Figure 2. ............................................................................. 0043-4

Figure 3. ............................................................................. 0043-5

Figure 4. ............................................................................. 0043-6

Figure 5. ............................................................................. 0043-7

Figure 6. ............................................................................. 0043-8

Figure 7. ............................................................................. 0043-8

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Figure 8. ............................................................................. 0043-9

Figure 9. ............................................................................. 0043-10

Figure 10. ........................................................................... 0043-10

Figure 11. ........................................................................... 0043-11

Figure 12. ........................................................................... 0043-12

Figure 13. ........................................................................... 0043-12

Figure 14. ........................................................................... 0043-13

Figure 15. ........................................................................... 0043-14

Figure 16. ........................................................................... 0043-15

Figure 17. ........................................................................... 0043-16

Figure 18. ........................................................................... 0043-17

Figure 19. ........................................................................... 0043-18

Figure 20. ........................................................................... 0043-18

Figure 21. ........................................................................... 0043-19

Figure 22. ........................................................................... 0043-20

Figure 23. ........................................................................... 0043-21

START ENGINE........................................................................................... WP 0044

Figure 1. ............................................................................. 0044-2

Figure 2. ............................................................................. 0044-3

Figure 3. ............................................................................. 0044-4

Figure 4. ............................................................................. 0044-6

Figure 5. ............................................................................. 0044-7

OPERATE PARKING BRAKES.................................................................... WP 0045

Figure 1. ............................................................................. 0045-1

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OPERATE SERVICE BRAKES.................................................................... WP 0046

Figure 1. ............................................................................. 0046-2

OPERATE TRAILER BRAKES..................................................................... WP 0047

Figure 1. ............................................................................. 0047-2

OPERATE TRANSMISSION AND TRANSFER CASE................................ WP 0048

Figure 1. ............................................................................. 0048-2

Figure 2. ............................................................................. 0048-3

OPERATE ENGINE BRAKE........................................................................ WP 0049

Figure 1. ............................................................................. 0049-2

DRIVE VEHICLE FORWARD....................................................................... WP 0050

Figure 1. ............................................................................. 0050-2

DRIVE VEHICLE IN REVERSE................................................................... WP 0051

Figure 1. ............................................................................. 0051-2

DRIVE VEHICLE IN CITY TRAFFIC AND ON HIGHWAY........................... WP 0052

Figure 1. ............................................................................. 0052-2

Figure 2. ............................................................................. 0052-3

Figure 3. ............................................................................. 0052-4

DRIVE VEHICLE IN OFF-ROAD CONDITIONS.......................................... WP 0053

Figure 1. ............................................................................. 0053-1

DRIVE VEHICLE UP/DOWN STEEP GRADE............................................. WP 0054

Figure 1. ............................................................................. 0054-1

Figure 2. ............................................................................. 0054-2

DRIVE VEHICLE IN SLIPPERY CONDITIONS........................................... WP 0055

Figure 1. ............................................................................. 0055-2

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PARK VEHICLE........................................................................................... WP 0056

Figure 1. ............................................................................. 0056-1

SHUT OFF ENGINE..................................................................................... WP 0057

Figure 1. ............................................................................. 0057-1

OPERATE RIFLE STOWAGE MOUNT........................................................ WP 0058

Figure 1. ............................................................................. 0058-2

Figure 2. ............................................................................. 0058-3

PORTABLE WORK LAMP OPERATION..................................................... WP 0059

Figure 1. ............................................................................. 0059-1

Figure 2. ............................................................................. 0059-2

Figure 3. ............................................................................. 0059-3

OPERATE DOME LIGHT............................................................................. WP 0060

Figure 1. ............................................................................. 0060-2

OPERATE PANEL LIGHTS.......................................................................... WP 0061

Figure 1. ............................................................................. 0061-1

OPERATE PARKING LIGHTS..................................................................... WP 0062

Figure 1. ............................................................................. 0062-2

OPERATE SERVICE DRIVE LIGHTS.......................................................... WP 0063

Figure 1. ............................................................................. 0063-2

Figure 2. ............................................................................. 0063-2

Figure 3. ............................................................................. 0063-3

Figure 4. ............................................................................. 0063-4

OPERATE STOPLIGHTS............................................................................. WP 0064

Figure 1. ............................................................................. 0064-1

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OPERATE CLEARANCE LIGHTS............................................................... WP 0065

Figure 1. ............................................................................. 0065-2

OPERATE BLACKOUT DRIVE LIGHT........................................................ WP 0066

Figure 1. ............................................................................. 0066-2

OPERATE BLACKOUT MARKERS............................................................. WP 0067

Figure 1. ............................................................................. 0067-2

OPERATE WORK LIGHTS.......................................................................... WP 0068

Figure 1. ............................................................................. 0068-1

Figure 2. ............................................................................. 0068-2

Figure 3. ............................................................................. 0068-3

PORTABLE BEACON LIGHT OPERATION................................................ WP 0069

Figure 1. ............................................................................. 0069-1

Figure 2. ............................................................................. 0069-2

Figure 3. ............................................................................. 0069-2

Figure 4. ............................................................................. 0069-3

Figure 5. ............................................................................. 0069-4

OPERATE TURN SIGNALS......................................................................... WP 0070

Figure 1. ............................................................................. 0070-2

OPERATE EMERGENCY FLASHERS........................................................ WP 0071

Figure 1. ............................................................................. 0071-2

INSTALL/REMOVE WHEEL CHOCKS........................................................ WP 0072

Figure 1. ............................................................................. 0072-1

Figure 2. ............................................................................. 0072-2

CHANGE VEHICLE WEIGHT INDICATOR.................................................. WP 0073

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Figure 1. ............................................................................. 0073-1

OPERATE 24V BATTERY DISCONNECT SWITCH................................... WP 0074

Figure 1. ............................................................................. 0074-2

ADJUST AIR-RIDE SEAT............................................................................ WP 0075

Figure 1. ............................................................................. 0075-2

OPERATE FOUR-POINT SEATBELT.......................................................... WP 0076

Figure 1. ............................................................................. 0076-1

LIMP HOME/FLAT TIRE WITH NO SPARE................................................. WP 0077

Figure 1. ............................................................................. 0077-2

Figure 2. ............................................................................. 0077-3

Figure 3. ............................................................................. 0077-4

Figure 4. ............................................................................. 0077-5

Figure 5. ............................................................................. 0077-5

Figure 6. ............................................................................. 0077-6

Figure 7. ............................................................................. 0077-6

Figure 8. ............................................................................. 0077-7

Figure 9. ............................................................................. 0077-7

Figure 10. ........................................................................... 0077-8

Figure 11. ........................................................................... 0077-8

Figure 12. ........................................................................... 0077-9

Figure 13. ........................................................................... 0077-10

Figure 14. ........................................................................... 0077-11

Figure 15. ........................................................................... 0077-12

Figure 16. ........................................................................... 0077-13

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Figure 17. ........................................................................... 0077-14

Figure 18. ........................................................................... 0077-14

Figure 19. ........................................................................... 0077-15

Figure 20. ........................................................................... 0077-16

Figure 21. ........................................................................... 0077-16

Figure 22. ........................................................................... 0077-17

Figure 23. ........................................................................... 0077-17

Figure 24. ........................................................................... 0077-18

Figure 25. ........................................................................... 0077-19

Figure 26. ........................................................................... 0077-19

Figure 27. ........................................................................... 0077-20

Figure 28. ........................................................................... 0077-21

Figure 29. ........................................................................... 0077-21

Figure 30. ........................................................................... 0077-22

Figure 31. ........................................................................... 0077-23

Figure 32. ........................................................................... 0077-24

PERFORM IMMEDIATE ACTION FOR LOSS OF AIR SUPPLY

SYSTEM PRESSURE.................................................................................. WP 0078

Figure 1. ............................................................................. 0078-1

INSTALL/REMOVE TIRE CHAINS............................................................... WP 0079

Figure 1. ............................................................................. 0079-2

Figure 2. ............................................................................. 0079-2

Figure 3. ............................................................................. 0079-3

Figure 4. ............................................................................. 0079-4

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Figure 5. ............................................................................. 0079-5

Figure 6. ............................................................................. 0079-5

Figure 7. ............................................................................. 0079-6

Figure 8. ............................................................................. 0079-6

FORD WATER OBSTACLE......................................................................... WP 0080

Figure 1. ............................................................................. 0080-2

INTERIM NUCLEAR, BIOLOGICAL, AND CHEMICAL (NBC)

DECONTAMINATION PROCEDURES........................................................ WP 0081

OPERATE TIRE CARRIER USING HAND PUMP....................................... WP 0082

Figure 1. ............................................................................. 0082-2

Figure 2. ............................................................................. 0082-3

Figure 3. ............................................................................. 0082-3

Figure 4. ............................................................................. 0082-4

Figure 5. ............................................................................. 0082-5

Figure 6. ............................................................................. 0082-6

Figure 7. ............................................................................. 0082-7

Figure 8. ............................................................................. 0082-8

Figure 9. ............................................................................. 0082-9

Figure 10. ........................................................................... 0082-10

Figure 11. ........................................................................... 0082-11

Figure 12. ........................................................................... 0082-12

Figure 13. ........................................................................... 0082-13

Figure 14. ........................................................................... 0082-14

Figure 15. ........................................................................... 0082-15

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Figure 16. ........................................................................... 0082-16

OPERATE TIRE CARRIER USING OUTSIDE AIR SOURCE..................... WP 0083

Figure 1. ............................................................................. 0083-2

Figure 2. ............................................................................. 0083-3

Figure 3. ............................................................................. 0083-3

Figure 4. ............................................................................. 0083-4

Figure 5. ............................................................................. 0083-5

Figure 6. ............................................................................. 0083-7

Figure 7. ............................................................................. 0083-8

Figure 8. ............................................................................. 0083-9

Figure 9. ............................................................................. 0083-10

Figure 10. ........................................................................... 0083-12

Figure 11. ........................................................................... 0083-12

Figure 12. ........................................................................... 0083-13

Figure 13. ........................................................................... 0083-14

Figure 14. ........................................................................... 0083-15

Figure 15. ........................................................................... 0083-16

Figure 16. ........................................................................... 0083-17

SELF-RECOVER VEHICLE USING SELF-RECOVERY WINCH................ WP 0084

Figure 1. ............................................................................. 0084-1

Figure 2. ............................................................................. 0084-2

Figure 3. ............................................................................. 0084-3

Figure 4. ............................................................................. 0084-4

Figure 5. ............................................................................. 0084-5

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Figure 6. ............................................................................. 0084-6

Table 1. Self-Recovery Winch Pull Capacity....................... 0084-7

Figure 7. ............................................................................. 0084-10

Figure 8. ............................................................................. 0084-11

Figure 9. ............................................................................. 0084-12

Figure 10. ........................................................................... 0084-13

Figure 11. ........................................................................... 0084-13

SNATCH BLOCK INSTALLATION/REMOVAL............................................ WP 0085

Figure 1. ............................................................................. 0085-1

Figure 2. ............................................................................. 0085-2

CONNECT/DISCONNECT SELF-RECOVERY WINCH CABLE TO

ANOTHER VEHICLE.................................................................................... WP 0086

Figure 1. ............................................................................. 0086-1

Figure 2. ............................................................................. 0086-2

Figure 3. ............................................................................. 0086-3

Figure 4. ............................................................................. 0086-4

TOW DISABLED VEHICLE.......................................................................... WP 0087

Figure 1. ............................................................................. 0087-2

CONNECT/DISCONNECT TOW BAR......................................................... WP 0088

Figure 1. ............................................................................. 0088-2

Figure 2. ............................................................................. 0088-3

Figure 3. ............................................................................. 0088-3

Figure 4. ............................................................................. 0088-5

Figure 5. ............................................................................. 0088-6

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Figure 6. ............................................................................. 0088-7

Figure 7. ............................................................................. 0088-8

Figure 8. ............................................................................. 0088-9

Figure 9. ............................................................................. 0088-10

Figure 10. ........................................................................... 0088-10

Figure 11. ........................................................................... 0088-11

Figure 12. ........................................................................... 0088-12

Figure 13. ........................................................................... 0088-13

Figure 14. ........................................................................... 0088-14

Figure 15. ........................................................................... 0088-15

Figure 16. ........................................................................... 0088-15

OPERATE VEHICLE IN EXTREME HEAT.................................................. WP 0089

Figure 1. ............................................................................. 0089-2

OPERATION IN EXTREME DUST............................................................... WP 0090

Figure 1. ............................................................................. 0090-1

Figure 2. ............................................................................. 0090-2

OPERATE VEHICLE IN SAND OR MUD..................................................... WP 0091

Figure 1. ............................................................................. 0091-2

OPERATE VEHICLE IN DESERT ENVIRONMENT.................................... WP 0092

OPERATE VEHICLE IN COLD ENVIRONMENT (32°F [0°C] to -25°F

[-32°C])......................................................................................................... WP 0093

Figure 1. ............................................................................. 0093-2

OPERATION IN EXTREME COLD ENVIRONMENT................................... WP 0094

OPERATE VEHICLE IN FOREST OR ROCKY TERRAIN........................... WP 0095

xxiii
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Page No.

OPERATE VEHICLE IN SALTWATER AREAS........................................... WP 0096

SET UP/SECURE HIGHWAY EMERGENCY MARKER KIT....................... WP 0097

Figure 1. ............................................................................. 0097-1

Figure 2. ............................................................................. 0097-2

Figure 3. ............................................................................. 0097-2

Figure 4. ............................................................................. 0097-2

Figure 5. ............................................................................. 0097-3

Figure 6. ............................................................................. 0097-3

Figure 7. ............................................................................. 0097-4

Figure 8. ............................................................................. 0097-4

Figure 9. ............................................................................. 0097-5

Figure 10. ........................................................................... 0097-5

Figure 11. ........................................................................... 0097-6

MANUALLY RELEASE SPRING BRAKES.................................................. WP 0098

Figure 1. ............................................................................. 0098-1

Figure 2. ............................................................................. 0098-2

Figure 3. ............................................................................. 0098-3

Figure 4. ............................................................................. 0098-4

Figure 5. ............................................................................. 0098-4

SLAVE START VEHICLE............................................................................. WP 0099

Figure 1. ............................................................................. 0099-2

Figure 2. ............................................................................. 0099-2

Figure 3. ............................................................................. 0099-3

Figure 4. ............................................................................. 0099-4

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WP Sequence No.
Page No.

Figure 5. ............................................................................. 0099-4

Figure 6. ............................................................................. 0099-5

Figure 7. ............................................................................. 0099-7

Figure 8. ............................................................................. 0099-7

Figure 9. ............................................................................. 0099-8

PERFORM IMMEDIATE ACTION FOR LOSS OF HYDRAULIC

SYSTEM....................................................................................................... WP 0100

LIMP HOME/TRANSMISSION FAULT......................................................... WP 0101

Figure 1. ............................................................................. 0101-2

STOWAGE AND SIGN GUIDE.................................................................... WP 0102

Table 1. Inside Driver Side Door......................................... 0102-1

Table 2. Front Exterior........................................................ 0102-2

Table 3. M983A4 LET Tractor Cabin.................................. 0102-3

Table 4. M983A4 LET Tractor Driver Side Exterior............. 0102-4

Table 5. M983A4 LET Tractor Passenger Side Exterior..... 0102-5

Table 6. M983A4 LET Tractor Rear Exterior....................... 0102-6

Table 7. M983A4 LET Miscellaneous Decals/

Placards/Plates/Stencils....................................................... 0102-6

Chapter 3 - Troubleshooting Procedures

BUZZER SOUNDS AND AIR INDICATOR IS LIT........................................ WP 0103

Figure 1. ............................................................................. 0103-2

Figure 2. ............................................................................. 0103-3

Figure 3. ............................................................................. 0103-4

Figure 4. ............................................................................. 0103-5

Figure 5. ............................................................................. 0103-6

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Page No.

Figure 6. ............................................................................. 0103-7

AIR SYSTEM LOSES PRESSURE DURING OPERATION......................... WP 0104

Figure 1. ............................................................................. 0104-2

Figure 2. ............................................................................. 0104-3

Figure 3. ............................................................................. 0104-4

Figure 4. ............................................................................. 0104-5

Figure 5. ............................................................................. 0104-6

TRAILER BRAKE DOES NOT APPLY WHEN SERVICE BRAKE

TREADLE OR PARKING BRAKE IS USED................................................. WP 0105

Figure 1. ............................................................................. 0105-2

Figure 2. ............................................................................. 0105-3

WINDSHIELD WASHER WILL NOT OPERATE.......................................... WP 0106

Figure 1. ............................................................................. 0106-1

Figure 2. ............................................................................. 0106-2

Figure 3. ............................................................................. 0106-3

Figure 4. ............................................................................. 0106-4

Figure 5. ............................................................................. 0106-4

Figure 6. ............................................................................. 0106-5

AIR HORN WILL NOT OPERATE................................................................ WP 0107

Figure 1. ............................................................................. 0107-2

Figure 2. ............................................................................. 0107-3

Figure 3. ............................................................................. 0107-4

ARCTIC ENGINE HEATER FAILS TO OPERATE....................................... WP 0108

Figure 1. ............................................................................. 0108-2

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WP Sequence No.
Page No.

Figure 2. ............................................................................. 0108-4

ONE OR MORE LIGHTING CIRCUITS NOT OPERATING......................... WP 0109

Figure 1. ............................................................................. 0109-2

Figure 2. ............................................................................. 0109-3

FAILS TO CRANK WHEN ENGINE START SWITCH IS TURNED TO

START POSITION........................................................................................ WP 0110

Figure 1. ............................................................................. 0110-1

Figure 2. ............................................................................. 0110-2

CRANKS BUT FAILS TO START................................................................. WP 0111

Figure 1. ............................................................................. 0111-1

Figure 2. ............................................................................. 0111-2

Figure 3. ............................................................................. 0111-3

STARTS OR RUNS ROUGHLY AFTER PROPER WARM-UP, DOES

NOT MAKE FULL POWER, OR MAKES EXCESSIVE EXHAUST
SMOKE......................................................................................................... WP 0112

Figure 1. ............................................................................. 0112-2

Figure 2. ............................................................................. 0112-3

Figure 3. ............................................................................. 0112-4

ENGINE OVERHEATS................................................................................. WP 0113

Figure 1. ............................................................................. 0113-2

Figure 2. ............................................................................. 0113-3

LOW OIL PRESSURE GAUGE INDICATION.............................................. WP 0114

Figure 1. ............................................................................. 0114-1

EXCESSIVE OIL CONSUMPTION.............................................................. WP 0115

Figure 1. ............................................................................. 0115-2

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WP Sequence No.
Page No.

HYDRAULIC SYSTEM OPERATES TOO SLOW, TOO FAST, WITH

JERKY MOVEMENTS; OR ONE OR MORE HYDRAULICS CIRCUITS
WILL NOT OPERATE.................................................................................. WP 0116

Figure 1. ............................................................................. 0116-2

Figure 2. ............................................................................. 0116-4

SELF-RECOVERY WINCH DOES NOT WORK.......................................... WP 0117

Figure 1. ............................................................................. 0117-2

Figure 2. ............................................................................. 0117-3

UNUSUALLY NOISY WHEN OPERATING.................................................. WP 0118

Figure 1. ............................................................................. 0118-1

Figure 2. ............................................................................. 0118-2

VEHICLE IS HARD TO STEER, SHIMMIES, WANDERS, OR PULLS

TO ONE SIDE.............................................................................................. WP 0119

Figure 1. ............................................................................. 0119-2

Figure 2. ............................................................................. 0119-3

VEHICLE STEERING SLOW TO RESPOND OR INTERMITTENT............. WP 0120

Figure 1. ............................................................................. 0120-2

Figure 2. ............................................................................. 0120-4

UNUSUALLY NOISY WHEN OPERATING.................................................. WP 0121

Figure 1. ............................................................................. 0121-1

SLOW OR DIFFICULT ENGAGEMENT....................................................... WP 0122

Figure 1. ............................................................................. 0122-1

TRANSFER CASE SHIFT LEVER WILL NOT SHIFT.................................. WP 0123

Figure 1. ............................................................................. 0123-1

Figure 2. ............................................................................. 0123-2

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WP Sequence No.
Page No.

Figure 3. ............................................................................. 0123-3

Figure 4. ............................................................................. 0123-4

TRANS TEMP GAUGE INDICATES OVERHEATING DURING

NORMAL OPERATION................................................................................ WP 0124

Figure 1. ............................................................................. 0124-1

Figure 2. ............................................................................. 0124-2

WHEEL WOBBLES...................................................................................... WP 0125

Figure 1. ............................................................................. 0125-2

Figure 2. ............................................................................. 0125-3

TIRES WORN UNEVENLY OR EXCESSIVELY.......................................... WP 0126

Figure 1. ............................................................................. 0126-2

Chapter 4 - Preventive Maintenance Checks and Services (PMCS)

INTRODUCTION - PREVENTIVE MAINTENANCE .................................... WP 0127

Figure 1. ............................................................................. 0127-3

BEFORE - PREVENTIVE MAINTENANCE.................................................. WP 0128

Table 1. PMCS - BEFORE.................................................. 0128-1

Figure 1. ............................................................................. 0128-4

Figure 2. ............................................................................. 0128-5

Figure 3. ............................................................................. 0128-8

Figure 4. ............................................................................. 0128-9

Figure 5. ............................................................................. 0128-10

Figure 6. ............................................................................. 0128-11

Figure 7. ............................................................................. 0128-12

Figure 8. ............................................................................. 0128-14

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Page No.

Figure 9. ............................................................................. 0128-18

Figure 10. ........................................................................... 0128-19

Figure 11. ........................................................................... 0128-21

Figure 12. ........................................................................... 0128-22

Figure 13. ........................................................................... 0128-24

Figure 14. ........................................................................... 0128-28

Figure 15. ........................................................................... 0128-31

Figure 16. ........................................................................... 0128-33

Figure 17. ........................................................................... 0128-35

Figure 18. ........................................................................... 0128-36

Figure 19. ........................................................................... 0128-37

DURING - PREVENTIVE MAINTENANCE.................................................. WP 0129

Table 1. PMCS - DURING.................................................. 0129-1

Figure 1. ............................................................................. 0129-2

Figure 2. ............................................................................. 0129-5

Figure 3. ............................................................................. 0129-7

Figure 4. ............................................................................. 0129-10

AFTER - PREVENTIVE MAINTENANCE .................................................... WP 0130

Table 1. PMCS - AFTER..................................................... 0130-1

Figure 1. ............................................................................. 0130-5

Figure 2. ............................................................................. 0130-8

Figure 3. ............................................................................. 0130-9

Figure 4. ............................................................................. 0130-11

Figure 5. ............................................................................. 0130-12

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WP Sequence No.
Page No.

Figure 6. ............................................................................. 0130-13

Figure 7. ............................................................................. 0130-14

Figure 8. ............................................................................. 0130-15

Figure 9. ............................................................................. 0130-16

Figure 10. ........................................................................... 0130-17

Figure 11. ........................................................................... 0130-18

Figure 12. ........................................................................... 0130-21

Figure 13. ........................................................................... 0130-22

WEEKLY - PREVENTIVE MAINTENANCE................................................. WP 0131

Table 1. PMCS - WEEKLY.................................................. 0131-1

Figure 1. ............................................................................. 0131-4

Figure 2. ............................................................................. 0131-6

Figure 3. ............................................................................. 0131-7

Figure 4. ............................................................................. 0131-8

Figure 5. ............................................................................. 0131-9

Figure 6. ............................................................................. 0131-10

Figure 7. ............................................................................. 0131-11

Figure 8. ............................................................................. 0131-12

Figure 9. ............................................................................. 0131-13

Figure 10. ........................................................................... 0131-15

Figure 11. ........................................................................... 0131-16

Figure 12. ........................................................................... 0131-18

Figure 13. ........................................................................... 0131-20

Figure 14. ........................................................................... 0131-23

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Page No.

Figure 15. ........................................................................... 0131-24

Figure 16. ........................................................................... 0131-25

Figure 17. ........................................................................... 0131-27

Figure 18. ........................................................................... 0131-29

Figure 19. ........................................................................... 0131-30

Figure 20. ........................................................................... 0131-32

Figure 21. ........................................................................... 0131-34

Figure 22. ........................................................................... 0131-35

Figure 23. ........................................................................... 0131-36

SEMIANNUAL - PREVENTIVE MAINTENANCE......................................... WP 0132

Table 1. PMCS- SEMIANNUAL.......................................... 0132-1

Figure 1. ............................................................................. 0132-3

Figure 2. ............................................................................. 0132-6

Figure 3. ............................................................................. 0132-8

Figure 4. ............................................................................. 0132-9

Figure 5. ............................................................................. 0132-10

Figure 6. ............................................................................. 0132-11

Figure 7. ............................................................................. 0132-11

Figure 8. ............................................................................. 0132-12

Figure 9. ............................................................................. 0132-13

Figure 10. ........................................................................... 0132-14

Figure 11. ........................................................................... 0132-15

Figure 12. ........................................................................... 0132-16

MONTHLY - PREVENTIVE MAINTENANCE............................................... WP 0133

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WP Sequence No.
Page No.

Table 1. PMCS - MONTHLY............................................... 0133-1

Figure 1. ............................................................................. 0133-4

Figure 2. ............................................................................. 0133-5

Figure 3. ............................................................................. 0133-6

Figure 4. ............................................................................. 0133-7

Figure 5. ............................................................................. 0133-8

Figure 6. ............................................................................. 0133-9

Chapter 5 - Maintenance Instructions

LUBRICATION INSTRUCTIONS................................................................. WP 0134

Table 1. Engine Lubrication................................................ 0134-2

Table 2. Transmission and Transfer Case Lubrication....... 0134-3

Table 3. Axle Lubrication..................................................... 0134-4

Table 4. Hydraulic Reservoir Servicing............................... 0134-7

Table 5. Radiator Servicing................................................. 0134-8

Table 6. Tire Carrier Lubrication......................................... 0134-10

Table 7. Heavy-Duty Winch Lubrication.............................. 0134-10

Table 8. Oil Can Point Lubrication...................................... 0134-11

Table 9. Miscellaneous Lubrication Points.......................... 0134-12

Table 10. Vehicle Cleaning................................................. 0134-13

CLOSE/OPEN HEATER VALVES............................................................... WP 0135

Figure 1. ............................................................................. 0135-1

Figure 2. ............................................................................. 0135-2

Figure 3. ............................................................................. 0135-3

Figure 4. ............................................................................. 0135-3

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PRE/POST TOWING PROCEDURE (FRONT LIFT ONLY)......................... WP 0136

Figure 1. ............................................................................. 0136-2

Figure 2. ............................................................................. 0136-3

Figure 3. ............................................................................. 0136-4

Figure 4. ............................................................................. 0136-5

CLEAN VEHICLE......................................................................................... WP 0137

Figure 1. ............................................................................. 0137-1

Figure 2. ............................................................................. 0137-2

CHANGE WHEEL AND TIRE ASSEMBLY.................................................. WP 0138

Figure 1. ............................................................................. 0138-2

Figure 2. ............................................................................. 0138-3

Figure 3. ............................................................................. 0138-4

Figure 4. ............................................................................. 0138-5

Figure 5. ............................................................................. 0138-6

Figure 6. ............................................................................. 0138-6

Figure 7. ............................................................................. 0138-7

Figure 8. ............................................................................. 0138-8

Figure 9. ............................................................................. 0138-9

Figure 10. ........................................................................... 0138-10

Figure 11. ........................................................................... 0138-11

Figure 12. ........................................................................... 0138-11

Figure 13. ........................................................................... 0138-13

Figure 14. ........................................................................... 0138-13

Figure 15. ........................................................................... 0138-15

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Page No.

Figure 16. ........................................................................... 0138-15

Figure 17. ........................................................................... 0138-16

Figure 18. ........................................................................... 0138-17

CLEAN FUEL TANK STRAINER.................................................................. WP 0139

Figure 1. ............................................................................. 0139-1

Figure 2. ............................................................................. 0139-2

SERVICE AIR CLEANER ELEMENT........................................................... WP 0140

Figure 1. ............................................................................. 0140-1

Figure 2. ............................................................................. 0140-2

Figure 3. ............................................................................. 0140-3

Figure 4. ............................................................................. 0140-4

Figure 5. ............................................................................. 0140-4

Figure 6. ............................................................................. 0140-5

SERVICE TIRES.......................................................................................... WP 0141

Figure 1. ............................................................................. 0141-3

Figure 2. ............................................................................. 0141-4

Figure 3. ............................................................................. 0141-5

Figure 4. ............................................................................. 0141-6

Figure 5. ............................................................................. 0141-7

OPEN/CLOSE BATTERY BOX.................................................................... WP 0142

Figure 1. ............................................................................. 0142-3

Figure 2. ............................................................................. 0142-5

OPEN/CLOSE ENGINE COVERS AND ENGINE SIDE PANEL

REMOVAL/INSTALLATION......................................................................... WP 0143

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Figure 1. ............................................................................. 0143-1

Figure 2. ............................................................................. 0143-2

Figure 3. ............................................................................. 0143-3

Figure 4. ............................................................................. 0143-4

Figure 5. ............................................................................. 0143-5

Figure 6. ............................................................................. 0143-5

Figure 7. ............................................................................. 0143-6

Figure 8. ............................................................................. 0143-7

PRIMING FUEL SYSTEM............................................................................ WP 0144

Figure 1. ............................................................................. 0144-2

OPEN/CLOSE CIRCUIT BREAKER ACCESS PANEL................................ WP 0145

Figure 1. ............................................................................. 0145-1

Figure 2. ............................................................................. 0145-2

Chapter 6 - Supporting Information

REFERENCES............................................................................................. WP 0146

COMPONENTS OF END ITEM AND BASIC ISSUE ITEMS LISTS............ WP 0147

Table 1. List of Usable On Codes....................................... 0147-2

Table 2. Components of End Item...................................... 0147-2

Table 3. Basic Issue Items.................................................. 0147-3

ADDITIONAL AUTHORIZATION LIST (AAL)............................................... WP 0148

Table 1. List of Usable On Codes....................................... 0148-1

Table 2. Additional Authorization List.................................. 0148-2

EXPENDABLE AND DURABLE ITEMS LIST.............................................. WP 0149

Table 1. Expendable and Durable Items List...................... 0149-1

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 TM 9-2320-341-10

HOW TO USE THIS MANUAL

USABLE ON CODE (UOC) INFORMATION

Usable On Code (UOC) - the user should be aware that the M983A4 LET Tractor HEMTT
series vehicle (without self-recovery winch installed) UOC is “L14”. Dependent on the format
used for printing this manual, the user may or may not see instructions printed in this manual
stating what information is applicable to which model HEMTT series vehicle by UOC.

WARNINGS, CAUTIONS, AND NOTES

Read all WARNINGS, CAUTIONS, AND NOTES before performing any procedure.
Warnings, cautions, notes, subject headings, and other essential information are printed in
BOLD type, making them easier for the user to see.

GENERAL INFORMATION

This manual is designed to help operate and maintain the Heavy Expanded Mobility Tactical
Truck (HEMTT). Listed below are some features included in this manual to help locate and
use the required information:
• Chapter 1 of this manual includes HEMTT series vehicle general information, theory
of operation, differences between models, etc.
• Chapter 2 of this manual provides operating procedures and operator Preventive
Maintenance Checks and Services (PMCS) for both the HEMTT series vehicle, and
its accompanying operating systems.
• Chapter 3 of this manual provides operator troubleshooting procedures for both the
HEMTT series vehicle, and its accompanying operating systems.
In addition to text, there are illustrations showing:
1. Components, controls, and indicators.
2. How to take a component off, and put it back on.
3. Cleaning and inspection criteria are also listed when necessary.

xxxvii
TM 9-2320-341-10

CHAPTER 1

GENERAL
INFORMATION,
EQUIPMENT
DESCRIPTION AND
THEORY OF
OPERATION
 TM 9-2320-341-10 0001

OPERATOR MAINTENANCE
INTRODUCTION

SCOPE

This manual is used for operation and operator-performed maintenance of HEMTT series
vehicles which consist of a number of different models all built on similar chassis, but
specially equipped to perform different missions.

Table 1. Overview.

M983A4 LET TRACTOR DESCRIPTION

Tractor vehicle with 86,000 lbs (39 044 kg) GVWR and
151,000 lbs (68 554 kg) GCWR. Vehicle is equipped with
fifth wheel, 3.5 in. (8.9 cm) kingpin, and 45,000 lbs (20 430
kg) recovery winch.

Figure 1.

MAINTENANCE FORMS AND RECORDS

Department of the Army forms and procedures used for equipment maintenance will be
those prescribed by DA PAM 750-8 The Army Maintenance Management System (TAMMS)
Users Manual. (WP 0146)

EQUIPMENT IMPROVEMENT REPORT AND MAINTENANCE DIGEST (EIR MD) AND

QUALITY DEFICIENCY REPORTING (QDR).

The quarterly TB 43-0001-62 (series) Equipment Improvement Report and Maintenance

Digest (WP 0146) contains valuable field information on equipment covered in this manual.
Information in the TB 43-0001-62 (series) Equipment Improvement Report and
Maintenance Digest (WP 0146) is compiled from some of the Equipment Improvement
Reports (EIR) that have been prepared on vehicles covered in this manual. Many of these
articles result from comments, suggestions, and improvement recommendations that were
submitted to the EIR program. TB 43-0001-62 (series) Equipment Improvement Report and
Maintenance Digest (WP 0146) contains information on equipment improvements, minor
alterations, proposed Modification Work Orders (MWOs), warranties (if applicable), actions

0001-1
 TM 9-2320-341-10 0001

taken on some of the DA Form 2028's (WP 0146) (Recommended Changes to

Publications), and advance information on proposed changes that may affect this manual.
Refer to the TB 43-0001-62 (series) Equipment Improvement Report and Maintenance
Digest (WP 0146) periodically for the most current and authoritative information on the
equipment. The information will help to do a better job and will advise of the latest changes
to this manual. Also refer to DA PAM 25-30, (WP 0146) Consolidated Index of Army
Publications and Blank Forms at http://www.army.mil/usapa/2530.html, and reference
section (WP 0146) of this manual. If you have a change recommendation to this manual,
submit a DA Form 2028's (WP 0146) (Recommended Changes to Publications) via e-mail
to: ROCK-TACOM-TECH-PUBS@conus.army.mil.
You can help improve this publication. If you find any mistakes or if you know of a way to
improve the procedures, please let us know. Submit your DA Form 2028 (WP 0146)
(Recommended Changes to Equipment Technical Publications) through the Internet, on
the Army Electronic Product Support (AEPS) website. The Internet address is https://
aeps.ria.army.mil. The DA Form 2028 (WP 0146) is located under the Public Applications
section in the AEPS Public Home Page. Fill out the form and click on SUBMIT. Using this
form on the AEPS will enable us to respond quicker to your comments and better manage
the DA Form 2028 program. You may also mail, fax or e-mail your letter or DA Form 2028
(WP 0146) direct to: TACOM Life Cycle Management Command, ATTN: AMSTA-LC-
LMPP / TECH PUBS, TACOM–RI, 1 Rock Island Arsenal, Rock Island, IL 61299-7630. The
e-mail address is ROCK-TACOM-TECH-PUBS@conus.army.mil. The fax number is DSN
793-0726 or Commercial (309) 782-0726.

HAND RECEIPT (HR) INFORMATION

The is a companion document to this manual which consists of preprinted hand receipts
(DA Form 2062) (WP 0146) that list end item related equipment (COEI, BII, (WP 0147) and
AAL (WP 0148)) which must be accounted for. As an aid to property accountability,
additional Hand Receipt (-HR) Manuals may be requisitioned from the following source in
accordance with procedures in DA PAM 25-30, (WP 0146) Consolidated Index of Army
Publications and Blank Forms; Commander US Army Distribution Operation Facility, 1655
Woodson Road, St Louis, MO 63114-6181.

CORROSION PREVENTION AND CONTROL

Corrosion prevention and control (CPC) of Army material is a continuing concern. It is

important that any corrosion problems be reported so they can be corrected and
improvements can be made to prevent problems in the future. While corrosion is typically
associated with the rusting of metals, it can also include deterioration of other materials,
such as rubber and plastic. Unusual cracking, softening, swelling, or breaking of these
materials may be a corrosion problem.
If a corrosion problem is identified, it can be reported using SF 368 (WP 0146). The use of
key words, such as “corrosion”, “rust”, “deterioration”, and “cracking” will ensure that the
information is identified as a CPC problem.

0001-2
 TM 9-2320-341-10 0001

DESTRUCTION OF ARMY MATERIEL TO PREVENT ENEMY USE

Procedures for the destruction of Army materiel to prevent enemy use are contained in TM
750-244-6 (WP 0146).

PREPARATION FOR STORAGE OR SHIPMENT

See information on preparing the HEMTT series vehicle for storage or shipment.

WARRANTY INFORMATION

The HEMTT series vehicles are warranted by Oshkosh Truck Corporation for 12 months or
12,000 miles (19 308 km), whichever comes first. The warranty starts on the date found in
block 23 of DA Form 2408-9 (WP 0146) in the vehicle logbook. Report all defects in material
or workmanship to the supervisor, who will take appropriate action through the field level
maintenance shop.

NOMENCLATURE CROSS-REFERENCE LIST

Table 2. Common Nomenclature.

COMMON NAME OFFICIAL NOMENCLATURE

Brake Pedal Service Brake Pedal

Cable/Hoist Cable Wire Rope

Cold Start System Ether Quick-Start System

Electrical Control Box Junction Box

Engine Coolant Antifreeze, Ethylene Glycol Mixture

Glad Hand Quick Disconnect Coupling

High Idle Switch Engine Speed Control Switch

Jake Brake, Jacobs® Brake Engine Retarder, Engine Brake

Manual Controls Directional Control Valves

O-Ring Preformed Packing

Snap Ring Retaining Ring

0001-3
 TM 9-2320-341-10 0001

LIST OF ABBREVIATIONS

Table 3. Common Abbreviations.

ABBREVIATION OFFICIAL NOMENCLATURE

AAL Additional Authorization List

AMDF Army Master Data File

amp Ampere

BAP Bridge Adapter Pallet

bar Barometric Pressure

BII Basic Issue Items

BL Bottom Load

BOI Basis of Issue

C Celsius

CAGEC Commercial And Government Entity/Code

CARC Chemical Agent Resistant Coating

CBR Chemical, Biological, Radiological

CBT Common Bridge Transporter

CCA Cold Cranking Amperes

CHU Container Handling Unit

CID Cubic Inch Displacement

CKT Circuit

cm Centimeter

COEI Components of End Item

CPC Corrosion Prevention Control

0001-4
 TM 9-2320-341-10 0001

Table 3. Common Abbreviations. - Continued

ABBREVIATION OFFICIAL NOMENCLATURE

CROP Container Roll-In/Out Platform

CTA Common Table of Allowance

DA Department of the Army

dia. Diameter

DS Direct Support

EIR Equipment Improvement Recommendations

F Fahrenheit

FHTV Family of Heavy Tactical Vehicles

FLA Front Lift Adapter

fl. oz. Fluid Ounce

FR Flatrack

FRS Forward Repair System

ft. Foot

GAA Grease, Automotive, and Artillery

gal Gallon

GCWR Gross Combination Weight Rating

GMT Guided Missile Transport

GPFU Gas Particulate Filter Unit

gpm Gallons Per Minute

GS General Support

GVWR Gross Vehicle Weight Rating

0001-5
 TM 9-2320-341-10 0001

Table 3. Common Abbreviations. - Continued

ABBREVIATION OFFICIAL NOMENCLATURE

HDI Hexamethylene Diisocyanate

HEMTT Heavy Expanded Mobility Tactical Truck

hp Horsepower

HVAC Heating, Ventilation, and Air Conditioning

IBC Improved Boat Cradle

I.D. Inside Diameter

in. Inch

ISO International Standards Organization

JTA Joint Table of Allowances

kg Kilogram

km Kilometer

Kmh or km/h Kilometer per Hour

kPa Kilopascals

kw Kilowatt

L Liter

lbs Pound

lb-ft Pound-Foot

lb-in Pound-Inch

LCD Liquid Crystal Display

LED Light Emitting Diode

LH Left-Hand

0001-6
 TM 9-2320-341-10 0001

Table 3. Common Abbreviations. - Continued

ABBREVIATION OFFICIAL NOMENCLATURE

LHS Load Handling System

M Meter

MAC Maintenance Allocation Chart

mi Mile

ml Milliliter

MLC Military Load Class

mm Millimeter

Mph Miles Per Hour

MTOE Modified Tables of Organization and Equipment

NBC Nuclear, Biological, Chemical

NIIN National Item Identification Number

Nm Newton Meter

NOC Not Usable-On Code

NSN National Stock Number

O.D. Outside Diameter

OEA Oil, Engine, Arctic

OE/HDO Oil, Engine/Hydraulic Oil

O/R Outrigger

OTC Oshkosh Truck Corporation

Oz Ounce

PLS Palletized Load System

0001-7
 TM 9-2320-341-10 0001

Table 3. Common Abbreviations. - Continued

ABBREVIATION OFFICIAL NOMENCLATURE

PMCS Preventive Maintenance Checks and Services

psi Pounds per Square Inch

pt. Pint

PTO Power Take-Off

qt. Quart

Qty. Recm. Quantity Recommended

Qty. Rqr. Quantity Required

RCU Remote Control Unit

RFI Radio-Frequency Interference

RH Right-Hand

rpm Revolutions Per Minute

RPSTL Repair Parts and Special Tools List

SAE Society of Automotive Engineers

SMR Source, Maintenance, and Recoverability

SRA Specialized Repair Activity

SRW Self-Recovery Winch

TAMMS The Army Maintenance Management System

TDA Tables of Distribution and Allowance

TM Technical Manual

TMDE Test, Measuring, and Diagnostic Equipment

TOE Tables of Organization and Equipment

0001-8
 TM 9-2320-341-10 0001

Table 3. Common Abbreviations. - Continued

ABBREVIATION OFFICIAL NOMENCLATURE

u/m Unit of Measure

UOC Usable-On Code

Vdc Volts Direct Current

XHD Extra Heavy-Duty

SAFETY, CARE, AND HANDLING

Significant hazards and safety recommendations are listed in the table below.

Table 4. Significant Hazard And Safety Recommendations.

SAFETY
HAZARD RECOMMENDATIO OPERATING CONDITION
N OR PRECAUTION

Low air pressure for brakes. Do not drive vehicle Abnormal

while low air pressure
warning buzzer is
sounding or red light
is on.

Connecting towing devices. Do not go between Normal

vehicles until vehi-
cles are stopped and
brakes are set.

Refueling vehicle. Shut off engine and Normal

no smoking when fill-
ing tank.

NOTE
Category of hazards as to whether or not they may be expected under
normal or abnormal operating conditions.

0001-9
 TM 9-2320-341-10 0001

METRIC SYSTEM

The equipment described herein contains metric components and requires metric, common,
and special tools. Therefore, metric units and English units will be used throughout this
publication. An English-to-metric conversion table is included as the last page of this manual
inside the back cover.

END OF WORK PACKAGE

0001-10
 TM 9-2320-341-10 0002

OPERATOR MAINTENANCE
WARRANTY PROGRAM

GENERAL

This work package provides implementation instructions for the warranty on the HEMTT. It
contains instructions for obtaining services and/or supplies covered under warranty. This
work package also describes methods of processing warranty claims. For additional
warranty information on the HEMTT or any U.S. Army Tank-Automotive and Armaments
Command (TACOM) equipment, contact your local Warranty Control Office/Officer
(WARCO) or TACOM Logistics Assistance Representative (LAR). If your WARCO or
TACOM LAR is not available or if additional information is required, contact TACOM.

EXPLANATION OF TERMS

Abuse
The improper use, maintenance, repair or handling of warranted items that may cause the
warranty of those items to become void (for example, not following service intervals, using
the vehicle for other than what is intended).

Acceptance
The execution of the acceptance block and signing of DD Form 250 (WP 0146), by the
authorized Government representative, unless end items are placed in storage in which
case acceptance shall mean date of shipment from storage facility as reflected on DD Form
1149 (WP 0146) or DD Form 1348-1. (WP 0146)

Acceptance Date
The date an item of equipment is accepted into the Army's inventory by the execution of
the acceptance block and signing of a DD Form 250 (WP 0146) or approved acceptance
document, by an authorized representative of the Government.

Contractor
The supplier of equipment who enters into an agreement directly with the Government to
furnish supplies.

Correction
The elimination of a defect.

0002-1
 TM 9-2320-341-10 0002

Defect
Any condition or characteristic in any supplies furnished by the contractor that does not
otherwise function or threatens not to function as intended.

Failure
A part, component, or end item that fails to perform its intended use.

Manufacturer's Recall

Safety Recall An item is recalled to repair or replace a defective part or assembly which
may affect safety.

Service Recall An item is recalled to repair or replace a defective part(s) or assembly which
does not affect the safe use of this item.

Owning Unit
The Army Unit authorized to operate, maintain, and use the equipment.

Reimbursement
A written provision in this warranty in which the Using/Support Unit may make the necessary
repairs, with or without prior approval from the contractor, and the Government will be
reimbursed for the repair parts and labor costs.

Repair
A maintenance action required to restore an item to serviceable condition without affecting
the warranty.

Supplies
The end item and all assemblies/parts furnished by the contractor.

Supporting Repair Facility

The repair activity authorized to accomplish warrantable repairs at the appropriate level of
maintenance identified in the Maintenance Allocation Chart.

WARCO
Serves as the intermediary between the troops owning the equipment and the local dealer,
contractor or manufacturer. All warranty claim actions will be processed through the
WARCO.

0002-2
 TM 9-2320-341-10 0002

Warranty
A written agreement between a contractor and the Government which outlines the rights
and obligations of both parties for defective supplies.

Warranty Claim
Action started by the equipment user for authorized warranty repair reimbursement.

Warranty Expiration Date

The date the warranty is no longer valid. This date will be 13 months from the contractor
shipment date. This warranty period covers the basic 12 months plus on additional month
for shipping time.

Warranty Period
Time during which the warranty is in effect; normally measured as the maximum number of
years, months, days, miles, or hours used.

Warranty Start Date

The day shipment is put into effect (Contractor Shipment Date).

COVERAGE-SPECIFIC

This work package applies to:

Table 1. Vehicle Information

Noun Model NSN Cage

Truck, Tractor, LET M983A4LET 2320-01-534-2229 45152

(without winch)

NOTE
The item is manufactured by Oshkosh Truck Corporation (OTC), under
contract #W56HZV-07-C-0248. Inquiries to OTC can be made by calling
(920) 235-9151.

The contractor warrants the supplies are free from defects in design, material, and
workmanship for a period of thirteen (13) months from warranty start date.

If a Safety recall defect occurs during the vehicle warranty period, the contractor agrees to
extend the terms of the warranty to the time required to make necessary safety defect

0002-3
 TM 9-2320-341-10 0002

corrections. Also, if the contractor or his supplier(s) provide a greater warranty for the
supplies furnished, the contractor will provide the greater warranty to the Government.

If a defect/failure is caused by or falls within any of the following categories, it is not

considered warrantable and a claim should not be initiated:
1. Misuse or negligence
2. Accidents
3. Improper operation
4. Improper storage
5. Improper transport
6. Improper or insufficient maintenance
7. Improper alterations or repairs
8. Defect/failure discovered or occurring after warranty expiration date.
9. Fair wear and tear items (brake shoes, pads, armatures, brushes, etc.).

In addition to the 13 month warranty, the vehicles will be warranted for a total service life of
10 years including extended periods in a corrosion hazard military environment. During this
10 year service life, there will be no damage caused by corrosion requiring repair or
replacement of parts. No actions beyond normal washing or replacement of accident-
damaged paint shall be necessary to maintain the corrosive protection in place.

This 13 month warranty is extended up to nine (9) months from date of acceptance if the
vehicle is put into government storage before use. In this case, the warranty starts when
the vehicle is either taken out of storage or until nine (9) months from the warranty start date
shown on the warranty data plate, whichever occurs first. Refer to preparation for storage.

CONTRACTOR RESPONSIBILITIES

When the owning unit has directed the contractor to correct the supplies, the contractor will
furnish all material required to correct the defective supplies. Repairs and parts shall be
initiated/provided within ten (10) working days after receipt of written claim notification.
Furthermore, the contractor will provide a copy of the work order to owning unit upon
completion of repair.

When the contractor receives written notification requiring contractor repair, they will have
the option:
1. Correct the supplies in the field.
2. Return the vehicle or parts to the contractor's designated facility for correction.
When the contractor corrects the supplies, all labor involved shall be borne by the
contractor. Additionally, the contractor shall arrange and bear all transportation costs of the
supplies to its facility and return to user.

The contractor, within five (5) working days of receiving such notice, shall notify the warranty
claimant by telephone as to the method of correction, date(s) work is to be performed and
by whom.

0002-4
 TM 9-2320-341-10 0002

GOVERNMENT RESPONSIBILITIES

The Major Subordinate Command for the HEMTT is the U.S. Army Tank-Automotive and
Armaments Command (TACOM), Warren, MI 48397-5000. TACOM is responsible for
managing and implementing the warranty.

TACOM will:
Insure the contractor performs in accordance to the terms of the contract.

Equipment owning unit will:

1. Identify defects/failures and verify the defects/failures are warrantable.
2. Submit warranty claims, using DA Form 2407 (WP 0146) or DA Form 2407-1 (WP
0146) to your local Warranty Coordinator.
3. Tag and retain (IAW DA PAM 750-8 and this work package) (WP 0146) parts,
pieces of parts and/or assemblies removed at the owning unit level and as a result
of a warrantable defect/failure and/or correction.

Supporting repair facility will:

1. Identify defects/failures as warrantable (if owning unit has not already identified
them). Verify defects/failures are warrantable.
2. Review, process, and submit valid warranty claims to the local WARCO if the DA
Form 2407 (WP 0146) is complete and correctly filled out.
3. Reject invalid warranty claims or request additional information for incomplete and
incorrect claims.
4. Coordinate with the owning unit and decide which option for repair is desired to
correct the warrantable defect/failure.
5. Depending on which repair option was chosen (Government or contract repair)
provide labor/parts required to accomplish the warrantable repairs.
6. Tag and retain (IAW DA PAM 750-8 and this work package) (WP 0146) all parts,
pieces, or parts and/or assemblies removed as a result of warrantable defect/failure
and/or correction.

Local WARCO will:

1. Verify, review, process, and if valid and complete, submit claims (reimbursable and/
or disputes) to the contractor.
2. Reject claims that are not valid, and send them back to the local Unit with a short
explanation of why the claim is rejected.
3. Request additional information for incomplete claims.
4. Provide warranty claim acknowledgment closeout and/or parts/assemblies
disposition instructions to the local Unit.
5. Insure the contractor performs in accordance to the terms of the contract.
6. Verify, administer and process warranty claims.
7. Act as a liaison between owning unit, the contractor, supporting repair facility and
TACOM.

0002-5
 TM 9-2320-341-10 0002

8. Notify the owning units of all warranty claim acknowledgments/close-outs,

information and/or instructions received from TACOM or the contractor.
9. Act as a liaison between local dealers and the Army.
10. Enter all open and closed WCAs into the Army Electronics Product Support (AEPS),
Electronic Deficiency Reporting System.
11. The information/data provided on the DA Form 2407 (WP 0146) are placed into the
AEPS Deficiency Reporting System (DRS) at the installation WARCO office to
facilitate MSC management and tracking of warranties.

Alterations/Modifications
Alterations/modifications shall not be applied unless authorized by TACOM.

WARRANTY DATA PLATE

All vehicles will have a warranty data plate. The contractor is required to mount his data
plate within clear view of the operator.

When the vehicle is received, the owning unit should locate the warranty data plate and
check the warranty start date with date shown on the applicable DD Form 250 (WP 0146)
or DD Form 1149. (WP 0146) If these dates differ, disregard the data plate. The date shown
on the DD Form 250 (WP 0146) or DD Form 1149. (WP 0146) is the date to be used as a
warranty start date.

CLAIM PROCEDURES

The procedures for reporting warranty claims are found in DA PAM 750-8 (WP 0146) and
this work package. Responsibilities of the MACOM are found in AR 700-139. (WP 0146)
All Warranty Claim Actions are processed on DA Form 2407 (WP 0146) and DA Form
2407-1. (WP 0146) It is very important to fill in the blocks on the forms as accurately as
possible.

The contractor shall be notified in writing within 30 days, utilizing DA Form 2407 (WP
0146) by the local Warranty Control Office/Officer (WARCO) following the discovery of a
defect in supplies which requires contractor repair and/or replacement parts. This shall
constitute formal notification of a warranty claim, and initiate the time period for contractor
responsibilities and action under the warranty. This notification shall include, but not be
limited to furnishing of the equipment serial number, operating hours, part number or NSN
of the defective part and circumstances surrounding the defect(s). At this time, the
contractor will further be informed whether the owning unit has elected:
1. To correct the defect themselves.
2. To direct the contractor to correct the defect.
Upon completion of contractor repair, forward completed warranty claims (Information Only)
electronically to AEPS (Army Electronic Product Support) http://aeps.ria.army.mil.

The contractor shall reimburse the government for the cost of labor and/or replacement
parts involved in the government correction of the defect. The government's Maintenance

0002-6
 TM 9-2320-341-10 0002

Allocation Chart (MAC) determines the times. Additionally, the cost of replacement parts
obtained through the Government's supply channels will be determined by the amount
identified in the contractor's current commercial dealer net price or Army Master Data File
(AMDF) price, whichever is less. Furthermore, the owning unit may direct the contractor to
provide the replacement parts that prove to be defective within the warranty period, without
costs to the government, directly to their location or F.O.B., U.S. Port of Embarkation for
OCONUS. The contractor shall furnish replacement parts within 10 working days after
receipt of written claim notification. DO NOT submit warranty claims for reimbursement
where repair labor costs and replacement parts costs combined do not exceed $150.00 for
any one failure.

Identification Of Failed Items. Failed warranty items shall be tagged/identified to prevent

improper repair or use. Documents that describe the use of DA Form 2402 Maintenance
Tag (WP 0146) and DA Form 2407 Maintenance Request (WP 0146) shall be referenced.
Items requiring special handling, storage, or shipment during the processing of claims shall
be identified.

Disposition. The repair activity shall retain defective supplies for thirty (30) days following
receipt of acknowledgment of warranty claim from WARCO or contractor. If receipt of
acknowledgment is not received, inquiries should be made to your local WARCO. If receipt
of acknowledgment is received but no instructions are forthcoming within thirty (30) days of
receipt, supplies may be disposed.

Invalid Warranty Claims. When supplies are inspected by the contractor and found to be
non-warrantable due to abuse or improper maintenance, or the supplies are found to be
serviceable, the repair activity submitting the claim will be required to make reimbursement
for contractor services. All failed items returned for warranty claim action will be monitored
by the WARCO. Additionally, regarding contractor repair, the local WARCO must stipulate
at the time of request for services that either no non-warranty work be done or be prepared
to pay for such work.

REIMBURSEMENT FOR ARMY REPAIR

In the event that the repair activity should receive any reimbursement from the contractor,
the monies must be forwarded to the following address: Defense Accounting Office,
DAOTACOM, ATTN: DFAS-IN/EM-BED, TACOM, Warren, Michigan 48397-5000.

CLAIM DENIAL/DISPUTES

All denials or disputes will be handled by TACOM.

REPORTING

Reporting or recording action on a failed item shall be specified in DA PAM 750-8. (WP
0146) Contractor or repair activity unique forms shall not be used.

0002-7
 TM 9-2320-341-10 0002

STORAGE/SHIPMENT/HANDLING

Storage
See coverage-specific data above (last paragraph) and preparation for storage for further
information.

Shipment
See contractor responsibilities data above (second paragraph), claim procedures (third
paragraph), and preparation of equipment for transportation/shipment for further
information.

Handling
See contractor responsibilities data above (second paragraph), claim procedures (third
paragraph), and safety, care, and handling for further information.

END OF WORK PACKAGE

0002-8
 TM 9-2320-341-10 0003

OPERATOR MAINTENANCE
EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES

EQUIPMENT CHARACTERISTICS

The M983A4 LET tractor is used to transport construction equipment.

EQUIPMENT CAPABILITIES

1. All models are capable of operating in temperatures from -25 to 120°F (-32 to 49°
C) and to -50 to 120°F (-46 to 49°C) with arctic kit installed.
2. All models can ford water up to 48 in. (1 219 mm) deep for 5 minutes without
damage or without requiring maintenance before operation can continue.
3. Normal operating range of all models is 300 miles (483 km), based upon 154 gallons
(583 L) of fuel and 109,000 lbs (49 486 kg) GCWR, traveling over mixed terrain.
Varying loads, prolonged idle, use of power takeoff (PTO), off-road driving, and
climatic conditions affect operating range.
4. All models are provided with sufficient tiedown points located so vehicles can be
restrained in all directions during air transport in C-130, C-5A, and C-17 type
aircraft.
5. All models are also capable of being transported by highway, rail, and sea.

EQUIPMENT FEATURES

1. Caterpillar C15 (on-highway) electronically controlled, in-line six-cylinder, 4-cycle,

fuel injected, turbocharged diesel engine.
2. Push button automatic transmission with one reverse speed and five forward
speeds.
3. Anti-Lock Braking System (ABS) to all eight wheels which can be disabled by the
operator for off-road operation.
4. Operator controlled 4-wheel/8-wheel drive and high and low range transfer case
for positive traction in areas of unimproved road surfaces.
5. Power steering system consists of basic manual steering system with hydraulic
boost. Mechanical linkage also provides operator control in event of hydraulic oil
pressure loss.
6. Fuel system includes one fuel tank, fuel lines, fuel/water separator, fuel pump,
secondary filter, fuel pipes, and fuel injectors.
7. Two front and two rear towing eyes.
8. Manual-release-type rear pintle hook which will allow towing of a trailer.
9. Radio frequency interference suppression to permit voice radio communications
during all phases of operation.

0003-1
 TM 9-2320-341-10 0003

END OF WORK PACKAGE

0003-2
 TM 9-2320-341-10 0004

OPERATOR MAINTENANCE
LOCATION AND DESCRIPTION OF MAJOR COMPONENTS

VEHICLE COMPONENT LOCATION

Table 1. HEMTT Series Vehicle Common Component Location.

1
3 4 5 1 6
7

8 8

Figure 1.

1 Personnel Cab. Provides protection from weather for crew and vehicle controls,
gauges, and indicators.

2 Engine Compartment. Engine supplies power to move vehicle and operate equip-
ment and accessories.

0004-1
 TM 9-2320-341-10 0004

Table 1. HEMTT Series Vehicle Common Component Location. - Continued

3 No. 1 Driving Axle. Controls direction of vehicle when in motion. When needed,
transmits power to hubs to turn wheels.

4 No. 2 Driving Axle. Controls direction of vehicle when in motion. When needed,
transmits power to hubs to turn wheels.

5 No. 3 Driving Axle. Supports weight of vehicle, and transmits power to hubs to turn
rear wheels.

6 No. 4 Driving Axle. Supports weight of vehicle, and transmits power to hubs to turn
rear wheels.

7 Fuel Tank. Stores fuel used to operate engine. Receives excess fuel not used by
engines fuel injection system.

8 Tow Eyes. Attachment points for safety chains, towing shackles, and towing.

14
12
15

13
17 16
9

10 11

Figure 2.

0004-2
 TM 9-2320-341-10 0004

Table 1. HEMTT Series Vehicle Common Component Location. - Continued

9 Charge Air Cooler. Intake of air is used to cool engine inlet air temperature, trans-
mission oil, and hydraulic system fluid.

10 Fuel/Water Separator. Acts as primary fuel filter and removes any water from fuel
before entering engine.
Ether Canister. Located next to fuel/water separator, the ether canister contains
ether for use as cold weather starting aid.

11 Hydraulic Reservoir. Stores, cools, and filters oil used in hydraulic and power steer-
ing systems.

12 Radiator. Intake of air is used to cool engine coolant and cabin air conditioning sys-
tem.

13 Tire Carrier (shown raised). Used to raise and lower spare tire.

14 Air Cleaner. Filters out dust and debris from air entering air induction system.

15 Battery Box. Houses and protects four storage batteries.

16 Air Reservoirs. Used to store air system air.

17 Self-Recovery Winch (not used on all vehicles). Used to help vehicle pull itself
free of obstructions.

0004-3
 TM 9-2320-341-10 0004

Table 2. M983A4 LET Tractor Vehicle Specific Component Location.

3
6
5

2 1 2
4 6

Figure 3.

1 Heavy–Duty Winch. Powered by PTO to perform winching operations.

2 Stowage Box. Used to stow COEI, BII, (WP 0147)AAL, (WP 0148) and other mission
essential items.

3 Access Ladder. Used by crew to clean window, check oil, or perform other tasks
requiring access to parts of vehicle out of normal reach.

4 Semitrailer Gladhands. Provides air to semitrailer brake system through intercon-

necting air lines.

5 Semitrailer Electrical Connector. Supplies power to semitrailer electrical system

through intervehicular cable.

6 Fifth Wheel. Couples semitrailer to tractor vehicle.

7 Wheel Chock Stowage Box. Used to stow two wooden wheel chocks.

0004-4
 TM 9-2320-341-10 0004

END OF WORK PACKAGE

0004-5
 TM 9-2320-341-10 0005

OPERATOR MAINTENANCE
DIFFERENCES BETWEEN MODELS

Table 1. Differences Between HEMTT A4 Models.

Equipment Model

M983 M985 M1120 M1977

M977 M978 M983 M984 M985
LET GMT LHS CBT
(Note (Note (Note (Note (Note
(Note (Note (Note (Note
1) 1) 2) 2) 1)
3) 2) 1) 1)

10 ft. (3.05 •
m)
Equipment
Body

18 ft. (5.49 • • •
m)
Cargo Body

Cargo Cov- • • •
er
Kit

Heavy-Duty • •
Winch

Rear Bea- •
con
Lights
(Note 4)

Work Lights • • • •
(Note 5)

MHC977 •
Grove
Crane

0005-1
 TM 9-2320-341-10 0005

Table 1. Differences Between HEMTT A4 Models. - Continued

Equipment Model

M983 M985 M1120 M1977

M977 M978 M983 M984 M985
LET GMT LHS CBT
(Note (Note (Note (Note (Note
(Note (Note (Note (Note
1) 1) 2) 2) 1)
3) 2) 1) 1)

MHC985 •
Grove
Crane

MHC984 •
Grove
Crane

8108-2/2C •
D
HIAB Crane
(Note 6)

Fifth Wheel • •

3.5 inch • •
(89 mm)
Kingpin

Semitrailer •
Spare Tire
Carrier

Load Han- •
dling •
System

Table 2. Notes.

Note:
1. Vehicle can be equipped in either of two configurations: with or without optional
self-recovery winch.
2. Vehicle equipped with self-recovery winch.
3. Self-recovery winch not available for this model.
4. All HEMTT series vehicles are authorized to carry portable beacon light as an
optional accessory.

0005-2
 TM 9-2320-341-10 0005

Table 2. Notes. - Continued

5. All HEMTT series vehicles are authorized to carry portable work lamp as an op-
tional accessory.
6. See data plate on base of crane loader body unit to determine model number.

END OF WORK PACKAGE

0005-3
 TM 9-2320-341-10 0006

OPERATOR MAINTENANCE
EQUIPMENT DATA

EQUIPMENT DATA

Table 1. Vehicle Operation.

Operating Mode: On and off-road

Operating Temperature w/o Arctic Kit: -25 to 120°F (-32 to 49°C)

Operating Temperature w/Arctic Kit: -50 to 120°F (-46 to 49°C)

Table 2. M983A4 LET Vehicle Dimensions.

Width (overall): 96 in. (2 438 mm)

Height (overall): 119 in. (3 022 mm)

Height (reduced for shipping): 102 in. (2 590 mm)

Length Overall: 359 in. (9 119 mm)

Wheelbase: 184 in. (4 673 mm)

Turn Circle (curb to curb): 95 ft. (29 m)

Ground Clearance: 24 in. (610 mm)

Center of Gravity:See shipping data plate on inside of driver side door.

Table 3. M983A4 LET Vehicle Weight.

Curb Weight: 37,400 lbs (16 980 kg)

Gross Vehicle Weight Rating (GVWR): 86,000 lbs (39 044 kg)

Gross Combination Weight Rating (GCWR): 151,000 lbs (68 554 kg)

0006-1
 TM 9-2320-341-10 0006

Table 4. M983A4 LET Vehicle Weight Distribution.

Fifth Wheel Vertical Load Rating: 40,000 lbs (18 160 kg)

Gross Towing Weight: 100,000 lbs (45 400 kg)

Front Tandem Axles-Curb: 21,800 lbs (9 897 kg)

Front Tandem Axles-Loaded: 32,000 lbs (14 528 kg)

Rear Tandem Axles-Curb: 10,400 lbs (4 721 kg)

Rear Tandem Axles-Loaded (maximum): 52,000 lbs (23 608 kg)

Table 5. Vehicle Performance.

Cruising Range at GCWR: 300 mi. (483 km)

Maximum Sustained Forward Speed (at 1696 rpm) - 5th Gear: 62 mph (101 km/h)

Maximum Sustained Forward Speed (at 2100 rpm) - 4th Gear: 60 mph (97 km/h)

Maximum Sustained Forward Speed (at 2100 rpm) - 3rd Gear: 39 mph (63 km/h)

Maximum Sustained Forward Speed (at 2100 rpm) - 2nd Gear: 27 mph (43 km/h)

Maximum Sustained Forward Speed (at 2100 rpm) - 1st Gear: 12.7 mph (20 km/h)

Speed on 3% Grade at GCWR: 25 mph (40 km/h)

Speed on 3% Grade at GVWR: 40 mph (64 km/h)

Speed on 30% Grade at GCWR: 3 mph (5 km/h)

Speed on 30% Grade at GVWR: 5 mph (8 km/h)

Maximum Grade at GCWR: 30 percent

Maximum Grade at GVWR: 60 percent

Maximum Side Slope w/Adequate Traction Surface: 30 percent

Maximum Towed Speed (refer to FM 4-30.31 ): 15 mph (24 km/h)

0006-2
 TM 9-2320-341-10 0006

Table 5. Vehicle Performance. - Continued

Maximum Ford Depth: 48 in. (1 219 mm)

Approach Angle: 32 degrees

Departure Angle: 43 degrees

Limp Home Speed: 10 mph (16 km/h) for up to 30 miles (48 km)

Table 6. Fluid Capacities.

Refer to lubrication instructions in operator's PMCS (WP 0134) for vehicle fluid capacities.

Table 7. Engine.

Make: Caterpillar

Model: C15 (On-Highway)

Type: 4-Stroke, In-line Diesel

Cylinders: 6

Bore: 5.4 in. (137 mm)

Stroke: 6.75 in. (171.5 mm)

Displacement: 927.6 cid (15.2 L)

Torque (at 1200 rpm): 1650 lb-ft (2237.4 Nm)

Maximum Brake Horsepower (at 1800 rpm): 515 BHP (384 kW)

Maximum Governed Engine Speed - Loaded: 2050 - 2150 rpm

Maximum Governed Engine Speed - No Load: 2070 - 2170 rpm

Oil Filter Type: Full flow, replaceable element

Oil Filter Quantity: 1

0006-3
 TM 9-2320-341-10 0006

Table 8. Fuel System.

Type: Diesel Injection

Tank Quantity: 1

Air Cleaner Type: Dry element with pre-cleaner

Element Quantity: 1 Primary

Table 9. Electrical System.

Voltage: 24

Alternator (amps): 260

RFI Suppression Ability: Yes

Number of Batteries: 4

Battery Voltage (each): 12 volts

Battery Connection: Series - parallel

Battery Capacity (at 20 hour rate): 900 amp

Battery Reserve Capacity (each, at 80°F/27°C): 180 minutes

Battery Cold Cranking Amps (each, at 80°F/27°C): 575 CCA

Battery Amp Hours (each, at 20 hour rate): 100 amp

Table 10. Cooling System.

Radiator Working Pressure: 7 psi (48 kPa)

Table 11. Transmission.

Make: Allison

Model: 4500 SP

Type: Automatic

0006-4
 TM 9-2320-341-10 0006

Table 11. Transmission. - Continued

Number of Forward Speeds: 5

Number of Reverse Speeds: 1

Table 12. Transfer Case.

Make: Oshkosh

Model: 55000

Type: Air-operated front tandem disconnect

Ratios: 0.98:1 and 2.66:1

Table 13. Front Tandem Axles.

Front Tandem

Make: Oshkosh/Dana Heavy Axle

Differential Carrier Model Nos.: No. 1 axle: RS480, No. 2 axle: DS480-P

Maximum Steering Angle: 28 degrees

Table 14. Rear Tandem Axles.

Make: Dana Heavy Axle

Differential Carrier Model Nos.: No. 3 axle: DS520-P, No. 4 axle: RS520

Table 15. Brake System.

Actuation: Air with integrated Automatic Braking System (ABS)

Number of Brake Chambers: 8

Pressure Range: 60 - 120 psi (4.14 - 8.27 bar)

0006-5
 TM 9-2320-341-10 0006

Table 16. Wheels.

Type: Two-piece bolt together wheel

Quantity: 8

Spare Quantity: 1

Rim Size: 20 x 10

Stud Quantity Per Wheel: 10

Table 17. Tires.

Type: Radial without tube

Quantity: 8

Spare Quantity: 1

Tread Type: Radial traction, non-directional

Size: 16.00R x 20 in.

Load Range: M

Table 18. Steering System.

Type: Dual gear with integrated hydraulic power assist

Table 19. Towing Eyes.

Quantity: 4 (2 front, 2 rear)

Maximum Load Capacity Each: 60,000 lbs (27 240 kg)

Table 20. Pintle Hook.

Type: Manual Release

Maximum Load Capacity - Pulling: 30,000 lbs (13 620 kg) in off-road application

Maximum Load Capacity - Vertical: 1,700 lbs (771 kg)

0006-6
 TM 9-2320-341-10 0006

Table 21. Fifth Wheel.

Type: Full (4-way) oscillating with kingpin lock

Kingpin Size: 3.5 in. (89 mm)

Side Articulation of Top Plate: 5 degrees

Front and Rear Articulation of Top Plate: 27-28 degrees

Table 22. Cab.

Windshield: Tinted, two-piece, safety glass

Personnel Capacity: 2

Air Conditioning

Table 23. Heavy-Duty Winch.

Make: DP Manufacturing

Model: 45K

Type: Two Speed Variable Displacement

Wire Rope Diameter: 7/8 in. (22 mm)

Wire Rope Length: 150 ft. (45.75 m)

Line Pull - First Layer: Low Speed: 45,000 lbs (20 430 kg), High Speed: 16,600 lbs (7
536kg)

Line Pull - Second Layer: Low Speed: 37,200 lbs (16 889 kg), High Speed: 13,700 lbs
(6 220 kg)

Line Pull - Third Layer: Low Speed: 31,700 lbs (14 392 kg), High Speed: 11,700 lbs (5
312 kg)

Line Pull - Fourth Layer: Low Speed: 27,700 lbs (12 576 kg), High Speed: 10,200 lbs
(4 631 kg)

0006-7
 TM 9-2320-341-10 0006

Table 24. Auxiliary Equipment.

Arctic Engine Heater Kit

Chemical Alarm

Decontamination Unit

Gas Particulate Filter Unit

Machine Gun Ring with Gunner's platform and Gunner's restraint system

Radio Installation Kit

Rifle Mounting Kit

C4ISR Electronic Suite

Armor with Gunner's Protection Kit (GPK)

Note: Vehicle may or may not be equipped with any of these items depending on mission,
climate, or other factors.

Table 25. M983A4 LET Tractor Vehicle Load Classification.

UNLOADED FULL LOAD

WITH TRAILER LOADED (TONS)
(TONS) (TONS)

14 N/A Unknown at time of publish

TIRE PRESSURES

Table 26. M983A4 LET Tractor Vehicle Tire Pressures.

CROSS- CROSS-
SANDY
TIRE HIGHWAY COUNTRY COUNTRY
TERRAIN
(DRY) (WET)

Front Tire Pressure

STANDARD 60 psi (414 kPa) 35 psi (241 kPa) 20 psi (138 kPa) 20 psi (138
(XZL) TIRE kPa)

0006-8
 TM 9-2320-341-10 0006

Table 26. M983A4 LET Tractor Vehicle Tire Pressures. - Continued

CROSS- CROSS-
SANDY
TIRE HIGHWAY COUNTRY COUNTRY
TERRAIN
(DRY) (WET)

SAND TIRE 60 psi (414 kPa) NA NA 25 psi (172

kPa)

Rear Tire Pressure

STANDARD 100 psi (690 kPa) 75 psi (517 kPa) 45 psi (310 kPa) 45 psi (310
(XZL) TIRE kPa)

SAND TIRE 100 psi (690 kPa) NA NA 45 psi (310

kPa)

Spare Tire Pressure

STANDARD 100 psi (690 kPa) 100 psi (690 kPa) 100 psi (690 100 psi
(XZL) TIRE kPa) (690 kPa)

SAND TIRE 100 psi (690 kPa) NA NA 100 psi

(690 kPa)

OPERATING SPEEDS

Table 27. Operating Speeds.

HIGHWAY CROSS- COUN- CROSS- COUN- SANDY

TRY (DRY) TRY (WET) TERRAIN

STANDARD 62 mph (100 km/ 40 mph (64 km/h) 20 mph (32 km/h) 20 mph (32
(XZL) TIRE h) km/h)
(maximum
Speed)

SAND TIRE 62 mph (100 km/ NA NA 20 mph (32

(maximum h) km/h)
Speed)

END OF WORK PACKAGE

0006-9
 TM 9-2320-341-10 0007

OPERATOR MAINTENANCE
SELF-RECOVERY WINCH

SELF-RECOVERY WINCH

The self-recovery winch (1), where used, is mounted on the passenger side chassis frame
rail between the second and third axles.

INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT

PULL TO
ER
TRAILSUPPLYING
AIR PARK
FOR AND

LY
NOT MIDL

S U PP
PU S H T O

CHEM
ALARM

AUX
HYD HYD
ENABLE
GPPU
2
M
M
12

ASS

HIGH
IDLE
n
AllTransisomission

Figure 1.

0007-1
 TM 9-2320-341-10 0007

The self-recovery winch (1) is powered by a reversible hydraulic motor which drives the
winch drum through a planetary gearbox.
It is equipped with an automatic brake that is applied whenever the cab control lever (2) is
in center position.

NOTE
The M984A4 wrecker equipped with a self-recovery winch does not em-
ploy an operator controlled, two-position hydraulic selector valve to acti-
vate the reversible winch motor.
All vehicles (except the M984A4 wrecker) equipped with a self-recovery winch (1) have an
operator controlled, two-position hydraulic selector valve (WP 0025) to activate the
reversible winch motor.

END OF WORK PACKAGE

0007-2
 TM 9-2320-341-10 0008

OPERATOR MAINTENANCE
ELECTRICAL SYSTEM

ELECTRICAL SYSTEM

NOTE
• Wiring harnesses are used to carry current to operate equipment and
accessories.
• The electrical system is a 24 VDC system.
Four 12 VDC storage batteries (1) are connected in series-parallel with the negative terminal
grounded.

1
6
7
CHEM INTER 25 6.2
ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 1.

A belt-driven 24 VDC alternator (2) having a capacity of 260 amps maintains the charge on
the batteries.

0008-1
 TM 9-2320-341-10 0008

The voltage regulator (3) is mounted on the belt-driven 24 VDC alternator (2) and maintains
a 24-volt level for battery charging.
The heavy-duty starting motor (4) operates directly from the 24 VDC source through the
engine start switch (5).

NOTE
The battery readout is located in the top right corner of the instrument
panel liquid crystal display (LCD).
The battery readout (6) shows the state of charge of the batteries and alternator voltage
output.
The vehicle electrical circuits are protected against overloads by automatic reset circuit
breakers (7) located below the cab engine access panel along the aft bulkhead between
the operator and crew seats.

END OF WORK PACKAGE

0008-2
 TM 9-2320-341-10 0009

OPERATOR MAINTENANCE
AIR SYSTEM

AIR SYSTEM

NOTE
The call out number for the air reservoirs below matches the actual air
reservoir number.
The air system consists of five air reservoirs (1, 2, 3, 4, and 5) and an engine-driven air
compressor (6).

0009-1
 TM 9-2320-341-10 0009

FRONT
6

13

INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST

11
SELECT
PULL TO

ILER
TRA SUPPLYNG
AIR PARKIND
FOR
LY

NOT MIDLA
SU PP

PU S H T O

11
CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
12

ASS

HIGH
IDLE

AlliTransmson
ission

5 2

8 15
1
12 3
10 4

9 9
14

Figure 1.

0009-2
 TM 9-2320-341-10 0009

NOTE
• The air system includes the necessary valves and air lines to control
the vehicle's air-operated parts.
• On the M983A4 LET tractor vehicle, air from reservoir is controlled
by the winch tensioner and winch declutch manual valves, which in
turn operate the heavy-duty winch kickout and cable hold down
systems.
Pressurized air from the air compressor (6) is passed through the air dryer (7) to the
reservoir (1) - also called the “wet tank.” The air dryer (7) removes dirt and moisture from
the pressurized air.
Once air pressure in reservoir (1) rises above 65 to 75 psi (4.5 to 5.2 bar), a valve opens
and allows reservoirs (2, 3, 4, and 5) to be pressurized up to 133 psi (9.2 bar).
Air from reservoir (4 and 5) goes to the brake treadle valve (8). This air controls the rear
axle service parking brakes (9). Air pressure for reservoirs (4 and 5) is displayed by REAR
air pressure gauge (10).
Air from reservoir (2 and 3) goes to the brake treadle valve (8). This air controls the front
axle service brakes (11). Air pressure for reservoirs (2 and 3) is displayed by FRONT air
pressure gauge (12).
The PARKING BRAKE valve (13) controls air from reservoirs (4 and 5) and applies or
releases the rear axle service parking brakes (9).
Reservoirs (2 and 3 or 4 and 5) are interconnected so that if one reservoir fails, air is supplied
to release the rear axle service parking brakes (9) from whichever reservoir is functioning.
A buzzer will sound and the brake system failure (low air) indicator (14) will illuminate if air
pressure falls below 65 to 75 psi (4.5 to 5.2 bars).

NOTE
• There is a SPNSN LOW AIR indicator that warns when the
suspension system is low with air and it will not dump.
• A SPNSN LOW AIR indicator will illuminate if one or more zones of
air springs are deflated.
Specific to the M984A4, the front brake actuator valve (15) is used to apply the front axle
service brakes when using heavy-duty winch.

END OF WORK PACKAGE

0009-3
 TM 9-2320-341-10 0010

OPERATOR MAINTENANCE
MAIN HYDRAULIC SYSTEM

MAIN HYDRAULIC SYSTEM

The main hydraulic system consists of a power take-off (PTO) driven hydraulic pump (1)
and a fluid reservoir (2) shared with the power steering hydraulic system.

1
2

Figure 1.

0010-1
 TM 9-2320-341-10 0010

NOTE
• The M983A4 LET is not equipped with a self-recovery winch, but is
equipped with a manually-operated hydraulic selector valve to supply
hydraulic power to the heavy-duty winch.
• The M984A4 is equipped with a self-recovery winch, but does not
have a manually-operated hydraulic selector valve.
Any vehicle (see notes above) may also be equipped with a self-recovery winch (3) and a
manually operated hydraulic selector valve (4).
The main hydraulic system includes the material handling cranes (5) on the M977A4
(shown), M985A4, and M985A4 GMT as well as the main fuel pump on the M978A4, and
load handling system on both the M1120A4 LHS and M1977A4 CBT.

FLUID SYSTEM

Pump (1) mounted on the rear of engine provides the fluid power to operate the power
steering (2).

5 6
1 10 8 11
3
4

7
12 9

Figure 2.

Fluid power for operating the self-recovery winch (3) and crane (4) is provided by a hydraulic
pump (5) driven by the power take-off (PTO) mounted on the transmission.
A manually-operated selector valve (6) is used to activate either the self-recovery winch (3),
crane (4), fuel tanker dispensing components (M978 only), or load handling system (LHS)
on M1120 LHS and M1977 CBT.
Operation on the crane (4) is controlled from the control panel (7) at the rear of the vehicle.
Both hydraulic pumps (1 and 5) share the same reservoir (8).

END OF WORK PACKAGE

0010-2
 TM 9-2320-341-10 0011

OPERATOR MAINTENANCE
STEERING SYSTEM

POWER STEERING HYDRAULIC SYSTEM

Power is supplied to the main steering gear by an engine-driven pump (1).

5 5 2

4 1

Figure 1.

The fluid reservoir (2) is shared with the main hydraulic system.
The steering wheel (3), which is mechanically linked to the main steering gear, rotates a
gear that positions a spool in the main steering gear.
This motion is hydraulically transmitted to a piston in the slave gear causing it to follow the
rotation of the main gear.
The main gear pitman arm (4) is mechanically connected to the slave gear pitman arm.

0011-1
 TM 9-2320-341-10 0011

These pitman arms move the steering mechanism on the front axles (5) left or right causing
the vehicle to steer left or right.

END OF WORK PACKAGE

0011-2
 TM 9-2320-341-10 0012

OPERATOR MAINTENANCE
POWER TRAIN

POWER TRAIN

The drivetrain control system consists of the engine and transmission systems.
The vehicle drivetrain is enhanced through the use of an engine electrical control system
and 4500SP electronic transmission controller.
The engine electrical control and 4500SP transmission systems perform self-diagnostics,
engine/transmission system diagnostics, and vehicle performance diagnostics.
Self-diagnostics includes personnel-initiated checks of main electronic components such
as solenoids, wiring, sensor, and control modules.
System-diagnostics monitor critical engine and transmission parameters such as oil
temperature, oil pressure, coolant temperature, voltage, and gear range attained.
Vehicle performance diagnostic capabilities aid the mechanic in isolating problems outside
of the electronic control system.
Operating data is stored in the engine electrical control system and 4500SP electronic
transmission controller memory for display at a later time.

Power Train
Power for the vehicle is provided by a diesel engine (1), which is coupled directly to an
automatic transmission (2).

Figure 1.

0012-1
 TM 9-2320-341-10 0012

Power from the transmission is transferred to the transfer case (3) and on to front and rear
axles (4) through a series of drive shafts and universal joints (5).

AUTOMATIC TRANSMISSION

HEMTT series vehicles use an Allison HD4000 series transmission model 4500SP.
This hydrokinetic type transmission has an integral-locking torque converter, lock-up clutch,
constant mesh planetary gearing, the GEN IV, a speedometer, and control valve module
assembly.
The primary components of the GEN IV system are the Transmission Control Module
(TCM), transmission range selector in the vehicle cab, a control valve module beneath the
transmission gearing section which contains solenoid valves for clutch control, an engine
speed sensor, a turbine speed sensor, and an output speed sensor that relays the
transmission output speed to the TCM for shifting and control functions.

0012-2
 TM 9-2320-341-10 0012

2
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT

PULL TO
ER
TRAILSUPPKING LY
AIRNOT FORMIDLPARAND

LY
SUPP
PUSH TO

CHEM
ALARM

GPPU

1
HYD
ENABLE

M
M
12

ASS

HIGH
IDLE

AlTranslismissonion

OUTPUT
SPEED
SENSOR TCM
TURBINE SPEED
SENSOR

CONTROL VALVE ENGINE SPEED

MODULE SENSOR

Figure 2.

The TCM also protects the transmission from cold weather startups by inhibiting normal
shifting functions until a minimum sump temperature of 20°F (-7°C) is attained.
A check transmission indicator (2) located on the instrument panel alerts the operator,
momentarily, every time the system is activated as a lamp check, and when the TCM finds
a problem in the system.
If check transmission indicator (2) comes on during vehicle operation, the transmission will
continue to operate normally, in most cases. However, in some cases, the TCM will take

0012-3
 TM 9-2320-341-10 0012

action to reduce the possibility of damage to the vehicle or the transmission (refer to limp
home/transmission fault (WP 0101) for more information. The transmission should be
serviced at the next opportunity.
The transmission range selector (1) allows the operator to select a vehicle drive range.
Operate transmission and transfer case (WP 0048) provides full operating instructions for
the transmission.
The TCM contains the microprocessor based electronics and is located in a protected area
within the vehicle cab.
The TCM receives information in the form of signals from switches and sensor, processes
the information, and sends electrical signals to the appropriate components, which control
the operation.
The TCM features diagnostics, which can sense electronic system malfunctions and identify
them with a displayed code.
Diagnostic codes can be accessed by two methods: a diagnostic data reader connected to
the vehicle at the electronic diagnostic receptacle or through the transmission range
selector (1) push buttons.

0012-4
 TM 9-2320-341-10 0012

ELECTRONIC
DIAGNOSTIC
RECEPTACLE

Figure 3.

All lubricating and clutch-applied oil is provided by an engine-driven pump (in the
transmission).
The transmission includes an electrically-controlled power take-off (PTO).
The PTO provides power to a hydraulic pump, which powers the vehicle's hydraulic system.
The hydraulic system operates the self-recovery winch, the material handling crane, the
heavy-duty recovery winch, and the pumping equipment, depending on how the vehicle is
equipped.

0012-5
 TM 9-2320-341-10 0012

TRANSFER CASE

The transfer case (1) connects the drivetrain to the No.1 and No. 2 axles (2) when 8-wheel
drive is needed.

Figure 4.

The transfer case has two gear ratios (high and low) and neutral. The vehicle must be
stopped before the transfer case can be shifted between ranges because the gears are not
synchronized.
Engagement of the transfer case in low range will automatically engage the drivetrain to the
front axles.

TANDEM AXLES AND SUSPENSION

Front and rear axles (1) are single reduction, full floating axle shaft type.

1 1

Figure 5.

The front two axles provide vehicle steering

The rear two axles are non-steering.

0012-6
 TM 9-2320-341-10 0012

Both front and rear axles are equipped with wheel differentials and inter-axle differentials.
The inter-axle differential have driver-controlled lockouts for positive drive to all axles in low
range.
The rear axles are equipped with permanently engaged controller traction differentials.
The front and rear suspensions are air spring, transverse beam type.

PROPELLER SHAFTS AND UNIVERSAL JOINTS

The propeller shafts and universal joints (1) transmit engine power to the axles.

1
1

1
1

Figure 6.

END OF WORK PACKAGE

0012-7
 TM 9-2320-341-10 0013

OPERATOR MAINTENANCE
ENGINE SYSTEMS

ENGINE

NOTE
The Caterpillar C15 (on-highway) engine and is controlled electronically.
The primary components of electronic control system are electronic unit injector (EUI),
electronic control module (ECM), and engine sensors.
The ECM (1) contains:

Figure 1.

1. A microprocessor that continuously monitors and analyzes the engine and

accompanying systems with electronic sensors during engine operation.
2. A programmable read only memory (PROM) provides basic engine control function
instructions.
3. An electronically erasable, programmable, read only memory (EEPROM) stores
engine calibration values.

0013-1
 TM 9-2320-341-10 0013

4. A backup EEPROM and microprocessor monitors and analyzes engine operation

should the main microprocessor fail and a throttle position sensor (2) input, which
is activated by the accelerator pedal.

25 6.2
22 5.5
15 3.7
11 2.7
8 2.0

IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

PARKING
BRAKE

TRAILER
AIR SUPPLY

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7

3
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 2.

The EUI allows precise metering and injection timing.

The engine sensors monitor key parts of the engine for performance and environmental
variables.
The ECM (1) features diagnostics which can sense electronic system malfunctions and
identify them by displaying a code.
A check engine indicator (3) on instrument panel will illuminate when a noncritical fault
occurs, but the vehicle can still be operated.
Diagnostic codes can be accessed by a PC based software program or a diagnostic data
reader connected to the vehicle at the electronic diagnostic receptacle (4).

0013-2
 TM 9-2320-341-10 0013

AIR INTAKE SYSTEM

The air intake system consists of a dry type air cleaner (1), turbocharger (2), engine blower
(3), and an aftercooler (4).

1 2 3

Figure 3.

Engine exhaust gases flow through the turbocharger (2) driving a turbine wheel.

0013-3
 TM 9-2320-341-10 0013

A compressor wheel on the opposite end of the turbine wheel shaft rotates and draws in
fresh air through the air cleaner (1), compresses the air, and delivers it to the engine blower
(3).
Air from the engine blower (3) flows through the aftercooler (4) which cools the air before it
is delivered to the engine cylinders.

FUEL SYSTEM

NOTE
The fuel circuit is a conventional design for electronic unit injector diesel
engines.
The fuel transfer pump (1) draws fuel from fuel tank (2).

4 10
9

11
7

1 3 2

Figure 4.

The fuel passes through primary filter/water separator (3).

The fuel passes into the fuel transfer pump (1) and the fuel is then pressurized.
The fuel transfer pump (1) incorporates a check valve in order to permit a fuel flow around
the gears for hand priming.
The fuel transfer pump (1) also incorporates a relief valve in order to protect the system
from extreme pressure.

0013-4
 TM 9-2320-341-10 0013

NOTE
The excess fuel flow also purges the air from the fuel system.
The excess fuel flow that is provided by the transfer pump (1) is used in order to cool the
electronic unit injectors (4).
The fuel from the transfer pump (1) flows through two micron fuel filters (5) at fuel filter base
(6).
Fuel temperature sensor (7) is mounted in the fuel filter base (6).

NOTE
• The engine control module (ECM) uses the sensor to monitor the
temperature of the fuel that is entering the engine.
• The information is used by the ECM to calculate a fuel correction
factor during engine operation.
Fuel priming pump (8) is positioned on the fuel filter base (6) in order to prime the system
when air has been introduced into the fuel system.

NOTE
The fuel enters the cylinder head at the front of the engine.
The fuel leaves the fuel filter base (6) and flows through fuel supply line (9) to the cylinder
head.
Fuel is delivered to electronic unit injectors (4) through fuel manifold (10) that is drilled into
the cylinder head during the manufacturing process.

NOTE
Excess fuel exits the cylinder head at the rear.
The fuel returns to the fuel filter base (6) through fuel return line (11) to the pressure
regulating valve that maintains a sufficient amount of back pressure in the system in order
to fill the electron unit injectors (4).

NOTE
After the fuel passes through the pressure regulating valve, the fuel re-
turns to the fuel tank.
The fuel flows continuously from the fuel supply through the electronic unit injectors (4) in
the head and back of the tank.

COOLING SYSTEM

Air is pulled through the air cleaner, and into the air inlet (1) by the low pressure turbocharger
(2).

0013-5
 TM 9-2320-341-10 0013

9 8
10 7

13

6
11
5
4
12
15 14
16 3

2
1

Figure 5.

NOTE
Pressurizing the inlet air causes the air to heat up.
The low pressure turbocharger (2) compresses the air.

NOTE
• The high pressure turbocharger is used to compress the air to a
higher pressure.
• This increase in pressure continues to cause the inlet air's
temperature to increase.
Pressurized air exits the low pressure turbocharger (2) through an outlet (3) and the air is
forced into the inlet (4) of high pressure turbocharger (5).

NOTE
• The precooler uses engine coolant to cool the air.
• Without the precooler, the inlet air would be too hot in order to be
cooled sufficiently by the aftercooler
As the air is compressed, the air is forced through the high pressure turbocharger's outlet
(6) and into the precooler (7).

0013-6
 TM 9-2320-341-10 0013

NOTE
• The inlet air is cooled further by transferring heat to the ambient air.
• The combustion efficiency increases as the temperature of the inlet
air decreases.
• Combustion efficiency helps to provide increased fuel efficiency and
increased horsepower output.
• The aftercooler core is a separate cooler core that is mounted in front
of the engine radiator.
• The engine fan and the ram effect of the forward motion of the vehicle
causes ambient air to move across the core.
The pressurized inlet air is cooled by the precooler (7) prior to being sent to the aftercooler
(8).
Inlet air is forced from the aftercooler (7) into the engine's intake manifold.

NOTE
• The airflow from the intake manifold into the cylinders and out of the
cylinders is controlled by engine's valve mechanisms.
• The inlet valves open when the piston moves downward on the inlet
stroke.
• When the inlet valves open, cooled, compressed air from the intake
manifold is pulled into the cylinder.
• The inlet valves close when the piston begins to move upward on the
compression stroke.
• The air in the cylinder is compressed by the piston.
• As the air is compressed by the piston, the temperature of the air in
the cylinder is heated.
• Fuel is injected into the cylinder when the piston is near the top of the
compression stroke.
• Combustion begins when the fuel mixes with the hot, pressurized air.
• The force of the combustion pushes the piston downward on the
power stroke.
• The exhaust valves are opened as the piston travels upward to the
top of the cylinder.
• The exhaust gases are pushed through the exhaust port into the
exhaust manifold.
• After the piston completes the exhaust stroke, the exhaust valves
close and the cycle begins again.

0013-7
 TM 9-2320-341-10 0013

Each cylinder has two inlet valves (9) and two exhaust valves (10) that are mounted in the
cylinder head.
Exhaust gases from the exhaust manifold flow into the high pressure turbocharger's exhaust
inlet (11).

NOTE
• The hot gases that are expelled from the engine are used to turn the
turbine wheel of the turbocharger.
• The turbine wheel drives the compressor wheel that is used in order
to compress the inlet air that enters the inlet side of the turbocharger.
The exhaust gas exits from the high pressure turbocharger through the high pressure
turbocharger's exhaust outlet (12).

NOTE
The wastegate also prevents excessive boost of the engine during ac-
celeration.
Wastegate (13) is used by the high pressure turbocharger (5) to prevent an overspeed
condition of the turbocharger turbine wheel during engine acceleration.
The wastegate (13) is controlled by the boost pressure that is felt in the air hose assembly
that connects the inlet side of the two turbochargers.

NOTE
• As the diaphragm reacts to high boost pressure, a valve is activated.
• The valve allows exhaust gas to bypass the high pressure
turbocharger's turbine, which effectively controls the speed of the
turbine.
Wastegate pressure line (14) provides the air pressure to the wastegate's diaphragm.

NOTE
• The exhaust gases drive the turbocharger's turbine.
• This energy is used in order to compress the inlet air in the same
manner as the high pressure turbocharger.
The exhaust gases then enter the exhaust inlet (15) for the low pressure turbocharger (2).
The exhaust gases then exit the low pressure turbocharger (2) through the exhaust outlet
(16) into the vehicle's exhaust system.

END OF WORK PACKAGE

0013-8
 TM 9-2320-341-10 0014

OPERATOR MAINTENANCE
CAB

CAB

The cab (1) contains all of the driving controls and gauges, operating controls for some of
the mounted equipment, and adjustable seats for a crew of two. For explanation of cab
controls, refer to vehicle controls and indicators.

Figure 1.

END OF WORK PACKAGE

0014-1
 TM 9-2320-341-10 0015

OPERATOR MAINTENANCE
WHEELS AND TIRES

WHEELS AND TIRES

There are four front and four rear steel disc, 20.00 x 10.00 wheels (1) with 16.00 R20,
tubeless, radial traction, non-directional tires.

1 1

Figure 1.

One spare tire (2) is mounted on top of vehicle.

END OF WORK PACKAGE

0015-1
 TM 9-2320-341-10 0016

OPERATOR MAINTENANCE
HEAVY-DUTY WINCH

HEAVY-DUTY WINCH

The heavy-duty winch assembly (1) is mounted onto chassis frame. It is powered by an
automatic two-speed hydraulic motor which drives the winch drum through a planetary
gearbox.

Figure 1.

END OF WORK PACKAGE

0016-1
TM 9-2320-341-10

CHAPTER 2

OPERATOR
INSTRUCTIONS
 TM 9-2320-341-10 0017

OPERATOR MAINTENANCE
CAB-MOUNTED FOOT CONTROLS

CONTROLS AND INDICATORS INTRODUCTION

This section displays the location and describes the use of cab-mounted foot controls which
are used in the operation of HEMTT series vehicles. Controls and indicators described in
this section are the same for all vehicles, except where otherwise indicated.

LOCATION AND USE OF CONTROLS AND INDICATORS

Know the location and proper use of every control and indicator before operating HEMTT
series vehicles. Separate illustrations with keys are provided for learning about cab-
mounted foot controls.
Table 1. Cab-Mounted Foot Controls.

Control/
Key Indicator Function

CHEM INTER
ALARM 25 6.2
AXLE 22 5.5
15 3.7
11 2.7

8X8 8 2.0

IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0
1 TRAILER
IDLE 2
AIR SUPPLY

AIR BRAKE

2
1

Figure 1.

0017-1
 TM 9-2320-341-10 0017

Table 1. Cab-Mounted Foot Controls. - Continued

Control/
Key Indicator Function

1 Service Brake Applies service brakes. If vehicle is properly coupled to a

Pedal trailer, trailer service brakes will also operate when vehicle
service brakes are applied.

2 Throttle Pedal Controls vehicle speed.

END OF WORK PACKAGE

0017-2
 TM 9-2320-341-10 0018

OPERATOR MAINTENANCE
CAB-MOUNTED HAND CONTROLS

CONTROLS AND INDICATORS INTRODUCTION

This section displays the location and describes the use of cab-mounted hand controls
which are used in the operation of HEMTT series vehicles. Controls and indicators
described in this section are the same for all vehicles, except where otherwise indicated.

LOCATION AND USE OF CONTROLS AND INDICATORS

Know the location and proper use of every control and indicator before operating HEMTT
series vehicles. Separate illustrations with keys are provided for learning about cab-
mounted hand controls.

0018-1
 TM 9-2320-341-10 0018

Table 1. Cab-Mounted Hand Controls.

Control/
Key Indicator Function

Figure 1.

1 Cab Door Win- Rotate driver side regulator counterclockwise to lower left
dow Glass window glass, clockwise to raise left window glass. Rotate
Regulator (one passenger side regulator clockwise to lower right window
on each door) glass, counterclockwise to raise right window glass.

2 Air Horn Chain Pull chain to sound air horn. Release chain to silence air horn.

3 Cab Door In- Pull to open cab door from inside of cab.
side Handle

0018-2
 TM 9-2320-341-10 0018

Table 1. Cab-Mounted Hand Controls. - Continued

Control/
Key Indicator Function

(one on each
door)

4 Cab Door Han- Pull to close cab door from inside of cab.
dle (one on
each door)

5 Drain Plug (one Pull up on lever to remove drain plug and drain liquid from
under both op- floor of cab.
erator seat and
crew seat)

END OF WORK PACKAGE

0018-3
 TM 9-2320-341-10 0019

OPERATOR MAINTENANCE
STEERING COLUMN MOUNTED CONTROLS

CONTROLS AND INDICATORS INTRODUCTION

This section displays the location and describes the use of steering column mounted
controls which are used in the operation of HEMTT series vehicles. Controls and indicators
described in this section are the same for all vehicles, except where otherwise indicated.

LOCATION AND USE OF CONTROLS AND INDICATORS

Know the location and proper use of every control and indicator before operating HEMTT
series vehicles. Separate illustrations with keys are provided for learning about steering
column mounted controls.
Table 1. Steering Column Mounted Controls.

Control/
Key Indicator Function

6
3
1

Figure 1.

1 Emergency To turn on emergency flashers, push in red tab. Pull red tab
Flasher Control out to turn emergency flashers off.

0019-1
 TM 9-2320-341-10 0019

Table 1. Steering Column Mounted Controls. - Continued

Control/
Key Indicator Function

2 Steering Wheel Controls direction of vehicle.

3 Horn Button Sounds electric horn when pressed. Release to silence horn.

4 Turn Signal Push up to signal right turn. Pull down to signal left turn. When
Lever turn is complete, return lever to center position.

5 Headlight Dim- Push in button to switch headlights between high and low
mer Button beam. The high beam indicator on the instrument panel will
illuminate (blue) when high beams are activated, and go out
when low beams are selected. (WP 0020)

6 Trailer Hand- Used to test the trailer brakes. Pull control lever down to apply
brake Control trailer brakes. Push control lever up to release trailer brakes.
Lever

END OF WORK PACKAGE

0019-2
 TM 9-2320-341-10 0020

OPERATOR MAINTENANCE
INSTRUMENT PANEL CONTROLS AND INDICATORS

CONTROLS AND INDICATORS INTRODUCTION

This section displays the location and describes the use of instrument panel controls and
indicators which are used in the operation of HEMTT series vehicles. Controls and
indicators described in this section are the same for all vehicles, except where otherwise
indicated.

LOCATION AND USE OF CONTROLS AND INDICATORS

Know the location and proper use of every control and indicator before operating HEMTT
series vehicles. Separate illustrations with keys are provided for learning about instrument
panel controls and indicators.
Table 1. Instrument Panel Controls and Indicators.

Control/
Key Indicator Function

93.5 mi 25.2V

6.7 mi Trip

2
3 4

Figure 1.

1 Speedometer Displays vehicle speed in miles per hour (MPH) and kilometer
per hour (kmh).

0020-1
 TM 9-2320-341-10 0020

Table 1. Instrument Panel Controls and Indicators. - Continued

Control/
Key Indicator Function

2 Liquid Crystal Displays performance and diagnostic information.

Display (LCD)

3 Mode (M) But- Cycles and selects displays on the LCD.

ton

4 Trip (T) Button Cycles and selects displays on the LCD.

5 7

6 8

93.5 mi 25.2V

6.7 mi Trip

Figure 2.

5 Odometer Displays total vehicle miles since production.

6 Trip / Hrs Dis- Displays either of two drive mode displays (trip display
play shown):

1) Trip - distance vehicle was driven since trip display was

reset.

2) Hrs - total vehicle operating hours.

0020-2
 TM 9-2320-341-10 0020

Table 1. Instrument Panel Controls and Indicators. - Continued

Control/
Key Indicator Function

Trip display can be reset to “0.0” by pressing and holding (T)

button for two or more seconds while in “Trip” display. Vehicle
operating hours (Hrs display) cannot be reset.

7 Battery Voltage Displays battery output in volts (V).

8 Drive Mode Operator may choose between either drive mode display op-
Display tion by momentarily pressing and releasing (T) button.

Displays “Trip” or “Hrs” dependent on drive mode selected.

10
14

11
13
12

Figure 3.

9 Tachometer Displays engine speed in revolutions per minute (RPM x 100).

10 High Engine Illuminates (red) when the engine monitoring system logs a
Coolant Tem- high coolant temperature fault code and will also cause the
perature Indi- check engine indicator (12) to illuminate.
cator

0020-3
 TM 9-2320-341-10 0020

Table 1. Instrument Panel Controls and Indicators. - Continued

Control/
Key Indicator Function

11 Engine Coolant Displays engine coolant temperature in degrees Fahrenheit

Temperature (°F) and Celsius (°C).
Gauge

12 Check Engine Illuminates (amber) when the engine monitoring system logs
Indicator an engine fault code.

13 Engine Oil Displays engine oil pressure in pounds per square inch (psi)
Pressure and bar.
Gauge

14 Low Engine Oil Illuminates (red) when the engine monitoring system logs a
Pressure Indi- low oil pressure fault code and will also cause the check en-
cator gine indicator (12) to illuminate.

22 15

16

17
21

18
20
19

Figure 4.

15 Check Trans- Illuminates (amber) when the transmission monitoring system

mission Indica- indicates a problem.
tor

0020-4
 TM 9-2320-341-10 0020

Table 1. Instrument Panel Controls and Indicators. - Continued

Control/
Key Indicator Function

16 Transmission Displays transmission oil temperature in degrees Fahrenheit

Oil Tempera- (°F) and Celsius (°C).
ture Gauge

17 High Transmis- Illuminates (red) when transmission pump temperature is

sion Tempera- above 482°F (250°C) or torque converter temperature is
ture Indicator above 350°F (177°C).

18 REAR Air Pres- Displays rear air system pressure in pounds per square inch
sure Gauge (psi) and bar.

19 Brake System Illuminates (red) when either FRONT or REAR Air Pressure
Failure (LOW Gauge falls below 70 psi (5 bar), or the brake system con-
AIR) Indicator troller indicates a problem. A buzzer will sound until indicator
goes out.

20 FRONT Air Displays front air system pressure in pounds per square inch
Pressure (psi) and bar.
Gauge

21 Low Fuel Indi- Illuminates (amber) when fuel quantity falls below 1/8 of a full
cator tank.

0020-5
 TM 9-2320-341-10 0020

Table 1. Instrument Panel Controls and Indicators. - Continued

Control/
Key Indicator Function

22 Fuel Gauge Displays fuel remaining in tank.

25 26 27 28 29 30 31 32 33 34 35 36

24

CHEM INTER
ALARM 25 6.2
AXLE 22 5.5
15 3.7
11 2.7

8X8 8 2.0

IN H20 kPa

23
FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2
3 M

HIGH 0
1 TRAILER
IDLE 2
AIR SUPPLY

37 38

Figure 5.

23 Beacon Light Turns beacon lights on/off. Switch only active on M984A4
Switch wrecker.

24 Work Light Turns work lights on/off. Switch only active on M983A4,
Switch M983A4 LET, M984A4, and M1977A4 Models.

25 CHEM ALARM Turns M-8 chemical alarm on/off. Switch only active if M-8
Switch chemical alarm option installed.

26 Left Turn Indi- Flashes (green) when left turn signal or emergency flasher
cator control is activated.

27 Beacon Light Illuminates (green) when Beacon Light Switch is set to on

Indicator position (active on M984A4 Only).

0020-6
 TM 9-2320-341-10 0020

Table 1. Instrument Panel Controls and Indicators. - Continued

Control/
Key Indicator Function

28 Clearance Illuminates (green) when Master Lighting Switch is set to on

Light Indicator position.

29 High Beam In- Illuminates (blue) when headlight high beams are activated.
dicator

30 PARKING Illuminates (red) when PARKING BRAKE Control is applied

BRAKE Indica- (pulled out).
tor

31 Vehicle ABS Illuminates (amber) when vehicle anti-lock braking system

Indicator (ABS) experiences a failure.

32 Trailer ABS In- Illuminates (amber) when trailer anti-lock braking system
dicator (ABS) experiences a failure.

33 Right Turn Indi- Flashes (green) when right turn signal or emergency flasher
cator control is activated.

34 Dimmer Switch Adjusts brightness of backlighting for instrument panel

(Two-Position switches and gauges, transmission range selector, an HVAC
Momentary) panel. Each upward/downward momentary depression of the
switch will increase/decrease panel light intensity by 5%. De-
pressing the dimmer switch upward for 3+ seconds will in-
crease panel light intensity to 100%. Depressing the dimmer
switch downward for 3+ seconds will decrease panel light in-
tensity to 10%.

35 Traction Con- The Traction Control Switch is a three-position switch:

trol Switch
(Three-Posi-
tion)

0020-7
 TM 9-2320-341-10 0020

Table 1. Instrument Panel Controls and Indicators. - Continued

Control/
Key Indicator Function

INTER AXLE - locks inter-axle differentials in front and rear

tandems.

Center (middle) - off. Vehicle is in normal drive mode.

8x8 - engages transfer case drive to front axles.

36 Air Filter Re- Displays condition of air cleaner filter. Shows (red) when filter
striction Indica- becomes clogged. VACUUM INCHES H²O window displays
tor degree of restriction. Push yellow button on bottom of gauge
to reset.

37 PARKING Applies (pull out) and releases (push in) vehicle parking
BRAKE Con- brakes. Automatically applies parking brake when air pres-
trol sure drops below 30 psi (2.1 bar).

38 TRAILER AIR Supplies air to (push in) and shuts off (pull out) air to trailer
SUPPLY Con- brake system. When TRAILER AIR SUPPLY control is ap-
trol plied (pushed in), vehicle PARKING BRAKE Control acti-

0020-8
 TM 9-2320-341-10 0020

Table 1. Instrument Panel Controls and Indicators. - Continued

Control/
Key Indicator Function

vates/deactivates the trailer parking brakes in concert with the

vehicle parking brakes.

40 41 42 43 44 45 46 47 48 49
39

CHEM INTER
ALARM AXLE

8X8

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

M 1
2
3
M

HIGH 0
1
IDLE 2

50 51 52 53 54

Figure 6.

39 AUX HYD Not in use at this time.

Switch

40 HYD ENABLE Turns main hydraulic power on/off.

Switch

41 GPFU Turns gas particle filter unit (GPFU) on/off.

42 Work Light In- Illuminates (green) when Work Light Switch is set to on posi-
dicator tion.

0020-9
 TM 9-2320-341-10 0020

Table 1. Instrument Panel Controls and Indicators. - Continued

Control/
Key Indicator Function

43 OVER SPEED Illuminates (red) when engine speed exceeds 2,450 RPM.
Indicator

44 STOP ENGINE Illuminates (red) when engine oil pressure, manifold air tem-
Indicator perature, and/or engine coolant temperature/fluid level is out-
side safe operating limits.

45 Automatic Flashes (amber) when traction control system is automati-

Traction Con- cally activated during vehicle operation. Illuminates steady
trol Indicator (amber) when traction control is experiencing a fault and/or
(ATC) ABS Disable Switch (50) is set to on position.

46 ABS Disabled Illuminates (amber) when anti-lock disable switch is set to on

Indicator position.

47 SPARE TIRE Illuminates (amber) when spare tire carrier is unlatched.

LOOSE Indica-
tor

48 B.O. SELECT Setting the blackout service select switch to on position dis-
Switch ables the master lighting switch (all functions including brake
lights, turn signals, and emergency flashers), work light
switch, beacon light switch, dome light switch, electric horn,
and reverse alarm.

49 B.O. LIGHTS The blackout lights switch is a three-position switch:

Switch (Three-
Position)

DOWN - off.

0020-10
 TM 9-2320-341-10 0020

Table 1. Instrument Panel Controls and Indicators. - Continued

Control/
Key Indicator Function

CENTER (middle) - Blackout markers located in the compo-

site lights illuminate.

UP - Blackout markers and blackout driving light illuminate.

Blackout stop lights illuminate when Service Brake Pedal is

applied.

50 Anti-Lock Disables vehicle anti-lock brake system. The automatic trac-

Brake System tion control (ATC) indicator (45) will also illuminate steady
(ABS) Disable (amber) when ABS is disabled.
Switch

51 Engine Brake The engine brake high/medium/low switch becomes active

High/Medium/ when the engine brake ON/OFF Switch is set to on position.
Low Switch The amount of engine braking provided is dependant on the
(Three-Posi- position of the engine brake high/medium/low switch:
tion)

(1) - High position (full up) provides maximum engine braking.

(2) - Medium position (center) provides less engine braking.

(3) - Low position (full down) provides least amount of engine

braking.

52 Engine Brake Turns the engine retarder on/off which provides engine brak-
On/Off Switch ing to the vehicle. The amount of engine braking provided is
dependant on the position of the Engine Brake High/Medium/
Low Switch.

0020-11
 TM 9-2320-341-10 0020

Table 1. Instrument Panel Controls and Indicators. - Continued

Control/
Key Indicator Function

53 Master Lighting The Master Lighting Switch is a three-position switch:

Switch (Three-
Position)

DOWN - off

CENTER (middle) - clearance lights and parking lights illumi-

nate.

UP - clearance lights, parking lights, and headlights illumi-

nate.

0020-12
 TM 9-2320-341-10 0020

Table 1. Instrument Panel Controls and Indicators. - Continued

Control/
Key Indicator Function

54 Dome Light Turns dome light in cab overhead on/off.

Switch

55 56 57 58 59 60 61 62

CHEM INTER
ALARM AXLE

8X8

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

M 1
2
3
M

HIGH 0
1
IDLE 2

63 64 65 66 67 68 69

Figure 7.

55 HIGH IDLE In- Illuminates (green) when HIGH IDLE Switch is set to on po-
dicator sition.

56 Charging Sys- Illuminates (amber) when alternator indicates a charging sys-

tem Indicator tem problem.

57 ENGINE Illuminates (green) when Engine Brake On/Off Switch is set

BRAKE ENA- to on position.
BLE Indicator

0020-13
 TM 9-2320-341-10 0020

Table 1. Instrument Panel Controls and Indicators. - Continued

Control/
Key Indicator Function

58 LHS Indicator Illuminates (green) when vehicle load handling system (LHS)
is activated (active on M1120A4 only).

59 8X8 Indicator Illuminates (green) when Traction Control Switch (Three-Po-

sition) is set to 8x8 position and/or TRANSFER CASE shift
lever is positioned to “LO”.

60 Inter-Axle Indi- Illuminates (green) when Traction Control Switch (Three-Po-

cator sition) is set to INTER AXLE position.

61 SPNSN AIR Illuminates (amber) when suspension system air is low.

LOW Indicator

62 MAIN HYD EN- Illuminates (green) when HYD ENABLE Switch is set to on
ABLE position.

63 HIGH IDLE Turns engine high idle on/off.

Switch

64 Windshield The Windshield Wiper Switch is a three-position switch:

Wiper Switch
(Three-Posi-
tion)

DOWN - off.

CENTER (middle) - low speed.

UP - high speed.

0020-14
 TM 9-2320-341-10 0020

Table 1. Instrument Panel Controls and Indicators. - Continued

Control/
Key Indicator Function

65 Windshield With windshield wipers at desired speed, press and hold

Washer Switch Windshield Washer Switch to clean windshield. Release
(Two-Position switch to stop fluid flow.
Momentary)

66 LHS NO Illuminates (amber) when hook arm assembly is not in the

TRANSIT Indi- completely stowed position. The vehicle is not to be driven
cator except in the immediate loading and unloading area when
LHS NO TRANSIT indicator is illuminated (active on
M1120A4 only).

67 LHS OVER Illuminates (amber) when vehicle Load Handling System

LOAD Indicator (LHS) detects an overload condition (active on M1120A4 on-
ly).

68 Ignition Switch This switch provides electrical power to the cab and must be
positioned on to energize the engine start switch.

69 Engine Start Push switch until engine starts, then release.

Switch (Two-
Position Mo-
mentary)

END OF WORK PACKAGE

0020-15
 TM 9-2320-341-10 0021

OPERATOR MAINTENANCE
HEATER COMPARTMENT CONTROLS AND INDICATORS

CONTROLS AND INDICATORS INTRODUCTION

This section displays the location and describes the use of heater compartment controls
and indicators which are used in the operation of HEMTT series vehicles. Controls and
indicators described in this section are the same for all vehicles, except where otherwise
indicated.

LOCATION AND USE OF CONTROLS AND INDICATORS

Know the location and proper use of every control and indicator before operating HEMTT
series vehicles. Separate illustrations with keys are provided for learning about heater
compartment controls and indicators.
Table 1. Heater Compartment Controls and Indicators.

Control/
Key Indicator Function

INTER-
AXLE
8X8

B.O.
B.O.
LIGHTS
EXHAUST
2
SELECT
LER
PULL TO

TRAI SUPPKINLYG
AIR PAR D
FOR
NOT MIDLAN
SUPPLY

PUS O
HT

CHEM
ALARM

AUX
GPPU
3
HYD HYD
ENABLE

M
M
1
2

5
ASS

HIGH
IDLE
nn
ATranlliso
smissio

7
4 6

Figure 1.

0021-1
 TM 9-2320-341-10 0021

Table 1. Heater Compartment Controls and Indicators. - Continued

Control/
Key Indicator Function

1 Transmission R (reverse) - Used to back up vehicle.

Range Selec-
tor

N (neutral) - Used when starting vehicle, parking vehicle, or

if vehicle controls are left unattended while engine is running.

D (drive) - Used for all normal driving conditions. When vehi-

cle is in motion, transmission will upshift/downshift automati-
cally.

UP ARROW (increase) - Once the D (drive) is pressed, press-

ing the (increase) button allows the operator to override the
automatic function of the transmission and shift to a higher
gear range. Pressing the D (drive) button returns the trans-
mission to its automatic function.

DOWN ARROW (decrease) - Once the D (drive) is pressed,

pressing the (decrease) button allows the operator to override
the automatic function of the transmission and shift to a lower
gear range. Pressing the D (drive) button returns the trans-
mission to its automatic function.

MODE - Used for maintenance/troubleshooting procedures.

2 Cabin Floor Regulates amount of airflow directed to the floor vents. This
Vent Control is a rheostat-type control. Turning control CW gradually less-
ens airflow until it stops. Turning control CCW gradually in-
creases airflow to the cabin floor until the vents are completely
open.

0021-2
 TM 9-2320-341-10 0021

Table 1. Heater Compartment Controls and Indicators. - Continued

Control/
Key Indicator Function

3 Cabin Air Di- Directs airflow within the cabin between the midsection and
rectional Con- defroster vents. This is a rheostat-type control with the mid-
trol point position equally distributing airflow between the mid-
section and defroster vents.

4 Vent Control Regulates amount of outside air allowed through the cabin
fresh air vents. This is a rheostat-type control with full CCW
completely closing, and full CW completely opening the cabin
fresh air vents.

5 Heater Tem- Regulates temperature level of the cabin heater. This is a

perature Con- rheostat-type control with full CCW the lowest (coolest) set-
trol ting and full CW the highest (hottest) setting.

6 Fan Control Regulates fan output:

Off - Turn control to the full left position.

Low - One position to the right of off.

Medium - Two positions to the right of off.

High - Turn control to the full right position.

7 Air Condition- Off - Full left position.

ing Control

0021-3
 TM 9-2320-341-10 0021

Table 1. Heater Compartment Controls and Indicators. - Continued

Control/
Key Indicator Function

On - Full right position.

Figure 2.

8 EPLRS Power Supplies electrical power to enhanced position location re-

Outlet porting system (EPLRS).

0021-4
 TM 9-2320-341-10 0021

Table 1. Heater Compartment Controls and Indicators. - Continued

Control/
Key Indicator Function

9 SINCGARS Supplies electrical power to Single Channel Ground and Air-

Power Outlet borne Radio System (SINCGARS).

INTER-
AXLE
8X8

B.O.
SELECT
B.O.
LIGHTS
EXHAUST
LER LY 10

PULL TO
TRAI SUPPKING
AINOTR FORMIDPARLAND

Y
S U P PL
PUSH T O

CHEM
ALARM

GPPU
11
AUX
HYD HYD
ENABLE

M
M
1
2

ASS

HIGH
IDLE

AlTranlissmisonsion

Figure 3.

10 TRANSFER Used to select high (HI) or low (LO) range. Center position is
CASE Shift neutral (NEUT).
Lever

11 Self-Recovery Used to pay out (push lever forward) and take up (pull lever
Winch (SRW) aft) winch cable. Lever will return to neutral (center) position
Lever when released. Lever not included in vehicles without SRW.

END OF WORK PACKAGE

0021-5
 TM 9-2320-341-10 0022

OPERATOR MAINTENANCE
CENTER DASH PANEL CONTROLS

CONTROLS AND INDICATORS INTRODUCTION

This section displays the location and describes the use of dash panel controls which are
used in the operation of HEMTT series vehicles. Controls and indicators described in this
section are the same for all vehicles, except where otherwise indicated.

LOCATION AND USE OF CONTROLS AND INDICATORS

Know the location and proper use of every control and indicator before operating HEMTT
series vehicles. Separate illustrations with keys are provided for learning about dash panel
controls.
Table 1. Center Dash Panel Controls.

Control/
Key Indicator Function

5 3
4

25 6.2
22 5.5
15 3.7
11 2.7
8 2.0

IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

PARKING
BRAKE

TRAILER
AIR SUPPLY

1
2

Figure 1.

1 Operator/Crew Rotate to direct air as desired.

Air Vents

2 12 Volt Recep- Supplies 12V electrical power to cab.

tacle (Two)

0022-1
 TM 9-2320-341-10 0022

Table 1. Center Dash Panel Controls. - Continued

Control/
Key Indicator Function

3 24 Volt Recep- Supplies 24V electrical power to cab.

tacle

4 STE/ICE Re- Receptacle for connecting simplified test equipment/internal

ceptacle combustion engine (STE/ICE).

5 Electronic Di- Used to connect diagnostic equipment for troubleshooting

agnostic Re- vehicle systems.
ceptacle

END OF WORK PACKAGE

0022-2
 TM 9-2320-341-10 0023

OPERATOR MAINTENANCE
OPERATOR AND CREW FOUR-POINT SEATBELT/AIR-RIDE SEAT ADJUSTMENT
CONTROLS

CONTROLS AND INDICATORS INTRODUCTION

This section displays the location and describes the use of operator and crew four-point
seatbelt/air-ride seat adjustment controls which are used in the operation of HEMTT series
vehicles. Controls and indicators described in this section are the same for all vehicles,
except where otherwise indicated.

LOCATION AND USE OF CONTROLS AND INDICATORS

Know the location and proper use of every control and indicator before operating HEMTT
series vehicles. Separate illustrations with keys are provided for learning about operator
and crew four-point seatbelt/air-ride seat adjustment controls.
Table 1. Operator and Crew Four-Point Seatbelt/Air-Ride Seat Adjustment Controls.

Control/
Key Indicator Function

2
1

ADJ.
HEIGHT

5
3
2

6
2
4

Figure 1.

0023-1
 TM 9-2320-341-10 0023

Table 1. Operator and Crew Four-Point Seatbelt/Air-Ride Seat Adjustment

Controls. - Continued

Control/
Key Indicator Function

1 Seatbelt Secures personnel to seat.

2 Seat Connec- Secures seat to cab frame.

tor Straps

3 Height Adjust- Used to adjust seat height.

ment Control

4 Forward/Back- Used to move seat forward or backward on slides.

ward Adjust-
ment Control

5 Ride Adjust- Used to adjust seat tension and ride firmness.

ment Control

6 Retractor Locks seatbelt in event of accident, stows belt when not in

use.

END OF WORK PACKAGE

0023-2
 TM 9-2320-341-10 0024

OPERATOR MAINTENANCE
24V BATTERY DISCONNECT SWITCH

CONTROLS AND INDICATORS INTRODUCTION

This section displays the location and describes the use of 24V Battery Disconnect Switch
which is used in the operation of HEMTT series vehicles. Controls and indicators described
in this section are the same for all vehicles, except where otherwise indicated.

LOCATION AND USE OF CONTROLS AND INDICATORS

Know the location and proper use of every control and indicator before operating HEMTT
series vehicles. Separate illustrations with keys are provided for learning about 24V Battery
Disconnect Switch.

0024-1
 TM 9-2320-341-10 0024

Table 1. 24V Battery Disconnect Switch.

Control/
Key Indicator Function

Figure 1.

1 24V BATTERY When in the ON position, power is available to control mod-

DISCONNECT ules and electrical system. When in OFF position, battery
Switch does not run down due to control module load.

END OF WORK PACKAGE

0024-2
 TM 9-2320-341-10 0025

OPERATOR MAINTENANCE
HYDRAULIC SELECTOR VALVE CONTROL

CONTROLS AND INDICATORS INTRODUCTION

This section displays the location and describes the use of Hydraulic Selector Valve Control
which are used in the operation of HEMTT series vehicles. Controls and indicators
described in this section are the same for all vehicles, except where otherwise indicated.

LOCATION AND USE OF CONTROLS AND INDICATORS

Know the location and proper use of every control and indicator before operating HEMTT
series vehicles. Separate illustrations with keys are provided for learning about Hydraulic
Selector Valve Control.

0025-1
 TM 9-2320-341-10 0025

Table 1. Hydraulic Selector Valve Control.

Control/
Key Indicator Function

Figure 1.

1 Hydraulic Se- Diverts main hydraulic power to/from Heavy-Duty Winch:

lector Valve
Control

Heavy-Duty Winch operation - PULL OUT.

All other operations - PUSH IN (shown).

END OF WORK PACKAGE

0025-2
 TM 9-2320-341-10 0026

OPERATOR MAINTENANCE
TIRE CARRIER PUMP CONTROLS

CONTROLS AND INDICATORS INTRODUCTION

This section displays the location and describes the use of tire carrier pump controls which
are used in the operation of HEMTT series vehicles. Controls and indicators described in
this section are the same for all vehicles, except where otherwise indicated.

LOCATION AND USE OF CONTROLS AND INDICATORS

Know the location and proper use of every control and indicator before operating HEMTT
series vehicles. Separate illustrations with keys are provided for learning about tire carrier
pump controls.

0026-1
 TM 9-2320-341-10 0026

Table 1. Tire Carrier Pump Controls.

Control/
Key Indicator Function

1 2

Figure 1.

1 Hand Pump Receiver for handle which is used in conjunction with direc-
Receptacle tional control lever (2) to manually raise and lower tire carrier.

2 Directional Controls tire carrier direction of movement:

Control Lever

Outboard - LOWER

0026-2
 TM 9-2320-341-10 0026

Table 1. Tire Carrier Pump Controls. - Continued

Control/
Key Indicator Function

Inboard - RAISE

3 Power Control Push in to move tire carrier in direction selected via directional
(momentary) control lever (2). Release to stop movement.

4 Auxiliary Air Accepts outside air source to pneumatically power tire carrier
Fitting during lowering and raising operations.

END OF WORK PACKAGE

0026-3
 TM 9-2320-341-10 0027

OPERATOR MAINTENANCE
SUSPENSION DUMP VALVE CONTROL

CONTROLS AND INDICATORS INTRODUCTION

This section displays the location and describes the use of Suspension Dump Valve Control
which is used in the operation of HEMTT series vehicles. Controls and indicators described
in this section are the same for all vehicles, except where otherwise indicated.

LOCATION AND USE OF CONTROLS AND INDICATORS

Know the location and proper use of every control and indicator before operating HEMTT
series vehicles. Separate illustrations with keys are provided for learning about Suspension
Dump Valve Control.
Table 1. Suspension Dump Valve Control.

Control/
Key Indicator Function

Figure 1.

0027-1
 TM 9-2320-341-10 0027

Table 1. Suspension Dump Valve Control. - Continued

Control/
Key Indicator Function

1 Suspension Inflates/deflates vehicle air suspension system:

Dump Valve
Control

DUMP (deflate) - Push in.

SERVICE (inflate) - Pull out.

END OF WORK PACKAGE

0027-2
 TM 9-2320-341-10 0028

OPERATOR MAINTENANCE
HEAVY-DUTY WINCH CONTROLS

CONTROLS AND INDICATORS INTRODUCTION

This section displays the location and describes the use of heavy-duty winch controls which
are used in the operation of HEMTT series vehicles. Controls and indicators described in
this section are the same for all vehicles, except where otherwise indicated.

LOCATION AND USE OF CONTROLS AND INDICATORS

Know the location and proper use of every control and indicator before operating HEMTT
series vehicles. Separate illustrations with keys are provided for learning about heavy-duty
winch controls.

0028-1
 TM 9-2320-341-10 0028

Table 1. Heavy-Duty Winch Controls.

Control/
Key Indicator Function

2
3

4
5

8
7

Figure 1.

1 Winch Control Reels in/pays out heavy-duty winch cable.

Lever

Push lever inboard to reel heavy-duty winch cable in.

0028-2
 TM 9-2320-341-10 0028

Table 1. Heavy-Duty Winch Controls. - Continued

Control/
Key Indicator Function

Pull lever outboard to pay out heavy-duty winch cable.

2 Winch KickOut Engage/disengage heavy-duty winch KickOut.

Control

Engage (push in) - This will engage heavy-duty winch KickOut

which disengages winch gears, allowing cable drum to spin
freely.

Disengage (pull out) - This will disengage heavy-duty winch

KickOut which engages winch gears. Cable drum will only
move via input to winch control lever (manual or remote-con-
trol) under power.

3 Cable Hold Engage/disengage heavy-duty winch cable hold down as-

Down Control sembly.

Engage (push in) - This will engage heavy-duty winch cable

hold down.

Disengage (pull out) - This will disengage heavy-duty winch

cable hold down.

4 HD WINCH Turns power to remote-control receptacle ON/OFF.

REMOTE
POWER
Switch

5 Remote-Con- Allows operator to hook remote-control unit into heavy-duty

trol Unit Recep- winch system.
tacle

0028-3
 TM 9-2320-341-10 0028

Table 1. Heavy-Duty Winch Controls. - Continued

Control/
Key Indicator Function

6 Remote-Con- Allows operator to control heavy-duty winch away from vehi-

trol Unit cle.

7 High Idle Turns engine high idle circuit ON/OFF.

Switch (Re-
mote-Control
Unit)

8 Winch Control Reels in/pays out heavy-duty winch cable.

Lever (Re-
mote-Control
Unit)

Push inboard (IN) to reel heavy-duty winch cable in.

Pull outboard (OUT) to pay heavy-duty winch cable out.

END OF WORK PACKAGE

0028-4
 TM 9-2320-341-10 0029

OPERATOR MAINTENANCE
RIFLE STOWAGE MOUNT

CONTROLS AND INDICATORS INTRODUCTION

This section displays the location and describes the use of Rifle Stowage Mounts which are
used in the operation of HEMTT series vehicles. Controls and indicators described in this
section are the same for all vehicles, except where otherwise indicated.

LOCATION AND USE OF CONTROLS AND INDICATORS

Know the location and proper use of every control and indicator before operating HEMTT
series vehicles. Separate illustrations with keys are provided for learning about Rifle
Stowage Mount.

0029-1
 TM 9-2320-341-10 0029

Table 1. Rifle Stowage Mount.

Control/
Key Indicator Function

Figure 1.

1 Lower Rifle Holds butt of rifle.

Mount

0029-2
 TM 9-2320-341-10 0029

Table 1. Rifle Stowage Mount. - Continued

Control/
Key Indicator Function

2 Rifle Mount Secures heat guard of rifle against top rifle mount.
Handle

3 Top Rifle Holds heat guard of rifle.

Mount

END OF WORK PACKAGE

0029-3
 TM 9-2320-341-10 0030

OPERATOR MAINTENANCE
FIFTH WHEEL CONTROLS

CONTROLS AND INDICATORS INTRODUCTION

This section displays the location and describes the use of Fifth Wheel Controls which are
used in the operation of HEMTT series vehicles. Controls and indicators described in this
section are the same for all vehicles, except where otherwise indicated.

LOCATION AND USE OF CONTROLS AND INDICATORS

Know the location and proper use of every control and indicator before operating HEMTT
series vehicles. Separate illustrations with keys are provided for learning about Fifth Wheel
Controls.
Table 1. Fifth Wheel Controls.

Control/
Key Indicator Function

Figure 1.

1 Primary Lock Pull out (push up and hook tab to lock) to open fifth wheel
Release coupler jaws. Push in to close fifth wheel coupler jaws. Pri-
mary lock release will not function when secondary lock re-
lease is locked.

0030-1
 TM 9-2320-341-10 0030

Table 1. Fifth Wheel Controls. - Continued

Control/
Key Indicator Function

2 Secondary Pull out to unlock fifth wheel coupler jaws. Allows primary lock
Lock Release release to open/close fifth wheel coupler jaws.

3 Lockout Lockouts (one each on driver side and passenger side of fifth
wheel) have three settings:

FULL LOCK - Inhibits the fifth wheel from pivoting (rolling)

side to side.

HALF LOCK - Fifth wheel is able to pivot (roll) three degrees

side to side.

NO LOCK - Fifth wheel is able to pivot (roll) its full range of

six degrees side to side.

END OF WORK PACKAGE

0030-2
 TM 9-2320-341-10 0031

OPERATOR MAINTENANCE
OPERATE WINDSHIELD WIPERS/WASHER

INITIAL SETUP:

Not Applicable

OPERATE WINDSHIELD WIPERS

NOTE
24V battery disconnect switch must be positioned to ON (WP 0074) to
operate windshield wipers.
1. Ensure ignition switch (1) is set to on position.

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

2 1

Figure 1.

2. Press three-position windshield wiper switch (2) up one position for low speed, or up
two positions for high speed as desired.
3. Press three-position windshield wiper switch (2) all the way down to stop wipers.

OPERATE WINDSHIELD WASHER

NOTE
24V battery disconnect switch must be positioned to ON (WP 0074) to
operate windshield wipers.

0031-1
 TM 9-2320-341-10 0031

1. Set ignition switch (1) to on position.

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

2 1

Figure 2.

2. Push in and hold windshield washer switch (2) to spray cleaning fluid on windshield.
3. Release windshield washer switch (2) to stop spray.

END OF TASK

END OF WORK PACKAGE

0031-2
 TM 9-2320-341-10 0032

OPERATOR MAINTENANCE
OPERATE CAB TEMPERATURE CONTROLS

INITIAL SETUP:

Not Applicable

OPERATE PERSONNEL HEATER

NOTE
• If heater does not blow hot air, ensure heater valves are open.
• Air temperature is controlled by position of temperature control
switch.
• Turn temperature control switch CW to increase temperature.
• Turn temperature control switch CCW to decrease temperature.
1. Position temperature control switch (1) to desired setting.

0032-1
 TM 9-2320-341-10 0032

4
5
1

INTER-
AXLE
8X8

2
B.O.
LIGHTS
B.O.
EXHAUST
SELECT
LER

PULL TO
TRAI SUPPKINLYG
AIR PAR D
FOR
NOT MIDLAN

S UPPLY
PUS O
HT

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
1
2

ASS

HIGH
IDLE
nn
ATranlliso
smissio

Figure 1.

2. Set fan switch (2) to desired position:

Off - full CCW.
Low - one position CW from off.
Medium - two positions CW from off.
High - full CW.
3. Position vent control switch (3) as desired to control outside airflow for cab ventilation.
Full CCW shuts outside air ventilation off.
4. Position mid-level/defrost vent control switch (4) as desired to control airflow direction:
a. Turning the mid-level/defrost vent control switch (4) full CCW position turns
maximum airflow to defrost vent, and shuts off all airflow to mid-level vents.
b. Turning the mid-level/defrost vent control switch (4) CW causes a relative
distribution of airflow between defrost and mid-level vents.

0032-2
 TM 9-2320-341-10 0032

c. Turning the mid-level/defrost vent control switch (4) full CW turns maximum airflow
to mid-level vents and shuts off all airflow to defrost vents.
5. Position floor vent control switch (5) as desired to control airflow to the floor vents:
a. Turning the floor vent control switch (5) full CCW directs maximum airflow to floor
vents.
b. Turning the floor vent control switch (5) CCW causes a relative decrease in airflow.
c. Turning the floor vent control switch (5) full CW shuts airflow to foot vents off.
6. When personnel heater is no longer required:
a. Position temperature control switch (1) to desired setting.
b. Set FAN switch (2) to OFF (full CCW).
c. Adjust vent switches (3, 4, and 5) as desired.

OPERATE WINDSHIELD DEFROST

NOTE
If windshield defrost does not blow hot air, ensure heater valves are open.
1. Turn mid-level/defrost vent control switch (4) to full CCW position.

0032-3
 TM 9-2320-341-10 0032

4
5
1

INTER-
AXLE
8X8

2
B.O.
LIGHTS
B.O.
EXHAUST
SELECT
LER

PULL TO
TRAI SUPPKINLYG
AIR PAR D
FOR
NOT MIDLAN

S UPPLY
PUS O
HT

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
1
2

ASS

HIGH
IDLE
nn
ATranlliso
smissio

Figure 2.

2. Position temperature control switch (1) to desired setting.

3. Set fan switch (2) to desired setting:
a. Off - full CCW.
b. Low - one position CW from off.
c. Medium - two positions CW from off.
d. High - full CW.
4. When windshield defrost is no longer required:
a. Position mid-level/defrost vent control switch (4) to desired setting.
b. Position temperature control switch (1) to desired setting.
c. Set FAN switch (2) to off.

0032-4
 TM 9-2320-341-10 0032

OPERATE AIR CONDITIONER

NOTE
• Close heater valves to improve the efficiency of cabin air
conditioning.
• Closing the heater valves disables cabin heat.
1. Set air conditioning control switch (6) to on (full CW).

4
5
1

INTER-
AXLE
8X8

2
B.O.
LIGHTS
B.O.
EXHAUST
SELECT
LER
PULL TO

TRAI SUPPKINLYG
AIR FOR PARLAND
S UPPLY

NOT MID
PUS O
HT

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
1
2

ASS

HIGH
IDLE
nn
ATranlliso
smissio

Figure 3.

2. Set fan switch (2) to desired setting:

a. Off - full CCW.
b. Low - one position CW from off.
c. Medium - two positions CW from off.

0032-5
 TM 9-2320-341-10 0032

d. High - full CW.

3. Position vent control switch (3) as desired to control outside airflow for cab ventilation.
Full CCW shuts outside air ventilation off.
4. Position mid-level/defrost vent control switch (4) as desired to control airflow direction:
a. Turning the mid-level/defrost vent control switch (4) full CCW position turns
maximum airflow to defrost vent, and shuts off all airflow to mid-level vents.
b. Turning the mid-level/defrost vent control switch (4) CW causes a relative
distribution of airflow between defrost and mid-level vents.
c. Turning the mid-level/defrost vent control switch (4) full CW turns maximum airflow
to mid-level vents and shuts off all airflow to defrost vents.
5. Position floor vent control switch (5) as desired to control airflow to the floor vents:
a. Turning the floor vent control switch (5) full CCW directs maximum airflow to floor
vents.
b. Turning the floor vent control switch (5) CW causes a relative decrease in airflow.
c. Turning the floor vent control switch (5) full CW shuts airflow to foot vents off.
6. When air conditioner is no longer required:
a. Set air conditioning control switch (6) to off (full CCW).
b. Position temperature control switch (1) to desired setting.
c. Set FAN switch (2) to OFF (full CCW).
d. Adjust vent switches (3, 4, and 5) as desired.

END OF TASK

END OF WORK PACKAGE

0032-6
 TM 9-2320-341-10 0033

OPERATOR MAINTENANCE
OPERATE FIRE EXTINGUISHER

INITIAL SETUP:

Not Applicable

REMOVE FIRE EXTINGUISHER FROM CAB

NOTE
Fire extinguisher is located on rear of heater compartment between driver
and passenger seats.
1. Pull up top clamp (1) and disengage from top hook (2).

4 2
6

Figure 1.
2. Pull up bottom clamp (3) and disengage from bottom hook (4).
3. Remove fire extinguisher (5) from bracket (6).

0033-1
 TM 9-2320-341-10 0033

EXTINGUISH FIRE

NOTE
• Fire extinguisher is a dry chemical type. Refer to MSDS for specific
extinguisher warnings and cautions for use.
• Remember the word “PASS” to operate fire extinguisher:
.
1. Hold fire extinguisher (1) upright and pull safety pin (2) to break plastic tie (3).

Figure 2.

2. Point nozzle (4) at base of fire.

3. Press down on stop lever (5) and spray discharge in a side-to-side motion at base of
fire.
4. Let go of stop lever (5) when fire is out.
5. Notify field level maintenance to replace fire extinguisher.

INSTALL FIRE EXTINGUISHER IN CAB

1. Put neck of fire extinguisher (1) on bracket (2).

0033-2
 TM 9-2320-341-10 0033

6 4
2

Figure 3.
2. Hook top clamp (3) on top hook (4) and push top clamp (3) down, tightening strap.
3. Hook bottom clamp (5) on bottom hook (6) and push bottom clamp (5) down, tightening
strap.

END OF TASK

END OF WORK PACKAGE

0033-3
 TM 9-2320-341-10 0034

OPERATOR MAINTENANCE
OPERATE ACCESS LADDER

INITIAL SETUP:

Not Applicable

INSTALL ACCESS LADDER

NOTE
M983 and M983 LET stow access ladder in same location. M983 shown.
1. Pull two pins (1) from brackets (2).

1
2

Figure 1.

2. Remove access ladder (3) from walkway grating (4).

NOTE
Front skid plate has two sets of mounting holes centered on both driver
side and passenger side windshield.

0034-1
 TM 9-2320-341-10 0034

3. Install access ladder (3) hooks (5) in front (driver or passenger side) skid plate mounting
holes (6), driver side charge air cooler mounting holes (8), or passenger side radiator
grill mounting holes (7), as required.

7 8
5
3

Figure 2.

STOW ACCESS LADDER

NOTE
M983 and M983 LET stow access ladder in same location. M983 shown.
1. Place access ladder (1) in brackets (2).

0034-2
 TM 9-2320-341-10 0034

3
2

Figure 3.

2. Install two pins (3) into brackets (2) on walkway grating (4).

END OF TASK

END OF WORK PACKAGE

0034-3
 TM 9-2320-341-10 0035

OPERATOR MAINTENANCE
OPERATE DRAIN PLUG

INITIAL SETUP:

Not Applicable

REMOVE DRAIN PLUG

NOTE
There are two drain plugs. One located on each side of cab floor, just
below operator/crew seats.
1. Pull up on lever (1).

Figure 1.

2. Remove drain plug (2) to drain any liquid from floor of cab.

INSTALL DRAIN PLUG

1. Push drain plug (2) in opening on cab floor.

0035-1
 TM 9-2320-341-10 0035

Figure 2.

2. Press down on lever (1) to secure drain plug (2).

END OF TASK

END OF WORK PACKAGE

0035-2
 TM 9-2320-341-10 0036

OPERATOR MAINTENANCE
OPERATE AIR SUSPENSION DUMP VALVE

INITIAL SETUP:

Not Applicable

DUMP (DEFLATE) AIR SUSPENSION

CAUTION
• Ensure all tools and equipment are removed from 'pinch points' in
suspension as vehicle will lower to suspension stops. Failure to
comply may result in damage to equipment.
• Never operate vehicle with suspension dumped (deflated) during
normal driving operations. Failure to comply may result in damage to
equipment.
• Do not dump (deflate) vehicle air suspension system when spare tire
is attached to tire carrier and in contact with the ground. Failure to
comply may result in damage to equipment.

NOTE
Refer to operate air suspension ball valves (WP 0040) for further infor-
mation on ball valve operation.
1. Position all required (air springs to be dumped) ball valves to ON. (WP 0040)

NOTE
Suspension dump valve requires 70 psi (4.8 bar) of air in vehicle rear air
system to function. If rear air system has less than 70 psi (4.8 bar) reading
on rear air pressure gauge, suspension dump valve will not dump (de-
flate) the vehicle air suspension system.
2. Ensure rear air pressure gauge (1) reads at least 70 psi (4.8 bar).

0036-1
 TM 9-2320-341-10 0036

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 1.

3. If rear air pressure gauge (1) reads less that 70 psi (4.8 bar), start engine (WP 0044)
and allow air system to recharge.

NOTE
• The operator can choose to dump (deflate) one to all four zones of
air springs by positioning appropriate ball valves to OFF (on air
springs desired to remain inflated) prior to pushing in suspension
dump valve button.
• Suspension dump valve will not dump (deflate) any suspension air
springs that have ball valves positioned OFF.
4. Remove pin (2) from suspension dump valve, and push suspension dump valve button
(3) in.

0036-2
 TM 9-2320-341-10 0036

Figure 2.

NOTE
• All air springs with ball valves positioned ON will dump (deflate).
• Suspension dump valve button will remain in PUSH TO DUMP
position.
5. (If required) tag suspension dump valve to ensure no personnel service (inflate) air
suspension.

SERVICE (INFLATE) AIR SUSPENSION

CAUTION
• Ensure vehicle has adequate overhead clearance prior to servicing
(inflating) air suspension bags. Vehicle will raise approximately 4 in.
(10 cm) when air springs transition from deflated to fully inflated.
Failure to comply may result in damage to equipment.
• Never operate vehicle with suspension dumped (deflated) during
normal driving operations. Failure to comply may result in damage to
equipment.

0036-3
 TM 9-2320-341-10 0036

NOTE
• If possible, start engine (WP 0044) and idle during air suspension
servicing.
• Refer to operate air suspension ball valves (WP 0040) for further
information on ball valve operation.
1. Ensure all (air springs to be serviced) ball valves are positioned ON. (WP 0040)

NOTE
Servicing (inflating) a dumped (deflated) suspension system requires ap-
proximately 70 psi (4.8 bar) of air from vehicle rear air system. If rear air
system has less than 70 psi (4.8 bar) reading on rear air pressure gauge,
suspension may not fully inflate.
2. Ensure rear air pressure gauge (1) reads at least 70 psi (4.8 bar).

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 3.

3. If rear air pressure gauge (1) reads less that 70 psi (4.8 bar), start vehicle and allow air
system to recharge.

NOTE
• The operator can choose to service (inflate) one to all four zones of
air springs by positioning appropriate ball valves to OFF (on air
springs desired to remain deflated) prior to pushing in suspension
dump valve button.
• Suspension dump valve will not service (inflate) any suspension air
springs that have ball valves positioned OFF.

0036-4
 TM 9-2320-341-10 0036

4. Pull suspension dump valve button (3) out. All air springs with ball valves (1) positioned
ON will service (inflate). Insert pin (2) in suspension dump valve to lock suspension
dump valve button (3) in OUT FOR SERVICE position.

Figure 4.

CAUTION
Vehicle should never be operated with any zone of vehicle air suspension
dumped (deflated). Failure to comply may result in damage to equipment.
5. Ensure that SPSN LOW AIR indicator (4) has gone out prior to resuming normal vehicle
operation. If SPSN LOW AIR indicator (4) is illuminated, there may be at least one zone
of air suspension system that has a ball valve in OFF position:

0036-5
 TM 9-2320-341-10 0036

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 5.

a. Complete Steps (1) and (2) of this procedure again.

b. If SPSN LOW AIR indicator (4) remains illuminated, notify field level maintenance.

END OF TASK

END OF WORK PACKAGE

0036-6
 TM 9-2320-341-10 0037

OPERATOR MAINTENANCE
HEAVY-DUTY WINCH OPERATION USING VEHICLE MOUNTED (MANUAL)
CONTROLS

INITIAL SETUP:

Not Applicable

PREPARE TO OPERATE HEAVY-DUTY WINCH

WARNING

• Due to reduced field of vision when using the vehicle mounted

(manual) controls, the remote-control unit should always be used
when operating the heavy-duty winch. The vehicle mounted (manual
controls) should only be used as a last resort (remote-control lost or
inoperable). Failure to comply may result in injury or death to
personnel.
• Use of vehicle mounted (manual) controls requires an additional
safety observer whenever the heavy-duty winch is being operated.
Failure to comply may result in injury or death to personnel.
• Excessive noise levels are present any time the heavy-duty winch is
operating. Wear single hearing protection (earplugs or equivalent)
while working around equipment when it is running. Failure to comply
may result in injury or death to personnel. Seek medical aid should
you suspect a hearing problem.

NOTE
This procedure is a two soldier task.
1. Start engine. (WP 0044)
2. Position vehicle for straight pull and on solid ground so tires have good traction.
3. Set transmission range selector (1) to N (neutral).

0037-1
 TM 9-2320-341-10 0037

4 2
3
INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT
ILER

PULL TO
TRA SUPPLYING
AIR PARKND
FOR

LY
NOT MIDLA

SU PP
PU S H T O

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
12

ASS

HIGH
IDLE

isoissionn
AllTransm

Figure 1.

NOTE
Dashboard parking brake indicator will illuminate when PARKING
BRAKE control is applied.
4. Pull out PARKING BRAKE control (2).
5. Set HYD ENABLE switch (3) to off position. MAIN HYD ENABLE indicator (4) will go
out.

CAUTION
Do not move hydraulic selector valve control while HYD ENABLE switch
is set to on position. Failure to comply may result in damage to hydraulic
equipment.
6. Pull out hydraulic selector valve control (5) for heavy-duty winch operation.

0037-2
 TM 9-2320-341-10 0037

Figure 2.

7. Set HYD ENABLE switch (3) to on position. MAIN HYD ENABLE indicator (4) will
illuminate.

4
3
INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT
ILER
PULL TO

TRA SUPPLYING
AIR PARKND
FOR
LY

NOT MIDLA
SU PP

PU S H T O

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
12

ASS

HIGH
IDLE

isoissionn
AllTransm

Figure 3.

0037-3
 TM 9-2320-341-10 0037

PAY OUT CABLE AND CONNECT TO EQUIPMENT

WARNING

Using remote-control unit and operating heavy-duty winch away from ve-
hicle will lessen the possibility of injury or death to personnel if winch cable
separates under tension.

CAUTION
• Do not allow other vehicles to run over heavy-duty winch cable.
Heavy-duty winch cable may be damaged. Failure to comply may
result in damage to equipment.
• Cable Hold Down control should never be engaged (pushed in) when
winch cable is being payed out under power. Failure to comply may
result in damage to equipment.

NOTE
• The operator will be limited to slow speed only for heavy-duty winch
operations as high idle (which enables fast speed) is only available
via the remote-control unit or cabin high idle switch.
• It is not advisable for the operator to use the cabin high idle switch
during heavy-duty winch operations, as it will decrease operator's
situational awareness by leaving the heavy-duty winch vehicle
mounted (manual) controls to turn high idle ON/OFF via the cabin
high idle switch.
1. Disengage (pull out) Cable Hold Down control (1).

0037-4
 TM 9-2320-341-10 0037

2
1

Figure 4.

CAUTION
Winch KickOut control should never be engaged (pushed in) under load.
Failure to comply may result in damage to equipment.
2. Disengage (pull out) Winch KickOut control (2).
3. Unhook clevis retention chain (3) from clevis (4).

0037-5
 TM 9-2320-341-10 0037

Figure 5.

WARNING

• Heavy-duty winch operator shall ensure all personnel keep hands

and feet clear of heavy-duty winch during operation. Failure to comply
may result in injury or death to personnel.
• Keep all personnel clear of area when tension is on winch cable.
Winch cable could come loose or break. Failure to comply may result
in injury or death to personnel.
• Always wear protective gloves when handling winch cable. Never let
cable run through hands. Frayed cables can cut severely. Failure to
comply may result in injury or death to personnel.
• Never operate winch with less than five wraps of cable on winch
drum. Failure to comply may result in injury or death to personnel.

0037-6
 TM 9-2320-341-10 0037

CAUTION
Ensure assistant routes winch cable to avoid snag hazards on tractor
vehicle and trailer. Failure to comply may result in damage to equipment.
4. Pull winch control lever (5) to pay out winch cable (6) while assistant routes winch cable
(6) to equipment. Release winch control lever (5) when it is determined ample winch
cable (6) is available for connection to equipment.

2
1

7
6

Figure 6.

CAUTION
Always be sure there are at least five wraps of cable on winch drum. If
there are less than five wraps of cable on winch drum, cable may come
loose and damage equipment.

NOTE
Ensure weight of equipment and amount of winch cable left on winch does
not go over pull capacity (refer to FM 4-30.31 (WP 0146) and Heavy-Duty
Winch Pull Capacity Table below).
5. Check that there are at least five wraps of winch cable (6) on winch (7). If there are not
at least five wraps of winch cable (6) left on winch (7), move tractor vehicle closer to
equipment and continue loading or shut down winch (7).

0037-7
 TM 9-2320-341-10 0037

Table 1. Heavy-Duty Winch Pull Capacity.

CABLE LAYER CABLE ON DRUM (ft.) CAPACITY (lbs)

1 37 45,000

2 81 37,200

3 133 31,700

4 150 27,700

6. Connect winch cable (6) to equipment.

LOAD EQUIPMENT

WARNING

Using remote-control unit and operating heavy-duty winch away from ve-
hicle will lessen the possibility of injury or death to personnel if winch cable
separates under tension.
1. Engage (push in) Cable Hold Down control (1).

0037-8
 TM 9-2320-341-10 0037

2
1

Figure 7.

CAUTION
Winch KickOut control should never be engaged (pushed in) under load.
Failure to comply may result in damage to equipment.
2. Disengage (pull out) Winch KickOut control (2).
3. Ensure loading area is clear of personnel.

WARNING

• Heavy-duty winch operator shall ensure all personnel keep hands

and feet clear of heavy-duty winch during operation. Failure to comply
may result in injury or death to personnel.
• Keep all personnel clear of area when tension is on winch cable.
Winch cable could come loose or break. Failure to comply may result
in injury or death to personnel.

0037-9
 TM 9-2320-341-10 0037

• Always wear protective gloves when handling winch cable. Never let
cable run through hands. Frayed cables can cut severely. Failure to
comply may result in injury or death to personnel.
• Never operate winch with less than five wraps of cable on winch
drum. Failure to comply may result in injury or death to personnel.

CAUTION
Gradually apply power to avoid high impact loading of winch cable.

NOTE
Maintaining a safe distance, visually recheck your rigging once light ten-
sion (slack taken out of winch cable) is applied to winch cable.
4. Push in winch control lever (3) slightly to slowly tighten winch cable (4).

NOTE
• Expect vehicle air suspension system to continuously adjust during
loading procedure. This is a normal condition.
• Assistant should be in a position to safely monitor the loading
operation and advise the operator of progress.
5. Push in winch control lever (3) and load equipment.

NOTE
Pull winch control lever just enough to allow adequate slack in winch ca-
ble to disconnect from equipment.
6. When equipment is fully loaded, pull out winch control lever (3).

DISCONNECT WINCH CABLE AND STOW

1. Ensure Cable Hold Down control (1) is engaged (pushed in).

0037-10
 TM 9-2320-341-10 0037

1
2 6 5

3
7

Figure 8.

2. Disconnect winch cable (2) from equipment.

CAUTION
Winch KickOut control should never be engaged (pushed in) under load.
Failure to comply may result in damage to equipment.
3. Disengage (pull out) Winch KickOut control (3).

0037-11
 TM 9-2320-341-10 0037

WARNING

• Heavy-duty winch operator shall ensure all personnel keep hands

and feet clear of heavy-duty winch during operation. Failure to comply
may result in injury or death to personnel.
• Keep all personnel clear of area when tension is on winch cable.
Winch cable could come loose or break. Failure to comply may result
in injury or death to personnel.
• Always wear protective gloves when handling winch cable. Never let
cable run through hands. Frayed cables can cut severely. Failure to
comply may result in injury or death to personnel.
• Never operate winch with less than five wraps of cable on winch
drum. Failure to comply may result in injury or death to personnel.

CAUTION
• Ensure assistant routes winch cable to avoid snag hazards on tractor
vehicle and semitrailer. Failure to comply may result in damage to
equipment.
• Ensure tension is kept on winch cable at all times during winch cable
retrieval. This accompanied with guidance from the assistant will
ensure the winch cable gets evenly wrapped onto winch drum.
• Both operator and assistant should ensure that winch cable wraps
properly and evenly onto winch drum. Failure to comply may result
in damage to equipment.
4. Push in winch control lever (4) as assistant routes winch cable (2) onto winch drum (5).
5. Once winch cable (2) is completely and evenly wrapped onto winch drum (5), release
winch control lever (4).
6. Assistant connects clevis retention chain (6) to clevis (7).
7. Set HYD ENABLE switch (8) to off position. MAIN HYD ENABLE indicator (9) will go
out.

0037-12
 TM 9-2320-341-10 0037

9
8
INTER-
AXLE
8X8

B.O.
LIGHTS
B.O. EXHAUST
SELECT
ILER

PULL TO
TRA SUPPLYING
AIR PARKND
FOR

UPPLY
NOT MIDLA

PUS H T

OS
CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
12

ASS

HIGH
IDLE

isoissionn
AllTransm

Figure 9.

CAUTION
• The operator should always push in hydraulic selector valve control
when use of the heavy-duty winch is no longer required to ensure the
heavy-duty winch won't accidentally moved during other operations.
• Do not move hydraulic selector valve control while HYD ENABLE
switch is set to on position. Failure to comply may result in damage
to hydraulic equipment.
8. Push in hydraulic selector valve control (10) for all tractor vehicle operations that do not
require use of heavy-duty winch.

0037-13
 TM 9-2320-341-10 0037

10

Figure 10.

END OF TASK

END OF WORK PACKAGE

0037-14
 TM 9-2320-341-10 0038

OPERATOR MAINTENANCE
OPERATE TIRE CARRIER

INITIAL SETUP:

Not Applicable

LOWER TIRE CARRIER

CAUTION
• Ensure the passenger side of the vehicle has 6 ft. (1.83 m) of
clearance from the battery box forward to accommodate the tire
carrier lowering or damage to equipment may occur.
• Do not dump (deflate) vehicle air suspension system (WP 0036)
when spare tire is attached to tire carrier and in contact with the
ground. Failure to comply may result in damage to equipment.
• Do not add a significant amount of weight to the vehicle when spare
tire is attached to tire carrier and in contact with the ground. Failure
to comply may result in damage to equipment.

NOTE
• This procedure is a two soldier task.
• Lowering the tire carrier requires approximately 10 psi (1 bar) of air
from the vehicle rear air system.
1. Remove access ladder from stowage and connect to passenger side front fender. (WP
0034)
2. Disconnect safety pin (1) from right lock rod (2). Leave safety pin (1) hang from its
lanyard (3).

0038-1
 TM 9-2320-341-10 0038

3 1 2

Figure 1.

CAUTION
The tire carrier lock rods are a snag hazard to the movement of the tire
carrier and must be properly stowed in stowage brackets prior to lowering
the tire carrier. Failure to properly stow tire carrier lock rods prior to low-
ering operation may result in damage to equipment.
3. Turn left lock rod (4) CCW until enough slack is made to push left lock rod (4) up and
into its stowage bracket (5).

0038-2
 TM 9-2320-341-10 0038

Figure 2.

4. Turn right lock rod (6) CCW until enough slack is made to push right lock rod (6) up and
into its stowage bracket (7).

Figure 3.

0038-3
 TM 9-2320-341-10 0038

WARNING

If tire carrier is in any position other than full up and locked (tire carrier
latch engaged) or resting on ground, only tire carrier pump operator
should be within six feet (1.83 m) of passenger side of vehicle from battery
box forward. Failure to comply may result in personnel being struck by
tire carrier/spare tire, causing injury or death to personnel.
5. Ensure safety area clear of personnel and equipment. Assistant will stand outside the
safety area and ensure no personnel wander into safety area while lowering operation
is taking place.

SAFETY
AREA

6 FT (1.83m) SAFETY AREA

Figure 4.

6. Set directional control lever (8) to LOWER (pointing outboard) position.

0038-4
 TM 9-2320-341-10 0038

Figure 5.

NOTE
The operator will notice a small amount of oil being expelled with the air
from the tire carrier pump each time it cycles, this is a normal condition.
7. Press and hold power control (9). The tire carrier pump cyclic rate will be rapid at first,
and then slow noticeably. As cyclic rate slows, the operator should notice the tire carrier
begin to move.

CAUTION
Once tire is in contact with the ground, do not press power control with
directional control lever in LOWER (pointing outboard) position. This may
put undue stress on tire carrier. Failure to comply may result in damage
to equipment.

0038-5
 TM 9-2320-341-10 0038

NOTE
The tire carrier can be stopped at any time during lowering operations by
releasing the power control and moving the directional control lever to
RAISE (pointing inboard) position.
8. Once tire carrier has passed vertical (approximately 6 in. [15.24 cm] of movement),
release power control (9) and allow the tire carrier to lower on its own until tire contacts
ground.
9. Set directional control lever (8) to RAISE (pointing inboard) position.

RAISE TIRE CARRIER

CAUTION
Ensure the passenger side of the vehicle has 6 ft. (1.83 m) of clearance
from the battery box forward to accommodate the tire carrier raising or
damage to equipment may occur.

NOTE
• This procedure is a two soldier task.
• Raising the tire carrier requires approximately 70 psi (5 bar) of air
from the vehicle rear air system. If possible, the operator should start
engine (WP 0044) and let idle during raise operation to ensure ade-
quate supply of air.
1. If vehicle is not idling, set ignition switch (1) to on position , and check the following:

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

3 1

Figure 6.

0038-6
 TM 9-2320-341-10 0038

a. SPARE TIRE LOOSE indicator (2) illuminated.

b. Rear air pressure gauge (3) reads at least 70 psi (5 bar). If less than 70 psi (5 bar),
the operator has the following options:
(1) Start engine (WP 0044) and allow rear air system to recharge.
(2) Raise tire carrier using outside air source. (WP 0083)
(3) Raise tire carrier using hand pump. (WP 0082)
2. Ensure spare tire is securely fastened to the tire carrier.

CAUTION
Ensure the passenger side top engine access cover is closed and se-
cured prior to raising the tire carrier with spare tire installed. If access
cover is braced open, spare tire will contact it and cause damage to the
cover as well as prevent the tire carrier from locking in full up position.

NOTE
If passenger side top engine access cover is open and laying flat, the tire
(in the full up position) will not allow the access cover to be closed.
3. Ensure passenger side top engine access cover is secured closed.

CAUTION
The tire carrier lock rods are a snag hazard to the movement of the tire
carrier and must be properly stowed in stowage brackets prior to lowering
the tire carrier. Failure to properly stow tire carrier lock rods prior to low-
ering operation may result in damage to equipment.
4. Ensure left lock rod (4) is properly stowed in stowage bracket (5).

0038-7
 TM 9-2320-341-10 0038

5 4 6 7

Figure 7.

5. Ensure right lock rod (6) is properly stowed in stowage bracket (7).

WARNING

If tire carrier is in any position other than full up and locked (tire carrier
latch engaged) or resting on ground, only tire carrier pump operator
should be within six feet (1.83 m) of passenger side of vehicle from battery
box forward. Failure to comply may result in personnel being struck by
tire carrier/spare tire, causing injury or death to personnel.
6. Ensure safety area is clear of personnel and equipment. Assistant will stand outside
the safety area and ensure no personnel wander into safety area while raising operation
is taking place.

0038-8
 TM 9-2320-341-10 0038

SAFETY
AREA

6 FT (1.83m) SAFETY AREA

Figure 8.

7. Set directional control lever (8) to RAISE (pointing inboard) position.

0038-9
 TM 9-2320-341-10 0038

Figure 9.

NOTE
• The operator will notice a small amount of oil being expelled with the
air from the tire carrier pump each time it cycles, this is a normal
condition.
• When the power control is pressed, the tire carrier pump cyclic rate
will be rapid at first, and then slow noticeably. As cyclic rate slows,
the operator should notice the tire carrier begin to move.
8. Press and hold power control (9).

NOTE
• The tire carrier can be stopped at any time during raising operations
by releasing power control.

0038-10
 TM 9-2320-341-10 0038

• As the tire carrier is raised, the tire carrier pump will begin to cycle at
an increased rate.
9. Continue to raise tire carrier until it is in the full up position. The operator will notice a
significant slow down in the tire carrier pump cyclic rate. Release power control (9).

WARNING

Always maintain a distance of six feet (1.83 m) until confirmation that tire
carrier latch is engaged. Failure to comply may result in personnel being
struck by tire carrier/spare tire causing severe injury or death to person-
nel.
10. Maintaining a safe distance of 6 ft. (1.83 m), the assistant will check the tire carrier latch
(10), ensuring it has fully engaged the tire carrier arm bar (11).

11 10

Figure 10.

11. With the assistant maintaining the safety area, the operator will proceed to the driver
side cabin and check to ensure the SPARE TIRE LOOSE indicator (2) has gone out.

0038-11
 TM 9-2320-341-10 0038

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 11.

NOTE
• If tire carrier latch is fully engaged, and SPARE TIRE LOOSE indi-
cator light has gone out, skip to Step (15).
• If tire carrier latch fails to fully engage tire carrier bar, or SPARE TIRE
LOOSE indicator fails to go out, perform Steps (12) through (14).
12. Set directional control lever (8) to LOWER (pointing outboard) position.

0038-12
 TM 9-2320-341-10 0038

Figure 12.

13. Press power control (9) until tire carrier lowers approximately 1 ft. (30 cm).
14. Repeat Steps (7) through (11).

NOTE
If tire carrier latch is fully engaged, and SPARE TIRE LOOSE indicator
light has gone out, complete Steps (15) through (20).
15. Remove right lock rod (6) from stowage bracket (7) and pull down to end of groove (12)
until it stops. Turn right lock rod (6) CW until it is hand tight, with jointed end (13) across
tire carrier arm (14).

0038-13
 TM 9-2320-341-10 0038

4 15 6

17 13

7
5

16 12

14

Figure 13.

16. Remove left lock rod (4) from stowage bracket (5), locate washer (15) and pull towards
left lock rod (4) until it stops. Pull both left lock rod (4) and washer (15) down to end of
groove (16). Turn left lock rod (4) CW until it is hand tight, with jointed end (17) pointed
towards tire carrier arm (14).
17. Insert safety pin (18) through hole located on right lock rod jointed end (13).

0038-14
 TM 9-2320-341-10 0038

18

13

Figure 14.

NOTE
Tire carrier directional control lever should always be in LOWER position
for vehicle operation.
18. Set directional control lever (8) to LOWER (pointing outboard) position.

0038-15
 TM 9-2320-341-10 0038

Figure 15.

19. Shut off engine (WP 0057) or set ignition switch (1) to off position (as applicable).

0038-16
 TM 9-2320-341-10 0038

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 16.

20. Stow access ladder. (WP 0034)

END OF TASK

END OF WORK PACKAGE

0038-17
 TM 9-2320-341-10 0039

OPERATOR MAINTENANCE
OPERATE INSTRUMENT PANEL

INITIAL SETUP:

Not Applicable

GENERAL

Instrument panel on HEMTT A4 series vehicle incorporates electronic gauges, indicator

lights, and liquid crystal display LCD to communicate information to operator. LCD has
multiple modes and functions.
LCD can display odometer reading as well as testing gauges and indicator lights. LCD can
also be set to display measured units in English or Metric.

INSTRUMENT PANEL MODES

Sleep Mode: Instrument panel is normally in sleep mode when ignition switch (1) is turned
off. No gauges, indicator lights, or LCD screen (2) will operate in this mode.

2 5 4

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2
3
M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

3
AIR BRAKE

Figure 1.

0039-1
 TM 9-2320-341-10 0039

Limited Mode: If turn signal lever (3) or panel dimmer switch (4) is actuated, instrument
panel goes into limited mode. In limited mode, turn signals, odometer on LCD (2), and fuel
gauge (5) are active. Remaining gauges will go to zero.
Start-up Mode: Instrument panel enters start-up mode when ignition switch (1) is positioned
on. After key-on, an optional gauge start-up self test (SST) may be performed. Operator
can enable or disable SST by pressing and holding both M (mode) button (6) and trip T (trip)
button (7) while setting ignition switch (1) to on position. A screen will be displayed that
allows operator to enable SST (Yes) or disable SST (No).

6 2 7

CHEM INTER
ALARM AXLE

8X8

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

M 1
2
3
M

HIGH 0
1
IDLE 2

Figure 2.

During start-up mode:

• With SST disabled, gauges will go to zero and move to current status positions.
With SST enabled, gauges move upscale, pausing at half scale before going to full
scale. Gauges will go to zero before moving to current status positions.
• LCD (2) will display any warning messages and will then display odometer, trip
odometer, engine hour meter, and battery voltage readings. LCD (2) will revert to
normal drive mode screen. If SST is enabled, LCD (2) will also turn on and off,
followed by OSHKOSH logo, and finally, software information before going to
normal drive mode screen.
• Warning lights will turn on and off followed by active warning lights (if any) coming
back on.
• With SST disabled, there is no alarm at start-up. With SST enabled, a one second
alarm will sound at start-up.
Ignition Mode: Instrument panel will be in ignition mode whenever ignition switch (1) is
positioned on. Instrument Panel is fully active in this mode.
Diagnostic Mode: From ignition mode with vehicle speed at zero, pressing M button (6)
for more that two seconds allows instrument panel to enter diagnostic mode. This mode
provides following functions.

0039-2
 TM 9-2320-341-10 0039

• Set units.
• Adjust contrast.
• Instrument diagnostics.

LCD MESSAGE CENTER

NOTE
LCD will display warning as dictated by various control systems on vehi-
cle. Warning will remain on screen until warning is no longer valid or, until
operator pushes T (trip) button.
Drive Mode Screen. This is normal display screen when operating vehicle. In drive mode,
LCD (1) will display odometer reading, system voltage reading, and either operating hours
or trip odometer reading. To toggle back and forth between these two options, operator
must press and release M (mode) button (2) in less than two seconds.

2 1 3

CHEM INTER
ALARM AXLE

8X8

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

M 1
2
3
M

HIGH 0
1
IDLE 2

Figure 3.

Settings and diagnostics. Operator can enter settings and diagnostics menu from drive
mode screen when engine is running and vehicle speed is zero. To enter settings and
diagnostics menu, operator must push M button (2) for more than two seconds. Item
highlighted will be item selected when both M button (2) and T button (3) are pressed
together. Pressing M button (2) or T button (3) separately will scroll through various
selections.
1. To change measurement units.
a. Enter LCD (1) settings and diagnostics screen.

0039-3
 TM 9-2320-341-10 0039

2 1 3

CHEM INTER
ALARM AXLE

8X8

0-Set Units
1-Contrast AUX
HYD
HYD
ENABLE GPFU
B.O
SELECT
B.O
LIGHTS

2-Instrument Diagnostics
\/ Select /\ M 1
2 M
3

HIGH 0
1
IDLE 2

Figure 4.
b. Scroll down using M button (2) or up using T button (3) until '0-Set Units' is selected
(shown).
c. Press M button (2) and T button (3) at same time. Current Units screen will appear.

2 1 3

CHEM INTER
ALARM AXLE

Current Units
8X8

ENGLISH AUX
HYD
HYD
ENABLE GPFU
B.O
SELECT
B.O
LIGHTS

Press t for METRIC

Press m to exit M 1
2 M
3

HIGH 0
1
IDLE 2

Figure 5.
d. Press T button (3) to change measurement units to English or Metric.
e. Press M button (2) to return LCD (1) to drive mode screen.
2. To change LCD screen contrast setting.
a. Enter LCD (1) settings and diagnostics screen.

0039-4
 TM 9-2320-341-10 0039

2 1 3

CHEM INTER
ALARM AXLE

0-Set Units
8X8

1-Contrast AUX
HYD
HYD
ENABLE GPFU
B.O
SELECT
B.O
LIGHTS

2-Instrument Diagnostics
\/ Select /\ M 1
2 M

HIGH 0
1
IDLE 2

Figure 6.
b. Scroll down using M button (2) or up using T button (3) until '1-Contrast' is selected
(shown).
c. Press M button (2) and T button (3) at same time. CONTRAST ADJUST screen will
appear.

2 1 3

CHEM INTER
ALARM AXLE

8X8

CONTRAST ADJUST AUX

HYD
HYD
ENABLE GPFU
B.O
SELECT
B.O
LIGHTS

+ -
M 1
2
3
M

HIGH 0
1
IDLE 2

Figure 7.
d. Press M button (2) to increase LCD (1) contrast.
e. Press T button (3) to decrease LCD (1) contrast.
f. LCD (1) will automatically return to drive mode screen.
3. Instrument Panel Gauges Testing.
a. Enter LCD (1) settings and diagnostic screen.

0039-5
 TM 9-2320-341-10 0039

2 1 3

CHEM INTER
ALARM AXLE

0-Set Units
8X8

1-Contrast AUX
HYD
HYD
ENABLE GPFU
B.O
SELECT
B.O
LIGHTS

2-Instrument Diagnostics
\/ Select /\ M 1
2
3
M

HIGH 0
1
IDLE 2

Figure 8.
b. Scroll down using M button (2) or up using T button (3) until '2-Instrument
Diagnostics' is selected (shown).
c. Press M button (2) and T button (3) at same time. Instrument diagnostic screen will
appear.

2 1 3

CHEM INTER
ALARM AXLE

8X8

0-Gauge Test
1-Lamp Test AUX
HYD
HYD
ENABLE GPFU
B.O
SELECT
B.O
LIGHTS

2-LCD Test
\/ Select /\ M 1
2 M
3

HIGH 0
1
IDLE 2

Figure 9.
d. Scroll down using M button (2) or up using T button (3) until '0-Gauge Test' is
selected (shown).
e. Press M button (2) and T button (3) together to begin testing gauges (fuel gauge
test shown). Each gauge is tested in turn at 0%, 50%, and 100%. LCD (1) displays
corresponding percentage.

0039-6
 TM 9-2320-341-10 0039

2 1 3

Fuel Level CHEM INTER

ALARM AXLE

8X8

EXIT 0% AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

Fuel Level M 1
2
3
M

EXIT 50% HIGH 0

1
IDLE 2

Fuel Level
EXIT 100%

Figure 10.
f. Press M button (2) to end test and return LCD (1) to drive mode screen.
g. Contact field level maintenance to replace gauge/instrument panel if corresponding
gauge does not reflect reading on LCD (1).
4. Instrument Panel Indicator Lamps Testing.
a. Enter LCD (1) settings and diagnostic screen.

2 1 3

CHEM INTER
ALARM AXLE

0-Set Units
8X8

1-Contrast AUX
HYD
HYD
ENABLE GPFU
B.O
SELECT
B.O
LIGHTS

2-Instrument Diagnostics
\/ Select /\ M 1
2
3
M

HIGH 0
1
IDLE 2

Figure 11.
b. Scroll down using M button (2) or up using T button (3) until '2-Instrument
Diagnostics' is selected (shown).
c. Press M button (2) and T button (3) at same time. Instrument diagnostic screen will
appear.

0039-7
 TM 9-2320-341-10 0039

2 3

CHEM INTER
ALARM AXLE

0-Gauge Test
8X8

1-Lamp Test AUX

HYD
HYD
ENABLE GPFU
B.O
SELECT
B.O
LIGHTS

2-LCD Test
\/ Select /\ M 1
2
3
M

HIGH 0
1
IDLE 2

Figure 12.
d. Scroll down using M button (2) or up using T button (3) until '1-Lamp Test' is selected
(shown).
e. Press M button (2) and T button (3) together to begin testing warning and indicator
lamps. Each warning and indicator lamp on main gauge/instrument panel is turned
on and off in turn. LCD (1) displays corresponding warning or indicator lamp under
test (high beam indicator test shown).

2 1 3

CHEM INTER
ALARM AXLE

8X8

High Beam AUX

HYD
HYD
ENABLE GPFU
B.O B.O
SELECT LIGHTS

EXIT ON
M 1
2
3
M

High Beam HIGH

IDLE
0
1
2

EXIT OFF

Figure 13.
f. Press M button (2) to end test and return LCD (1) to drive mode screen.
g. Contact field level maintenance to replace main gauge/instrument panel if warning
or indicator lamp fails to illuminate as indicated by LCD (1).

NOTE
Instrument panel LCD is used as part of test procedure. If LCD is un-
readable during any part of test, it should be considered defective and
replaced.
5. Instrument Panel Liquid Crystal Display (LCD) Testing.

0039-8
 TM 9-2320-341-10 0039

a. Enter LCD (1) settings and diagnostic screen.

2 1 3

CHEM INTER
ALARM AXLE

0-Set Units
8X8

1-Contrast AUX
HYD
HYD
ENABLE GPFU
B.O
SELECT
B.O
LIGHTS

2-Instrument Diagnostics
\/ Select /\ M 1
2
3
M

HIGH 0
1
IDLE 2

Figure 14.
b. Scroll down using M button (2) or up using T button (3) until '2-Instrument
Diagnostics' is selected (shown).
c. Press M button (2) and T button (3) at same time. Instrument diagnostic screen will
appear.

2 1 3

CHEM INTER
ALARM AXLE

8X8

0-Gauge Test
1-Lamp Test AUX
HYD
HYD
ENABLE GPFU
B.O
SELECT
B.O
LIGHTS

2-LCD Test
\/ Select /\ M 1
2 M
3

HIGH 0
1
IDLE 2

Figure 15.
d. Scroll down using M button (2) or up using T button (3) until '2-LCD Test' is selected
(shown).
e. Press M button (2) and T button (3) together to begin testing LCD (1). Display should
alternate between normal (shown-top) and negative (shown-bottom) mode three
times before returning to drive mode screen.

0039-9
 TM 9-2320-341-10 0039

2 1 3

CHEM INTER
ALARM AXLE

8X8

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

M 1
2
3
M

HIGH 0
1
IDLE 2

Figure 16.
f. Contact field level maintenance to replace main gauge/instrument panel if LCD (1)
fails to illuminate as shown and described in Step (f).

END OF TASK

END OF WORK PACKAGE

0039-10
 TM 9-2320-341-10 0040

OPERATOR MAINTENANCE
OPERATE AIR SUSPENSION BALL VALVES

INITIAL SETUP:

Not Applicable

TURN BALL VALVES ON

CAUTION
• Never operate vehicle with suspension dumped (deflated) during
normal driving operations. Failure to comply may result in damage to
equipment.
• Never operate vehicle with one or more ball valves positioned OFF.
Failure to comply may result in damage to equipment.

NOTE
• Vehicle is equipped with four ball valves, one on top of each air spring
on No. 1 and No. 4 axles. Each ball valve controls two air springs
(zone).
• No. 1 axle driver side ball valve controls both No. 1 and No. 2 axle
air springs (zone) for that side of vehicle.
• No. 1 axle passenger side ball valve controls both No. 1 and No. 2
axle air springs (zone) for that side of vehicle.
• No. 4 axle driver side ball valve controls both No. 4 and No. 3 axle
air springs (zone) for that side of vehicle.
• No. 4 axle passenger side ball valve controls both No. 4 and No. 3
axle air springs (zone) for that side of vehicle.
1. Position ball valve (1) ON (shown):
a. Pull lock (2) towards handle (3) and push handle (3) in until parallel with ball valve
(1).

0040-1
 TM 9-2320-341-10 0040

2 3

Figure 1.

b. Release lock (2), and gently move handle (3) back and forth until lock is engaged.

NOTE
Refer to operate air suspension dump valve (WP 0036) for more infor-
mation on air suspension servicing/dumping procedures.
2. Repeat Step (1) as necessary on remaining ball valves (1).

TURN BALL VALVES OFF

CAUTION
• Never operate vehicle with suspension dumped (deflated) during
normal driving operations. Failure to comply may result in damage to
equipment.

0040-2
 TM 9-2320-341-10 0040

• Never operate vehicle with one or more ball valves positioned OFF.
Failure to comply may result in damage to equipment.

NOTE
• Vehicle is equipped with four ball valves, one on top of each air spring
on No. 1 and No. 4 axles. Each ball valve controls two air springs
(zone).
• No. 1 axle driver side ball valve controls both No. 1 and No. 2 axle
air springs (zone) for that side of vehicle.
• No. 1 axle passenger side ball valve controls both No. 1 and No. 2
axle air springs (zone) for that side of vehicle.
• No. 4 axle driver side ball valve controls both No. 4 and No. 3 axle
air springs (zone) for that side of vehicle.
• No. 4 axle passenger side ball valve controls both No. 4 and No. 3
axle air springs (zone) for that side of vehicle.
1. Position ball valve (1) OFF (shown):
a. Pull lock (2) towards handle (3) and push handle (3) until at 90 degree angle with
ball valve (1).

0040-3
 TM 9-2320-341-10 0040

1 2

Figure 2.

b. Release lock (2), and gently move handle (3) back and forth until lock is engaged.

NOTE
Refer to operate air suspension dump valve (WP 0036) for more infor-
mation on air suspension servicing/dumping procedures.
2. Repeat Step (1) as necessary on remaining ball valves (1).

END OF TASK

END OF WORK PACKAGE

0040-4
 TM 9-2320-341-10 0041

OPERATOR MAINTENANCE
CONNECT/DISCONNECT M870/M870A1 SEMITRAILER

INITIAL SETUP:

Not Applicable

CONNECT M870/M870A1 SEMITRAILER

WARNING

• This procedure should be performed on level ground. Failure to

comply may result in injury or death to personnel.
• Operator must always be stationed in driver's seat any time the
tractor vehicle is in N (neutral) with wheel chocks removed. Failure
to comply may result in injury or death to personnel.

CAUTION
• Always refer to semitrailer specific operator's manual (TM
5-2330-378-14&P) prior to coupling. Failure to comply may result in
damage to equipment.
• Lockouts must be positioned as identified in Table 1. Failure to
comply may result in damage to equipment.

NOTE
• This procedure is a two soldier task.
• Leave tractor vehicle running during procedure for heavy-duty winch
operation.
• Tractor vehicle is equipped with fifth wheel to accept 3.5 in. (89 mm)
kingpin.
• If fifth wheel lockout assemblies are not positioned correctly,
complete Step (2) or (3) as applicable.

0041-1
 TM 9-2320-341-10 0041

• Remove lockout assembly only if desired lockring position (HALF

LOCK or FULL LOCK) is not located to the inside (against the fifth
wheel). To remove lockout assembly, complete Step (2).
• Loosen and rotate lockring if NO LOCK position is desired, or if
desired lockring position (HALF LOCK or FULL LOCK) is located to
the inside (against the fifth wheel). To loosen and rotate lockout
assembly, complete Step (3).
1. Refer to Table 1. to determine whether lockout assembly lockrings are in correct
position.

Table 1. Lockout Requirements.

SEMITRAILER CENTER OF GRAVITY

ON-ROAD OFF-ROAD
(CG)

BELOW 65 in. (165 cm) HALF LOCK NO LOCK

(3° Oscillation) (6° Oscillation)

ABOVE 65 in. (165 cm) FULL LOCK NO LOCK

(No Oscillation) (6° Oscillation)

HALF
FULL LOCK
LOCK
FULL LOCK

HALF LOCK

NO LOCK
NO LOCK

Figure 1.

0041-2
 TM 9-2320-341-10 0041

NOTE
• If lockout assembly is oriented correctly (refer to table 1), skip to Step
(4).
• Remove lockout assembly only if desired lockring position (HALF
LOCK or FULL LOCK) is not located to the inside (against the fifth
wheel).
• To remove lockout assembly, complete Step (2).
• Loosen and rotate lockring if NO LOCK position is desired, or if
desired lockring position (HALF LOCK or FULL LOCK) is located to
the inside (against the fifth wheel).
• To loosen and rotate lockout assembly, skip to Step (3).
• Both fifth wheel lockout assemblies are removed the same way
(driver side shown).
2. Remove fifth wheel lockout assembly and orient correctly:

0041-3
 TM 9-2320-341-10 0041

3
2
1

6
8
5

4 9 10

Figure 2.

a. Remove four screws (1), lockwashers (2), cover plate (3), and lockring (4) from fifth
wheel (5).
b. Install lockring (4) so desired surface area (see Table 1 above) is oriented directly
under engagement area (6) of fifth wheel (5) with cover plate (3), four lockwashers
(2) and screws (1).
c. Repeat Step (2) for opposite side of fifth wheel (5).

NOTE
• If lockout assembly is oriented correctly (refer to table 1), skip to Step
(4).
• Loosen and rotate lockring if NO LOCK position is desired, or if
desired lockring position (HALF LOCK or FULL LOCK) is located to
the inside (against the fifth wheel).

0041-4
 TM 9-2320-341-10 0041

• Both fifth wheel lockout assemblies are rotated the same way (driver
side shown).
3. Rotate fifth wheel lockout assembly:
a. Loosen four screws (1).

NOTE
• Driver side lockring rotates toward the rear of vehicle.
• Passenger side lockring rotates toward the front of vehicle.
b. Rotate lockring (4) so desired surface area (see table 1 above) is oriented directly
under engagement area (6) of fifth wheel (5).
c. Tighten four screws (1).
d. Repeat Step (3) for opposite side of fifth wheel (5).

NOTE
Fifth wheel has two lock release handles.
4. Pull fifth wheel secondary lock release handle (7) completely out as far as it will go.
5. Pull out fifth wheel primary lock release handle (8) and hook it in out position.
6. Push down rear of fifth wheel (5) until it rests on stop (9) below guide ramps (10).

CAUTION
• Ensure there is a generous amount of grease on fifth wheel, ramps,
kingpin, and steering wedge. Failure to comply may result in damage
to equipment.
• Tractor vehicle and semitrailer coupling should be performed with the
tractor vehicle and semitrailer in a straight line. If wedge of trailer is
not aligned with tractor vehicle fifth wheel, adjust either tractor
vehicle, trailer, or both to align them. Failure to comply may result in
damage to equipment.
7. Prepare semitrailer for coupling (refer to TM 5-2330-378-14&P). (WP 0146)
8. Slowly back tractor vehicle (WP 0051) to within 3 ft. (.92 m) of semitrailer. Stop tractor
vehicle.

0041-5
 TM 9-2320-341-10 0041

WARNING

Ensure that no one is standing between vehicle and semitrailer during

coupling procedure. Failure to comply may result in injury or death to
personnel.
9. Set transmission range selector (8) to N (neutral).

12

INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT
LER
P U LL T O

TRAI SUPPKINLYG
AIR PAR D
FOR
NOT MIDLAN
U P P LY

PUSH T
OS

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
1
2
3

ASS

HIGH
IDLE
nn
ATranlliso
smissio

11

Figure 3.

NOTE
Dashboard parking brake indicator will illuminate when PARKING
BRAKE control is applied.
10. Pull out PARKING BRAKE control (12).
11. Prepare heavy-duty winch (13) for operation. (WP 0037)

0041-6
 TM 9-2320-341-10 0041

13
14
5

16 15

Figure 4.

WARNING

• Heavy-duty winch operator shall ensure all personnel keep hands

and feet clear of heavy-duty winch during operation. Failure to comply
may result in injury or death to personnel.
• Keep all personnel clear of area when tension is on winch cable.
Winch cable could come loose or break. Failure to comply may result
in injury or death to personnel.
• Always wear protective gloves when handling winch cable. Never let
cable run through hands. Frayed cables can cut severely. Failure to
comply may result in injury or death to personnel.
• Never operate winch with less than five wraps of cable on winch
drum. Failure to comply may result in injury or death to personnel.
12. With aid of an assistant, pay out heavy-duty winch cable (14) over fifth wheel (5) and
guide roller (15), and connect heavy-duty winch cable (14) to lifting eye (16) of
semitrailer.
13. Ensure tractor vehicle does not have parking brake or service brakes engaged while
assistant reels in heavy-duty winch cable (9) and lifts semitrailer off ground. (WP
0037)

0041-7
 TM 9-2320-341-10 0041

NOTE
Dashboard parking brake indicator will go out when PARKING BRAKE
control is released.
14. Push in PARKING BRAKE control (12).

12

CHEM INTER
ALARM AXLE
25 6.2
22 5.5
15 3.7
8X8 11
8
2.7
2.0

IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE
M 1
2 M

HIGH 0
1
IDLE 2 TRAILER
AIR SUPPLY

AIR BRAKE

Figure 5.

WARNING

Ensure that no one is standing between vehicle and semitrailer during

coupling procedure. Failure to comply may result in injury or death to
personnel.

CAUTION
Ensure tractor vehicle does not have parking brake or service brakes
engaged while assistant reels in heavy-duty winch cable and lifts semi-
trailer off ground. Failure to comply may result in damage to equipment.
15. Reel in heavy-duty winch cable (14) until semitrailer gooseneck (17) is in maximum
upright position. Operator allows semitrailer and tractor vehicle to roll together.

0041-8
 TM 9-2320-341-10 0041

18
14
10
17

Figure 6.

CAUTION
Do not run kingpin up guide ramps to prevent damage to kingpin, guide
ramps, or fifth wheel.

NOTE
• As semitrailer contacts tractor vehicle, second assistant should
visually check that front of semitrailer is on guide ramps.
• Tractor vehicle is equipped with fifth wheel to accept 3.5 in. (89 mm)
kingpin.
16. Continue to reel in heavy-duty winch cable (14) as semitrailer moves up guide ramps
(10), and semitrailer kingpin (18) locks in fifth wheel (5).

NOTE
If coupling is not secure, rock tractor vehicle back and forth slowly until
kingpin is locked in fifth wheel.
17. Verify semitrailer kingpin (18) is fully engaged and locked within fifth wheel (5).

NOTE
Dashboard parking brake indicator will illuminate when PARKING
BRAKE control is applied.
18. Pull out PARKING BRAKE control (12).

0041-9
 TM 9-2320-341-10 0041

12

CHEM INTER
ALARM AXLE
25 6.2
22 5.5
15 3.7
8X8 11
8
2.7
2.0

IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE
M 1
2 M

HIGH 0
1
IDLE 2 TRAILER
AIR SUPPLY

AIR BRAKE

Figure 7.
19. Ensure primary lock release handle (8) is pushed completely in.

Figure 8.

NOTE
• If semitrailer is M870, continue with Step (19).
• If semitrailer is M870A1, skip to Step (20).
20. Perform the following for a M870 semitrailer:
a. Install two lockpins (19), one on each side of semitrailer gooseneck (17).

0041-10
 TM 9-2320-341-10 0041

20
19
22

21
17 23

M870

Figure 9.
b. Install two safety screws (20), nuts (21), safety locking pins (22), and safety clips
(23) in lockpins (19).

NOTE
If semitrailer is M870A1, continue with Step (20).
21. Perform the following for a M870A1 semitrailer:

CAUTION
Ensure safety latches on locking pins lay flat against the frame of
semitrailer and in holder. Failure to comply may result in damage to
equipment.
a. Install two lockpins (19), one on each side of semitrailer gooseneck (17).

0041-11
 TM 9-2320-341-10 0041

17

19

M870A1

Figure 10.
22. Disconnect tractor vehicle air lines (24) from tree (25).

0041-12
 TM 9-2320-341-10 0041

25

27

24

28

29
30

24

26

31
M870A1 31
M870

Figure 11.

NOTE
• Connect tractor vehicle emergency (red) air line to semitrailer
emergency (red) air line.

0041-13
 TM 9-2320-341-10 0041

• Connect tractor vehicle service (blue) air line to semitrailer service

(blue) air line.
23. Connect tractor vehicle air lines (24) to semitrailer air lines (26).
24. Remove inter-vehicular wiring harness (27) from stowage box and connect cable plug
(28) to receptacle on tractor vehicle (29).

NOTE
M870/M870A1 semitrailers have both 12-volt and 24-volt receptacles,
use the 24-volt receptacle.
25. Connect free end of inter-vehicular harness cable plug (30) to receptacle (31) on
semitrailer.

NOTE
The M870 and M870A1 semitrailers have different air reservoir configu-
rations (refer to figure below).
26. Ensure semitrailer air reservoirs (32) have drain cocks (33) in closed position.

0041-14
 TM 9-2320-341-10 0041

32

33

M870 - FRONT AND MIDDLE

RESERVOIRS

32

33
M870 - REAR RESERVOIR
M870A1 - ALL RESERVOIR

Figure 12.
27. With aid of an assistant, disconnect heavy-duty winch cable (14) from semitrailer lifting
eye (16) and stow heavy-duty winch cable (14).

14
16

Figure 13.

28. With aid of an assistant, prepare semitrailer for transport (refer to TM

5-2330-378-14&P). (WP 0146).

0041-15
 TM 9-2320-341-10 0041

29. Push in TRAILER AIR SUPPLY control (34).

CHEM INTER
ALARM AXLE
25 6.2
22 5.5
15 3.7
8X8 11
8
2.7
2.0

IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE
M 1
2 M

HIGH 0
1
IDLE 2 TRAILER
AIR SUPPLY

AIR BRAKE

35 36 34

Figure 14.
30. Both FRONT (35) and REAR (36) air pressure gauges must indicate at least 100 psi
(6.9 bar) before transporting semitrailer.
31. Transport semitrailer (refer to TM 5-2330-378-14&P for semitrailer specific operating
procedures). (WP 0146)

DISCONNECT M870/M870A1 SEMITRAILER

WARNING

• This procedure should be performed on level ground. Failure to

comply may result in injury or death to personnel.
• Operator must always be stationed in driver's seat any time the
tractor vehicle is in N (neutral) with wheel chocks removed. Failure
to comply may result in injury or death to personnel.

CAUTION
• Operator should not leave cab of tractor vehicle during these
procedures. Tractor vehicle will have engine running, wheel chocks
removed, and PARKING BRAKE control released (disengaged) for
extended periods of time. Failure to comply may result in damage to
equipment.

0041-16
 TM 9-2320-341-10 0041

• Always refer to semitrailer specific operator's manual (TM

5-2330-378-14&P) (WP 0146) prior to uncoupling. Failure to comply
may result in damage to equipment.

NOTE
• This procedure is a two soldier task.
• Leave tractor vehicle running during procedure for heavy-duty winch
operation.
1. Position tractor vehicle and semitrailer.
2. Set transmission range selector (1) to N (neutral).

INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT
LER

PULL TO
TRAI SUPPKINLYG
AIR PAR D
FOR
NOT MIDLAN

S UPPLY
PUS O
HT

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
1
2

ASS

HIGH
IDLE
nn
ATranlliso
smissio

Figure 15.

NOTE
Dashboard parking brake indicator will illuminate when PARKING
BRAKE control is applied.
3. Pull out PARKING BRAKE control (2).

CAUTION
Payload must be positioned over rear axles before starting uncoupling
procedures. Failure to comply may result in damage to equipment.

0041-17
 TM 9-2320-341-10 0041

4. With aid of an assistant, prepare semitrailer load for uncoupling (refer to TM

5-2330-378-14&P). (WP 0146)
5. Position semitrailer handbrake control (3) off.

INTER-
AXLE
8X8
4
B.O.
LIGHTS
B.O.
EXHAUST
SELECT
LER
PULL TO

TRAI SUPPKINLYG
AIR PAR D
FOR
NOT MIDLAN
S UPPLY

PUS O
HT

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
1
2

ASS

HIGH
IDLE
nn
ATranlliso
smissio

Figure 16.
6. Pull out TRAILER AIR SUPPLY control (4).
7. Disconnect air lines (5) from semitrailer and stow air lines on tree (6).

0041-18
 TM 9-2320-341-10 0041

Figure 17.

8. Disconnect inter-vehicular wiring harness (7) from semitrailer, remove cable plug (8)
from tractor vehicle receptacle (9), and stow inter-vehicular wiring harness (7) in
stowage box.

WARNING

• Heavy-duty winch operator shall ensure all personnel keep hands

and feet clear of heavy-duty winch during operation. Failure to comply
may result in injury or death to personnel.
• Keep all personnel clear of area when tension is on winch cable.
Winch cable could come loose or break. Failure to comply may result
in injury or death to personnel.
• Always wear protective gloves when handling winch cable. Never let
cable run through hands. Frayed cables can cut severely. Failure to
comply may result in injury or death to personnel.

0041-19
 TM 9-2320-341-10 0041

• Never operate winch with less than five wraps of cable on winch
drum. Failure to comply may result in injury or death to personnel.

NOTE
9. With aid of an assistant, pay out heavy-duty winch cable (10) (WP 0037) and connect
to lifting eye (11) of semitrailer.

10
11

Figure 18.

NOTE
• If semitrailer is M870, continue with Step (10).
• If semitrailer is M870A1, skip to Step (11).
10. Perform the following for a M870 semitrailer:
a. Remove two safety clips (12), safety locking pins (13), nuts (14), and screws (15)
from lockpins (16).

0041-20
 TM 9-2320-341-10 0041

15
16
13

14
17 12

M870

Figure 19.
b. Remove two lockpins (16), one from each side of semitrailer gooseneck (17).
c. Install two safety screws (15), nuts (14), safety locking pins (13), and safety clips
(12) in lockpins (16) to prevent loss.

NOTE
• If semitrailer is M870, skip to Step (12).
• If semitrailer is M870A1, continue with Step (11).
11. Remove two lockpins (16), one from each side of semitrailer gooseneck (17).

17

16

M870A1

Figure 20.

NOTE
Fifth wheel has two lock release handles.

0041-21
 TM 9-2320-341-10 0041

12. Pull fifth wheel secondary lock release handle (18) completely out as far as it will go.

19

18

Figure 21.

13. Pull out fifth wheel primary lock release handle (19) and hook it in out position.

NOTE
Dashboard parking brake indicator will go out when PARKING BRAKE
control is released.
14. Push in PARKING BRAKE control (2).

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

GPFU

2
HYD ENABLE SELECT LIGHTS

PARKING
BRAKE

M 1
2
3 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 22.

0041-22
 TM 9-2320-341-10 0041

WARNING

• Heavy-duty winch operator shall ensure all personnel keep hands

and feet clear of heavy-duty winch during operation. Failure to comply
may result in injury or death to personnel.
• Keep all personnel clear of area when tension is on winch cable.
Winch cable could come loose or break. Failure to comply may result
in injury or death to personnel.
• Always wear protective gloves when handling winch cable. Never let
cable run through hands. Frayed cables can cut severely. Failure to
comply may result in injury or death to personnel.
• Never operate winch with less than five wraps of cable on winch
drum. Failure to comply may result in injury or death to personnel.

CAUTION
• When uncoupling on soft or rough terrain, tractor vehicle may not roll
forward as heavy-duty winch cable is payed out. It will be necessary
to move tractor vehicle forward as assistant pays out heavy-duty
winch cable. Failure to comply may result in damage to equipment.
• Do not pay out too much heavy-duty winch cable before tractor
vehicle is moved forward or semitrailer gooseneck may contact
tractor vehicle. Failure to comply may result in damage to equipment.
15. Ensure proper tractor vehicle position while slowly paying out heavy-duty winch cable
(10) (WP 0037) and assistant checks clearance between tractor vehicle (20) and
semitrailer (21).

0041-23
 TM 9-2320-341-10 0041

10

21 20

Figure 23.

NOTE
Continue Step (15) as semitrailer landing pads touch ground, and until
semitrailer gooseneck fully extends and rests on ground.
16. Verify semitrailer (21) is in full contact with ground.

NOTE
Dashboard parking brake indicator will illuminate when PARKING
BRAKE control is applied.
17. Pull out PARKING BRAKE control (2).

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

GPFU

2
HYD ENABLE SELECT LIGHTS

PARKING
BRAKE

M 1
2
3 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 24.

0041-24
 TM 9-2320-341-10 0041

CAUTION
Use wheel chocks when uncoupling tractor vehicle from semitrailer. Fail-
ure to comply may result in damage to equipment.

NOTE
• If semitrailer is parked on level ground; put one wheel chock in front
of tire on one side and one wheel chock in back of tire on other side
of tractor vehicle.
• If semitrailer is parked uphill; place one wheel chock on each side of
semitrailer in back of tire.
• If semitrailer is parked downhill; place one wheel chock on each side
of semitrailer in front of tire.
18. Chock semitrailer wheels (refer to TM 5-2330-378-14&P). (WP 0146)

0041-25
 TM 9-2320-341-10 0041

CHOCK

LEVEL GROUND
CHOCK
CHOCK

UPHILL
CHOCK
CHOCK

DOWNHILL
CHOCK

Figure 25.

0041-26
 TM 9-2320-341-10 0041

NOTE
• If semitrailer is M870, continue with Step (19).
• If semitrailer is M870A1, skip to Step (20).
19. Perform the following for a M870 semitrailer:
a. Install two lockpins (16), one on each side of semitrailer gooseneck (17).
b. Install two safety screws (15), nuts (14), safety locking pins (13), and safety clips
(12) in lockpins (16).

15
13

14

16 12

M870

11 17
10

16
M870A1

Figure 26.

NOTE
• If semitrailer is M870, skip to Step (21).
• If semitrailer is M870A1, continue with Step (20).
20. Install two lockpins (16), one on each side of semitrailer gooseneck (17).

0041-27
 TM 9-2320-341-10 0041

WARNING

• Heavy-duty winch operator shall ensure all personnel keep hands

and feet clear of heavy-duty winch during operation. Failure to comply
may result in injury or death to personnel.
• Keep all personnel clear of area when tension is on winch cable.
Winch cable could come loose or break. Failure to comply may result
in injury or death to personnel.
• Always wear protective gloves when handling winch cable. Never let
cable run through hands. Frayed cables can cut severely. Failure to
comply may result in injury or death to personnel.
• Never operate winch with less than five wraps of cable on winch
drum. Failure to comply may result in injury or death to personnel.
21. With the aid of an assistant, disconnect heavy-duty winch cable (10) from semitrailer
lifting eye (11) and stow. (WP 0037)
22. Refer to TM 5-2330-378-14&P (WP 0146) for further instructions regarding M870/
M870A1 semitrailer.

END OF TASK

END OF WORK PACKAGE

0041-28
 TM 9-2320-341-10 0042

OPERATOR MAINTENANCE
HEAVY-DUTY WINCH OPERATION USING REMOTE-CONTROL UNIT

INITIAL SETUP:

Not Applicable

PREPARE TO OPERATE HEAVY-DUTY WINCH

WARNING

• Using remote-control unit and operating heavy-duty winch away from

vehicle will lessen the possibility of injury or death to personnel if
winch cable separates under tension.
• Excessive noise levels are present any time the heavy-duty winch is
operating. Wear single hearing protection (earplugs or equivalent)
while working around equipment when it is running. Failure to comply
may result in injury or death to personnel. Seek medical aid should
you suspect a hearing problem.

NOTE
This procedure is a two soldier task.
1. Start engine. (WP 0044)
2. Position vehicle for straight pull and on solid ground so tires have good traction.
3. Set transmission range selector (1) to N (neutral).

0042-1
 TM 9-2320-341-10 0042

4 2
3
INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT
ILER

PULL TO
TRA SUPPLYING
AIR PARKND
FOR

LY
NOT MIDLA

SU PP
PU S H T O

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
12

ASS

HIGH
IDLE

isoissionn
AllTransm

Figure 1.

NOTE
Dashboard parking brake indicator will illuminate when PARKING
BRAKE control is applied.
4. Pull out PARKING BRAKE control (2).
5. Set HYD ENABLE switch (3) to off position. Indicator light (4) will go out.

CAUTION
Do not move hydraulic selector valve control while HYD ENABLE switch
is set to on position. Failure to comply may result in damage to hydraulic
equipment.
6. Pull out hydraulic selector valve control (5) for winching operations.

0042-2
 TM 9-2320-341-10 0042

Figure 2.

7. Set HYD ENABLE switch (3) to on position. Indicator light (4) will illuminate.

4
3
INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT
ILER
PULL TO

TRA SUPPLYING
AIR PARKND
FOR
LY

NOT MIDLA
SU PP

PU S H T O

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
12

ASS

HIGH
IDLE

isoissionn
AllTransm

Figure 3.

0042-3
 TM 9-2320-341-10 0042

WARNING

Using remote-control unit and operating heavy-duty winch away from ve-
hicle will lessen the possibility of injury or death to personnel if winch cable
separates under tension.
8. Remove remote-control unit (6) and remote-control unit cable (7) from stowage.

10

9
6

Figure 4.

9. Set HD WINCH REMOTE POWER switch (8) to OFF position.

10. Remove cap (9) from remote-control unit hookup receptacle (10).
11. Clean any dirt and debris from both remote-control unit hookup receptacle (10) and
remote-control unit cable plug (11).

0042-4
 TM 9-2320-341-10 0042

11

10

12

13

Figure 5.

12. Connect remote-control unit cable plug (11) to remote-control unit hookup receptacle
(10).
13. Clean any dirt and debris from both remote-control unit cable plug (12) and remote-
control unit receptacle (13).
14. Connect remote-control unit cable plug (12) to remote-control unit receptacle (13).

CAUTION
Operator should only perform Step (15) just before operator intends to
pay out/reel in cable. HD WINCH REMOTE POWER switch should re-
main OFF in all other instances to preclude accidental cable movement.
Failure to comply may result in damage to equipment.
15. Set HD WINCH REMOTE POWER switch (8) to ON position.

0042-5
 TM 9-2320-341-10 0042

PAY OUT CABLE AND CONNECT TO EQUIPMENT

CAUTION
• Do not allow other vehicles to run over winch cable. Winch cable may
be damaged. Failure to comply may result in damage to equipment.
• Cable Hold Down control should never be engaged (pushed in)
during winch cable pay out under power. Failure to comply may result
in damage to equipment.
1. Disengage (pull out) Cable Hold Down control (1).

Figure 6.

CAUTION
Winch KickOut control should never be engaged (pushed in) under load.
Failure to comply may result in damage to equipment.
2. Disengage (pull out) Winch KickOut control (2).
3. Unhook clevis retention chain (3) from clevis (4).

0042-6
 TM 9-2320-341-10 0042

Figure 7.

NOTE
• Setting the HIGH IDLE switch to ON position enables fast speed in
heavy-duty winch. HIGH IDLE should only be used when normal
speed operation is too slow while loading mired equipment or a
semitrailer laden with heavy equipment.
• Due to the increased speed of winch cable payout, it is not
recommended that HIGH IDLE be used to pay out winch cable.
4. Use of remote-control unit HIGH IDLE switch (5) is at the discretion of the operator.

0042-7
 TM 9-2320-341-10 0042

6 5 8
7

Figure 8.

WARNING

• Heavy-duty winch operator shall ensure all personnel keep hands

and feet clear of heavy-duty winch during operation. Failure to comply
may result in injury or death to personnel.
• Keep all personnel clear of area when tension is on winch cable.
Winch cable could come loose or break. Failure to comply may result
in injury or death to personnel.
• Always wear protective gloves when handling winch cable. Never let
cable run through hands. Frayed cables can cut severely. Failure to
comply may result in injury or death to personnel.
• Never operate winch with less than five wraps of cable on winch
drum. Failure to comply may result in injury or death to personnel.

CAUTION
Ensure assistant routes winch cable to avoid snag hazards on tractor
vehicle and semitrailer. Failure to comply may result in damage to equip-
ment.

NOTE
The operator may notice the vehicle mounted (manual) winch control
lever mimicking the inputs applied to remote-control unit winch control
lever. This is a normal condition.

0042-8
 TM 9-2320-341-10 0042

5. Pull remote-control unit winch control lever (6) to pay out winch cable (7) while assistant
routes winch cable to equipment. Release remote-control unit winch control lever (6)
when it is determined ample winch cable (7) is available for connection to equipment.

CAUTION
Always be sure there are at least five wraps of winch cable on winch drum.
If there are less than five wraps of winch cable on winch drum, winch
cable may come loose and damage equipment.

NOTE
Ensure weight of equipment and amount of winch cable left on winch does
not go over pull capacity (refer to FM 4-30.31 and Heavy-Duty Winch Pull
Capacity Table below).
6. Check that there are at least five wraps of winch cable (7) on winch (8). If there are not
at least five wraps of winch cable (7) on winch (8), move tractor vehicle closer to
equipment and continue loading, or shut down winch (8).

Table 1. Heavy-Duty Winch Pull Capacity.

CABLE LAYER CABLE ON DRUM (ft.) CAPACITY (lbs)

1 37 45,000

2 81 37,200

3 133 31,700

4 150 27,700

NOTE
If HIGH IDLE was not utilized during winch cable pay out, skip to Step
(8).
7. Set remote-control unit HIGH IDLE switch (5) to OFF position (as applicable).
8. Connect winch cable (7) to equipment.

LOAD EQUIPMENT

1. Engage (push in) Cable Hold Down control (1).

0042-9
 TM 9-2320-341-10 0042

2 1

3 5

Figure 9.

CAUTION
Winch KickOut control should never be engaged (pushed in) under load.
Failure to comply may result in damage to equipment.
2. Disengage (pull out) Winch KickOut control (2).
3. Ensure loading area is clear of personnel.

WARNING

• Heavy-duty winch operator shall ensure all personnel keep hands

and feet clear of heavy-duty winch during operation. Failure to comply
may result in injury or death to personnel.

0042-10
 TM 9-2320-341-10 0042

• Keep all personnel clear of area when tension is on winch cable.

Winch cable could come loose or break. Failure to comply may result
in injury or death to personnel.
• Always wear protective gloves when handling winch cable. Never let
cable run through hands. Frayed cables can cut severely. Failure to
comply may result in injury or death to personnel.
• Never operate winch with less than five wraps of cable on winch
drum. Failure to comply may result in injury or death to personnel.

CAUTION
Gradually apply power to avoid high impact loading of winch cable.

NOTE
Maintaining a safe distance, visually recheck your rigging once light ten-
sion (slack taken out of winch cable) is applied to winch cable.
4. Push in remote-control unit winch control lever (3) slightly to slowly tighten winch cable
(4).

NOTE
• Setting the HIGH IDLE switch to ON position enables fast speed in
heavy-duty winch. HIGH IDLE should only be used when normal
speed operation is too slow while loading mired equipment or a
semitrailer laden with heavy equipment.
• Due to the increased speed of winch cable payout, it is not
recommended that HIGH IDLE be used for loading an empty or lightly
laden semitrailer.
5. Use of remote-control unit HIGH IDLE switch (5) is at the discretion of the operator.

NOTE
• Assistant should be in a position to safely monitor the loading
operation and advise the operator of progress.
• The operator may notice the vehicle mounted (manual) control winch
control lever mimicking the inputs applied to remote-control unit
winch control lever. This is a normal condition.
6. Push in remote-control unit winch control lever (3) and load equipment.

NOTE
Pull remote-control unit winch control lever just enough to allow adequate
slack in winch cable to disconnect from equipment.

0042-11
 TM 9-2320-341-10 0042

7. When equipment is fully loaded, pull remote-control unit winch control lever (3).

NOTE
If high idle was not utilized during winch cable pay out, skip Step (8).
8. Set remote-control unit HIGH IDLE switch (4) to OFF position (as applicable).

DISCONNECT WINCH CABLE AND STOW

1. Ensure Cable Hold Down control (1) is engaged (pushed in).

3 1

2 7 6

5
4

Figure 10.

2. Disconnect winch cable (2) from equipment.

0042-12
 TM 9-2320-341-10 0042

CAUTION
Winch KickOut control should never be engaged (pushed in) under load.
Failure to comply may result in damage to equipment.
3. Disengage (pull out) Winch KickOut control (3).

NOTE
• Setting the HIGH IDLE switch to ON position enables fast speed in
heavy-duty winch. HIGH IDLE should only be used when normal
speed operation is too slow while loading mired equipment or a
semitrailer laden with heavy equipment.
• Due to the increased speed of winch cable payout, it is not
recommended that HIGH IDLE be used to reel in and stow winch
cable.
4. Use of remote-control unit HIGH IDLE switch (4) is at the discretion of the operator.

WARNING

• Heavy-duty winch operator shall ensure all personnel keep hands

and feet clear of heavy-duty winch during operation. Failure to comply
may result in injury or death to personnel.
• Keep all personnel clear of area when tension is on winch cable.
Winch cable could come loose or break. Failure to comply may result
in injury or death to personnel.
• Always wear protective gloves when handling winch cable. Never let
cable run through hands. Frayed cables can cut severely. Failure to
comply may result in injury or death to personnel.
• Never operate winch with less than five wraps of cable on winch
drum. Failure to comply may result in injury or death to personnel.

CAUTION
• Ensure assistant routes winch cable to avoid snag hazards on tractor
vehicle and trailer. Failure to comply may result in damage to
equipment.
• Both operator and assistant should ensure that winch cable wraps
properly and evenly onto heavy-duty winch drum. Failure to comply
may result in damage to equipment.

0042-13
 TM 9-2320-341-10 0042

NOTE
• The operator may notice the vehicle mounted (manual) control winch
control lever mimicking the inputs applied to remote-control unit
winch control lever. This is a normal condition.
• Ensure tension is kept on winch cable at all times during winch cable
retrieval. This accompanied with guidance from the assistant will
ensure the winch cable gets evenly wrapped onto winch drum.
5. Push in remote-control unit winch control lever (5) as assistant routes winch cable (2)
onto winch drum (6).
6. Once winch cable (2) is completely and evenly wrapped onto winch drum (6), release
remote-control unit winch control lever (5).

NOTE
If high idle was not utilized during winch cable pay out, skip to Step (8).
7. Set remote-control unit HIGH IDLE switch (4) to OFF position (as applicable).
8. Assistant connects clevis retention chain (7) to clevis (8).
9. Set HYD ENABLE switch (9) to off position. Indicator light (10) will go out.

10
9
INTER-
AXLE
8X8

B.O.
LIGHTS
B.O. EXHAUST
SELECT
ILER
PULL TO

TRA SUPPLYING
AIR PARKND
FOR
UPPLY

NOT MIDLA

PUS H T
OS

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
12

ASS

HIGH
IDLE

isoissionn
AllTransm

Figure 11.
10. Set HD WINCH REMOTE POWER switch (11) to OFF position.

0042-14
 TM 9-2320-341-10 0042

11

13

12

Figure 12.

11. Disconnect remote-control unit cable plug (12) from remote-control unit hookup
receptacle (13).
12. Install cap (14) on remote-control unit hookup receptacle (13).

0042-15
 TM 9-2320-341-10 0042

13

14
17

18

16
15

Figure 13.

13. Disconnect remote-control unit cable plug (15) from remote-control unit hookup
receptacle (16).
14. Return remote-control unit (17) and remote-control unit cable (18) to stowage.

CAUTION
• The operator should always push in hydraulic selector valve control
when use of the heavy-duty winch is no longer required to ensure the
heavy-duty winch will not be accidentally engaged during other
tractor vehicle operations. Failure to comply may result in damage to
equipment.
• Do not move hydraulic selector valve control while HYD ENABLE
switch is set to on position. Failure to comply may result in damage
to hydraulic equipment.
15. Push in hydraulic selector valve control (19) for all tractor vehicle operations that do not
require use of heavy-duty winch.

0042-16
 TM 9-2320-341-10 0042

19

Figure 14.

END OF TASK

END OF WORK PACKAGE

0042-17
 TM 9-2320-341-10 0043

OPERATOR MAINTENANCE
CONNECT/DISCONNECT M870A3 SEMITRAILER

INITIAL SETUP:

Not Applicable

CONNECT M870A3 SEMITRAILER

CAUTION
• The following are general procedures for connecting the M870A3
semitrailer to a tractor vehicle. Always refer to TM 5-2330-325-14&P
(WP 0146) for specific instructions with regard to operating the
semitrailer. Failure to comply may result in damage to equipment.
• Lockouts must be positioned as identified in Table 1. Failure to
comply may result in damage to equipment.

NOTE
• This procedure is a two soldier task.
• Tractor vehicle is equipped with fifth wheel to accept 3.5 in. (89 mm)
kingpin.
• If fifth wheel lockout assemblies are not positioned correctly,
complete Step (2) or (3) as applicable.
• Remove lockout assembly only if desired lockring position (HALF
LOCK or FULL LOCK) is not located to the inside (against the fifth
wheel). To remove lockout assembly, complete Step (2).
• Loosen and rotate lockring if NO LOCK position is desired, or if
desired lockring position (HALF LOCK or FULL LOCK) is located to
the inside (against the fifth wheel). To loosen and rotate lockout
assembly, complete Step (3).

CAUTION
• Always refer to semitrailer specific operator's manual (TM
5-2330-378-14&P) prior to coupling. Failure to comply may result in
damage to equipment.

0043-1
 TM 9-2320-341-10 0043

• Lockouts must be positioned as identified in Table 1. Failure to

comply may result in damage to equipment.

NOTE
• This procedure is a two soldier task.
• Leave tractor vehicle running during procedure for heavy-duty winch
operation.
• Tractor vehicle is equipped with fifth wheel to accept 3.5 in. (89 mm)
kingpin.
• If fifth wheel lockout assemblies are not positioned correctly,
complete Step (2) or (3) as applicable.
• Remove lockout assembly only if desired lockring position (HALF
LOCK or FULL LOCK) is not located to the inside (against the fifth
wheel). To remove lockout assembly, complete Step (2).
• Loosen and rotate lockring if NO LOCK position is desired, or if
desired lockring position (HALF LOCK or FULL LOCK) is located to
the inside (against the fifth wheel). To loosen and rotate lockout
assembly, complete Step (3).
1. Refer to Table 1. to determine whether lockout assembly lockrings are in correct
position.

Table 1. Lockout Requirements.

SEMITRAILER CENTER OF GRAVITY

ON-ROAD OFF-ROAD
(CG)

BELOW 65 in. (165 cm) HALF LOCK NO LOCK

(3° Oscillation) (6° Oscillation)

ABOVE 65 in. (165 cm) FULL LOCK NO LOCK

(No Oscillation) (6° Oscillation)

0043-2
 TM 9-2320-341-10 0043

Table 1. Lockout Requirements. - Continued

SEMITRAILER CENTER OF GRAVITY

ON-ROAD OFF-ROAD
(CG)

HALF
FULL LOCK
LOCK
FULL LOCK

HALF LOCK

NO LOCK
NO LOCK

Figure 1.

NOTE
• If lockout assembly is oriented correctly (refer to table 1), skip to Step
(4).
• Remove lockout assembly only if desired lockring position (HALF
LOCK or FULL LOCK) is not located to the inside (against the fifth
wheel).
• To remove lockout assembly, complete Step (2).
• Loosen and rotate lockring if NO LOCK position is desired, or if
desired lockring position (HALF LOCK or FULL LOCK) is located to
the inside (against the fifth wheel).
• To loosen and rotate lockout assembly, skip to Step (3).
• Both fifth wheel lockout assemblies are removed the same way
(driver side shown).
2. Remove fifth wheel lockout assembly and orient correctly:

0043-3
 TM 9-2320-341-10 0043

3
2
1

6
8
5

4 9 10

Figure 2.

a. Remove four screws (1), lockwashers (2), cover plate (3), and lockring (4) from fifth
wheel (5).
b. Install lockring (4) so desired surface area (see Table 1 above) is oriented directly
under engagement area (6) of fifth wheel (5) with cover plate (3), four lockwashers
(2) and screws (1).
c. Repeat Step (2) for opposite side of fifth wheel (5).

NOTE
• If lockout assembly is oriented correctly (refer to table 1), skip to Step
(4).
• Loosen and rotate lockring if NO LOCK position is desired, or if
desired lockring position (HALF LOCK or FULL LOCK) is located to
the inside (against the fifth wheel).

0043-4
 TM 9-2320-341-10 0043

• Both fifth wheel lockout assemblies are rotated the same way (driver
side shown).
3. Rotate fifth wheel lockout assembly:
a. Loosen four screws (1).

NOTE
• Driver side lockring rotates toward the rear of vehicle.
• Passenger side lockring rotates toward the front of vehicle.
b. Rotate lockring (4) so desired surface area (see table 1 above) is oriented directly
under engagement area (6) of fifth wheel (5).
c. Tighten four screws (1).
d. Repeat Step (3) for opposite side of fifth wheel (5).

NOTE
Fifth wheel has two lock release handles.
4. Pull fifth wheel secondary lock release handle (7) completely out as far as it will go.
5. Pull out fifth wheel primary lock release handle (8) and hook it in out position.
6. Push down rear of fifth wheel (5) until it rests on stop (9) below guide ramps (10).
7. Set transmission range selector (11) to N (neutral).

14 12
13
INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT
LER
P U LL T O

TRAI SUPPKINLYG
AIR PAR D
FOR
NOT MIDLAN
SUPPLY

PUSH TO

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
1
2
3

ASS

HIGH
IDLE
nn
ATranlliso
smissio

11

Figure 3.

0043-5
 TM 9-2320-341-10 0043

NOTE
Dashboard parking brake indicator will illuminate when PARKING
BRAKE control is applied.
8. Pull out PARKING BRAKE control (12).
9. Set HYD ENABLE switch (13) to OFF position. MAIN HYD ENABLE indicator (14) will
go out.

CAUTION
Do not move hydraulic selector valve control while PTO ENGAGE switch
is set to ON position. Failure to comply may result in damage to hydraulic
equipment.
10. Push in hydraulic selector valve control (15) for M870A3 semitrailer coupling
operations.

15

Figure 4.
11. Set HYD ENABLE switch (13) to ON position. MAIN HYD ENABLE indicator (14) will
illuminate.

0043-6
 TM 9-2320-341-10 0043

13 14

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2
3
M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 5.

NOTE
• If trailer gooseneck is not high enough to couple to tractor vehicle fifth
wheel, position tractor vehicle on left side of semitrailer (preferred)
aligning tractor vehicle auxiliary hydraulic connections with trailer
hydraulic connections (shown).
• Always wipe down all hydraulic connection points on tractor vehicle,
trailer, and hydraulic hoses with a clean rag prior to coupling.
12. Prepare M870A3 semitrailer for coupling (refer to TM 5-2330-325-14&P). (WP 0146).
Ensure hydraulic hoses (16) are not kinked or otherwise impeded.

0043-7
 TM 9-2320-341-10 0043

16

Figure 6.
13. Set HYD ENABLE switch (13) to OFF position. MAIN HYD ENABLE indicator 14) will
go out.

13 14

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2
3
M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 7.
14. Disconnect hydraulic hoses (16) from semitrailer and stow on tractor vehicle work
platform (17).

0043-8
 TM 9-2320-341-10 0043

16
17

Figure 8.

WARNING

Ensure that no one is standing directly behind vehicle or semitrailer during

coupling procedure. Failure to comply may result in injury or death to
personnel.

CAUTION
• Ensure there is a generous amount of grease on fifth wheel, ramps,
kingpin, and steering wedge. Failure to comply may result in damage
to equipment.
• Tractor vehicle and semitrailer coupling should be performed with the
tractor vehicle and semitrailer in a straight line. If wedge of trailer is
not aligned with tractor vehicle fifth wheel, adjust either tractor
vehicle, trailer, or both to align them. Failure to comply may result in
damage to equipment.
• Do not run kingpin up guide ramps to prevent damage to kingpin,
guide ramps, or fifth wheel.
15. Move tractor vehicle forward into position in front of semitrailer. Slowly back tractor
vehicle under semitrailer while assistant stands beside front of semitrailer and gives
hand signals to aid alignment of semitrailer kingpin with throat of fifth wheel.

0043-9
 TM 9-2320-341-10 0043

16. Assistant visually checks that front of semitrailer is on guide ramps (10).

10

Figure 9.

17. Slowly back tractor vehicle until fifth wheel jaws lock around kingpin. Stop tractor
vehicle.

NOTE
Daylight should not show between top of fifth wheel plate and bottom of
semitrailer.
18. Assistant visually checks that kingpin is in fifth wheel throat.
19. Ensure primary lock release handle (8) is pushed completely in.

Figure 10.

NOTE
If coupling is not secure, rock tractor vehicle back and forth slowly until
kingpin is locked in fifth wheel.
20. Verify semitrailer kingpin is fully engaged and locked within fifth wheel.

0043-10
 TM 9-2320-341-10 0043

21. Set transmission range selector (11) to N (neutral).

12

INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT
LER

P U LL T O
TRAI SUPPKINLYG
AIR PAR D
FOR
NOT MIDLAN

SUPPLY
PUSH TO

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
1
2
3

ASS

HIGH
IDLE
nn
ATranlliso
smissio

11

Figure 11.

NOTE
Dashboard parking brake indicator will illuminate when PARKING
BRAKE control is applied.
22. Pull out PARKING BRAKE control (12).

NOTE
Always wipe down all hydraulic connection points on trailer and hydraulic
hoses with a clean rag prior to coupling.
23. Reconnect hydraulic hoses (16) to M870A3 semitrailer.

0043-11
 TM 9-2320-341-10 0043

16

Figure 12.

24. Set HYD ENABLE switch (13) to ON position. MAIN HYD ENABLE indicator (14) will
illuminate.

13 14

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2
3
M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 13.
25. Position semitrailer gooseneck as required (refer to TM 5-2330-325-14&P). (WP
0146)
26. Set HYD ENABLE switch (13) to OFF position. MAIN HYD ENABLE indicator 14) will
go out.

0043-12
 TM 9-2320-341-10 0043

27. Disconnect two hydraulic hoses (16) from semitrailer and tractor vehicle. Stow two
hydraulic hoses in semitrailer tool box (18).

18

16

Figure 14.

NOTE
• Connect blue (service) tractor vehicle air brake line gladhand to blue
(service) semitrailer gladhand.
• Connect red (emergency) tractor vehicle air brake line gladhand to
red (emergency) semitrailer gladhand.
28. Connect tractor vehicle air brake lines (19) to semitrailer gladhands (20).

0043-13
 TM 9-2320-341-10 0043

23
20

21

19

22

Figure 15.

29. Connect inter-vehicular wiring harness (21) to tractor vehicle 24V electrical connector
(22) and semitrailer 24V electrical connector (23).
30. With aid of an assistant, prepare M870A3 semitrailer for transport (refer to TM
5-2330-325-14&P). (WP 0146)
31. Push in TRAILER AIR SUPPLY control (24).

0043-14
 TM 9-2320-341-10 0043

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2
3
M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

25 26 24

Figure 16.
32. Both FRONT (25) and REAR (26) air pressure gauges must indicate at least 100 psi
(6.9 bar) before transporting semitrailer.
33. Transport M870A3 semitrailer (refer to TM 5-2330-325-14&P for semitrailer specific
operating procedures). (WP 0146)

DISCONNECT M870A3 SEMITRAILER

CAUTION
The following are general procedures for disconnecting the M870A3
semitrailer from a tractor vehicle. Always refer to TM 5-2330-325-14&P
for specific instructions with regard to operating the semitrailer. Failure to
comply may result in damage to equipment.

NOTE
This procedure is a two soldier task.
1. Position tractor vehicle and semitrailer.
2. Set transmission range selector (1) to N (neutral).

0043-15
 TM 9-2320-341-10 0043

INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT
LER

PULL TO
TRAI SUPPKINLYG
AIR PAR D
FOR
NOT MIDLAN

S UPPLY
PUS O
HT

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
1
2

ASS

HIGH
IDLE
nn
ATranlliso
smissio

Figure 17.

NOTE
Dashboard parking brake indicator will illuminate when PARKING
BRAKE control is applied.
3. Pull out PARKING BRAKE control (2).

CAUTION
Use wheel chocks when uncoupling tractor vehicle from semitrailer. Fail-
ure to comply may result in damage to equipment.

NOTE
• If semitrailer is parked on level ground; put one wheel chock in front
of tire on one side and one wheel chock in back of tire on other side
of tractor vehicle.
• If semitrailer is parked uphill; place one wheel chock on each side of
semitrailer in back of tire.
• If semitrailer is parked downhill; place one wheel chock on each side
of semitrailer in front of tire.
4. Chock semitrailer wheels.

0043-16
 TM 9-2320-341-10 0043

CHOCK

LEVEL GROUND
CHOCK
CHOCK

UPHILL
CHOCK
CHOCK

DOWNHILL
CHOCK

Figure 18.

0043-17
 TM 9-2320-341-10 0043

5. Set HYD ENABLE switch (3) to ON position. MAIN HYD ENABLE indicator (4) will
illuminate.

4
3
INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT
ILER

PULL TO
TRA SUPPLYING
AIR PARKND
FOR

LY
NOT MIDLA

S U PP
PU S H T O

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
12

ASS

HIGH
IDLE

isoissionn
AllTransm

Figure 19.
6. Prepare M870A3 semitrailer for uncoupling (refer to TM 5-2330-325-14&P). (WP
0146)
7. Set PTO ENGAGE switch (3) to OFF position. Indicator light (4) will go out.
8. Ensure two hydraulic hoses (5) are disconnected from tractor vehicle and semitrailer.
Stow two hydraulic hoses in semitrailer toolbox (6).

Figure 20.

9. Ensure handbrake control (7) off.

0043-18
 TM 9-2320-341-10 0043

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2
3
M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

8 7

Figure 21.
10. Pull out TRAILER AIR SUPPLY control (8).

NOTE
• Disconnect blue (service) tractor vehicle air brake line gladhand from
blue (service) semitrailer gladhand.
• Disconnect red (emergency) tractor vehicle air brake line gladhand
from red (emergency) semitrailer gladhand.
11. Disconnect tractor vehicle air brake lines (9) from semitrailer gladhands (10) and stow
on tree (11).

0043-19
 TM 9-2320-341-10 0043

13
10

11

12

14

Figure 22.

12. Disconnect inter-vehicular wiring harness (12) from semitrailer 24V electrical connector
(13) and tractor vehicle 24V electrical connector (14). Return inter-vehicular wiring
harness (12) to tractor vehicle stowage.

NOTE
Fifth wheel has two lock release handles.

0043-20
 TM 9-2320-341-10 0043

13. Pull fifth wheel secondary lock release handle (15) completely out as far as it will go.

16

15

Figure 23.

14. Pull out fifth wheel primary lock release handle (16) and hook it in out position.
15. Drive tractor vehicle slowly forward for approximately 4 ft. (1.2 m), or until semitrailer
kingpin is clear of fifth wheel, and semitrailer is on ground. Stop tractor vehicle.

END OF TASK

END OF WORK PACKAGE

0043-21
 TM 9-2320-341-10 0044

OPERATOR MAINTENANCE
START ENGINE

INITIAL SETUP:

Not Applicable

START COLD ENGINE

WARNING

Do not start, crank engine, or move vehicle when anyone is near, working
on, or working under vehicle. Failure to comply may result in injury or
death to personnel.

WARNING

Keep away from moving engine parts, alternator belts, and pulleys while
engine is running. Failure to comply may result in injury or death to per-
sonnel.

NOTE
• Ensure that 24V battery disconnect switch is set to ON position (WP
0074) before attempting to start engine.
• Dashboard parking brake indicator will illuminate when PARKING
BRAKE control is applied.
1. Pull out PARKING BRAKE control (1).

0044-1
 TM 9-2320-341-10 0044

4
2
INTER-
AXLE
8X8

B.O.
SELECT
B.O.
LIGHTS
EXHAUST
1

PULL TO
ER
LY
TRAILSUPPKING
AIR PAR
FOR AND

SUPPLY
NOT MIDL
PU S H T O

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
12

ASS

HIGH
IDLE

AlTranlissmisonsion

Figure 1.

2. Set ignition switch (2) to ON position.

3. Set transmission range selector (3) to N (neutral).

NOTE
Perform Step (4) up to seven times. If engine does not start after eight
attempts, notify field level maintenance.
4. Push engine start switch (4) for no longer than 15 seconds, or until engine starts.

NOTE
• Engine start switch will spring back to off position when released.
• Brake system failure (LOW AIR) indicator may illuminate and buzzer
may sound upon engine start.
5. Release engine start switch (4) immediately after engine starts.

CAUTION
• Do not position engine start switch to start position while motor is
running. Failure to comply may result in damage to equipment.
• If engine fails to start, repeat Step (4) up to seven times. If engine
doesn't start after eight starting attempts, notify field level
maintenance.
• If oil pressure gauge does not show engine oil pressure within 10 to
15 seconds after starting engine, immediately shut off engine (WP
0057) and notify field level maintenance. Failure to comply may result
in damage to equipment.

0044-2
 TM 9-2320-341-10 0044

6. With engine at idle (625-725 rpm), check that engine oil pressure gauge (5) reads 15-88
psi (1.03-6.07 bar).

7 11

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

5 9
8 10
AIR BRAKE

Figure 2.

7. Press throttle pedal (6) until tachometer (7) reads 800-1000 rpm.
8. Run engine at 800-1000 rpm for about 5 minutes.

CAUTION
If FRONT and REAR air pressure gauges do not read 60 to 120 psi (4 to
8 bar) after warm-up, shut off engine (WP 0057) and notify field level
maintenance. Failure to comply may result in damage to equipment.
9. Check that FRONT (8) and REAR (9) air pressure gauges read 60 to 120 psi (4 to 8
bar). Brake system failure (LOW AIR) indicator (10) will illuminate and buzzer may
sound until both gauges reach 60 to 75 psi (4 to 5 bar).
10. Check that fuel gauge (11) shows enough fuel to complete mission.

NOTE
Engine coolant temperature gauge may not show reading at engine idle.
11. Check that engine coolant temperature gauge (12) does not read over 219°F (104°C).

0044-3
 TM 9-2320-341-10 0044

13
14
CHEM INTER 25 6.2
ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

243v

15
PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

12
AIR BRAKE

Figure 3.

NOTE
Battery voltage readout is located in the top right corner of the LCD.
12. Check that battery voltage readout (13) reads between 24 and 28 volts.
13. Check that air filter restriction indicator (14) shows yellow.
14. If air filter restriction indicator (14) shows red, press and release RESET button (15).

WARNING

If NBC exposure is suspected, all air filter media should be handled by

personnel wearing protective equipment. Consult your unit NBC Officer
or NBC NCO for appropriate handling or disposal instructions. Failure to
comply may result in injury or death to personnel.

NOTE
Bouncing or jarring of indicator may put indicator in red zone while air
cleaner elements are still good. Turn engine off and press reset button to
recheck indicator.
15. If air filter restriction indicator (14) still shows red and/or VACUUM INCHES H2O
window shows 18, shut off engine (WP 0057) and clean air filter elements. (WP 0140)

0044-4
 TM 9-2320-341-10 0044

START WARM ENGINE

WARNING

Do not start, crank engine, or move vehicle when anyone is near, working
on, or working under vehicle. Failure to comply may result in injury or
death to personnel.

WARNING

Keep away from moving engine parts, alternator belts, and pulleys while
engine is running. Failure to comply may result in injury or death to per-
sonnel.

NOTE
• Ensure that 24V battery disconnect switch is set to ON position (WP
0074) before attempting to start engine.
• Dashboard parking brake indicator will illuminate when PARKING
BRAKE control is applied.
1. Pull out PARKING BRAKE control (1).

0044-5
 TM 9-2320-341-10 0044

4
2
INTER-
AXLE
8X8

B.O.
SELECT
B.O.
LIGHTS
EXHAUST
1

PULL TO
ER
LY
TRAILSUPPKING
AIR PAR
FOR AND

SUPPLY
NOT MIDL
PU S H T O

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
12

ASS

HIGH
IDLE

AlTranlissmisonsion

Figure 4.

2. Set ignition switch (2) to ON position.

3. Set transmission range selector (3) to N (neutral).

NOTE
Perform Step (4) up to seven times. If engine does not start after eight
attempts, notify field level maintenance.
4. Push engine start switch (4) for no longer than 10 seconds, or until engine starts.

NOTE
• Engine start switch will spring back to off position when released.
• Brake system failure (LOW AIR) indicator may illuminate and buzzer
may sound upon engine start.
5. Release engine start switch (4) immediately after engine starts.

CAUTION
If engine oil pressure gauge does not show engine oil pressure within 10
to 15 seconds after starting engine, shut off engine (WP 0057) immedi-
ately and notify field level maintenance. Failure to comply may result in
damage to equipment.

NOTE
• Minimum engine oil pressure for safe operation (vehicle moving) is
30 psi (2 bar).

0044-6
 TM 9-2320-341-10 0044

• At idle, engine oil pressure can drop as low as 5 psi (0.34 bar), this
is a normal condition.
6. Check that engine oil pressure gauge (5) indicates normal operating range of 40 to 70
psi (2.76 to 4.83 bar) at 1800 to 2100 rpm.

11 9
12
CHEM INTER 25 6.2
ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

243v

13
PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

5 10 7
6 8
AIR BRAKE

Figure 5.

7. Check that FRONT (6) and REAR (7) air pressure gauges read 60 to 120 psi (4 to 8
bar). Brake system failure (LOW AIR) indicator (8) will illuminate and buzzer may sound
until both gauges reach 60 to 75 psi (4 to 5 bar).
8. Check that fuel gauge (9) shows enough fuel to complete mission.

NOTE
Engine coolant temperature gauge may not show reading at engine idle.
9. Check that engine coolant temperature gauge (10) does not read over 219°F (104°C).

NOTE
Battery voltage readout is located in the top right corner of the LCD.
10. Check that battery voltage readout (11) reads between 24 and 28 volts.
11. If air filter restriction indicator (12) shows red, press and release RESET button (13).
12. If air filter restriction indicator (12) still shows red and/or VACUUM INCHES H2O
window shows 18, shut off engine (WP 0057) and clean air filter elements. (WP 0140)

END OF TASK

END OF WORK PACKAGE

0044-7
 TM 9-2320-341-10 0045

OPERATOR MAINTENANCE
OPERATE PARKING BRAKES

INITIAL SETUP:

Not Applicable

OPERATE PARKING BRAKES

NOTE
• Vehicle is equipped with automatic parking brake valve (square/yel-
low knob).
• Automatic parking brake valve will apply parking brakes when air
pressure is approximately 30 psi (2 bar) or less.
1. Pull out PARKING BRAKE control (1) to apply, parking brake indicator (2) will illuminate.

1
2

INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT
LER
PULL TO

TRAI PPLYG
AINOTRSU
KIN D
FORPAR LAN
S UPPLY

MID
PUS O
HT

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
1
2

ASS

HIGH
IDLE
nn
ATranlliso
smissio

Figure 1.

0045-1
 TM 9-2320-341-10 0045

2. Push in PARKING BRAKE control (1) to release, parking brake indicator (2) will go out.

END OF TASK

END OF WORK PACKAGE

0045-2
 TM 9-2320-341-10 0046

OPERATOR MAINTENANCE
OPERATE SERVICE BRAKES

INITIAL SETUP:

Not Applicable

OPERATE SERVICE BRAKES

WARNING

Do not press service brake treadle hard three or four times in a row. Air
supply will be used up and service brakes will not work until air is built up
again. Failure to comply may result in injury or death to personnel.
1. Make sure FRONT (1) and REAR (2) air pressure gauges both read at least 100 psi (7
bar) before operating vehicle.
2. Push down and hold service brake pedal (3) as needed to slow or stop vehicle.

0046-1
 TM 9-2320-341-10 0046

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE
2
1

Figure 1.

END OF TASK

END OF WORK PACKAGE

0046-2
 TM 9-2320-341-10 0047

OPERATOR MAINTENANCE
OPERATE TRAILER BRAKES

INITIAL SETUP:

Not Applicable

OPERATE TRAILER BRAKES

WARNING

Trailer handbrake control is used only when testing trailer brakes. Do not
use trailer handbrake control while driving or the trailer may skid and
jackknife, causing an accident. Failure to comply may result in injury or
death to personnel.
1. Slowly pull trailer handbrake control (1) down to test application of trailer brakes.
2. Push trailer handbrake control (1) up to test release of trailer brakes.

0047-1
 TM 9-2320-341-10 0047

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE
1

Figure 1.

END OF TASK

END OF WORK PACKAGE

0047-2
 TM 9-2320-341-10 0048

OPERATOR MAINTENANCE
OPERATE TRANSMISSION AND TRANSFER CASE

INITIAL SETUP:

Not Applicable

OPERATE TRANSMISSION

CAUTION
If transmission range selector flashes current range selection while op-
erating vehicle (shift selection is inhibited), DO NOT shut off engine or
attempt to change range selection. Shutting off engine may result in the
inability to select a drive range at startup, and diagnostic data may be
lost. Move vehicle to safe place and notify field level maintenance as soon
as possible (refer to limp home/transmission fault for more information).
(WP 0101)

NOTE
• When transmission oil is below 19°F (-7 C), the only gears available
are R (reverse), N (Neutral), and 3 (third gear range) when D (drive)
is selected. The remaining gears in D (drive) will not be available until
transmission oil in sump warms above 19°F (-7 C).
• The transmission range selector has six buttons and digital display
window. The six buttons are: R (reverse), N (neutral), D (drive), up
arrow, down arrow, and MODE. The transmission has five forward
gears.
• The MODE button located on the transmission range selector does
not perform any operator function.
• The digital display window on the transmission range selector will
display R (reverse), N (neutral), or the number 1 through 5,
depending on gear range selected.
• The lowest gear of any gear range is always first gear.
• When transmission is set to D (drive), 5 (fifth gear range) is
automatically chosen and displayed in the digital display window.
• When engine brake is activated and vehicle is decelerating, 2
(second gear range) will be displayed in the digital display window.

0048-1
 TM 9-2320-341-10 0048

1. Press the N (neutral) button (1) for the following:

a. Start engine. (WP 0044)

6
3
INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT

PULL TO
ER
TRAILSUPPLYING
AIR PARK
FOR AND

LY
NOT MIDL

SU PP
PU S H T O

CHEM
ALARM

AUX
HYD HYD
ENABLE
GPPU

4
ASS
M
12
M

1
HIGH
IDLE
n
AllTransisomission

Figure 1.

b. Park vehicle. (WP 0056)

c. Perform stationary power takeoff.
d. Shift transfer case.
e. Operate auxiliary equipment.
2. Press the D (drive) button (2) or R (reverse) button (3) depending on directional
required:
a. R (Reverse) button (3):
(1) Drive vehicle in reverse. (WP 0051)
b. D (Drive) (2):
(1) Drive in normal conditions.
(2) Drive vehicle forward (WP 0050) from a stop.

NOTE
When setting a new transmission operating range, the top gear of the
desired operating range must be chosen and displayed on the transmis-
sion range selector digital display.
3. Complete the following if a lower gear range is required:
a. Using the up arrow button (4) or down arrow button (5), adjust the digital display
window (6) until top gear of desired transmission operating range is displayed:

0048-2
 TM 9-2320-341-10 0048

NOTE
• Use up or down arrow buttons to adjust gear settings as
required.
• Once the arrow buttons are used, the transmission will not
upshift past the gear range displayed in the transmission range
selector digital display, but will downshift normally.
• Press the D (drive) button to return transmission to normal
function (using all gears).
(1) 4 (fourth), 3 (third), or 2 (second) gear range to:
(a) Drive vehicle in off-road conditions. (WP 0053)
(b) Drive vehicle in city traffic and on highway. (WP 0052)
(c) Haul a heavy load.
(d) Drive down moderate grades.
(e) Drive in other conditions as needed.
(2) 1 (first gear range) when:
(a) Maximum pulling power is required.
(b) Drive vehicle up/down steep grade. (WP 0054)
(c) Drive vehicle in slippery conditions. (WP 0055)

OPERATE TRANSFER CASE

1. Start engine. (WP 0044)

4
INTER-
AXLE
8X8
1
B.O.
LIGHTS
B.O.
EXHAUST
SELECT
PULL TO

ER
LY
TRAILSUPPKING
AIR PAR
FOR AND
LY

NOT MIDL
S U PP

3
PUSH TO

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
12

ASS

HIGH
IDLE

AlTranslismissonion

Figure 2.

0048-3
 TM 9-2320-341-10 0048

NOTE
Dashboard parking brake indicator will go out when PARKING BRAKE
control is released.
2. Push in PARKING BRAKE control (1).
3. Set transmission range selector (2) to N (neutral).

CAUTION
• Do not force TRANSFER CASE shift lever. Lever may work hard if
there is drive line windup. Using excessive force on shift lever may
cause damage to shift linkage or change linkage adjustment.
• Do not move TRANSFER CASE shift lever when vehicle is moving,
or when transmission is in gear. Severe damage to drive line may
result.
4. Select transfer case position.

NOTE
If TRANSFER CASE shift lever is hard to move, set transmission range
selector to D, then back to N. If transfer case will not shift, refer to trou-
bleshooting procedures. (WP 0123)
5. Set TRANSFER CASE shift lever (3) to H (HI) for highway driving.

NOTE
Selecting L (LO) position automatically selects 8X8 drive in the vehicle
traction control system.
6. Set TRANSFER CASE shift lever (3) to L (LO) for off-road driving, 8X8 indicator (4) will
illuminate.

END OF TASK

END OF WORK PACKAGE

0048-4
 TM 9-2320-341-10 0049

OPERATOR MAINTENANCE
OPERATE ENGINE BRAKE

INITIAL SETUP:

Not Applicable

OPERATE ENGINE BRAKE

WARNING

Do not use engine brake when vehicle is on slippery surface. If engine

brake is used incorrectly, vehicle may skid out of control. Failure to com-
ply may result in injury or death to personnel.

WARNING

Do not use engine brake on M983 Tractor when operating without a trail-
er. Failure to comply may result in injury or death to personnel.

NOTE
Service brakes must be used in addition to engine brake for optimum
braking capability.
1. Set engine brake high/medium/low switch (1) to low (full down) position.

0049-1
 TM 9-2320-341-10 0049

6
2 3
1 INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT

PULL TO
ER
LY
TRAILSUPPKING
AIR PAR
FOR AND

SUPPLY
NOT MIDL
PU S H T O

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
12
3

ASS

HIGH
IDLE

AlTranlissmisonsion

Figure 1.

2. Set engine brake on/off switch (2) to on (up) position, ENGINE BRAKE ENABLE
indicator (3) will illuminate.
3. Lift foot off throttle pedal (4). Engine brake will automatically slow vehicle.
4. If too much braking occurs, set transmission range selector (5) to a higher range.
5. If more braking is required, set engine brake high/medium/low switch (1) to medium
(center) position, and then high (full up) position (as required).

NOTE
Engine brake operates best when engine speed is between 1650 and
2100 rpm.
6. Check that tachometer (6) reads between 1650 and 2100 rpm whenever engine brake
is used.

END OF TASK

END OF WORK PACKAGE

0049-2
 TM 9-2320-341-10 0050

OPERATOR MAINTENANCE
DRIVE VEHICLE FORWARD

INITIAL SETUP:

Not Applicable

PREPARE VEHICLE

NOTE
If vehicle has less than 500 miles (805 km), check controls and indicators
often during operation and listen for unusual noises or vibrations. Notify
field level maintenance of any problems.
1. Remove and stow wheel chocks. (WP 0072)
2. Ensure trailer spare tire is secured to deck.
3. Adjust air-ride seat and mirrors as needed. (WP 0075)
4. Adjust four-point seatbelt as needed. (WP 0076)
5. Ensure air suspension dump valve control is pinned in ‘service’ position. (WP 0027)
6. Ensure all four suspension ball valves are open. (WP 0040)
7. Ensure tire carrier is secure in raised position.
8. Start engine. (WP 0044)
9. Turn on lights as required.

WARNING

Do not press service brake treadle hard three or four times in a row. Air
supply will be used up and service brakes will not work until air is built up
again. Failure to comply may result in injury or death to personnel.
10. Ensure both (FRONT and REAR) air pressure gauges (1) read at least 100 psi (7 bar)
before driving vehicle.

0050-1
 TM 9-2320-341-10 0050

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 1.

DRIVE VEHICLE FORWARD

1. Drive vehicle in city traffic and on highway. (WP 0052)

2. Drive vehicle in off-road conditions. (WP 0053)
3. Drive vehicle in slippery conditions. (WP 0055)
4. Drive vehicle up/down steep grade. (WP 0054)

END OF TASK

END OF WORK PACKAGE

0050-2
 TM 9-2320-341-10 0051

OPERATOR MAINTENANCE
DRIVE VEHICLE IN REVERSE

INITIAL SETUP:

Not Applicable

PREPARE VEHICLE

1. Remove and stow wheel chocks.

2. Adjust air-ride seat and mirrors as needed. (WP 0075)
3. Adjust four-point seatbelt as needed. (WP 0076)
4. Start engine. (WP 0044)
5. Turn on lights as required.

DRIVE VEHICLE IN REVERSE

WARNING

Do not press service brake treadle hard three or four times in a row. Air
supply will be used up and service brakes will not work until air is built up
again. Failure to comply may result in injury or death to personnel.
1. Make sure both (FRONT and REAR) air pressure gauges (1) read at least 100 psi (7
bar) before driving vehicle.

0051-1
 TM 9-2320-341-10 0051

4
1

INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT
LER

PULL TO
TRAI SUPPKINLYG
AIR PAR D
FOR
NOT MIDLAN

S UPPLY
PUS O
HT

2
CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
1
2

ASS

HIGH
IDLE
nn
ATranlliso
smissio

OFF

AN
.
H.A
SW E
AN
CR

N
S
MA
TRAN

D
LOA

D
LOA

SYST ANDLI LIFT

UN

D H LTI
EM NG
LOA MU
3

Figure 1.

WARNING

Driver has limited vision to rear. Ground guide is required when driving
vehicle in reverse. Failure to comply may result in injury or death to per-
sonnel.

CAUTION
Do not move TRANSFER CASE shift lever when vehicle is moving or
when transmission is in gear. Severe damage to drive line may result.
2. Set TRANSFER CASE shift lever (2) to HI.

NOTE
Reverse alarm will not sound if blackout lighting is selected.
3. Set transmission range selector (3) to R (reverse).

0051-2
 TM 9-2320-341-10 0051

NOTE
Dashboard parking brake indicator will go out when PARKING BRAKE
control is released.
4. Push in PARKING BRAKE control (4).
5. Slowly apply throttle pedal (5).
6. Follow direction from ground guide (as required).

CAUTION
Do not hold steering wheel at full left or full right position for longer than
10 seconds. Oil overheating and pump damage may result.
7. Accelerate, brake, and steer as required.

END OF TASK

END OF WORK PACKAGE

0051-3
 TM 9-2320-341-10 0052

OPERATOR MAINTENANCE
DRIVE VEHICLE IN CITY TRAFFIC AND ON HIGHWAY

INITIAL SETUP:

Not Applicable

OPERATE VEHICLE

WARNING

Speed limits posted on curves reflect speeds that are considered safe for
automobiles. Heavy vehicles with a high center of gravity can roll over at
these speed limits. Use care and reduce your speed below the posted
limit prior to entering a curve. Failure to comply may result in injury or
death to personnel.

CAUTION
Do not move TRANSFER CASE shift lever when vehicle is moving or
when transmission is in gear. Severe damage to drive line will result.
1. Set TRANSFER CASE shift lever (1) to HI.

0052-1
 TM 9-2320-341-10 0052

3
5

INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT

PULL TO
ER
TRAILSUPPKING LY
AIRNOT FORMIDLPARAND

SUPPLY
PU S H T O

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
1
2

ASS

HIGH
IDLE

AlTranlissmisonsion

Figure 1.

2. Set transmission range selector (2) to D (drive).

NOTE
Dashboard parking brake indicator will go out when PARKING BRAKE
control is released.
3. Push in PARKING BRAKE control (3).

CAUTION
Never let engine exceed maximum no-load governed engine speed (ap-
proximately 2170 rpm) or maximum governed engine speed under load
(approximately 2150 rpm). If engine is allowed to go over governed en-
gine speeds, serious engine damage may result.
4. Slowly depress throttle pedal (4) until vehicle reaches desired speed. Tachometer (5)
should read 1650 to 2100 rpm.

CAUTION
Do not hold steering wheel at full left or full right position for longer than
10 seconds. Power steering oil can overheat and pump can be damaged.
5. Accelerate, brake, and steer as required.

0052-2
 TM 9-2320-341-10 0052

NOTE
Check system gauges often during vehicle operation. If gauges read oth-
er than normal, stop engine and troubleshoot problem.
6. Check that fuel gauge (6) shows enough fuel to complete mission.

8 7 6 11 9

CHEM INTER
ALARM AXLE

8X8

10
AUX HYD B.O B.O
ENABLE GPFU
HYD SELECT LIGHTS

M 1
2 M

HIGH 0
1
IDLE 2

Figure 2.

CAUTION
Minimum safe operating engine oil pressure is 40 psi (2.76 bar) at 1200
rpm. If engine oil pressure gauge reads over 88 psi (6.06 bar) or lower
than 40 psi (2.76 bar) at any engine speed of 1200 rpm or higher, shut
off engine (WP 0057), and notify field level maintenance.

NOTE
With engine at idle (625-725 rpm), engine oil pressure can go as low as
15 psi (1.03 bar) or as high as 88 psi (6.06 bar).
7. Check that engine oil pressure gauge (7) reads 40 to 88 psi (2.76 to 6.06 bar) between
1200-2100 rpm.
8. If engine oil pressure gauge indicator (8) illuminates (red), this indicates that an engine
oil pressure fault code has been logged. Shut off engine (WP 0057), and notify field
level maintenance.
9. Check that transmission temperature gauge (9) reads 160 to 220°F (71 to 104°C).
10. If transmission temperature indicator (10) illuminates (red), this indicates that the
transmission temperature is above 250°F (121°C), or torque converter temperature is
above 350° (177°C); park vehicle (WP 0056) and allow transmission to cool. Notify field
level maintenance upon completion of mission.

0052-3
 TM 9-2320-341-10 0052

CAUTION
If transmission range selector flashes current range selection while op-
erating vehicle (shift selection is inhibited), DO NOT SHUT DOWN EN-
GINE OR FURTHER ATTEMPT TO CHANGE TRANSMISSION RANGE
SELECTION. Shutting down engine may result in inability of selecting a
drive range at engine startup (vehicle will be unable to move), and diag-
nostic data will be lost. Move vehicle to safe place for maintenance or
perform limp home/transmission fault emergency procedures. (WP
0101)
11. If check transmission indicator (11) illuminates (amber), there is a potential problem
with the transmission and/or the transmission may need to be serviced. Check for
correct oil level and/or high transmission oil temperature. If indicators are normal,
continue mission and notify field level maintenance as soon as possible.
12. Check that engine coolant temperature gauge (12) reads 180 to 200°F (82 to 93°C).

13 15

CHEM INTER
ALARM AXLE

8X8

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

M 1
2 M

HIGH 0
1
IDLE 2

16 18 17
14 12

Figure 3.

13. If engine coolant temperature gauge (12) reads over 219°F (104°C), idle engine until
water temperature cools. If coolant does not cool, shut off engine (WP 0057) and notify
field level maintenance.
14. If high engine coolant temperature indicator (13) illuminates (red), this indicates the
engine monitoring system has logged a high engine coolant fault code and will cause
the check engine indicator (14) to illuminate (amber). Check engine coolant
temperature gauge (12) and allow engine to cool as necessary. Notify field level
maintenance as soon as possible.
15. If check engine indicator (14) illuminates (amber), engine must be serviced by field level
maintenance as soon as possible.

0052-4
 TM 9-2320-341-10 0052

NOTE
Battery voltage readout is in the top right corner of LCD. (WP 0020)
16. Check that battery voltage readout (15) reads 24 to 28 volts.
17. Check that front air pressure gauge (16) and rear air pressure gauge (17) both read
100 to 130 psi (7 to 9 bar).
18. If low air indicator (18) illuminates (red), perform immediate action for loss of air supply
system pressure emergency procedures. (WP 0078)

END OF TASK

END OF WORK PACKAGE

0052-5
 TM 9-2320-341-10 0053

OPERATOR MAINTENANCE
DRIVE VEHICLE IN OFF-ROAD CONDITIONS

INITIAL SETUP:

Not Applicable

DRIVE VEHICLE IN OFF-ROAD CONDITIONS

NOTE
Vehicle Anti-Lock Brake System (ABS) should always be disabled when
driving vehicle in off-road conditions.
1. Set ABS disable switch (1) to on position, ABS disabled indicator (2) will illuminate.

2
7
1
5
INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT
LER LY
PULL TO

TRAI SUPPKING
AINOTR FORMIDPARLAND
Y
S U P PL

PU S H T O

CHEM
ALARM

GPPU
3
AUX
HYD HYD
ENABLE

M
M
1
2

ASS

HIGH
IDLE

AlTranlissmisonsion

Figure 1.

CAUTION
Do not move TRANSFER CASE shift lever when vehicle is moving or
when transmission is in gear. Severe damage to drive line may result.

0053-1
 TM 9-2320-341-10 0053

NOTE
8x8 indicator (WP 0020) will illuminate when TRANSFER CASE shift lev-
er is positioned to L (LO).
2. Set TRANSFER CASE shift lever (3) to L (LO).
3. Set transmission range selector (4) to 2 (2nd gear range) or 1 (1st gear range), (WP
0048) depending on ground condition.

NOTE
Dashboard parking brake indicator will go out when PARKING BRAKE
control is released.
4. Push in PARKING BRAKE control (5).

CAUTION
Never let engine exceed maximum no-load governed engine speed (ap-
proximately 2170 rpm) or maximum governed engine speed under load
(approximately 2150 rpm). If engine is allowed to go over governed en-
gine speeds, serious engine damage may result.
5. Slowly depress throttle pedal (6) until vehicle reaches desired speed. Tachometer (7)
should read 1650 to 2100 rpm.

CAUTION
Do not hold steering wheel at full left or full right position for longer than
10 seconds. Power steering oil can overheat and pump can be damaged.
6. Accelerate, brake, and steer as required.

NOTE
When off-road driving is completed, enable vehicle Anti-Lock Brake Sys-
tem (ABS).
7. Set ABS disable switch (1) to off position, ABS disabled indicator (2) will go out.

END OF TASK

END OF WORK PACKAGE

0053-2
 TM 9-2320-341-10 0054

OPERATOR MAINTENANCE
DRIVE VEHICLE UP/DOWN STEEP GRADE

INITIAL SETUP:

Not Applicable

DRIVE VEHICLE UP STEEP GRADE

Press and hold throttle pedal (1) all the way down as vehicle moves up grade. Transmission
will automatically downshift gears as needed.

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 1.

DRIVE VEHICLE DOWN STEEP GRADE

CAUTION
• Do not allow speed to go above 2100 RPM when driving downhill, or
damage to engine can result.
• Engine brake operates best when engine speed is between 1650 and
2100 RPM. Transmission torque converter lockup valve may
disengage below 1650 RPM resulting in loss of engine power.
1. Set transmission range selector (1) to lower range as needed to keep engine speed on
tachometer (2) between 1650 and 2100 RPM.

0054-1
 TM 9-2320-341-10 0054

2
INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT

PULL TO
ER
TRAILSUPPKING LY
AIRNOT FORMIDLPARAND

S U P P LY
PU S H T O

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
12

ASS

HIGH
IDLE

AlTranlissmisonsion

1
3

Figure 2.

WARNING

Do not press service brake treadle hard three or four times in a row. Air
supply will be used up and service brakes will not work until air is built up
again. Failure to comply may result in injury or death to personnel.
2. Use service brake pedal (3) as needed to control vehicle speed.
3. Operate engine brake (WP 0049) as required.

END OF TASK

END OF WORK PACKAGE

0054-2
 TM 9-2320-341-10 0055

OPERATOR MAINTENANCE
DRIVE VEHICLE IN SLIPPERY CONDITIONS

INITIAL SETUP:

Not Applicable

OPERATE VEHICLE

CAUTION
Do not move traction control switch while vehicle is moving. Damage to
drive line may result.

NOTE
• The traction control switch has three positions:
.
• After traction control switch is positioned on, let vehicle creep forward
several feet to allow shift collars to fully engage.
1. If TRANSFER CASE shift lever (1) is set to LO, 8X8 is automatically engaged and
indicator light (4) will illuminate. Set traction control switch (2) to INTER AXLE. Indicator
light (3) will come on.

0055-1
 TM 9-2320-341-10 0055

2
3
4
INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT
LER

PULL TO
TRAI SUPPKINLYG
AINOTR FORMIDPARLAND

S U P P LY
PUS O
HT

CHEM
ALARM

1
GPPU

AUX
HYD HYD
ENABLE

M
M
1
2

ASS

HIGH
IDLE
nn
ATranlliso
smissio

OFF

AN
.
H.A
SW E
AN
CR

N
S
MA
TRAN

D
LOA

D
LOA

SYST ANDLI LIFT

UN

D H LTI
EM NG
LOA MU
Figure 1.

2. If TRANSFER CASE shift lever (1) is set to HI, set traction control switch (2) to 8X8.
Indicator light (4) will come on.

CAUTION
Do not move traction control switch while vehicle is moving. Damage to
drive line may result.

NOTE
After traction control switch is positioned off, let vehicle creep forward
several feet to allow shift collars to fully disengage.
3. When vehicle gets good traction again, stop vehicle and set traction control switch (2)
to off (center) position. Indicator light (3 or 4 as applicable) will go out.

END OF TASK

END OF WORK PACKAGE

0055-2
 TM 9-2320-341-10 0056

OPERATOR MAINTENANCE
PARK VEHICLE

INITIAL SETUP:

Not Applicable

OPERATE VEHICLE

1. Lift foot off throttle pedal (1). Let automatic downshifting of transmission slow vehicle.

INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT
PULL TO

ER
LY
TRAILSUPPKING
AIR PAR D
FOR
NOT MIDLAN
SUPPLY

PU S H T O

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
1
2

ASS

HIGH
IDLE
5
AlTranlissmisonsion

1
2

Figure 1.

WARNING

Do not press service brake treadle hard three or four times in a row. Air
supply will be used up and service brakes will not work until air is built up
again. Failure to comply may result in injury or death to personnel.

0056-1
 TM 9-2320-341-10 0056

2. Push down on service brake pedal (2) until vehicle comes to complete stop.

NOTE
Dashboard parking brake indicator illuminates when PARKING BRAKE
control is applied.
3. Pull out PARKING BRAKE control (3).
4. Set transmission range selector (4) to N (neutral).
5. Leave TRANSFER CASE shift lever (5) set to HI or LO.
6. Align front tires in straight-ahead position.
7. Install wheel chocks (WP 0072) as required.

END OF TASK

END OF WORK PACKAGE

0056-2
 TM 9-2320-341-10 0057

OPERATOR MAINTENANCE
SHUT OFF ENGINE

INITIAL SETUP:

Not Applicable

SHUT OFF ENGINE

1. Park vehicle. (WP 0056)

CAUTION
Before shutting down engine, run at reduced speed (800 to 1000 rpm) at
no-load for three to five minutes to allow turbocharger to slow down and
cool off. Turbocharger may be damaged if not allowed to cool off.
2. Push down and hold throttle pedal (1) until tachometer (2) reads 800 to 1000 rpm for
three to five minutes.

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE
3

Figure 1.

3. Lift foot off throttle pedal (1).

0057-1
 TM 9-2320-341-10 0057

CAUTION
Failure to place light switches in OFF position when vehicle is not in use
may cause battery and/or vehicle damage.
4. Turn off lights as required.
5. Set ignition switch (3) to off (down) position.
6. Turn 24V battery disconnect switch (4) to OFF position. (WP 0074)

END OF TASK

END OF WORK PACKAGE

0057-2
 TM 9-2320-341-10 0058

OPERATOR MAINTENANCE
OPERATE RIFLE STOWAGE MOUNT

INITIAL SETUP:

Not Applicable

STOW RIFLE IN STOWAGE MOUNT

1. Position butt (1) of M-16 rifle (2) in lower mount (3) with trigger guard (4) toward rear of
vehicle.

0058-1
 TM 9-2320-341-10 0058

Figure 1.

2. Pull handle (5) of top mount (6) toward middle of cab.

3. Place heat guard (7) of M-16 rifle (2) in top mount (6).
4. Push handle (5) across heat guard (7).
5. Check that M-16 rifle (2) is held tightly.

REMOVE RIFLE FROM STOWAGE MOUNT

1. Pull handle (1) of top mount (2) down and toward middle of cab.

0058-2
 TM 9-2320-341-10 0058

3
1

Figure 2.

2. Remove heat guard (3) of M-16 rifle (4) from top mount (2).
3. Remove butt (5) of M-16 rifle (4) from lower mount (6).

END OF TASK

END OF WORK PACKAGE

0058-3
 TM 9-2320-341-10 0059

OPERATOR MAINTENANCE
PORTABLE WORK LAMP OPERATION

INITIAL SETUP:

Not Applicable

INSTALL/OPERATE/REMOVE PORTABLE WORK LAMP

NOTE
Ensure that 24V battery disconnect switch is ON (WP 0074) before op-
erating work lamp.
1. Remove work lamp (1) and work lamp harness (2) from stowage.

1
2

Figure 1.

2. Mount work lamp (1) on vehicle using magnet (3).

3. Install work lamp harness plug (4) on work lamp terminal (5).
4. Route work lamp harness (2) through driver side door opening (6), between inside of
cab roof (7) and air horn valve hoses (8).

0059-1
 TM 9-2320-341-10 0059

7 8

Figure 2.

5. Route work lamp harness (2) across driver side defroster (9) and across center dash
panel (10) to utility outlet (11).

0059-2
 TM 9-2320-341-10 0059

2 2
9
10

25 6.2
22 5.5
15 3.7
11 2.7
8 2.0

IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

PARKING
BRAKE

13
TRAILER
AIR SUPPLY

11
8 12

14
3

Figure 3.

6. Remove utility outlet cover (12). Insert work lamp harness plug (13) into utility outlet
(11).

NOTE
Ignition switch must be positioned to on for portable work lamp to operate.
7. Turn on work lamp (1) using toggle switch (14).

NOTE
Perform Steps (8) through (13) when use of the portable work lamp is no
longer required.

0059-3
 TM 9-2320-341-10 0059

8. Turn off work lamp (1) using toggle switch (14).

9. Remove work lamp harness plug (13) from utility outlet (11). Install utility outlet cover
(12).
10. Remove work lamp harness (2) from interior of cab.
11. Remove work lamp harness plug (4) from work lamp terminal (5).
12. Disengage magnet (3) from vehicle.
13. Return work lamp (1) and work lamp harness (2) to proper stowage.

END OF TASK

END OF WORK PACKAGE

0059-4
 TM 9-2320-341-10 0060

OPERATOR MAINTENANCE
OPERATE DOME LIGHT

INITIAL SETUP:

Not Applicable

TURN DOME LIGHT ON/OFF

CAUTION
Failure to place light switches in off position when vehicle is not in use
may cause battery and/or vehicle damage.

NOTE
• Dome light is located on very rear of cabin overhead centered
between operator and crew seats.
• Dome light switch is a 2-position switch; down is off, up is on.
• Dome light is disabled when B.O. SELECT switch is positioned on.
• Ensure that the 24V battery disconnect switch is set to ON position
(WP 0074) before operating lights.
1. Set DOME switch (1) to on/off position as required.

0060-1
 TM 9-2320-341-10 0060

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 1.

END OF TASK

END OF WORK PACKAGE

0060-2
 TM 9-2320-341-10 0061

OPERATOR MAINTENANCE
OPERATE PANEL LIGHTS

INITIAL SETUP:

Not Applicable

TURN PANEL LIGHTS ON/OFF

CAUTION
Failure to place light switches in the off position when vehicle is not in use
may cause battery and/or vehicle damage.

NOTE
Ensure that the 24V battery disconnect switch is set to ON position (WP
0074) before operating lights.
1. Set ignition switch (1) to on position.

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 1.

0061-1
 TM 9-2320-341-10 0061

NOTE
• The dimmer switch is a two-position momentary switch. Each
upward/downward momentary depression of the switch will increase/
decrease panel light intensity by 5%.
• Pressing and holding dimmer switch up for 3+ seconds will increase
panel light intensity to 100%.
• Pressing and holding dimmer switch down for 3+ seconds will
decrease panel light intensity to 10%.
2. Adjust panel light brightness using dimmer switch (2).

NOTE
Complete Step (3) when panel lights are no longer required.
3. Set ignition switch (1) to off position.

END OF TASK

END OF WORK PACKAGE

0061-2
 TM 9-2320-341-10 0062

OPERATOR MAINTENANCE
OPERATE PARKING LIGHTS

INITIAL SETUP:

Not Applicable

TURN PARKING LIGHTS ON/OFF

CAUTION
Failure to place light switches in the off position when vehicle is not in use
may cause battery and/or vehicle damage.

NOTE
• The master lighting switch is a three-position switch:
.
• Ensure that the 24V battery disconnect switch is set to ON position
(WP 0074) before operating lights.
• Clearance lights indicator will illuminate whenever master light switch
is moved out of off position.
1. Set master lighting switch (1) up one click to center position, clearance light indicator
(2) will illuminate.

0062-1
 TM 9-2320-341-10 0062

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 1.

NOTE
Complete Step (2) when parking lights are no longer required.
2. Position master lighting switch (1) down one click to off position, clearance light indicator
(2) will go out.

END OF TASK

END OF WORK PACKAGE

0062-2
 TM 9-2320-341-10 0063

OPERATOR MAINTENANCE
OPERATE SERVICE DRIVE LIGHTS

INITIAL SETUP:

Not Applicable

TURN SERVICE DRIVE LIGHTS ON/OFF

CAUTION
Failure to place light switches in the off position when vehicle is not in use
may cause battery and/or vehicle damage.

NOTE
• The master lighting switch is a three-position switch:
.
• Ensure that the 24V battery disconnect switch is set to ON position
(WP 0074) before operating lights.
• For full explanation of clearance lights, go to operate clearance
lights . (WP 0065)
• Clearance lights indicator will illuminate whenever master light switch
is moved out of off position.
1. Position master lighting switch (1) up two clicks to full up position, clearance light
indicator (2) will illuminate. Service headlights (3), composite lights (4), taillights (5),
and clearance lights (6) will illuminate.

0063-1
 TM 9-2320-341-10 0063

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 1.

6 6

3 3

4 5

Figure 2.

NOTE
Service stop lights (incorporated in taillights) will illuminate when service
brake pedal is applied.
2. Press dimmer switch (7) to cycle between high and low headlight beams. High beam
indicator (8) will illuminate (blue) when high beams are selected.

0063-2
 TM 9-2320-341-10 0063

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 3.

NOTE
Complete Step (3) when service drive lights are no longer required.
3. Position master lighting switch (1) down two clicks to off position, clearance light
indicator (2) will go out.

0063-3
 TM 9-2320-341-10 0063

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 4.

END OF TASK

END OF WORK PACKAGE

0063-4
 TM 9-2320-341-10 0064

OPERATOR MAINTENANCE
OPERATE STOPLIGHTS

INITIAL SETUP:

Not Applicable

TURN STOPLIGHTS ON/OFF

NOTE
Ensure that the 24V battery disconnect switch is set to ON position (WP
0074) before operating lights.
1. Stoplights (1) will illuminate when service brake pedal (2) is applied.

CHEM
ALARM
INTER
AXLE
1
8X8

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

M 1
2 M

HIGH 0
1
IDLE 2

AIR BRAKE

Figure 1.

END OF TASK

END OF WORK PACKAGE

0064-1
 TM 9-2320-341-10 0065

OPERATOR MAINTENANCE
OPERATE CLEARANCE LIGHTS

INITIAL SETUP:

Not Applicable

TURN CLEARANCE LIGHTS ON/OFF

CAUTION
Failure to place light switches in the OFF position when vehicle is not in
use may cause battery and/or vehicle damage.

NOTE
• The master lighting switch is a three-position switch:
.
• Ensure that the 24V battery disconnect switch is set to ON position
(WP 0074) before operating lights.
• Clearance lights indicator will illuminate whenever master light switch
is moved out of off position.
1. Set master lighting switch (1) up one or two clicks; clearance light indicator (2) and
clearance lights (3) will illuminate.

0065-1
 TM 9-2320-341-10 0065

2 1

CHEM INTER
ALARM AXLE

8X8

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

M 1
2 M

HIGH 0
1
IDLE 2

Figure 1.

NOTE
Complete Step (2) when clearance lights are no longer required.

0065-2
 TM 9-2320-341-10 0065

2. Set master lighting switch (1) full down to off position; clearance light indicator (2) and
clearance lights (3) will go out.

END OF TASK

END OF WORK PACKAGE

0065-3
 TM 9-2320-341-10 0066

OPERATOR MAINTENANCE
OPERATE BLACKOUT DRIVE LIGHT

INITIAL SETUP:

Not Applicable

TURN BLACKOUT DRIVE LIGHT ON/OFF

CAUTION
Failure to place light switches in the OFF position when vehicle is not in
use may cause battery and/or vehicle damage.

NOTE
• The B.O. LIGHTS switch is a three-position switch:
.
• Ensure that the 24V battery disconnect switch is set to ON position
(WP 0074) before operating lights.
• Use blackout drive light for night driving under blackout conditions.
• Master lighting switch, dome light switch, work light switch, beacon
light switch, electric horn (on steering column), and reverse alarm are
disabled when B.O. SELECT switch is positioned on.
1. Set B.O. SELECT switch (1) to on position.

0066-1
 TM 9-2320-341-10 0066

1 2

CHEM INTER
ALARM AXLE

8X8

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

M 1
2 M

HIGH 0
1
IDLE 2

AIR BRAKE

5
4
3

Figure 1.

2. Set B.O. LIGHTS switch (2) up two clicks. Blackout drive light (3) and blackout markers
(4) will illuminate.
3. Blackout stoplights (5) will illuminate when service brake pedal (6) is applied.

NOTE
Complete Steps (4) and (5) when blackout lights are no longer required.
4. Set B.O. LIGHTS switch (2) down two clicks to off position. Blackout drive light (3) and
blackout markers (4) will go out.
5. Lift switch lock and set B.O. SELECT switch (1) off position.

END OF TASK

END OF WORK PACKAGE

0066-2
 TM 9-2320-341-10 0067

OPERATOR MAINTENANCE
OPERATE BLACKOUT MARKERS

INITIAL SETUP:

Not Applicable

TURN BLACKOUT MARKERS ON/OFF

CAUTION
Failure to place light switches in the OFF position when vehicle is not in
use may cause battery and/or vehicle damage.

NOTE
• The B.O. LIGHTS switch is a three-position switch:
.
• Ensure that the 24V battery disconnect switch is set to ON position
(WP 0074) before operating lights.
• Master lighting switch, dome light switch, work light switch, beacon
light switch, electric horn (on steering column), and reverse alarm are
disabled when B.O. SELECT switch is positioned on.
1. Set B.O. SELECT switch (1) to on position.

0067-1
 TM 9-2320-341-10 0067

1 2

CHEM INTER
ALARM AXLE

8X8

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

M 1
2 M

HIGH 0
1
IDLE 2

AIR BRAKE

4
3

Figure 1.

2. Set B.O. LIGHTS switch (2) up one click to center position. Blackout markers (3) will
illuminate.
3. Blackout stoplight markers (4), which are located on vehicle taillights, will illuminate
when service brake pedal (5) is applied.

NOTE
Complete Steps (4) and (5) when blackout markers are no longer re-
quired.
4. Set B.O. LIGHTS switch (2) one click to off position. Blackout markers (3) will go out.
5. Lift switch lock and set B.O. SELECT switch (1) to off position.

END OF TASK

END OF WORK PACKAGE

0067-2
 TM 9-2320-341-10 0068

OPERATOR MAINTENANCE
OPERATE WORK LIGHTS

INITIAL SETUP:

Not Applicable

TURN WORK LIGHTS ON/OFF

CAUTION
Failure to place light switches in the off position when vehicle is not in use
may cause battery and/or vehicle damage.

NOTE
• Work light switch is disabled whenever blackout lights are selected
on light control switch.
• Ensure that the 24V battery disconnect switch is set to ON position
(WP 0074) before operating lights.
1. Set work light switch (1) to on position, work light indicator (2) will illuminate.

1 2

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 1.

0068-1
 TM 9-2320-341-10 0068

2. Stationary work lights (3) will illuminate. Portable work lights (4) may or may not
illuminate dependant on the position of their individual ON/OFF switches (5).

5 4 5

6 8
7

FORWARD

Figure 2.

NOTE
• Both driver side and passenger side portable work lights are operated
in the same way. Passenger side shown.
• Perform Steps (3) through (6) if use of portable work lights is required.
3. Set switch (5), located on portable work light (4), to on position.
4. Pull quick pin (6) from portable work light (4).
5. Lift portable work light (4) from bracket (7).
6. Unwrap cord (8) from stowage hooks as required.

NOTE
• Both driver side and passenger side portable work lights are operated
in the same way. Passenger side shown.
• Perform Steps (7) through (10) when use of portable work lights is no
longer required.
7. Set switch (5), located on portable work light (4), to off position.

0068-2
 TM 9-2320-341-10 0068

8. Wrap cord (8) onto stowage hooks as required.

9. Insert portable work light (4) into bracket (8).
10. Install quick pin (6) through both portable work light (4) and bracket (7).

NOTE
• Both driver side and passenger side portable work lights are operated
and installed in the same way. Passenger side shown.
• Perform Steps (11) and (12) when use of all work lights is no longer
required.
11. Ensure portable work light switches (5) are turned off and portable work lights (4) are
properly stowed on mounting brackets (7).
12. Set WORK LIGHT switch (1) to off position, work light indicator (2) and all work lights
will go out.

1 2

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 3.

END OF TASK

END OF WORK PACKAGE

0068-3
 TM 9-2320-341-10 0069

OPERATOR MAINTENANCE
PORTABLE BEACON LIGHT OPERATION

INITIAL SETUP:

Not Applicable

INSTALL/REMOVE PORTABLE BEACON LIGHT

NOTE
Ensure that the 24V battery disconnect switch is set to ON position (WP
0074) before operating lights.
1. Remove beacon light (1) from stowage and unwind cord (2).

Figure 1.

2. Place beacon light (1) on driver side front corner of cab roof (3) approximately 12 in.
(30 cm) from driver side cab, and approximately 2 in. (5 cm) from front edge of cab roof.

0069-1
 TM 9-2320-341-10 0069

3 1

Figure 2.

3. Route beacon cord (2) through driver side door opening (4) and between inside of cab
roof (3) and air horn valve hoses (5).

Figure 3.

0069-2
 TM 9-2320-341-10 0069

4. Route beacon cord (2) down left side of driver's windshield (6), across driver side
defroster (7), and across center dash panel (8) to utility outlet (9).

2 2
7 8

25 6.2
22 5.5
15 3.7
11 2.7
8 2.0

IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

PARKING
BRAKE

11
TRAILER
AIR SUPPLY

9
6 3
10

Figure 4.

5. Remove utility outlet cover (10).

NOTE
Ignition switch must be positioned to on for portable beacon light to op-
erate.
6. Insert beacon cord plug (11) into utility outlet (9).

NOTE
Perform Steps (7) through (11) when use of portable beacon light is no
longer required.
7. Remove beacon cord plug (11) from utility outlet (9).
8. Install utility outlet cover (10).
9. Remove beacon cord (2) from interior of cab.
10. Remove beacon light from cab roof (3).
11. Rewind cord (2) and return beacon light (1) to appropriate stowage.

0069-3
 TM 9-2320-341-10 0069

Figure 5.

END OF TASK

END OF WORK PACKAGE

0069-4
 TM 9-2320-341-10 0070

OPERATOR MAINTENANCE
OPERATE TURN SIGNALS

INITIAL SETUP:

Not Applicable

SET TURN SIGNAL ON/OFF

NOTE
• Ensure that the 24V battery disconnect switch is set to ON position
(WP 0074) before operating turn signals.
• If left turn is desired, complete Step (1). If right turn is desired, skip
to Step (2).
1. Set turn signal lever (1) down to left turn position. Left turn indicator (2), and driver side
front (3) and rear (4) composite lights will flash (approximately once per second)
simultaneously.

0070-1
 TM 9-2320-341-10 0070

2 5

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

6 3 4 7

Figure 1.

NOTE
If right turn is desired, complete Step (2).
2. Set turn signal lever (1) up to right turn position. Right turn indicator (5), and passenger
side front (6) and rear (7) composite lights will flash (approximately once per second)
simultaneously.

NOTE
Turn signal level may return to off (center) position automatically once
turn is complete, if this is not the case and/or turn signal is no longer
desired, complete Step (3).

0070-2
 TM 9-2320-341-10 0070

3. Set turn signal control lever (1) to off (center) position. Appropriate turn indicator and
composite lights will go out.

END OF TASK

END OF WORK PACKAGE

0070-3
 TM 9-2320-341-10 0071

OPERATOR MAINTENANCE
OPERATE EMERGENCY FLASHERS

INITIAL SETUP:

Not Applicable

TURN EMERGENCY FLASHERS ON/OFF

NOTE
• Ensure that the 24V battery disconnect switch is set to ON position
(WP 0074) before operating emergency flashers.
• Highway Emergency Marker Kit (WP 0097) should be used to mark
location and caution oncoming traffic whenever vehicle is disabled or
must park in areas where there is other traffic.
1. Push emergency flasher switch (1) in. Both left (2) and right (3) turn indicators, and front
(4) and rear (5) composite lights will flash simultaneously at approximately once per
second.

0071-1
 TM 9-2320-341-10 0071

2 3

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

4 5

Figure 1.

NOTE
Perform Step (2) when emergency flashers are no longer desired.
2. Pull emergency flasher switch (1) out.

END OF TASK

END OF WORK PACKAGE

0071-2
 TM 9-2320-341-10 0072

OPERATOR MAINTENANCE
INSTALL/REMOVE WHEEL CHOCKS

INITIAL SETUP:

Not Applicable

INSTALL WHEEL CHOCKS

NOTE
• Vehicle is equipped with four wheel chocks.
• Always chock tires if vehicle is shut down on uneven terrain.
• Always chock tires if vehicle parking brake is inoperative.
• Ensure local policy for chocking vehicle tires is followed.
1. Remove two wheel chocks (1) from stowage.

Figure 1.
2. Place one wheel chock (1) snugly against both front and rear of tire (No. 1 axle driver
side tire shown).

REMOVE WHEEL CHOCKS

NOTE
• Vehicle is equipped with four wheel chocks.

0072-1
 TM 9-2320-341-10 0072

• Ensure local policy for removing wheel chocks is followed.

1. Remove wheel chocks (1) from both front and rear of tire (No. 1 axle driver side tire
shown).

Figure 2.
2. Return wheel chocks (1) to stowage.
3. Repeat Steps (1) and (2) if more than one wheel is chocked.

END OF TASK

END OF WORK PACKAGE

0072-2
 TM 9-2320-341-10 0073

OPERATOR MAINTENANCE
CHANGE VEHICLE WEIGHT INDICATOR

INITIAL SETUP:

Not Applicable

CHANGE VEHICLE WEIGHT INDICATOR

NOTE
Refer to load classification table for appropriate vehicle weight.
1. Press in bottom of lockplate (1).

2 2

Figure 1.
2. Push lockplate (1) up and off one lockpin (2).
3. Remove number plates (3).
4. Place new number on top of number plates (3).
5. Install number plates (3) on lockpin (4).

0073-1
 TM 9-2320-341-10 0073

6. Push down number plates (3). Slide lockplate (1) on lockpin (2).
7. Repeat Steps (1) through (7) to change other number.

END OF TASK

END OF WORK PACKAGE

0073-2
 TM 9-2320-341-10 0074

OPERATOR MAINTENANCE
OPERATE 24V BATTERY DISCONNECT SWITCH

INITIAL SETUP:

Not Applicable

OPERATE 24V BATTERY DISCONNECT SWITCH

NOTE
All electrical power to the cab is turned ON/OFF by the 24V disconnect
switch.
Turn switch (1) full clockwise (CW) to ON position or full counterclockwise (CCW) to OFF
position as desired.

0074-1
 TM 9-2320-341-10 0074

Figure 1.

END OF TASK

END OF WORK PACKAGE

0074-2
 TM 9-2320-341-10 0075

OPERATOR MAINTENANCE
ADJUST AIR-RIDE SEAT

INITIAL SETUP:

Not Applicable

ADJUST AIR-RIDE SEAT

WARNING

When adjusting seat ride firmness, keep fingers out from under seat.
Failure to comply may result in injury or death to personnel.

NOTE
• Sit in seat and perform Steps (1) through (6) as necessary.
• Driver and crew (passenger side) side seats are adjusted the same
way.
1. Pull out (increase) or push in (decrease) knob (1) to adjust seat ride firmness.

0075-1
 TM 9-2320-341-10 0075

4 5

Figure 1.

2. Move lever (2) away from seat (3) and slide seat (3) forward or backwards.
3. Move lever (2) towards seat (3) to lock seat (3) in place.
4. Pull up lever (4) and lift self off seat (3) to raise, or pull up lever (4) and push down on
seat (3) to lower.
5. Release lever (4) to lock seat (3) in place.
6. Adjust all vehicle mirrors as necessary once driver's seat is properly adjusted.

NOTE
If vehicle is bounced too hard, seat tether may lock seat in down position.
Park vehicle (WP 0056) and perform Steps (7) through (10) to free seat.
7. Push in knob (1) to decrease seat ride firmness.

0075-2
 TM 9-2320-341-10 0075

8. Move lever (2) away from seat (3), and slide seat (3) backwards to relieve tension on
retractor (5).
9. Feed some seat tether (6) into retractor (5) until it releases.
10. Perform Steps (1) through (5) as required to reset seat (3) to desired position.

END OF TASK

END OF WORK PACKAGE

0075-3
 TM 9-2320-341-10 0076

OPERATOR MAINTENANCE
OPERATE FOUR-POINT SEATBELT

INITIAL SETUP:

Not Applicable

OPERATE FOUR-POINT SEATBELT

1. Insert seatbelt flat metal end (1) into buckle (2) until click is heard.

Figure 1.

0076-1
 TM 9-2320-341-10 0076

2. To release seatbelt (3), push in button (4) on buckle (2).

END OF TASK

END OF WORK PACKAGE

0076-2
 TM 9-2320-341-10 0077

OPERATOR MAINTENANCE
LIMP HOME/FLAT TIRE WITH NO SPARE

INITIAL SETUP:

Not Applicable

INSTALL LIMP HOME SETUP ON NO. 1 AND NO. 2 AXLE TIRES

CAUTION
• Do not use this procedure on fully loaded M983A4 or M983A4 LET
vehicle with trailer in tow. Limp home setup will not support extra
weight and equipment may be damaged.
• Vehicle must not be driven faster than 10 mph (16 km/h) or farther
than 30 miles (48 km) in limp home condition.

NOTE
• Use limp home procedure for emergency only in case of wheel
bearing failure, wheel damage, or when unable to change wheel and
tire.
• Limp home setup for passenger side No. 1 axle is shown. All limp
home setups for No.1 and No.2 axle are done in same manner.
1. Drive flat/shredded tire onto two wheel chocks (1).

0077-1
 TM 9-2320-341-10 0077

Figure 1.

2. Dump (deflate) air suspension.

NOTE
The distance between the axle and axle stop should be no greater than
2 in. (5 cm) or the limp home setup will not work as intended.
3. Check axle (2) proximity to axle stop (3).

0077-2
 TM 9-2320-341-10 0077

Figure 2.

NOTE
• If axle is too far from axle stop (more than 2 in. [5 cm]) to effectively
install limp home setup, discontinue procedure and arrange for
vehicle recovery.
• If axle and axle stop are close enough (2 in. [5 cm] or less) to
effectively install limp home setup, continue with Step (4).
4. Remove two wheel chocks (4) and 7 ft. (2.1 m) chain (5) from stowage.

0077-3
 TM 9-2320-341-10 0077

Figure 3.

5. Install two wheel chocks (WP 0072) (4) in front of and behind tire across (on same axle)
from tire in which limp home setup is being installed.

CAUTION
Wrap 7 ft. (2.1 m) chain around frame rail and axle only. Do not wrap 7
ft. (2.1 m) chain around lateral torque rod, shock absorber, etc., as they
could be crushed. Route 7 ft. (2.1 m) chain so hoses or lines are not
between frame and 7 ft. (2.1 m) chain or axle and 7 ft. (2.1 m) chain.
Failure to comply may result in damage to equipment.
6. Route 7 ft. (2.1 m) chain (5) around frame rail (6) and axle (2).

0077-4
 TM 9-2320-341-10 0077

Figure 4.

7. Route end of 7 ft. (2.1 m) chain (5) to chain grab hook (7) and fasten 7 ft. (2.1 m) chain
(5) back into itself as tight as possible.

NOTE
Axle will drop slightly when air suspension is serviced (inflated).
8. Service (inflate) air suspension.
9. Remove and stow two wheel chocks (4) from tire opposite of limp home setup.

Figure 5.

10. Drive vehicle off two wheel chocks (1) and return wheel chocks (1) to vehicle stowage.

0077-5
 TM 9-2320-341-10 0077

Figure 6.

REMOVE LIMP HOME FROM NO. 1 AND NO. 2 AXLE TIRES

1. Dump (deflate) air suspension.

2. Check to see if 7 ft. (2.1 m) chain (1) can be disconnected from grab hook (2).

Figure 7.

0077-6
 TM 9-2320-341-10 0077

NOTE
• If 7 ft. (2.1 m) chain can be disconnected, skip to Step (5).
• If 7 ft. (2.1 m) chain is too tight to disconnect, continue with Step (3).
• Removal of limp home setup No. 1 axle is shown. Removal of limp
home setup for No. 2 axle is done in same manner.
3. Drive flat/shredded tire onto two wheel chocks (3).

Figure 8.

4. Install two wheel chocks (WP 0072) (4) in front of and behind tire across (on same axle)
from tire in which limp home setup is being removed.

Figure 9.
5. Unhook 7 ft. (2.1 m) chain (1) and remove from around frame rail (5) and axle (6).

0077-7
 TM 9-2320-341-10 0077

Figure 10.

6. Return 7 ft. (2.1 m) chain (1) to stowage.

Figure 11.

7. Service (inflate) air suspension.

8. Drive vehicle off two wheel chocks (3) and return wheel chocks (3) to vehicle stowage.

0077-8
 TM 9-2320-341-10 0077

Figure 12.

INSTALL LIMP HOME SETUP ON NO. 3 AND NO. 4 AXLE TIRES

CAUTION
• Do not use this procedure on fully loaded M983A4 or M983A4 LET
vehicle with trailer in tow. Limp home setup will not support extra
weight and equipment may be damaged.
• Vehicle must not be driven faster than 10 mph (16 km/h) or farther
than 30 miles (48 km) in limp home condition. Failure to comply may
result in damage to equipment.

NOTE
• Use limp home procedure for emergency only in case of wheel
bearing failure, wheel damage, or when unable to change wheel and
tire.
• Limp home setup for passenger side No. 4 axle is shown. All limp
home setups for No. 3 and No. 4 axle are done in same manner.
• If possible, place wheel chock under flat/shredded tire to assist in
axle/axle stop proximity before vehicle air suspension is dumped.
1. Drive flat/shredded tire onto two wheel chocks (1).

0077-9
 TM 9-2320-341-10 0077

Figure 13.

2. Dump (deflate) air suspension.

NOTE
The distance between the axle and axle stop should be no greater than
2 in. (5 cm) or the limp home setup will not work as intended.
3. Check axle (2) proximity to axle stop (3).

0077-10
 TM 9-2320-341-10 0077

Figure 14.

NOTE
• If axle and axle stop are close enough (2 in. [5 cm] or less) to
effectively install limp home setup, skip to Step (9).
• If axle is too far from axle stop (more than 2 in. [5 cm]) to effectively
install limp home setup, continue with Step (4).
4. Remove two wheel chocks (4), jack base plate (5), jack (6), 7 ft. (2.1 m) chain (7), and
shackle (8) from stowage.

0077-11
 TM 9-2320-341-10 0077

4 6

Figure 15.

5. Install two wheel chocks (WP 0072) (4) in front of and behind tire across (on same axle)
from tire in which limp home setup is being installed.

CAUTION
Jack placement is critical to avoid damaging vehicle suspension compo-
nents. Follow jack placement notes and procedures carefully. Failure to
comply may result in damage to equipment.

NOTE
Center jack on flat spot in center of transverse beam casting.
6. Place jack base plate (5) and jack (6) under transverse beam casting (9).

0077-12
 TM 9-2320-341-10 0077

10

Figure 16.

7. Unscrew jack ram (10) until it contacts transverse beam end casting (9), or is at full
extension.

NOTE
If axle cannot be jacked close enough to axle stop (2 in. [5 cm] or less)
to effectively install limp home setup, discontinue procedure and arrange
for vehicle recovery.
8. Raise vehicle until axle (2) is as close as it will go to axle stop (3).

0077-13
 TM 9-2320-341-10 0077

Figure 17.

9. Install shackle (8) on axle stop (3) with pin (11).

3
11

Figure 18.

CAUTION
Wrap 7 ft. (2.1 m) chain around axle only. Do not wrap 7 ft. (2.1 m) chain
around shock absorber or brake chamber bracket. Route 7 ft. (2.1 m)
chain so hoses or lines are not between axle and 7 ft. (2.1 m) chain.
Failure to comply may result in damage to equipment.

0077-14
 TM 9-2320-341-10 0077

10. Route 7 ft. (2.1 m) chain (7) through shackle (8).

12
8

7 2

Figure 19.

11. Route end of 7 ft. (2.1 m) chain (7) around axle (2).
12. Bring end of 7 ft. (2.1 m) chain (7) up to chain grab hook (12) and fasten 7 ft. (2.1 m)
chain (7) back into itself as tight as possible.

WARNING

Keep hands away from chain when lowering jack. Hands and fingers
could be crushed. Failure to comply may result in injury or death to per-
sonnel.

NOTE
• If vehicle DID NOT require jacking, skip to Step (15).
• If vehicle DID require jacking, continue with Step (13).
• Axle will drop slightly when jack is lowered.
13. Lower jack (6) and remove jack base plate (5) and jack (6) from under transverse beam
casting (9).

0077-15
 TM 9-2320-341-10 0077

Figure 20.

14. Return jack base plate (5) and jack (6) to stowage.
15. Service (inflate) air suspension.
16. Remove two wheel chocks (WP 0072) (4) from in front of and behind tire across (on
same axle) from tire in which limp home setup was installed.

Figure 21.
17. Drive vehicle off two wheel chocks (1) and return wheel chocks (1) to vehicle stowage.

0077-16
 TM 9-2320-341-10 0077

Figure 22.

REMOVE LIMP HOME SETUP FROM NO. 3 AND NO. 4 AXLE TIRES

1. Dump (deflate) air suspension.

2. Check to see if 7 ft. (2.1 m) chain (1) can be disconnected from grab hook (2).

Figure 23.

0077-17
 TM 9-2320-341-10 0077

NOTE
• If 7 ft. (2.1 m) chain can be disconnected, skip to Step (9).
• If 7 ft. (2.1 m) chain is too tight to disconnect, continue with Step (3).
• Removal of limp home setup No. 4 axle is shown. Removal of limp
home setup for No. 3 axle is done in same manner.
3. Drive flat/shredded tire onto two wheel chocks (3).

Figure 24.

4. Check to see if 7 ft. (2.1 m) chain (1) can be disconnected from grab hook (2).

0077-18
 TM 9-2320-341-10 0077

Figure 25.

NOTE
• If 7 ft. (2.1 m) chain can be disconnected, skip to Step (9).
• If 7 ft. (2.1 m) chain is too tight to disconnect, continue with Step (5).
• Removal of limp home setup No. 4 axle is shown. Removal of limp
home setup for No. 3 axle is done in same manner.
5. Remove two wheel chocks (4), jack base plate (5), and jack (6) from stowage.

4 6

Figure 26.

6. Install two wheel chocks (WP 0072) (4) in front of and behind tire across (on same axle)
from tire in which limp home setup is being installed.

0077-19
 TM 9-2320-341-10 0077

CAUTION
Jack placement is critical to avoid damaging vehicle suspension compo-
nents. Follow jack placement notes and procedures carefully. Failure to
comply may result in damage to equipment.

NOTE
• Jack ram should be fully screwed down (making jack as short as
possible) for Step (7).
• Center jack on flat spot in center of transverse beam casting.
7. Place jack base plate (5), and jack (6) under transverse beam casting (7).

Figure 27.

NOTE
If possible, unscrew jack ram until it contacts jacking point on equalizing
beam.
8. Raise vehicle until axle (8) is as close as it will go to axle stop (9).

0077-20
 TM 9-2320-341-10 0077

2
10

1 8

Figure 28.

9. Unhook 7 ft. (2.1 m) chain (1) from grab hook (2) and remove 7 ft. (2.1 m) chain (1) from
shackle (10) and axle (8).
10. Remove pin (11) from shackle (10) and axle stop (9).

9
11

10

Figure 29.

NOTE
• If vehicle DID NOT require jacking, skip to Step (13).

0077-21
 TM 9-2320-341-10 0077

• If vehicle DID require jacking, continue with Step (11).

11. Lower vehicle until jack (6) and jack base plate (5) can be removed from under
transverse beam casting (7).

Figure 30.

12. Return jack base plate (5) and jack (6) to stowage.

0077-22
 TM 9-2320-341-10 0077

6
1

10

Figure 31.

13. Return 7 ft. (2.1 m) chain (1), and shackle (10) to stowage.
14. Service (inflate) air suspension.

NOTE
Complete Step (15) if vehicle was driven onto two wheel chocks to facil-
itate 7 ft. (2.1 m) chain removal.
15. Drive vehicle off two wheel chocks (3) and return wheel chocks (3) to vehicle stowage.

0077-23
 TM 9-2320-341-10 0077

Figure 32.

END OF TASK

END OF WORK PACKAGE

0077-24
 TM 9-2320-341-10 0078

OPERATOR MAINTENANCE
PERFORM IMMEDIATE ACTION FOR LOSS OF AIR SUPPLY SYSTEM PRESSURE

INITIAL SETUP:

Not Applicable

PERFORM PROCEDURE

1. If brake system failure (LOW AIR) indicator (1) illuminates and warning buzzer sounds
while driving vehicle, check both FRONT (2) and REAR (3) air pressure gauges.

7 8

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2
3
M

HIGH 0 TRAILER
1

5
IDLE 2 AIR SUPPLY

3
6 AIR BRAKE 2
1

Figure 1.

NOTE
If both FRONT and REAR air pressure gauges read zero, skip to Step
(4).
2. If REAR air pressure gauge (3) reads zero and FRONT air pressure gauge (2) reads
normal air pressure of 100 to 130 psi (7 to 9 bar), complete the following:
a. Continue operation of vehicle. Brakes on all eight wheels and trailer (if applicable)
will operate.
b. Notify field level maintenance as soon as possible.

0078-1
 TM 9-2320-341-10 0078

WARNING

When REAR air pressure gauge reads zero, vehicle braking capability is
greatly reduced. Extra care must be taken to avoid collision. Failure to
comply may result in injury or death to personnel.

NOTE
If both FRONT and REAR air pressure gauges read zero, skip to Step
(4).
3. If FRONT air pressure gauge (2) is at zero and REAR air pressure gauge (3) shows
normal air pressure of 100 to 130 psi (7 to 9 bar), complete the following:
a. Continue operation of vehicle. Brakes on No. 3 and No. 4 axles and trailer (if
applicable) will operate. Use caution, and comply with the following:
(1) Leave additional distance between vehicles.
(2) Apply service brake pedal (4) earlier than usual when slowing vehicle.
(3) Downshift as necessary when slowing vehicle.

WARNING

Do not use engine brake when vehicle is on slippery surface. If

engine brake is used incorrectly, vehicle may skid out of control.
Failure to comply may result in injury or death to personnel.
(4) If necessary to slow vehicle, set engine brake high/medium/low switch (5) to
low position and set engine brake on/off switch (6) to on. ENGINE BRAKE
ENABLE indicator (7) will illuminate.
(5) Notify field level maintenance as soon as possible.
4. If both FRONT (2) and REAR (3) air pressure gauges read zero, complete the following:
a. Look for a place to stop vehicle without blocking other traffic.
b. Downshift as needed to control vehicle speed until place is found to stop.

0078-2
 TM 9-2320-341-10 0078

WARNING

Use of service brake pedal will not slow or stop vehicle when both
FRONT and REAR air pressure gauges read zero. Use the following
procedure to safely stop vehicle after loss of air pressure. Failure to
comply may result in injury or death to personnel.

NOTE
• When spring brakes are applied, vehicle will stop quickly. Vehicle
cannot be driven again until malfunction is repaired and there is
enough air supply for operation of service brakes.
• Dashboard parking brake indicator will illuminate when PARKING
BRAKE control is applied.
c. When suitable area is found to stop vehicle, pull out PARKING BRAKE control (8)
to apply spring brakes on four rear wheels.
d. Notify field level maintenance.

END OF TASK

END OF WORK PACKAGE

0078-3
 TM 9-2320-341-10 0079

OPERATOR MAINTENANCE
INSTALL/REMOVE TIRE CHAINS

INITIAL SETUP:

Not Applicable

INSTALL TIRE CHAINS

CAUTION
When tire chains are used, they must be used on all four rear wheels.
Chains must not be used when driving on hard surfaces where there is
no wheel slippage. Improper use of tire chains may result in equipment
damage.

NOTE
• This procedure is a two soldier task.
• Tire chains on No. 3 and No. 4 axle tires are all installed the same.
Passenger side No. 4 axle shown.
• Maximum speed limit for vehicles driving with chains in city or on
highway is 10 mph (16 km/h).
• Maximum speed limit for vehicles driving with chains off-road is 15
mph (24 km/h).
1. With aid of an assistant, place tire chain (1) on ground with cross chain connecting links
(2) facing down.

0079-1
 TM 9-2320-341-10 0079

Figure 1.

NOTE
Assistant shall ensure vehicle is stopped when only tire in contact with
tire chains is tire being equipped.
2. Move vehicle onto tire chain (1) while assistant guides vehicle so tire (3) is about one-
third of way on tire chain.

Figure 2.

NOTE
Ensure only tire in contact with tire chains is tire being equipped.
3. Park vehicle. (WP 0056)
4. With aid of an assistant, wrap tire chain (1) around tire (3).

0079-2
 TM 9-2320-341-10 0079

Figure 3.

5. With aid of an assistant, connect and secure inside and outside clamps (4) so tire chain
(1) is as tight as possible.
6. With aid of an assistant, repeat Steps (1) through (5) on remaining tires of No. 3 and
No. 4 axles.
7. Drive vehicle forward (WP 0050) about 15 ft. (4.6 m) and then drive vehicle in reverse
(WP 0051) about 15 ft. (4.6 m) as guided by assistant.
8. Park vehicle. (WP 0056)

NOTE
Tire chains on No. 3 and No. 4 axle tires are all tightened up the same.
Passenger side No. 4 axle shown.
9. With aid of an assistant, disconnect inside clamp (4) of tire chain (1) on tire (3).

0079-3
 TM 9-2320-341-10 0079

Figure 4.

10. With aid of an assistant, take up slack in tire chain (1).

11. With aid of an assistant, connect inside clamp (4).
12. With aid of an assistant, disconnect outside clamp (4) of tire chain (1) on tire (3).
13. With aid of an assistant, take up slack in tire chain (1).
14. With aid of an assistant, connect outside clamp (4).
15. With aid of an assistant, take up slack in tire chains on other three rear tires by repeating
Steps (10) through (15).

REMOVE TIRE CHAINS

NOTE
• This procedure is a two soldier task.
• Tire chains on No. 4 axle tires are both removed the same. Passenger
side shown.
1. Move vehicle into position so tire chain (1) and clamps (2) on tire (3) are at 4 o’clock
position while assistant guides vehicle.

0079-4
 TM 9-2320-341-10 0079

Figure 5.

2. Park vehicle. (WP 0056)

3. With aid of an assistant, disconnect inside and outside clamps (2) of tire chain (1).

Figure 6.

4. With aid of an assistant, unwrap tire chain (1) from tire (3) and spread tire chain out on
ground behind vehicle.
5. Drive vehicle forward (WP 0050) off tire chain (1) while assistant guides vehicle.
6. With aid of an assistant, repeat Steps (2) through (5) for opposite side tire.

0079-5
 TM 9-2320-341-10 0079

NOTE
Tire chains on No. 3 axle tires are both removed the same. Passenger
side shown.
7. Move vehicle into position so tire chain (4) and clamps (5) on tire (6) are at 8 o’clock
position while assistant guides vehicle.

Figure 7.

8. Park vehicle. (WP 0056)

9. With aid of an assistant, disconnect inside and outside clamps (5) of tire chain (4).
10. With aid of an assistant, unwrap tire chain (4) from tire (6) and spread tire chain out on
ground in front of tire.

Figure 8.

11. Drive vehicle forward (WP 0050) off tire chain (4) while assistant guides vehicle.

0079-6
 TM 9-2320-341-10 0079

12. With aid of an assistant, repeat Steps (7) through (11) for opposite side tire.

END OF TASK

END OF WORK PACKAGE

0079-7
 TM 9-2320-341-10 0080

OPERATOR MAINTENANCE
FORD WATER OBSTACLE

INITIAL SETUP:

Not Applicable

WARNING

Do not ford water unless depth is known. Water deeper than 4 ft. (1.2 m)
may enter vehicle. Failure to comply may result in injury or death to per-
sonnel.

NOTE
After vehicle fords water obstacle, service all lubrication points below
fording depth and check submerged gearboxes for presence of water
upon return from mission (refer to lubrication instructions (WP 0134) for
more information).

CAUTION
Towing a semitrailer or trailer may affect maximum fording depth (refer
to applicable semitrailer/trailer operators manual). Do not ford water ob-
stacle deeper than maximum depth allowed by either tractor vehicle or
semitrailer/trailer (whichever depth is less). Failure to comply may result
in damage to equipment.
1. Ensure depth of fording site is not more than 4 ft. (1.2 m).
2. Ensure bottom at fording site is firm enough that 4 ft. (1.2 m) maximum fording depth
will not be exceeded and vehicle will not become mired.
3. Stop vehicle at edge of water.
4. If brakes have been used heavily and are hot, allow drums and shoes to cool before
entering water if possible.
5. Ensure engine is operating correctly before entering water.
6. Set TRANSFER CASE shift lever (1) to LO, 8X8 drive indicator (2) will illuminate.

0080-1
 TM 9-2320-341-10 0080

INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT

PULL TO
ER
LY
TRAILSUPPKING
AIR PAR
FOR AND

SUPPLY
NOT MIDL
PU S H T O

CHEM
ALARM

GPPU

AUX
HYD HYD

1
ENABLE

M
M
12

ASS

HIGH
IDLE

AlTranlissmisonsion

6 4 2 3

CHEM
ALARM
INTER
AXLE

8X8
25
22
15
11
8
6.2
5.5
3.7
2.7
2.0
7
IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 1.
7. Position traction control switch (3) to INTER AXLE for added traction, indicator (4) will
come on.
8. Set transmission range selector (5) to 1 (1st gear range).
9. Drive vehicle slowly into water.
10. If engine stops, immediately attempt to restart engine. If engine will not start, tow or
winch vehicle from water with another vehicle as soon as possible.
11. Drive vehicle at 3 to 4 mph (5 to 6 km/h) or less, through water.
12. Unless absolutely necessary, do not stop while in water.
13. If vehicle accidentally enters water deeper than 4 ft. (1.2 m), do the following:

0080-2
 TM 9-2320-341-10 0080

a. Apply service brake pedal (6) and hold to stop vehicle.

b. Set transmission range selector (5) to R (reverse).
c. Release service brake pedal (6).
d. Slowly back vehicle out of deep water.
14. After leaving water, lightly press service brake pedal (6) and hold while driving slowly
to dry out brake linings.
15. When clear of fording area, stop vehicle.
16. Apply and release PARKING BRAKE control (WP 0045) (7) several times to remove
water from brake components.
17. Remove water and clean deposits from all vehicle parts as soon as possible.
18. Deliver vehicle to field level maintenance as soon as possible.

END OF TASK

END OF WORK PACKAGE

0080-3
 TM 9-2320-341-10 0081

OPERATOR MAINTENANCE
INTERIM NUCLEAR, BIOLOGICAL, AND CHEMICAL (NBC) DECONTAMINATION
PROCEDURES

INITIAL SETUP:

Not Applicable

INTRODUCTION AND PROCEDURES

NOTE
To reduce the effects of contamination in an NBC-contaminated environ-
ment, the HEMTT series vehicle should be operated with all windows,
doors, and stowage boxes closed.
1. The HEMTT series vehicle is capable of being operated by personnel wearing nuclear,
biological, or chemical (NBC) protective clothing without special tools or supporting
equipment. Refer to FM 3-11.5 (WP 0146) for information on decontamination
procedures. Specific procedures for the HEMTT series vehicle are as follows:
a. Rubber sleeves and other rubber items, rope, and gaskets will absorb and retain
chemical agents. Replacement of these items is the recommended method of
decontamination.
b. Lubricants or fluids may be present on the external surfaces of the HEMTT series
vehicle or its components due to leaks or normal operation. These fluids will absorb
NBC agents. The preferred method of decontamination is removal of these fluids
using conventional decontamination methods in accordance with FM 3-11.5. (WP
0146)
c. Continued decontamination of the external HEMTT series vehicle surfaces with
supertropical bleach (STB)/decontamination solution number 2 (DS2) will degrade
clear plastic (e.g., hydraulic fluid reservoir sight glass) to the point where looking
through it will become impossible. This problem will become more evident for
soldiers wearing protective masks. Therefore, the use of STB or DS2
decontamination in the area of clear plastic should be minimized. Clear plastic
should be decontaminated with warm, soapy water.
d. External surfaces of the HEMTT series vehicle and related equipment such as the
remote control units that are marked with painted or stamped lettering will not
withstand repeated decontamination with STB or DS2 without degradation of this
lettering. Therefore, the recommended method of decontamination for these areas
is washing with warm, soapy water.

0081-1
 TM 9-2320-341-10 0081

NOTE
Replacement of hardware, as well as conventional methods of decon-
tamination, are the preferred methods of decontamination for the areas
listed below.
2. Areas that will entrap contaminants, making efficient decontamination extremely difficult
include the following:
a. Exposed heads of screws.
b. Areas adjacent to and behind exposed hydraulic lines.
c. Hinged areas or access doors on the stowage boxes.
d. Retaining chains for lynchpins and lockpins.
e. Areas around the tiedowns, lifting rings, crevices around access doors, external
valves and drains, and exposed hydraulic connectors.
f. Areas behind knobs, levers, externally-mounted equipment, specification and
advisory data plates, and roller and locking mechanisms.
g. Winch cable and winch hook assembly.
3. Conventional methods of decontamination should be used on all areas listed in Steps
(1) and (2), while stressing the importance of thoroughness, and the probability of some
degree of continuing contact, including vapor hazard.
4. For additional NBC information, refer to FM 3-11.3 (WP 0146) and FM 3-11.4. (WP
0146)

END OF TASK

END OF WORK PACKAGE

0081-2
 TM 9-2320-341-10 0082

OPERATOR MAINTENANCE
OPERATE TIRE CARRIER USING HAND PUMP

INITIAL SETUP:

Not Applicable

LOWER TIRE CARRIER

CAUTION
• Ensure the passenger side of the vehicle has 6 ft. (1.83 m) of
clearance from the battery box forward to accommodate the tire
carrier lowering or damage to equipment may occur.
• Do not dump (deflate) vehicle air suspension system (WP 0036)
when spare tire is attached to tire carrier and in contact with the
ground. Failure to comply may result in damage to equipment.
• Do not add a significant amount of weight to the vehicle when spare
tire is attached to tire carrier and in contact with the ground. Failure
to comply may result in damage to equipment.

NOTE
This procedure is a two soldier task.
1. Remove access ladder from stowage and connect to passenger side front fender. (WP
0034)
2. Disconnect safety pin (1) from right lock rod (2). Leave safety pin (1) hang from its
lanyard (3).

0082-1
 TM 9-2320-341-10 0082

3 1 2

Figure 1.

CAUTION
The tire carrier lock rods are a snag hazard to the movement of the tire
carrier and must be properly stowed in stowage brackets prior to lowering
the tire carrier. Failure to properly stow tire carrier lock rods prior to low-
ering operation may result in damage to equipment.
3. Turn left lock rod (4) CCW until enough slack is made to push left lock rod (4) up and
into its stowage bracket (5).

0082-2
 TM 9-2320-341-10 0082

Figure 2.

4. Turn right lock rod (6) CCW until enough slack is made to push right lock rod (6) up and
into its stowage bracket (7).

Figure 3.

0082-3
 TM 9-2320-341-10 0082

WARNING

If tire carrier is in any position other than full up and locked (tire carrier
latch engaged) or resting on ground, only tire carrier pump operator
should be within six feet (1.83 m) of passenger side of vehicle from battery
box forward. Failure to comply may result in personnel being struck by
tire carrier/spare tire, causing injury or death to personnel.
5. Ensure safety area is clear of personnel and equipment. Assistant will stand outside
the safety area and ensure no personnel wander into safety area while lowering
operation is taking place.

SAFETY
AREA

6 FT (1.83m) SAFETY AREA

Figure 4.

6. Set directional control lever (8) to LOWER position.

0082-4
 TM 9-2320-341-10 0082

10

Figure 5.

7. Remove hand pump handle (9) from stowage, insert into hand pump receptacle (10).
Move hand pump handle (9) up and down rapidly, tire carrier should begin to move.

CAUTION
Once tire is in contact with the ground, do not pump hand pump handle
with directional control lever in LOWER position. This could put undue
stress on tire carrier and may cause damage to equipment.

NOTE
The tire carrier can be stopped at any time during lowering operations by
stopping use of hand pump and moving the directional control lever to
RAISE position.
8. Once tire carrier has passed vertical (approximately 6 in. [15.24 cm] of movement), stop
pumping hand pump handle (9) and allow the tire carrier to lower on its own until spare
tire contacts ground.

0082-5
 TM 9-2320-341-10 0082

9. Move directional control lever (8) to raise position.

RAISE TIRE CARRIER

CAUTION
Ensure the passenger side of the vehicle has 6 ft. (1.83 m) of clearance
from the battery box forward to accommodate the tire carrier lowering or
damage to equipment may occur.

NOTE
This procedure is a two soldier task.
1. If vehicle is not idling, set ignition switch (1) to on position , and check that SPARE TIRE
LOOSE indicator (2) is illuminated.

CHEM INTER
ALARM 25 6.2
AXLE 22 5.5
15 3.7
11 2.7

8X8 8 2.0

IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0
1 TRAILER
IDLE 2
AIR SUPPLY

AIR BRAKE

Figure 6.

2. Ensure spare tire is securely fastened to the tire carrier.

CAUTION
Ensure the passenger side top engine access cover is closed and se-
cured prior to raising the tire carrier with spare tire installed. If access
cover is braced open, spare tire will contact it and cause damage to the
cover as well as prevent the tire carrier from locking in full up position.

NOTE
If passenger side top engine access cover is open and laying flat, the tire
(in the full up position) will not allow the access cover to be closed.

0082-6
 TM 9-2320-341-10 0082

3. Ensure passenger side top engine access cover is secured closed.

CAUTION
The tire carrier lock rods are a snag hazard to the movement of the tire
carrier and must be properly stowed in stowage brackets prior to lowering
the tire carrier. Failure to properly stow tire carrier lock rods prior to low-
ering operation may result in damage to equipment.
4. Ensure left lock rod (3) is properly stowed in stowage bracket (4).

4 3 5 6

Figure 7.

5. Ensure right lock rod (5) is properly stowed in stowage bracket (6).

WARNING

If tire carrier is in any position other than full up and locked (tire carrier
latch engaged) or resting on ground, only tire carrier pump operator
should be within six feet (1.83 m) of passenger side of vehicle from battery

0082-7
 TM 9-2320-341-10 0082

box forward. Failure to comply may result in personnel being struck by

tire carrier/spare tire, causing injury or death to personnel.
6. Ensure safety area is clear of personnel and equipment. Assistant will stand outside
the safety area and ensure no personnel wander into safety area while raising operation
is taking place.

SAFETY
AREA

6 FT (1.83m) SAFETY AREA

Figure 8.

7. Set directional control lever (7) to RAISE position.

0082-8
 TM 9-2320-341-10 0082

Figure 9.

8. Remove hand pump handle (8) from stowage, insert into hand pump receptacle (9).
Move hand pump handle (8) up and down rapidly, tire carrier should begin to move.

NOTE
The tire carrier can be stopped at any time during raising operations.
9. Continue to raise tire carrier until it is in the full up position. Stop use of hand pump.

WARNING

Always maintain a distance of six feet (1.83 m) until confirmation that tire
carrier latch is engaged. Failure to comply may result in personnel being

0082-9
 TM 9-2320-341-10 0082

struck by tire carrier/spare tire causing severe injury or death to person-

nel.
10. Maintaining a safe distance of 6 ft. (1.83 m), the assistant will check the tire carrier latch
(10), ensuring it has fully engaged the tire carrier arm bar (11).

11 10

Figure 10.

11. With the assistant maintaining the safety area, the operator will proceed to the driver
side cabin and check to ensure the SPARE TIRE LOOSE indicator (2) has gone out.

0082-10
 TM 9-2320-341-10 0082

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 11.

NOTE
• If tire carrier latch is fully engaged, and SPARE TIRE LOOSE indi-
cator light has gone out, skip to Step (15).
• If tire carrier latch fails to fully engage tire carrier bar, or SPARE TIRE
LOOSE indicator fails to go out, perform Steps (12) through (14).
12. Move directional control lever (7) to LOWER.

0082-11
 TM 9-2320-341-10 0082

Figure 12.

13. Pump hand pump handle (8) until tire carrier lowers approximately 1 ft. (30 cm).
14. Repeat Steps (7) through (11).

NOTE
If tire carrier latch is fully engaged, and SPARE TIRE LOOSE indicator
light has gone out, complete Steps (15) through (20).
15. Remove right lock rod (5) from stowage bracket (6) and pull down to end of groove (12)
until it stops. Turn right lock rod (5) CW until it is hand tight, with jointed end (13) across
tire carrier arm (14).

0082-12
 TM 9-2320-341-10 0082

3 15 5

17 13

6
4

16 12

14

Figure 13.

16. Remove left lock rod (3) from stowage bracket (4), locate washer (15) and pull towards
left lock rod (3) until it stops. Pull both left lock rod (3) and washer (15) down to end of
groove (16). Turn left Lock rod (4) CW until it is hand tight, with jointed end (17) pointed
towards tire carrier arm (14).
17. Insert safety pin (18) through hole located on right lock rod jointed end (13).

0082-13
 TM 9-2320-341-10 0082

18

13

Figure 14.

NOTE
Tire carrier directional control lever should always be in LOWER position
for vehicle operation.
18. Set directional control lever (7) to LOWER position.

0082-14
 TM 9-2320-341-10 0082

Figure 15.

19. Shut off engine (WP 0057) or set ignition switch (1) to off position (as applicable).

0082-15
 TM 9-2320-341-10 0082

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 16.

20. Stow access ladder. (WP 0034)

END OF TASK

END OF WORK PACKAGE

0082-16
 TM 9-2320-341-10 0083

OPERATOR MAINTENANCE
OPERATE TIRE CARRIER USING OUTSIDE AIR SOURCE

INITIAL SETUP:

Not Applicable

LOWER TIRE CARRIER

CAUTION
• Ensure the passenger side of the vehicle has 6 ft. (1.83 m) of
clearance from the battery box forward to accommodate the tire
carrier lowering or damage to equipment may occur.
• Do not dump (deflate) vehicle air suspension system (WP 0036)
when spare tire is attached to tire carrier and in contact with the
ground. Failure to comply may result in damage to equipment.
• Do not add a significant amount of weight to the vehicle when spare
tire is attached to tire carrier and in contact with the ground. Failure
to comply may result in damage to equipment.

NOTE
This procedure is a two soldier task.
1. Remove access ladder from stowage and connect to passenger side front fender. (WP
0034)
2. Disconnect safety pin (1) from right lock rod (2). Leave safety pin (1) hang from its
lanyard (3).

0083-1
 TM 9-2320-341-10 0083

3 1 2

Figure 1.

CAUTION
The tire carrier lock rods are a snag hazard to the movement of the tire
carrier and must be properly stowed in stowage brackets prior to lowering
the tire carrier. Failure to properly stow tire carrier lock rods prior to low-
ering operation may result in damage to equipment.
3. Turn left lock rod (4) CCW until enough slack is made to push left lock rod (4) up and
into its stowage bracket (5).

0083-2
 TM 9-2320-341-10 0083

Figure 2.

4. Turn right lock rod (6) CCW until enough slack is made to push right lock rod (6) up and
into its stowage bracket (7).

Figure 3.

0083-3
 TM 9-2320-341-10 0083

WARNING

If tire carrier is in any position other than full up and locked (tire carrier
latch engaged) or resting on ground, only tire carrier pump operator
should be within six feet (1.83 m) of passenger side of vehicle from battery
box forward. Failure to comply may result in personnel being struck by
tire carrier/spare tire, causing injury or death to personnel.
5. Ensure safety area is clear of personnel and equipment. Assistant will stand outside
the safety area and ensure no personnel wander into safety area while lowering
operation is taking place.

SAFETY
AREA

6 FT (1.83m) SAFETY AREA

Figure 4.

6. Set directional control lever (8) to LOWER position.

0083-4
 TM 9-2320-341-10 0083

9
11

10

Figure 5.

7. Remove cap from auxiliary air fitting (9).

8. Connect air hose (10) to auxiliary air fitting (9).

NOTE
• It may be necessary to simultaneously hold lever on air hose with tire
carrier pump power control dependant on type air hose used.
• The operator will notice a small amount of oil being expelled with the
air from the tire carrier pump each time it cycles, this is a normal
condition.
9. Press and hold power control (11). The tire carrier pump cyclic rate will be rapid at first,
and then slow noticeably. As cyclic rate slows, the operator should notice tire carrier
begin to move.

0083-5
 TM 9-2320-341-10 0083

CAUTION
Once tire is in contact with the ground, do not press power control with
directional control lever in LOWER position. This could put undue stress
on tire carrier and may cause damage to equipment.

NOTE
The tire carrier can be stopped at any time during lowering operations by
releasing the power control and moving the directional control lever to
RAISE position.
10. Once tire carrier has passed vertical (approximately 6 in. [15.24 cm] of movement),
release power control (11) and allow tire carrier to lower on its own until tire contacts
ground.
11. Move directional control lever (8) to raise position.

RAISE TIRE CARRIER

CAUTION
Ensure the passenger side of the vehicle has 6 ft. (1.83 m) of clearance
from the battery box forward to accommodate the tire carrier lowering or
damage to equipment may occur.

NOTE
This procedure is a two soldier task.
1. If vehicle is not idling, set ignition switch (1) to on position , and check that SPARE TIRE
LOOSE indicator (2) is illuminated.

0083-6
 TM 9-2320-341-10 0083

CHEM INTER
ALARM 25 6.2
AXLE 22 5.5
15 3.7
11 2.7

8X8 8 2.0

IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0
1 TRAILER
IDLE 2
AIR SUPPLY

AIR BRAKE

Figure 6.

2. Ensure spare tire is securely fastened to the tire carrier.

CAUTION
Ensure the passenger side top engine access cover is closed and se-
cured prior to raising the tire carrier with spare tire installed. If access
cover is braced open, spare tire will contact it and cause damage to the
cover as well as prevent the tire carrier from locking in full up position.

NOTE
If passenger side top engine access cover is open and laying flat, the tire
(in the full up position) will not allow the access cover to be closed.
3. Ensure passenger side top engine access cover is secured closed.

CAUTION
The tire carrier lock rods are a snag hazard to the movement of the tire
carrier and must be properly stowed in stowage brackets prior to lowering
the tire carrier. Failure to properly stow tire carrier lock rods prior to low-
ering operation may result in damage to equipment.
4. Ensure left lock rod (3) is properly stowed in stowage bracket (4).

0083-7
 TM 9-2320-341-10 0083

4 3 5 6

Figure 7.

5. Ensure right lock rod (5) is properly stowed in stowage bracket (6).

WARNING

If tire carrier is in any position other than full up and locked (tire carrier
latch engaged) or resting on ground, only tire carrier pump operator
should be within six feet (1.83 m) of passenger side of vehicle from battery
box forward. Failure to comply may result in personnel being struck by
tire carrier/spare tire, causing injury or death to personnel.
6. Ensure safety area is clear of personnel and equipment. Assistant will stand outside
the safety area and ensure no personnel wander into safety area while raising operation
is taking place.

0083-8
 TM 9-2320-341-10 0083

SAFETY
AREA

6 FT (1.83m) SAFETY AREA

Figure 8.

7. Set directional control lever (7) to RAISE position.

0083-9
 TM 9-2320-341-10 0083

8
10

Figure 9.

8. Remove cap from auxiliary air fitting (8).

9. Connect air hose (9) to auxiliary air fitting (8).

NOTE
• It may be necessary to simultaneously hold lever on air hose with tire
carrier pump power control dependant on type air hose used.
• The operator will notice a small amount of oil being expelled with the
air from the tire carrier pump each time it cycles, this is a normal
condition.
• When the power control is pressed, the tire carrier pump cyclic rate
will be rapid at first, and then slow noticeably. As cyclic rate slows,
the operator should notice the tire carrier begin to move.
10. Press and hold power control (10).

0083-10
 TM 9-2320-341-10 0083

NOTE
• The tire carrier can be stopped at any time during raising operations
by releasing power control.
• As the tire carrier is raised, the tire carrier pump will begin to cycle at
an increased rate.
11. Continue to raise tire carrier until it is in the full up position. The operator will notice a
significant slow down in the tire carrier pump cyclic rate. Release power control (10).

WARNING

Always maintain a distance of six feet (1.83 m) until confirmation that tire
carrier latch is engaged. Failure to comply may result in personnel being
struck by tire carrier/spare tire causing severe injury or death to person-
nel.
12. Maintaining a safe distance of 6 ft. (1.83 m), the assistant will check the tire carrier latch
(11), ensuring it has fully engaged the tire carrier arm bar (12).

0083-11
 TM 9-2320-341-10 0083

12 11

Figure 10.

13. With the assistant maintaining the safety area, the operator will proceed to the driver
side cabin and check to ensure the SPARE TIRE LOOSE indicator (2) has gone out.

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 11.

0083-12
 TM 9-2320-341-10 0083

NOTE
• If tire carrier latch is fully engaged, and SPARE TIRE LOOSE indi-
cator light has gone out, skip to Step (17).
• If tire carrier latch fails to fully engage tire carrier bar, or SPARE TIRE
LOOSE indicator fails to go out, perform Steps (14) through (16).
14. Move directional control lever (7) to LOWER.

10

Figure 12.

15. Press power control (10) until tire carrier lowers approximately 1 ft. (30 cm).
16. Repeat Steps (7) through (13).

NOTE
If tire carrier latch is fully engaged, and SPARE TIRE LOOSE indicator
light has gone out, complete Steps (17) through (22).

0083-13
 TM 9-2320-341-10 0083

17. Remove right lock rod (5) from stowage bracket (6) and pull down to end of groove (13)
until it stops. Turn right lock rod (5) CW until it is hand tight, with jointed end (14) across
tire carrier arm (15).

3 16 5

18 14

6
4

17 13

15

Figure 13.

18. Remove left lock rod (3) from stowage bracket (4), locate washer (16) and pull towards
left lock rod (3) until it stops. Pull both left lock rod (3) and washer (16) down to end of
groove (17). Turn left lock rod (3) CW until it is hand tight, with jointed end (18) pointed
towards tire carrier arm (15).
19. Insert safety pin (19) through hole located on right lock rod jointed end (14).

0083-14
 TM 9-2320-341-10 0083

19

14

Figure 14.

NOTE
Tire carrier directional control lever should always be in LOWER position
for vehicle operation.
20. Set directional control lever (7) to LOWER position.

0083-15
 TM 9-2320-341-10 0083

Figure 15.

21. Shut off engine (WP 0057) or set ignition switch (1) to off position (as applicable).

0083-16
 TM 9-2320-341-10 0083

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 16.

22. Stow access ladder. (WP 0034)

END OF TASK

END OF WORK PACKAGE

0083-17
 TM 9-2320-341-10 0084

OPERATOR MAINTENANCE
SELF-RECOVER VEHICLE USING SELF-RECOVERY WINCH

INITIAL SETUP:

Not Applicable

WINCH MIRED VEHICLE FORWARD

NOTE
• For additional information on vehicle self-recovery, refer to FM
4-30.31. (WP 0146)
• Vehicle self-recovery is a two soldier task. Soldiers must
communicate by hand signals.
1. Shut off engine. (WP 0057)
2. Adjust mirror (1) so assistant can be clearly seen during procedure.

Figure 1.
3. Pull out hydraulic selector valve control.

0084-1
 TM 9-2320-341-10 0084

HYDRAULIC SELECTOR
VALVE CONTROL

Figure 2.
4. Start engine. (WP 0044)
5. Move winch shift lever (4) to OUT position to pay out small amount of cable.
6. Release winch shift lever (4) to center position.
7. Set PTO ENGAGE switch (2) to OFF position. Indicator light (3) will go out.
8. Remove cotter pin (5) from pin (6).

0084-2
 TM 9-2320-341-10 0084

5
8 6
7

Figure 3.
9. Remove pin (6) from clevis (7) and disconnect clevis (7) from tiedown ring (8).

WARNING

• Always wear protective gloves when handling winch cable. Never let
cable run through hands. Frayed cables can cut severely. Failure to
comply may result in injury or death to personnel.
• Never operate winch with less than five wraps of cable on winch
drum. Failure to comply may result in injury or death to personnel.
10. Route winch cable (9) around, and over top of winch (10) toward front of vehicle (as
shown).

0084-3
 TM 9-2320-341-10 0084

10 M977 SHOWN

Figure 4.
11. Move winch shift lever (4) to OUT and pay out winch cable (9), while assistant routes
cable (9) through notch in fender (11).

NOTE
• Do not place cable between tensioning device pulleys at this time.
• When pulling cable through tensioning device, push sheave towards
frame rail to allow clevis to pass through.
12. Pay out cable (9) while assistant pulls cable (9) until it is 6 in. to 1 ft. (15 cm to 30 cm)
past the front roller guide (12).

0084-4
 TM 9-2320-341-10 0084

12

M977 SHOWN
13 13

15

9 14

Figure 5.
13. Stop paying out cable (9).
14. Assistant routes cable (9) through cable guide (13), over sheave (14), between roller
(15), and side of cable guide (13).
15. Pay out winch cable (9) as assistant routes cable over first axle and 1 ft. (30 cm) past
front roller guide assembly (12).

0084-5
 TM 9-2320-341-10 0084

9
M977 SHOWN

12

Figure 6.
16. Set PTO ENGAGE switch (2) to OFF position. Indicator light (3) will go out.
17. Remove quick release pin (16) and guide bracket (17). Move cable guide brackets (18)
apart so cable (9) can be placed against bottom of sheave (19).
18. Move cable guide brackets (18) together and install guide bracket (17) and quick
release pin (16).
19. Set PTO ENGAGE switch (2) to ON position. Indicator light (3) will illuminate.
20. Move winch shift lever (4) to OUT and pay out winch cable (9) while assistant pulls cable
to tree, another heavy vehicle (WP 0086), or another heavy object refer to FM 4-30.31.
(WP 0146)
21. When winch cable (9) is let out to heavy object, release winch shift lever (4) to center
position.
22. Set PTO ENGAGE switch (2) to OFF position. Indicator light (3) will go out.
23. If snatch block must be used for self-recovery operation, attach self-recovery winch
cable (9) to snatch block (WP 0085) and connect end of self-recovery winch cable to
mired vehicle left front towing eye. (WP 0086) Attach snatch block to tree, another
vehicle, or heavy object refer to FM 4-30.31. (WP 0146)

0084-6
 TM 9-2320-341-10 0084

CAUTION
There must always be at least five wraps of cable on winch. If load is
applied with less than five wraps of cable on winch, cable may come loose
on drum.
24. Check that there are at least five wraps of winch cable (9) left on winch (10). If there
are not at least five wraps of winch cable left on self-recovery winch, stop using self-
recovery winch and continue with Step (54) of this procedure.

CAUTION
Do not go over winch pull capacity or winch may be damaged.
25. Ensure weight of mired vehicle and amount of winch cable (9) left on self-recovery winch
(10) does not go over pull capacity (refer to FM 4-30.31 (WP 0146) and Self-Recovery
Winch Pull Capacity table below). If pull will go over capacity, stop using self-recovery
winch and continue with Step (54) of this procedure.

Table 1. Self-Recovery Winch Pull Capacity.

Cable Layer Maximum Line Pull

1st layer (five wraps) 20,000 lbs (9 080 kg)

2nd layer 18,173 lbs (8 251 kg)

3rd layer 16,663 lbs (7 565 kg)

4th layer 15,361 lbs (6 974 kg)

5th layer 14,254 lbs (6 471 kg)

NOTE
If winch cable will be connected to another vehicle acting as a stationary
anchor, refer to FM 4-30.31 (WP 0146) or Connect/Disconnect Self-Re-
covery Winch Cable to Another Vehicle (WP 0086) for connecting pro-
cedures.
26. If it is determined using self-recovery winch (10) will not go over winch pull capacity,
connect winch cable (9) to heavy object.
27. Ensure winch shift lever (4) is at center position.
28. Ensure PTO ENGAGE switch (2) is set to OFF position. Indicator light (3) will go out.
29. Put winch cable (9) between tensioning device pulleys (21).
30. Release tension pulley lever (20).

0084-7
 TM 9-2320-341-10 0084

31. Check that winch cable (9) rests inside grooves of both tensioning device pulleys (21)
and sheave (22).
32. Check that winch cable (9) is not caught on vehicle or any other objects.

WARNING

Keep all personnel clear of area near winch cable when tension is on
cable. Failure to comply may result in injury or death to personnel.
33. Ensure all personnel are clear of self-recovery winch (10) and winch cable (9).
34. Set PTO ENGAGE switch (2) to ON position. Indicator light (3) will illuminate.
35. Move winch shift lever (4) to IN until slack is out of cable.
36. Release winch shift lever (4) to center position.
37. Ensure TRACTION CONTROL lever (24) is set to INTER-AXLE DIFF. LOCK.
38. Apply service brake pedal (25).
39. Set transmission range selector (26) to 1 (1st gear range).
40. Release service brake pedal (25).
41. Move winch shift lever (4) to IN and apply slight pressure to throttle pedal (27).

NOTE
Keep winch cable tight at all times so cable does not get tangled with
vehicle.
42. Adjust position of throttle pedal (27) to change engine speed as needed to keep winch
cable (9) tight and vehicle moving.
43. When mired vehicle is on solid ground, release winch shift lever (4) to center position.
44. Park vehicle. (WP 0056)
45. Set winch shift lever (4) to OUT and pay out winch cable (9) until all tension is off cable.
46. When all tension is off winch cable (9), release winch shift lever (4) to center position.
47. Set PTO ENGAGE switch (2) to OFF position. Indicator light (3) will go out.

NOTE
If winch cable is connected to another vehicle, refer to Connect/Discon-
nect Self-Recovery Winch Cable to Another Vehicle (WP 0086) for dis-
connecting procedures.

0084-8
 TM 9-2320-341-10 0084

48. Disconnect winch cable (9) from heavy object.

49. If snatch block was used, disconnect end of winch cable (10) from vehicle and remove
snatch block from winch cable and from tree, other vehicle, or heavy object refer to FM
4-30.31. (WP 0146)

CAUTION
Do not reel clevis end of winch cable through roller guides. Clevis may
catch on roller guide and cause cable or roller guide to break.
50. Set PTO ENGAGE switch (2) to ON position. Indicator light (3) will illuminate.
51. Move winch shift lever (4) to IN.

WARNING

• Always wear protective gloves when handling winch cable. Never let
cable run through hands. Frayed cables can cut severely. Failure to
comply may result in injury or death to personnel.
• Never operate winch with less than five wraps of cable on winch
drum. Failure to comply may result in injury or death to personnel.
52. Reel in winch cable (9) while assistant uses tire iron extension handle to guide cable
(9) onto self-recovery winch (10) so cable wraps are level across face of self-recovery
winch (10).
53. When end of cable (9) is near front of vehicle, release winch shift lever (4) to center
position.
54. Set PTO ENGAGE switch (2) to OFF position. Indicator light (3) will go out.
55. Remove quick release pin (16) and guide bracket (17). Move cable guide brackets (18)
apart so winch cable (9) can be removed from sheave (19).

0084-9
 TM 9-2320-341-10 0084

M977 SHOWN

19
9

18
18
17 16

Figure 7.
56. Move cable guide bracket (18) together. Install guide bracket (17) and quick release
pin (16).
57. Pull back and hold tension pulley lever (20).

0084-10
 TM 9-2320-341-10 0084

M977 SHOWN
21
13

20 22

9 21

Figure 8.
58. Lift winch cable (9) out of tensioning device pulleys (21).
59. Release tension pulley lever (20).
60. Pull winch cable (9) back and out of cable guide (13).
61. While assistant guides winch cable (9), move winch shift lever (4) to IN.
62. When clevis (7) is approximately 2 ft. (61 cm) from winch (10), release winch shift lever
(4) to center position.
63. Set PTO ENGAGE switch (2) to OFF position. Indicator light (3) will go out.
64. Assistant routes end of winch cable (9) down along front face of winch (10).

0084-11
 TM 9-2320-341-10 0084

10

9 28
7

Figure 9.
65. Assistant routes end of winch cable (9) under winch (10) and out through hole in bottom
of rear winch frame (28).
66. Set PTO ENGAGE switch (2) to ON position. Indicator light (3) will illuminate.

WARNING

Keep all personnel clear of area near winch cable when tension is on
cable. Failure to comply may result in injury or death to personnel.
67. Order all personnel to stand clear of area near winch (10).

CAUTION
Do not reel in winch cable too tightly. If too much tension is applied, cable
or tiedown ring can break, or winch may be damaged.
68. Once assistant and all other personnel are clear of area, move winch shift lever (4) to
IN and take all slack out of winch cable (9).
69. When winch cable (9) is tight, release winch shift lever (4) to center position.
70. Set PTO ENGAGE switch (2) to OFF position. Indicator light (3) will go out.
71. Shut off engine. (WP 0057)
72. Push in hydraulic selector valve control.

0084-12
 TM 9-2320-341-10 0084

HYDRAULIC SELECTOR
VALVE CONTROL

Figure 10.
73. Adjust mirror (1) for driving.

Figure 11.

END OF TASK

END OF WORK PACKAGE

0084-13
 TM 9-2320-341-10 0085

OPERATOR MAINTENANCE
SNATCH BLOCK INSTALLATION/REMOVAL

INITIAL SETUP:

Not Applicable

ATTACH SNATCH BLOCK TO SELF-RECOVERY WINCH CABLE

1. Remove snatch block (1) from stowage.

Figure 1.

2. Remove screw (2).

3. Move plate (3) to side to open snatch block (1).
4. Place winch cable (4) in snatch block (1).
5. Close plate (3) and align holes.
6. Install screw (2).
7. Ensure screw (2) is tight and winch cable (4) can be moved freely through snatch block
(1).
8. Continue with self-recovery operation (WP 0084).

0085-1
 TM 9-2320-341-10 0085

REMOVE SNATCH BLOCK FROM SELF-RECOVERY WINCH CABLE

1. Check that there is enough slack in winch cable (1).

Figure 2.

2. Remove screw (2).

3. Move plate (3) to side to open snatch block (4).
4. Take winch cable (1) out of snatch block (4).
5. Close plate (3) and align holes.
6. Install screw (2).
7. Stow snatch block (4) in stowage box.
8. Continue with self-recovery operation (WP 0084).

END OF TASK

END OF WORK PACKAGE

0085-2
 TM 9-2320-341-10 0086

OPERATOR MAINTENANCE
CONNECT/DISCONNECT SELF-RECOVERY WINCH CABLE TO ANOTHER VEHICLE

INITIAL SETUP:

Not Applicable

CONNECT CABLE TO VEHICLE

CAUTION
When attaching self-recovery winch cable to another vehicle, that vehicle
must be used only as an anchor point or damage to equipment can result.

NOTE
There are three tiedown rings on each side of vehicle.
1. Unscrew one tiedown ring (1) from mounting plate (2).

Figure 1.
2. Remove lifting shackle (3) from stowage.

0086-1
 TM 9-2320-341-10 0086

Figure 2.

3. Insert lifting shackle (3) through tiedown ring (1).

4. Connect lifting shackle (3) to left front of left rear tow eye (4) with pin (5).
5. Install cotter pin (6).
6. Connect self-recovery winch cable (7) with clevis (8) to tiedown ring (1) with pin (9).
7. Install cotter pin (10).
8. Continue with self-recovery winch operation (WP 0084).

DISCONNECT CABLE FROM VEHICLE

1. Ensure there is enough slack in winch cable (1).

0086-2
 TM 9-2320-341-10 0086

6
2

4
1 5 9
3 8 7

Figure 3.

2. Remove cotter pin (2).

3. Remove pin (3) and disconnect clevis (4) from tiedown ring (5).
4. Remove cotter pin (6).
5. Remove pin (7) and disconnect lifting shackle (8) from tow eye (9).
6. Remove tiedown ring (5) from lifting shackle (8).
7. Stow lifting shackle (8).

NOTE
There are three tiedown rings on each side of vehicle.
8. Install tiedown ring (5) into mounting plate (10).

0086-3
 TM 9-2320-341-10 0086

10

Figure 4.
9. Continue with self-recovery winch operation (WP 0084).

END OF TASK

END OF WORK PACKAGE

0086-4
 TM 9-2320-341-10 0087

OPERATOR MAINTENANCE
TOW DISABLED VEHICLE

INITIAL SETUP:

Not Applicable

TOW DISABLED VEHICLE

CAUTION
• When towing another vehicle, do not go over GCWR given in
equipment data (WP 0006). Failure to comply may result in damage
to equipment.
• Propeller shaft must be removed by field level maintenance before
towing disabled vehicle or equipment may be damaged.

NOTE
Disabled vehicles must be prepared and moved in accordance with FM
21-305 . If instructed to do so, manually release spring brakes (WP
0098) as part of preparing disabled vehicle for towing.
1. Install and operate portable beacon lights. (WP 0069)
2. Set TRANSFER CASE shift lever (1) to NEUT (neutral) position.
3. Set traction control switch (2) to off (center) position.

0087-1
 TM 9-2320-341-10 0087

2 3
4

INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT
LER

PULL TO
TRAI SUPPKINLYG
AIR PAR D
FOR
NOT MIDLAN

S UPPLY
PUS O
HT

CHEM
ALARM

GPPU
1
AUX
HYD HYD
ENABLE

M
M
1
2

ASS

HIGH
IDLE
nn
ATranlliso
smissio

Figure 1.
4. Push in PARKING BRAKE control on disabled vehicle (refer to operator's manual).
5. Push in TRAILER AIR SUPPLY control (4) on recovery vehicle.
6. Transport disabled vehicle.

END OF TASK

END OF WORK PACKAGE

0087-2
 TM 9-2320-341-10 0088

OPERATOR MAINTENANCE
CONNECT/DISCONNECT TOW BAR

INITIAL SETUP:

Not Applicable

CONNECT TOW BAR

WARNING

Do not use 10-ton tow bar with self-guided coupler (normally found on
some M1120 LHS and M1977 CBT models). Self-guided coupler is not
compatible with 10-ton tow bar. Failure to comply may result in injury or
death to personnel

WARNING

Tow bar is heavy. Do not attempt to lift or move tow bar without the aid
of two assistants and a lifting device. Failure to comply may result in injury
or death to personnel.

NOTE
• This procedure is a three soldier task.
• The 10-ton tow bar should always be used in conjunction with two 16
ft. (5 m) safety chains.
• Allow ample distance between towing vehicle and disabled vehicle
to connect 10-ton tow bar.
1. Align rear of towing vehicle near front of disabled vehicle.

0088-1
 TM 9-2320-341-10 0088

WARNING

Tow bar is heavy. Do not attempt to lift or move tow bar without the aid
of two assistants and a lifting device. Failure to comply may result in injury
or death to personnel.
2. With aid of two assistants and a lifting device, remove tow bar (1) from stowage.

Figure 1.

3. Remove cotter hairpin (2) and pin (3) from tow bar (1).
4. Separate tow bar (1) at pivot point (4).

NOTE
Towing eyes on all models of HEMTT series vehicles are same in ap-
pearance, operation, and location. HEMTT M977 shown.
5. Position legs of tow bar (1) in front of disabled vehicle with spare pins (5) facing up.

0088-2
 TM 9-2320-341-10 0088

M977 BASE/A2

1
1
2 5
3
9

7
6
8

Figure 2.

M977 A4

1
1
5
2
3 9

7
6
8

Figure 3.
6. Remove two cotter hairpins (6) and pins (7) from tow bar shackles (8).

0088-3
 TM 9-2320-341-10 0088

WARNING

Tow bar is heavy. Do not attempt to lift or move tow bar without the aid
of two assistants and a lifting device. Failure to comply may result in injury
or death to personnel.
7. While two assistants hold one leg of tow bar (1) and align shackle (8) with towing eye
(9), install pin (7) and cotter hairpin (6).
8. Repeat Step (7) for other leg of tow bar (1).
9. Align legs of tow bar (1) at pivot point (4) and install pin (3) and cotter hairpin (2).

WARNING

Do not use 10-ton tow bar with self-guided coupler (normally found on
some M1120 LHS and M1977 CBT models). Self-guided coupler is not
compatible with 10-ton tow bar. Failure to comply may result in injury or
death to personnel

NOTE
Pintle hook on all models of HEMTT series vehicles are same in appear-
ance, operation, and location. HEMTT M977 shown.
10. Position the towing vehicle so pintle hook is aligned with tow bar lunette eye.
11. Remove cotter pin (10) from pintle hook (11).

0088-4
 TM 9-2320-341-10 0088

11 M977
12

13

10

Figure 4.
12. Remove cotter pin (10) from pintle hook (11).

0088-5
 TM 9-2320-341-10 0088

M977
11
12

13

10

Figure 5.
13. Pull latch (12) away from vehicle and hold.
14. Lift top of pintle hook (11) and let go of latch (12). Pintle hook (11) will be locked open.

WARNING

Tow bar is heavy. Do not attempt to lift or move tow bar without the aid
of two assistants and a lifting device. Failure to comply may result in injury
or death to personnel.

0088-6
 TM 9-2320-341-10 0088

WARNING

Do not put hands near pintle hook while aligning lunette eye with pintle
hook. Failure to comply may result in injury or death to personnel.
15. While two assistants lift tow bar (1), slowly back up towing vehicle until tow bar lunette
eye (13) connects to pintle hook (11).
16. Pull latch (12) and close top half of pintle hook (11).
17. Install cotter pin (10) in pintle hook (11).

NOTE
If air system of disabled vehicle is damaged, manually release spring
brakes (WP 0098) and skip to Step (20).
18. Remove two inter-vehicular air lines (14) from stowage.

M977
M977

18
15
19

14 17 16

Figure 6.

0088-7
 TM 9-2320-341-10 0088

NOTE
If air system of disabled vehicle is damaged, manually release spring
brakes (WP 0098) and skip to Step (20).
19. Remove two inter-vehicular air lines (14) from stowage.

M977 M977
18
15
19

14 17 16

Figure 7.

NOTE
Gladhands on all models of HEMTT series vehicles are same in appear-
ance, operation, and location. HEMTT M977 shown.
20. Connect first intervehicular air line (14) to driver side rear gladhand (15) of towing
vehicle and driver side front gladhand (16) of disabled vehicle.
21. Connect second intervehicular air line (17) to passenger side rear gladhand (18) of
towing vehicle and passenger side front gladhand (19) of disabled vehicle.
22. Remove two 16 ft. (5 m) safety chains (20) from stowage.

NOTE
• Both driver side and passenger side walking beams are same. Driver
side shown.
• If disabled vehicle is either a BASE or A2 model HEMTT series
vehicle (refer to data plate on inside of drivers door), complete Step
(21). If disabled vehicle is an A4 model HEMTT series vehicle (refer
to data plate on inside of drivers door), skip to Step (22).
23. Route one 16 ft. (5 m) safety chain (20) over walking beam (21) behind No. 1 axle (22)
on disabled vehicle, and hook 16 ft. (5 m) safety chain (20) back into itself under walking
beam (21) as shown.

0088-8
 TM 9-2320-341-10 0088

22

20
21

BASE/A2 MODELS

Figure 8.

CAUTION
Special care should be taken when connecting 16 ft. (5 m) safety chain
to tiedown ring. The procedure listed below routes the 16 ft. (5 m) safety
chain in such a way as to minimize excessive contact with vehicle air
suspension air springs during towing. Failure to comply may result in
damage to equipment.

NOTE
Both driver side and passenger side tiedown rings are same. Driver side
shown.
24. Connect 16 ft. (5 m) safety chain (20) to disabled vehicle tiedown ring (23):
a. Route end (without safety shackle) of 16 ft. (5 m) safety chain (20) through tiedown
ring (23) from inboard to outboard until grab hook (24) hangs just below bottom of
air spring (25).

0088-9
 TM 9-2320-341-10 0088

23

25

20 24

Figure 9.
b. Hook 16 ft. (5 m) safety chain (20) back to itself. Grab hook (24) should open
towards ground (shown) when tension is applied to 16 ft. (5 m) safety chain (20).

24

20

Figure 10.
25. Repeat Steps (21) or (22) for other side of disabled vehicle.

0088-10
 TM 9-2320-341-10 0088

NOTE
• 16 ft. (5 m) safety chain may be attached to either safety chain loop
or towing shackles.
• 16 ft. (5 m) safety chain should be attached so they are just above,
but not in contact with the ground.
26. Route free ends of two 16 ft. (5 m) safety chain (20) through safety chain loop (26) on
towing vehicle and attach each 16 ft. (5 m) safety chain (20) back into itself as shown.

26 20

Figure 11.

27. Tow disabled vehicle. (WP 0087)

DISCONNECT TOW BAR

NOTE
• This procedure is a three soldier task.
• Vehicle should be parked and disconnected on level ground.
1. Park towing vehicle. (WP 0056)
2. Pull out TRAILER AIR SUPPLY control (1) on towing vehicle.

0088-11
 TM 9-2320-341-10 0088

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE 1

Figure 12.

NOTE
If disabled vehicle parking brake is inoperable and/or spring brakes on
disabled vehicle were manually released, install wheel chocks (refer to
operator's manual).
3. Engage parking brake on disabled vehicle (refer to operator's manual).
4. Disconnect two 16 ft. (5 m) safety chains (2) from towing vehicle and disabled vehicle.
Return 16 ft. (5 m) safety chains (2) to stowage.

0088-12
 TM 9-2320-341-10 0088

M977 M977
4
4

3 3 5

Figure 13.

NOTE
If spring brakes on disabled vehicle were manually released before tow-
ing, skip to Step (6).
5. Disconnect two intervehicular air lines (3) from towing vehicle rear gladhands (4) and
from disabled vehicle front gladhands (5). Return intervehicular air lines (5) to stowage.
6. Remove cotter pin (6) from towing vehicle pintle hook (7).

0088-13
 TM 9-2320-341-10 0088

9 7

11
6 10

Figure 14.

7. Pull latch (9) away from vehicle and hold.

8. Lift top of pintle hook (7) and let go of latch (9). Pintle hook (7) will be locked open.
9. As two assistants lift tow bar (10) until lunette eye (11) is clear of pintle hook (10), drive
towing vehicle forward approximately 15 ft. (4.6 m).
10. As assistants lower tow bar (10) to the ground, park towing vehicle.
11. Pull latch (9) to close towing vehicle pintle hook (7) and install cotter pin (6) in pintle
hook (7).
12. Remove cotter hairpin (12) and pin (13) and separate tow bar (10) at pivot point (14).

0088-14
 TM 9-2320-341-10 0088

M977 BASE/A2

10
10
12
13
9

16
15
17

14

Figure 15.

M977 A4

1
10

12
13 9

16
15
17

14

Figure 16.

0088-15
 TM 9-2320-341-10 0088

13. With aid of an assistant, hold one leg of tow bar (10) while another assistant removes
cotter hairpin (15) and pin (16) from shackle (17).
14. Repeat Step (13) for other leg of tow bar (10).
15. With aid of two assistants, lower tow bar (10) to the ground.
16. Install two pins (16) and cotter hairpins (15) is shackles (17).
17. Align legs of tow bar (10) at pivot point (14) and install pin (13) and cotter hairpin (12).

WARNING

Tow bar is heavy. Do not attempt to lift or move tow bar without the aid
of two assistants and a lifting device. Failure to comply may result in injury
or death to personnel.
18. With aid of two assistants and lifting device, return tow bar (10) to stowage.

END OF TASK

END OF WORK PACKAGE

0088-16
 TM 9-2320-341-10 0089

OPERATOR MAINTENANCE
OPERATE VEHICLE IN EXTREME HEAT

INITIAL SETUP:

Not Applicable

EXTREME HEAT OPERATION

CAUTION
• When operating vehicle in very hot temperatures of above 100°F (38°
C), extra care must be taken to prevent overheating engine
(temperatures over 230°F (110°C) and transmission (temperatures
over 300°F, 149°C). Watch water and transmission temperature
gauges closely. Failure to comply may result in damage to
equipment.
• Check oil levels often and keep operating strain as low as possible.
Vehicle cooling and lubrication systems support each other. Failure
of one system will rapidly cause failure of other systems.

NOTE
• Close heater valves to improve the efficiency of cabin air
conditioning.
• Closing the heater valves disables cabin heat.
1. Keep operating temperatures as low as possible:
a. Set transmission range selector (1) to N (neutral) while engine is running and not
required to move.
b. Use low gear ranges only when necessary.
c. Stop vehicle for cooling off periods, and idle engine as often as possible. Let engine
idle for approximately 3 minutes before shutting down. Idling will cool engine faster
than quick shutdown and may prevent damage from remaining engine heat.
d. Check oil levels often. Oil seals are more likely to leak in extreme hot weather.
e. Check air filter restriction indicator (2) frequently. If indicator shows red:
(1) Park vehicle. (WP 0056)
(2) Shut off engine. (WP 0057)

0089-1
 TM 9-2320-341-10 0089

(3) Notify field level maintenance.

2
3 4
7
INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT

PULL TO
ER
LY
TRAILSUPPKING
AIR PAR
FOR AND

SUPPLY
NOT MIDL
PU S H T O

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
1
2

ASS

HIGH
IDLE

AlTranlissmisonsion

Figure 1.

2. If transmission temperature gauge (3) reads 300°F (149°C) or above, perform the
following steps:
a. Slow vehicle.
b. Set transmission range selector (1) to next lower gear range.
c. Continue operation.
d. When transmission temperature gauge (3) reads normal range:
(1) Set transmission range selector (1) to normal gear range.
(2) Continue operation.
e. If transmission temperature gauge (3) does not return to normal range:
(1) Stop vehicle.
(2) Set transmission range selector (1) to N (neutral).

NOTE
Dashboard parking brake indicator will illuminate when PARKING
BRAKE control is applied.
(3) Pull out PARKING BRAKE control (4).

0089-2
 TM 9-2320-341-10 0089

(4) Allow transmission to cool.

f. When transmission temperature gauge (3) reads normal range:
(1) Apply service brake pedal (5).

NOTE
Dashboard parking brake indicator will go out when PARKING
BRAKE control is released.
(2) Push in PARKING BRAKE control (4).
(3) Set transmission range selector (1) to normal gear range.
(4) Continue operation.
3. If water temperature gauge (6) indicates coolant temperature is near overheating,
perform the following steps:
a. Slow vehicle.
b. Set transmission range selector (1) to next lower gear range.
c. Continue operation.
d. When water temperature gauge (6) reads normal range:
(1) Set transmission range selector (1) to normal gear range.
(2) Continue operation.
e. If water temperature gauge (6) does not return to normal range:
(1) Stop vehicle.
(2) Set transmission range selector (1) to N (neutral).

NOTE
Dashboard parking brake indicator will illuminate when PARKING
BRAKE control is applied.
(3) Pull out PARKING BRAKE control (4).
(4) Allow engine to cool.
f. When water temperature gauge (6) reads normal range:
(1) Apply service brake pedal (5).

NOTE
Dashboard parking brake indicator will go out when PARKING
BRAKE control is released.
(2) Push in PARKING BRAKE control (4).

0089-3
 TM 9-2320-341-10 0089

(3) Set transmission range selector (1) to normal gear range.

(4) Continue operation.
4. Check cooling system often and notify field level maintenance if any of the following are
found:
a. Low coolant level in radiator.
b. Leaking hose connections which have been tightened but still leak.
c. Cracked or leaking hoses.
d. Radiator or charge air cooler fins/grill plugged with mud, debris, etc.

NOTE
• Batteries do not hold charge well in extreme heat.
• Battery will be tagged (white circle printed on top) for use in extreme
heat conditions as specific gravity must be changed to adjust for heat
(refer to TM 9-6140-200-14).
5. Keep batteries full, but do not overfill. Check battery electrolyte daily.
6. In hot, damp climates check body and chassis often and notify field level maintenance
if any of the following are found:
a. Signs of pitting or paint blistering on metal surfaces.
b. Signs of mildew, mold, or fungus on fabrics and rubber.
7. Adjust lubrication intervals as specified in applicable Lubrication Table.
8. Park vehicle (WP 0056) in sheltered area, out of wind if possible. If no shelter is
available, park so vehicle does not face into wind.

END OF TASK

END OF WORK PACKAGE

0089-4
 TM 9-2320-341-10 0090

OPERATOR MAINTENANCE
OPERATION IN EXTREME DUST

INITIAL SETUP:

Not Applicable

OPERATE VEHICLE IN EXTREME DUST

CAUTION
Clouds of dust can scratch glass surfaces. Keep glass surfaces covered
as much as possible in these conditions to prevent scratching.
1. Leave glass surfaces covered if not needed for operations. Take extra care when
cleaning glass to prevent scratching surfaces.
2. Keep close watch on air filter restriction indicator (1) located on top right side of driver’s
instrument panel.

2 1

PARKING
BRAKE

TRAILER
AIR SUPPLY

AIR BRAKE

Figure 1.
3. Continuously scan gauges and indicators on driver’s instrument panel (2) to be sure
dust does not affect equipment.
4. Allow as much distance as possible between vehicles and operate at low speeds.

0090-1
 TM 9-2320-341-10 0090

5. At stops, check and drain fuel/water separator (3).

Figure 2.
6. When possible, park vehicle so it does not face into wind.

FIFTH WHEEL ASSEMBLY CONSIDERATIONS IN EXTREME DUST

NOTE
Clean and re-lubricate fifth wheel parts more often when vehicle is oper-
ated in sandy or dusty conditions. Lubricate daily under severe operating
conditions (refer to PMCS - weekly procedures (WP 0131) for more in-
formation).
1. Continuously clean dust deposits from fifth wheel components.

END OF TASK

END OF WORK PACKAGE

0090-2
 TM 9-2320-341-10 0091

OPERATOR MAINTENANCE
OPERATE VEHICLE IN SAND OR MUD

INITIAL SETUP:

Not Applicable

OPERATE VEHICLE IN SAND OR MUD

CAUTION
Blowing sand may scratch glass surfaces. Glass surfaces should remain
covered as much as possible in these conditions to prevent scratching.

NOTE
Operating in mud can worsen vehicle braking and speed up brake wear.
If braking worsens while operating in mud, dry brakes by driving vehicle
approximately 500 ft. (153 m) with service brakes frequently applied. This
must be done with brake drums totally out of mud, so that drying action
can take place. If adequate braking is not restored by drying brakes, notify
field level maintenance.
1. Leave glass surfaces covered if not needed for operations. Extra care should be taken
when cleaning glass surfaces to prevent scratching surfaces.

NOTE
Principles of driving in sand can also be applied to driving in mud.
Best time to drive on sand is at night or early morning when sand is
damp. Damp sand gives better traction.
a. Check air filter restriction indicator (1) often.
2. Adjust tires to correct tire pressure for type tire and environment. (WP 0006)
3. Set TRANSFER CASE shift lever (2) to LO. 8X8 drive indicator (3) will illuminate.

0091-1
 TM 9-2320-341-10 0091

1
4

INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
CT EXHAUST
ER
SELE

PULL TO
AIL PLY
TR SUPAPRKING

UPPLY
AIR
R ND
T FO LA
NO MID

OS
PU
SH T

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE
2
M
M
1
2

ASS

HIGH
IDLE

soissnion
ATrallinsm

8 7

4
5
3

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 1.

0091-2
 TM 9-2320-341-10 0091

CAUTION
Wheel hop condition should be avoided to prevent possible damage to
drivetrain. If wheel hop begins to occur, ease up on throttle to allow tires
to grip surface. If wheel hop continues, release throttle and apply brakes.
Apply throttle slowly as traction permits.
4. Start slowly. Do not spin wheels when starting to move vehicle.
5. Set traction control switch (4) to INTER AXLE for added traction. Indicator light (5) will
illuminate.
6. Set transmission range selector (6) to 2 (2nd) or 1 (1st), as needed for added traction.
7. Do not straddle sand mounds or drive on sides of two sand mounds. Loose sand will
not support vehicle on steep slopes.
8. Keep throttle pedal (7) steady after vehicle reaches desired speed.
9. Turn vehicle slowly when on loose sand or mud.
10. Steer vehicle straight up and down hills if possible.
11. To move vehicle forward and turn after vehicle is stopped in loose sand or mud, do the
following:
a. Set transmission range selector (6) to R (reverse).
b. Press throttle pedal (7) and move vehicle straight back about 20 ft. (6.1 m).
c. Release throttle pedal (7) and press service brake pedal (8).
d. Set transmission range selector (6) to 1 (1st).
e. Release service brake pedal (8) and press throttle pedal (7) to move vehicle
forward.
f. Turn vehicle gradually.
g. Set transmission range selector (6) to D (drive) when vehicle picks up speed and
is moving forward smoothly.
12. If vehicle starts to skid, do the following:
a. Release throttle pedal (7).
b. Steer in direction of skid until vehicle stops skidding.
c. Press throttle pedal (7) slowly and steer vehicle on straight course.

FIFTH WHEEL ASSEMBLY CONSIDERATIONS IN SANDY CONDITIONS

NOTE
Clean and re-lubricate fifth wheel parts more often when vehicle is oper-
ated in sandy or dusty conditions. Lubricate daily under severe operating

0091-3
 TM 9-2320-341-10 0091

conditions (refer to PMCS - weekly procedures (WP 0131) for more in-
formation).
1. Continuously clean sand deposits from fifth wheel components.

PARK VEHICLE

1. Park vehicle as follows:

a. Vehicle should not face into wind.
b. Clean mud off vehicle as soon as possible.

CAUTION
• Do not hit axle breathers when cleaning mud from axles.
• Do not direct high pressure water stream at glass surfaces, seals, air
intake, axle breathers, exhaust outlet, or any other component of
vehicle that could be easily damaged by high pressure water stream.
2. Clean mud from wheels, brakes, axles, universal joints, steering mechanism, and
radiator as soon as possible.
3. Make sure axle breather vent caps move freely on breather body.

END OF TASK

END OF WORK PACKAGE

0091-4
 TM 9-2320-341-10 0092

OPERATOR MAINTENANCE
OPERATE VEHICLE IN DESERT ENVIRONMENT

INITIAL SETUP:

Not Applicable

DESERT ENVIRONMENT OPERATION

NOTE
FM 90-3 contains detailed instructions for living and working in desert.
1. Principles for operating in extreme heat (WP 0089) and extreme dust (WP 0090), sand,
or mud (WP 0091) apply to desert environment.

NOTE
• Close heater valves to improve the efficiency of cabin air
conditioning.
• Closing the heater valves disables cabin heat.
2. Temperatures may change as much as 70°F (21°C) degrees between day and night.
These changes may damage equipment if vehicle is not properly prepared.
a. Due to expansion and contraction of all fluids and air, care should be taken when
filling fuel tank and fluid reservoirs to prevent overflow when temperatures change.
b. Precision instruments may be affected by temperature changes and may need
adjustment more often.

END OF TASK

END OF WORK PACKAGE

0092-1
 TM 9-2320-341-10 0093

OPERATOR MAINTENANCE
OPERATE VEHICLE IN COLD ENVIRONMENT (32°F [0°C] TO -25°F [-32°C])

INITIAL SETUP:

Not Applicable

OPERATE VEHICLE IN COLD ENVIRONMENT

WARNING

Do not touch extremely cold metal (below -26°F, -32°C to -65°F, -54°C).
Bare skin may freeze to cold metal. Failure to comply may result in injury
or death to personnel.

CAUTION
• Before operating vehicle in extreme cold environment, ensure engine
arctic kit is installed and vehicle has been prepared as described in
FM 9-207 . Refer to FM 31-70 , FM 31-71 , and FM 21-305 for
additional information on operations in extreme cold environment.
• Watch instrument panel closely. If any unusual readings occur, stop
vehicle and shut off engine. Check engine immediately.
• Park in shelter when possible. If shelter is not available, park so
vehicle does not face into wind. Place planks or brush under wheels
so vehicle will not freeze in place.
• Fuel filter should be drained before topping off fuel tank. Keep fuel
tank as full as possible during cold operations. Water forms in empty
fuel tank as it cools. Water in fuel system could freeze and block
system.
• All snow and ice should be removed from vehicle as soon as possible.
Snow and ice may slow or stop movement of critical parts if allowed
to pile up.
• Special care must be used during operations in extreme cold
environment. In extreme cold, engine coolant and fluid in windshield

0093-1
 TM 9-2320-341-10 0093

washer can freeze. Batteries can freeze and crack. Oil and grease
may get thick and stiff. Rubber and metal parts may crack or become
brittle and break easily.
• Proper component lubrication is a must for extreme cold operation.
1. Install tire chains (WP 0079) (as needed).
2. Start engine (WP 0044) and allow engine warm up thoroughly.

NOTE
Positioning TRANSFER CASE shift lever to LO automatically activates
8X8 drive.
3. Set TRANSFER CASE shift lever (1) to LO. 8X8 DRIVE indicator (2) will illuminate.

5 2 4

INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT
PULL TO

ER
LY
TRAILSUPPKING
AIR PAR
FOR AND
SUPPLY

NOT MIDL
PU S H T O

CHEM
ALARM

GPPU

AUX
HYD HYD

1
ENABLE

M
M
12

ASS

HIGH
IDLE

AlTranlissmisonsion

7
6

Figure 1.

4. Set transmission range selector (3) to 1 (1st gear range) and drive at lowest possible
speed to warm driveline components and tires.
5. Drive on mud, snow, ice, and slippery surfaces as follows:

NOTE
• Traction control switch should be set to 8X8 when transfer case
shift lever is set to HI range while driving on slippery surfaces.

0093-2
 TM 9-2320-341-10 0093

• Positioning TRANSFER CASE shift lever to LO automatically

activates 8X8 drive.
a. Set TRANSFER CASE shift lever (1) to LO for added traction. 8X8 DRIVE indicator
(2) will illuminate.

NOTE
Traction control switch should be set to INTER AXLE when transfer
case shift lever is set to LO range while driving on slippery surfaces.
b. Set traction control switch (4) in INTER AXLE (when LO range is used -
recommended) or 8X8 (if HI range is required), as needed, when driving on slippery
surfaces. INTER-AXLE LOCK indicator (5) and/or 8X8 DRIVE indicator (2) will
illuminate as applicable.
c. Press throttle pedal (6) slowly when changing speed.
d. Keep throttle pedal (6) steady after vehicle reaches desired speed.
e. Turn vehicle slowly when on slippery surfaces.
f. Steer vehicle away from ruts and large snowbanks.
g. Steer vehicle straight up and down hills if possible.
h. Use gear range 2 (2nd) or 3 (3rd) to go down medium grades.
i. Use gear range 1 (1st) to go down steep or very slippery grades.
j. Drive at slower speeds and stay twice normal distance from vehicle ahead.
k. Signal turns sooner than normal to give vehicles behind ample time to safely slow
down.

WARNING

Do not use engine brake when vehicle is on slippery surface. If engine

brake is used incorrectly, vehicle may skid out of control. Failure to
comply may result in injury or death to personnel.

NOTE
Pressing service brake pedal lightly will help keep vehicle from skid-
ding.
l. Apply brakes sooner, and press service brake pedal (7) lightly to give early warning
that vehicle will slow or stop.

0093-3
 TM 9-2320-341-10 0093

m. Downshift, if necessary, when slowing or stopping vehicle on slick surfaces.

n. Keep windshield, windows, mirrors, headlights, stoplights, and body lights clean
and free of snow and ice. Use defroster and windshield wipers to keep windshield
free of snow and ice.
o. Drive slowly and test brakes after driving through slush or water. If brakes slip, do
the following:
(1) Continue to drive slowly.
(2) Apply moderate pressure on service brake pedal (7) to cause slight brake drag.
(3) When brakes are dry and no longer slip, release service brake pedal (7).
(4) Resume normal driving speed for conditions.
p. If absolutely necessary for better traction, lower vehicle tire pressure to emergency
air pressure limit:
(1) Ensure each tire has a valve cap.
(2) Drive at low speed when tire pressures are reduced.
q. If rear of vehicle skids, do the following:
(1) Ease up on throttle pedal (6).
(2) Steer in same direction that vehicle is skidding.
(3) When vehicle is under control, lightly apply service brake pedal (7).
(4) Steer vehicle on a straight course and slowly apply throttle pedal (6).
r. If vehicle starts to slide while climbing a grade, do the following:
(1) Ease up on throttle pedal (6).
(2) Steer in same direction that vehicle is skidding.
(3) Slowly apply throttle pedal (6) and steer vehicle on a straight course.
s. If vehicle becomes stuck, do the following:
(1) Shovel a clear path ahead of each tire.
(2) Put boards, brush, or similar material in cleared paths to get better traction.
(3) If vehicle remains stuck, use another vehicle to winch or tow stuck vehicle clear.
(4) If another vehicle is not available, self-recover vehicle using self-recovery
winch. (WP 0084)
6. Park vehicle (WP 0056) as follows:

0093-4
 TM 9-2320-341-10 0093

NOTE
If no shelter is available, park vehicle so it does not face into the wind.
Vehicle facing opposite of the direction of the wind is optimal.
a. Park vehicle in sheltered area, out of wind if possible.

NOTE
If no high, dry ground is available, spread out planks, brush, etc., to
create a raised area so that vehicle tires will not freeze in snow, water,
ice, or mud.
b. Park vehicle on high, dry ground if possible.
c. Park vehicle on level ground so vehicle body does not twist.
d. Leave transfer case shift lever (1) in LO.

NOTE
Do not hit axle breathers when cleaning mud, snow, and ice from axles.
7. Clean snow, ice, and mud off vehicle as soon as possible.
8. Clean mud, snow, and ice from wheels, brakes, axles, universal joints, mirrors, steering
mechanism, and radiator as soon as possible.
9. Ensure axle breather vent caps move freely on breather body.

END OF TASK

END OF WORK PACKAGE

0093-5
 TM 9-2320-341-10 0094

OPERATOR MAINTENANCE
OPERATION IN EXTREME COLD ENVIRONMENT

INITIAL SETUP:

Not Applicable

OPERATE VEHICLE IN EXTREME COLD ENVIRONMENT (-26°F[-32°C] to -65°F[-54°

C])

WARNING

Do not touch extremely cold metal (below -26°F, -32°C to -65°F, -54°C).
Bare skin may freeze to cold metal. Failure to comply may result in injury
or death to personnel.

CAUTION
• Before operating vehicle in extreme cold environment, ensure engine
arctic kit is installed and vehicle has been prepared as described in
FM 9-207.
• Refer to FM 31-70 , FM 31-71 , and FM 21-305 for additional
information on operations in extreme cold environment.
• Watch instrument panel closely. If any unusual readings occur, stop
vehicle and shut off engine. Check immediately.
• Park in shelter when possible. If shelter is not available, park so
vehicle does not face into wind. Place planks or brush under wheels
so vehicle will not freeze in place.
• Fuel filter should be drained before topping off fuel tank. Keep fuel
tank as full as possible during cold operations. Water forms in empty
fuel tank as it cools. Water in fuel system could freeze and block
system.
• All snow and ice should be removed from vehicle as soon as possible.
Snow and ice may slow or stop movement of critical parts if allowed
to pile up.

0094-1
 TM 9-2320-341-10 0094

• Special care must be used during operations in extreme cold

environment. In extreme cold, engine coolant and fluid in windshield
washer can freeze. Batteries can freeze and crack. Oil and grease
may get thick and stiff. Rubber and metal parts may crack or become
brittle and break easily.
• Proper component lubrication is a must for extreme cold operation.
1. Principles and procedures for operating in cold environment (WP 0093) also apply to
extreme cold environment.
2. Ensure arctic engine heater kit has been installed.
3. Operate arctic engine heater as needed.

WARNING

Do not touch extremely cold metal (below -26°F, -32°C to -65°F, -54°C).
Bare skin may freeze to cold metal. Failure to comply may result in injury
or death to personnel.

NOTE
If additional air is put in tires for standby periods, lower tire pressure to
normal amounts before driving vehicle.
4. In areas where temperatures reach -50°F (-46°C) or colder, fill tires with air
approximately 10 psi above normal for long standby periods and overnight.

END OF TASK

END OF WORK PACKAGE

0094-2
 TM 9-2320-341-10 0095

OPERATOR MAINTENANCE
OPERATE VEHICLE IN FOREST OR ROCKY TERRAIN

INITIAL SETUP:

Not Applicable

OPERATE VEHICLE IN FOREST OR ROCKY TERRAIN

WARNING

Ensure tire pressure is correct for vehicle operation. Failure to comply

may result in injury or death to personnel.

NOTE
When driving over very rocky terrain is part of the mission route, be sure
spare wheel and tire are on vehicle, in good repair, and at correct pres-
sure for normal operations. There is greater chance of tire punctures
when operating in rocky terrain.
1. Fold vehicle side mirrors in far enough so area to rear of vehicle can still be seen, but
mirrors will not be damaged by rocks, trees, and other obstructions.

CAUTION
Before driving over ground obstructions such as stumps and large rocks,
ensure vehicle has adequate clearance. Stumps and rocks may damage
components underneath vehicle.
2. Avoid driving over obstructions if possible.

CAUTION
Ensure vehicle can clear overhanging tree limbs and other obstructions.
Low overhead obstructions may damage cargo, cargo cover, and other
parts on top of vehicle.
3. Avoid low overhanging obstructions if possible.

0095-1
 TM 9-2320-341-10 0095

4. Check traction and braking. Rocks and fallen leaves can be very slick, especially when
wet.

END OF TASK

END OF WORK PACKAGE

0095-2
 TM 9-2320-341-10 0096

OPERATOR MAINTENANCE
OPERATE VEHICLE IN SALTWATER AREAS

INITIAL SETUP:

Not Applicable

OPERATION

1. Inspect vehicle and major components (crane, tanker module, LHS, etc.) frequently for
the buildup of salt deposits, rust, and corrosion.

NOTE
Do not direct high-pressure water hose nozzles, or steam cleaner nozzles
into hydraulic system seals and/or electrical junction boxes.
2. If salt deposits are located, clean the affected areas using authorized local procedures.
3. Frequently wash the vehicle and major components to prevent the buildup of salt
deposits.
4. If corrosion is present, notify your supervisor as these conditions need to be corrected
immediately.

END OF TASK

END OF WORK PACKAGE

0096-1
////////////////////////////////////////////////////////////////////////////////////

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TM 9-2320-341-10 0097

OPERATOR MAINTENANCE
SET UP/SECURE HIGHWAY EMERGENCY MARKER KIT

INITIAL SETUP:

Not Applicable

PREPARE VEHICLE/MARKERS FOR USE

1. Turn vehicle emergency flashers on. (WP 0071)

2. Remove emergency marker kit (1) from stowage brackets (2).

1
2

Figure 1.

3. Remove markers (3) from case.

0097-1

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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

TM 9-2320-341-10 0097

Figure 2.

4. Raise arms (4).

Figure 3.

5. Snap pin (5) into slot (6).

Figure 4.

6. Rotate marker (3) about ¼ turn on base (7) until it stops.

0097-2

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////////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
TM 9-2320-341-10 0097

Figure 5.

PLACE MARKERS ON UNDIVIDED HIGHWAY

1. Place one marker (1) about 40 paces (100 ft. [30 m]) in front of vehicle, so marker faces
traffic approaching from front.

Figure 6.

2. Place another marker (1) directly behind vehicle, so marker faces traffic approaching
from rear.
3. Place third marker (1) approximately about 40 paces (100 ft. [30 m]) behind vehicle, so
marker faces traffic approaching from rear.

PLACE MARKERS ON DIVIDED HIGHWAY

1. Place one marker (1) directly behind vehicle, so marker faces traffic approaching from
rear.

0097-3

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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

TM 9-2320-341-10 0097

Figure 7.

2. Place second marker (1) about 40 paces (100 ft. [30 m]) behind vehicle, so marker faces
traffic approaching from rear.
3. Place third marker (1) about 80 paces (200 ft. [60 m]) behind second marker, so marker
faces traffic approaching from rear.

SECURE MARKERS

1. Rotate marker (1) over base (2).

Figure 8.

2. Separate arms (3).

0097-4

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////////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
TM 9-2320-341-10 0097

Figure 9.

3. Fold arms (3) down onto base (2).

Figure 10.

4. Put markers (1) in case.

5. Put emergency marker kit (4) in stowage brackets (5).

0097-5

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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

TM 9-2320-341-10 0097

4
5

Figure 11.
6. Turn vehicle emergency flashers off. (WP 0071)

END OF TASK

END OF WORK PACKAGE

0097-6

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TM 9-2320-341-10 0098

OPERATOR MAINTENANCE
MANUALLY RELEASE SPRING BRAKES

INITIAL SETUP:

Not Applicable

CHOCK REAR WHEELS

NOTE
This procedure should only be used when vehicle air system is totally
inoperative and vehicle cannot be towed with rear end raised by wrecker.
1. Remove wheel chocks (1) from stowage.

3 2
1

Figure 1.

2. Place wheel chocks (1) in front and back of one wheel on No. 3 (2) or No. 4 (3) axle.

0098-1

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TM 9-2320-341-10 0098

RELEASE BRAKES

WARNING

Ensure brake chamber is caged while releasing brakes. Spring is under

2,500 lbs (1,136 kg) tension. Failure to comply may result in injury or
death to personnel.

NOTE
Driver side brake chamber on No. 4 axle is shown. Steps are same for
No. 4 axle passenger side and No. 3 axle.
1. Remove dust cap (1) from brake chamber (2).

Figure 2.

2. Remove nut (3), washer (4), and release-bolt (5) from bracket (6).

0098-2

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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
TM 9-2320-341-10 0098

Figure 3.

3. Insert release-bolt (5) into brake chamber (2).

0098-3

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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

TM 9-2320-341-10 0098

Figure 4.

4. Turn release-bolt (5) 1/4 turn to engage inside brake chamber (2).
5. Install washer (4) and nut (3) on release-bolt (5).
6. Tighten nut (3) until clevis (7) is pulled to rear of brake chamber (2).

Figure 5.
7. Repeat Steps (1) through (6) to release three remaining spring brakes on No. 3 and
No. 4 axles.

END OF TASK

END OF WORK PACKAGE

0098-4

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TM 9-2320-341-10 0099

OPERATOR MAINTENANCE
SLAVE START VEHICLE

INITIAL SETUP:

Not Applicable

PREPARE ASSIST VEHICLE

NOTE
This procedure is a two soldier task.
1. Start engine of assist vehicle. (WP 0044)

NOTE
• Model of truck can be determined by information plate on inside of
driver side cabin door.
• Base Model HEMTT - Slave receptacle may be located either on
battery box or driver side front fender.
• A2 Model HEMTT - Slave receptacle is located on driver side front
fender.
• A4 Model HEMTT - Slave receptacle is located on driver side front
fender.
2. Move assist vehicle into position beside disabled vehicle so slave receptacles (1) on
both vehicles are side by side.

0099-1

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////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

TM 9-2320-341-10 0099

BASE HEMTT

Figure 1.

A2 HEMTT

Figure 2.

0099-2

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TM 9-2320-341-10 0099

A4 HEMTT

Figure 3.
3. Shut off engine of assist vehicle. (WP 0057)

SLAVE START DISABLED VEHICLE

NOTE
• Model of truck can be determined by information plate on inside of
driver side cabin door.
• Base Model HEMTT - Slave receptacle may be located either on
battery box or driver side front fender.
• A2 Model HEMTT - Slave receptacle is located on driver side front
fender.
• A4 Model HEMTT - Slave receptacle is located on driver side front
fender.
1. Remove caps (2) from slave receptacles (1) on both vehicles.

0099-3

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TM 9-2320-341-10 0099

1
2
BASE HEMTT

Figure 4.

0099-4

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TM 9-2320-341-10 0099

A2 HEMTT

Figure 5.

A4 HEMTT

Figure 6.

0099-5

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TM 9-2320-341-10 0099

WARNING

Hot transmission/oil can cause severe burns. Wear gloves and proper
eye protection while performing troubleshooting or maintenance. Failure
to comply may result in injury or death to personnel.

NOTE
Make sure connectors and receptacles are free from dirt, sand, and deb-
ris before use.
2. Remove NATO slave cable from stowage and plug into slave receptacles of both
vehicles.
3. Start engine of assist vehicle. (WP 0044)
4. Using the throttle pedal, increase assist vehicle engine speed to more than 1000 rpm,
while assistant starts engine of disabled vehicle. (WP 0044)
5. As soon as disabled vehicle engine is running smoothly, remove NATO slave cable
from slave receptacles (1) on both vehicles and return to stowage.
6. Install caps (2) on slave receptacles (1) of both vehicles.
7. Move assist vehicle. (WP 0050)
8. Shut off engine of assist vehicle. (WP 0057)

NOTE
• Model of truck can be determined by information plate on inside of
driver side cabin door.
• A4 Model HEMTT does not have an AMPERES gauge. Battery volt-
age readout is located in top right corner of Liquid Crystal Display
(LCD) on instrument panel.
• Gauges are located in different places dependant on model HEMTT.
Select correct view below for model HEMTT being serviced.
9. Check BATTERY gauge (3) of disabled vehicle. If BATTERY gauge (3) shows less than
24 volts, notify field level maintenance. If BATTERY gauge (3) shows 24 volts or more,
continue with Step (11).

0099-6

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TM 9-2320-341-10 0099

PARKING
BRAKE

EXEXEX
3
EXEX EXEX
TRAILER
AIR SUPPLY

EXEXEX

ENGINE
OFF
ON

START

AIR BRAKE
4

BASE HEMTT

Figure 7.

PARKING
BRAKE

TRAILER
EXEX
EXEXEX
EXEX 4
AIR SUPPLY

EXEXEX

ENGINE
OFF
ON

START

AIR BRAKE
3

A2 HEMTT

Figure 8.

0099-7

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TM 9-2320-341-10 0099

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

A4 HEMTT

Figure 9.
10. Check AMPERES gauge (4) of disabled vehicle (as applicable). If AMPERES gauge
shows discharge condition, notify field level maintenance. If AMPERES gauge (4)
shows charging, continue operation of vehicle.

END OF TASK

END OF WORK PACKAGE

0099-8

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TM 9-2320-341-10 0100

OPERATOR MAINTENANCE
PERFORM IMMEDIATE ACTION FOR LOSS OF HYDRAULIC SYSTEM

INITIAL SETUP:

Not Applicable

NOTE
Steering wheel will be harder to turn after failure of hydraulic system.
1. If failure occurs while driving, continue steering as before.

NOTE
Failure of hydraulic system will stop operation of any crane, winch, or
hydraulic motor on vehicle. All cranes and winches are equipped with
automatic locking mechanisms to hold cranes and winches in position
they were in before hydraulics failed.
2. Do not try to continue operation of any crane or winch.
3. Do not try to repair hydraulic system. Notify your supervisor.
4. Notify field level maintenance.

END OF TASK

END OF WORK PACKAGE

0100-1

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TM 9-2320-341-10 0100

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0100-2

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TM 9-2320-341-10 0101

OPERATOR MAINTENANCE
LIMP HOME/TRANSMISSION FAULT

INITIAL SETUP:

Not Applicable

TRANSMISSION WILL NOT SHIFT INTO OR OUT OF GEAR (CHECK TRANSMISSION

INDICATOR ILLUMINATED)

CAUTION
If transmission range selector flashes current range selection while op-
erating vehicle (shift selection is inhibited), DO NOT SHUT OFF EN-
GINE or attempt to change range selection. Shutting off engine may result
in the inability of selecting a drive range at startup, and diagnostic data
may be lost. Move vehicle to safe place and notify field level maintenance
as soon as possible.

NOTE
When transmission oil is below 19°F (-7°C), the only gears available are
R (reverse), N (Neutral), and 3 (third gear range) when D (drive) is se-
lected. The remaining gears in D (drive) will not be available until trans-
mission oil in sump warms above 19°F (-7°C).
1. If check transmission indicator (1) illuminates when operating vehicle, apply service
brake pedal (2) and stop vehicle.

0101-1

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TM 9-2320-341-10 0101

1 5

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

4 B.O.
LIGHTS
EXHAUST
LER LY

PULL TO
TRAI SUPPKING
AIR BRAKE AIR PAR D
FOR
NOT MIDLAN

Y
S U P PL
PUSH T O

AlTranlissmisonsion

OFF

AN
.
H.A
SW E
AN
CR
3
N
NS
MA
TRA

D
LOA

D
LOA

SYST NDLI LIFT

UN

HA TI
EM NG
LOAD MU
L
Figure 1.

NOTE
DO NOT shift transmission to N (neutral).
2. Set transmission range selector (3) to R (reverse):
a. If vehicle DOES shift into R (reverse):
(1) Set transmission range selector (3) to appropriate position.
(2) Continue with mission, and notify field level maintenance when mission is
completed.
b. If vehicle DOES NOT shift into R (reverse):

NOTE
The operator must be aware that once the engine is turned off,
the vehicle will not be operable until the problem is corrected.
(1) The transmission may be locked into specific gear, and may not come out of
that gear until the engine is turned off.

0101-2

//////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
TM 9-2320-341-10 0101

WARNING

When operating the vehicle in the transmission limp home mode,

the operator must not rely on the parking brake to hold the vehicle
in place. The service brakes must also be applied. Failure to com-
ply may result in injury or death to personnel.

NOTE
The operator should consider the following guidelines carefully
with regard to type of mission, environment, terrain, etc., when de-
ciding on whether to continue the mission, deadline, or return
vehicle to field level maintenance.
(2) No additional damage to the transmission will occur. The operator can continue
to operate vehicle in the limp home mode and complete mission. However, the
operator must be aware of the following guidelines:
(a) DO NOT shut off engine until the decision is made to deadline vehicle.
Once the engine is shut off, the vehicle will not be operable until the problem
is corrected.
(b) As the engine cannot be turned off and the transmission is locked into gear,
the operator will not be able to leave the cab until vehicle is deadlined.
(c) The vehicle will not be able to operate in R (reverse).
(d) Depending on gear range the transmission is locked into, the operator may
not be able to drive vehicle up steep grades. (WP 0054)
(e) The service brake pedal (2) may need to be applied slightly earlier than
normal when stopping the vehicle.
(f) Depending upon gear range the transmission is locked into and the terrain
the vehicle is operating in, the engine and/or transmission may overheat.
The operator must closely monitor the engine coolant temperature gauge
(4) and the transmission oil temperature gauge (5).

CAUTION
If overheating occurs when operating in the transmission limp
home mode, the operator should stop the vehicle (do not shut
off engine), and allow the transmission and engine to cool down
to normal operating levels. If the engine and transmission do
not cool down, or overheating reoccurs, the operator should

0101-3

//////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

TM 9-2320-341-10 0101

shut off engine and notify field level maintenance. Failure to

comply may result in damage to equipment.
(g) Notify field level maintenance as soon as possible.

END OF TASK

END OF WORK PACKAGE

0101-4

//////////////////////////////////////////////////////////////////////////////////
 TM 9-2320-341-10 0102

OPERATOR MAINTENANCE
STOWAGE AND SIGN GUIDE

SCOPE

This work package shows locations for data plates, decals, and stencils that are required
to be in place on the HEMTT series vehicles.

GENERAL

The following figures show the location of metal signs, decals, and stencils used on the
vehicle. Most of these signs and stencils contain cautions or information needed to operate
the vehicle safely. For stowage locations of Components Of End Item (COEI) and Basic
Issue Items (BII), refer to Components of End Item and Basic Issue Items tables. (WP
0147)

Table 1. Inside Driver Side Door.

1
10

2
CARC
9
3
8
4
7
5 6

INDEX DECAL/PLATE/STENCIL

0102-1
 TM 9-2320-341-10 0102

Table 1. Inside Driver Side Door. - Continued

1 Manufacturer's Certification Information

2 Parts Data

3 “CARC” Stencil

4 Overhaul Data (included on all vehicles)

5 Noise Exemption Decal

6 Rustproofing CAUTION

7 Rustproofing Data

8 Warranty Information

9 Tire Inflation Data

10 Shipping Data

Table 2. Front Exterior.

3
2

INDEX PLACARD/STENCIL

0102-2
 TM 9-2320-341-10 0102

Table 2. Front Exterior. - Continued

1 ”TIEDOWN” Stencil

2 Sign Kit/Weight Indicator

3 US Army Star Stencil

Table 3. M983A4 LET Tractor Cabin.

INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT

PULL TO
ER
LY
TRAILSUPPKING
AIR PAR
FOR AND

SUPPLY
NOT MIDL
PU S H T O

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
12

ASS

HIGH
IDLE

AlTranlissmisonsion
1

INDEX DECAL/PLATE

1 Transfer Case Data Plate

2 Traction Control Data Decal

0102-3
 TM 9-2320-341-10 0102

Table 4. M983A4 LET Tractor Driver Side Exterior.

7
6
4
5

1 3

3
2

INDEX DECAL/PLACARD/STENCIL

1 Vehicle Identification Number (VIN) Placard

2 CAUTION Decal (hearing protection required)

3 ”TIEDOWN” Stencil

4 Heavy-Duty Winch Controls Placard

5 ”24V” Stencil

6 ”FULL COLD” Stencil

7 ”NO STEP” Stencil

(multiple on exhaust and engine access panels)

0102-4
 TM 9-2320-341-10 0102

Table 5. M983A4 LET Tractor Passenger Side Exterior.

4 5
3
7
2
1

INDEX DECAL/PLACARD/PLATE/STENCIL

1 Heavy-Duty Winch Data Plate

2 WARNING and Instructions for Tire Carrier Pump

(2 placards total)

3 CAUTION (hydraulic selector valve) Decal

4 SUSPENSION DUMP VALVE Placard

5 ”NO STEP” Stencil

(multiple on exhaust and engine access panels)

6 ”TIEDOWN” Stencil

7 CAUTION Decal (hearing protection required)

0102-5
 TM 9-2320-341-10 0102

Table 6. M983A4 LET Tractor Rear Exterior.

INDEX STENCIL

1 ”SLING POINT” and “TIEDOWN” Stencils

(one each per side)

2 US Army Star Stencil

Table 7. M983A4 LET Miscellaneous Decals/Placards/Plates/Stencils.

LOCATION QUANTITY

Axle Housing 4

Carrier 4

Transfer Case 1

Engine 1

Transmission 1

0102-6
 TM 9-2320-341-10 0102

Table 7. M983A4 LET Miscellaneous Decals/Placards/Plates/Stencils. - Continued

Total 11

END OF WORK PACKAGE

0102-7
 TM 9-2320-341-10

CHAPTER 3

TROUBLESHOOTING
PROCEDURES
TM 9-2320-341-10
 TM 9-2320-341-10 0103

OPERATOR MAINTENANCE
BUZZER SOUNDS AND AIR INDICATOR IS LIT

INITIAL SETUP:

Equipment Condition Parking brakes applied. (WP 0056)

Engine OFF. (WP 0057) Wheels chocked. (WP 0072)

TROUBLESHOOTING PROCEDURE
BUZZER SOUNDS AND AIR INDICATOR IS LIT

TEST 1 - Is air pressure greater than 75 psi (517 kPa)?

1. Start engine, (WP 0044)and allow air pressure to build.
2. Check air pressure.

0103-1
 TM 9-2320-341-10 0103

INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT

PULL TO
ER LY
TRAILSUPPKING
AIR PAR
FOR AND

UPPLY
NOT MIDL

OS
PUSH T

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
12

ASS

HIGH
IDLE

AlTranlissmisonsion

REAR AIR
FRONT AIR PRESSURE GAUGE
PRESSURE GAUGE

AIR
INDICATOR LIGHT

Figure 1.
3. Turn engine OFF. (WP 0057)

CONDITION/INDICATION
Is air pressure greater than 75 psi (517 kPa)?

DECISION
No - Test 2 - Are any petcock valves open?
Yes - Notify Supervisor.

TEST 2 - Are any petcock valves open?

1. Check if any air reservoir petcock/drain valves are open. If valve(s) open, close petcock
(s).

0103-2
 TM 9-2320-341-10 0103

AIR RESERVOIR NO. 1

DRAIN VALVE

AIR RESERVOIR NO. 5

AIR RESERVOIR DRAIN VALVE
DRAIN MANIFOLD
AIR RESERVOIR NO. 4
AIR RESERVOIR NO. 3 DRAIN VALVE
DRAIN VALVE
AIR RESERVOIR NO. 2
DRAIN VALVE

Figure 2.

CONDITION/INDICATION
Are any petcock valves open?

DECISION
Petcock(s) open - Test 6 - Does buzzer stop, and air indicator light extinguish?
Petcock's closed - Test 3 - Is trailer air supply control in correct position?

TEST 3 - Is trailer air supply control in correct position?

1. Check that trailer air supply control is pulled out (OFF position) if no trailer is coupled,
and pushed in (ON position) if trailer is coupled.
2. If trailer air control is found in an incorrect position, set to correct position.

0103-3
 TM 9-2320-341-10 0103

25 6.2
22 5.5
15 3.7
11 2.7
8 2.0

IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

TRAILER
INTER-
AXLE
8X8

PARKING
B.O.
BRAKE

AIR SUPPLY
LIGHTS
B.O.
EXHAUST
SELECT

PULL TO
ER
TRAILSUPPLYING
AIR PARK
FOR AND

LY
NOT MIDL

S U PP
PU S H T O

CHEM
ALARM

AUX
HYD HYD
ENABLE
GPPU
CONTROL TRAILER
AIR SUPPLY

M
M
12

ASS

HIGH
IDLE
n
AllTransisomission

Figure 3.

CONDITION/INDICATION
Is trailer air supply control in correct position?

DECISION
No - Test 6 - Does buzzer stop, and air indicator light extinguish?
Yes - Test 4 - Does air reservoir, hoses, lines, fittings, and/or connectors leak?

TEST 4 - Does air reservoir, hoses, lines, fittings, and/or connectors leak?
1. Check air reservoir, hoses, lines, fittings, and/or connectors for leaks. Tighten any leaks
found.

0103-4
 TM 9-2320-341-10 0103

FRONT

AIR
COMPRESSOR AIR
DRYER
AIR RESERVOIR
NO. 5 AIR RESERVOIR
NO. 2
AIR RESERVOIR AIR RESERVOIR
NO. 3 NO. 1
(ALL EXCEPT M1120 A4 LHS)
AIR RESERVOIR
NO. 4
AIR RESERVOIR
NO. 3
(M1120 A4 LHS ONLY)

Figure 4.

CONDITION/INDICATION
Does air reservoir, hoses, lines, fittings, and/or connectors leak?

0103-5
 TM 9-2320-341-10 0103

DECISION
Air reservoir, hoses, lines and/or connectors leak. - Notify Supervisor. Test 6 - Does
buzzer stop, and air indicator light extinguish?Notify Supervisor.
Air reservoir, hoses, lines, fittings, and/or connectors OK - Test 5 - Does buzzer sound,
and air indicator light illuminate when trailer is disconnected?

TEST 5 - Does buzzer sound, and air indicator light illuminate when trailer is
disconnected?
1. If trailer is coupled, disconnect trailer from vehicle.

INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT

PULL TO
ER LY
TRAILSUPPKING
AIR PAR
FOR AND

UPPLY
NOT MIDL

OS
PUSH T

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
12

ASS

HIGH
IDLE

AlTranlissmisonsion

REAR AIR
FRONT AIR PRESSURE GAUGE
PRESSURE GAUGE

AIR
INDICATOR LIGHT

Figure 5.
2. Start engine, (WP 0044) and allow air pressure to build.
3. Check if buzzer continues to sound, and if air indicator light is illuminated.
4. Turn engine off. (WP 0057)

CONDITION/INDICATION
Does buzzer sound, and air indicator light illuminate when trailer is disconnected?

0103-6
 TM 9-2320-341-10 0103

DECISION
No - Notify Supervisor.
Yes - Problem corrected.

TEST 6 - Does buzzer stop, and air indicator light extinguish?

1. Start engine, (WP 0044) and allow air pressure to build.
2. Check that buzzer does not sound, and air indicator light is off.

INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT

PULL TO
ER LY
TRAILSUPPKING
AIR PAR
FOR AND

UPPLY
NOT MIDL

OS
PUSH T

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
12

ASS

HIGH
IDLE

AlTranlissmisonsion

REAR AIR
FRONT AIR PRESSURE GAUGE
PRESSURE GAUGE

AIR
INDICATOR LIGHT

Figure 6.
3. Turn engine off. (WP 0057)

CONDITION/INDICATION
Does buzzer stop, and air indicator light extinguish?

DECISION
No - Notify Supervisor.
Yes - Problem corrected.

END OF WORK PACKAGE

0103-7
 TM 9-2320-341-10 0104

OPERATOR MAINTENANCE
AIR SYSTEM LOSES PRESSURE DURING OPERATION

INITIAL SETUP:

Equipment Condition Parking brakes applied. (WP 0056)

Engine OFF. (WP 0057) Wheels chocked. (WP 0072)

TROUBLESHOOTING PROCEDURE
AIR SYSTEM LOSES PRESSURE DURING OPERATION

TEST 1 - Are any petcock valves open?

WARNING

Caution the hose connections could be under pressure be sure to wear

eye protection to avoid personal injury.
1. Check to make sure all five air reservoir petcock/drain valves are closed.

0104-1
 TM 9-2320-341-10 0104

AIR RESERVOIR NO. 1

DRAIN VALVE

AIR RESERVOIR NO. 5

AIR RESERVOIR DRAIN VALVE
DRAIN MANIFOLD
AIR RESERVOIR NO. 4
AIR RESERVOIR NO. 3 DRAIN VALVE
DRAIN VALVE
AIR RESERVOIR NO. 2
DRAIN VALVE

Figure 1.

CONDITION/INDICATION
Are any petcock valves open?

DECISION
Petcock(s) open - Test 5 - Does air system lose pressure during operation?
Petcocks closed - Test 2 - Is trailer air supply control in correct position?

TEST 2 - Is trailer air supply control in correct position?

1. Check if trailer air supply control is pulled out (OFF position) if no trailer is coupled, and
pushed in (ON position) if trailer is coupled.
2. If trailer air supply control is found in an incorrect position, set to correct position.

0104-2
 TM 9-2320-341-10 0104

Figure 2.
3. If trailer air supply control is found in an incorrect position, set to correct position.

0104-3
 TM 9-2320-341-10 0104

25 6.2
22 5.5
15 3.7
11 2.7
8 2.0

IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

TRAILER
INTER-
AXLE
8X8

PARKING
B.O.
BRAKE

AIR SUPPLY
LIGHTS
B.O.
EXHAUST
SELECT

PULL TO
ER
TRAILSUPPLYING
AIR PARK
FOR AND

LY
NOT MIDL

S U PP
PU S H T O

CHEM
ALARM

AUX
HYD HYD
ENABLE
GPPU
CONTROL TRAILER
AIR SUPPLY

M
M
12

ASS

HIGH
IDLE
n
AllTransisomission

Figure 3.

CONDITION/INDICATION
Is trailer air supply control in correct position?

DECISION
No - Test 5 - Does air system lose pressure during operation?
Yes - Test 3 - Does air pressure reach 120 psi (827 kPa) with engine accelerated?

TEST 3 - Does air pressure reach 120 psi (827 kPa) with engine accelerated?
1. Start engine. (WP 0044)
2. Accelerate engine and check if air pressure reaches 120 psi (827 kPa).

0104-4
 TM 9-2320-341-10 0104

INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT

PULL TO
ER LY
TRAILSUPPKING
AIR PAR
FOR AND

UPPLY
NOT MIDL

OS
PUSH T

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
12

ASS

HIGH
IDLE

AlTranlissmisonsion

REAR AIR
FRONT AIR PRESSURE GAUGE
PRESSURE GAUGE

AIR
INDICATOR LIGHT

Figure 4.

CONDITION/INDICATION
Does air pressure reach 120 psi (827 kPa) with engine accelerated?

DECISION
No - Notify Supervisor.
Yes - Test 4 - Are air leaks present?

TEST 4 - Are air leaks present?

1. Turn engine off. (WP 0057)
2. Press service brake treadle completely down, and have crew member check for air
leaks.

0104-5
 TM 9-2320-341-10 0104

FRONT

AIR
COMPRESSOR AIR
DRYER
AIR RESERVOIR
NO. 5 AIR RESERVOIR
NO. 2
AIR RESERVOIR AIR RESERVOIR
NO. 3 NO. 1
(ALL EXCEPT M1120 A4 LHS)
AIR RESERVOIR
NO. 4
AIR RESERVOIR
NO. 3
(M1120 A4 LHS ONLY)

Figure 5.
3. If leaky fitting(s) found, tighten fittings.

CONDITION/INDICATION
Are air leaks present?

DECISION
Air leaks found - Notify Supervisor.
No air leaks found - Test 5 - Does air system lose pressure during operation?

0104-6
 TM 9-2320-341-10 0104

TEST 5 - Does air system lose pressure during operation?

1. Start engine. (WP 0044)
2. Test drive vehicle.
3. Observe and note air pressure.

CONDITION/INDICATION
Does air system lose pressure during operation?

DECISION
No - Notify Supervisor.
Yes - Problem corrected.

END OF WORK PACKAGE

0104-7
 TM 9-2320-341-10 0105

OPERATOR MAINTENANCE
TRAILER BRAKE DOES NOT APPLY WHEN SERVICE BRAKE TREADLE OR
PARKING BRAKE IS USED

INITIAL SETUP:

Equipment Condition Parking brakes applied. (WP 0056)

Engine OFF. (WP 0057) Wheels chocked. (WP 0072)

TROUBLESHOOTING PROCEDURE
TRAILER BRAKE DOES NOT APPLY WHEN SERVICE BRAKE TREADLE OR
PARKING BRAKE IS USED

TEST 1 - Are intervehicular air hoses securely and correctly connected?

1. Check that intervehicular air hoses are secure and correctly connected. If not, reconnect
correctly.

0105-1
 TM 9-2320-341-10 0105

Figure 1.

CONDITION/INDICATION
Are intervehicular air hoses securely and correctly connected?

DECISION
No - Test 3 - Do trailer brakes apply when service brake treadle or parking brake is
used?
Yes - Test 2 - Is trailer air supply control pushed in (ON position)?

TEST 2 - Is trailer air supply control pushed in (ON position)?

1. Check if trailer air supply control is pushed in (ON position).

0105-2
 TM 9-2320-341-10 0105

25 6.2
22 5.5
15 3.7
11 2.7
8 2.0

IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

TRAILER
INTER-
AXLE
8X8

PARKING
B.O.
BRAKE

AIR SUPPLY
LIGHTS
B.O.
EXHAUST
SELECT

PULL TO
ER
TRAILSUPPLYING
AIR PARK
FOR AND

LY
NOT MIDL

S U PP
PU S H T O

CHEM
ALARM

AUX
HYD HYD
ENABLE
GPPU
CONTROL TRAILER
AIR SUPPLY

M
M
12

ASS

HIGH
IDLE
n
AllTransisomission

Figure 2.
2. If trailer air supply control is found pulled out (OFF position), push in.

CONDITION/INDICATION
Is trailer air supply control pushed in (ON position)?

DECISION
No - Test 3 - Do trailer brakes apply when service brake treadle or parking brake is
used?
Yes - Notify Supervisor.

TEST 3 - Do trailer brakes apply when service brake treadle or parking brake is used?
1. Start engine. (WP 0044)
2. Test drive vehicle.
3. Note trailer brake operations.

CONDITION/INDICATION
Do trailer brakes apply when service brake treadle or parking brake is used?

DECISION
No - Notify Supervisor.
Yes - Problem corrected.

END OF WORK PACKAGE

0105-3
 TM 9-2320-341-10 0106

OPERATOR MAINTENANCE
WINDSHIELD WASHER WILL NOT OPERATE

INITIAL SETUP:

Equipment Condition Parking brakes applied. (WP 0056)

Engine OFF. (WP 0057) Wheels chocked. (WP 0072)

TROUBLESHOOTING PROCEDURE
WINDSHIELD WASHER WILL NOT OPERATE

TEST 1 - Is washer fluid reservoir free from damage or cracks?

1. Check washer fluid reservoir for cracks and/or damage.

WINDSHIELD WASHER
RESERVOIR

Figure 1.

CONDITION/INDICATION
Is washer fluid reservoir free from damage or cracks?

DECISION
No - Notify Supervisor.
Yes - Test 2 - Is washer fluid present in washer fluid reservoir?

0106-1
 TM 9-2320-341-10 0106

TEST 2 - Is washer fluid present in washer fluid reservoir?

CAUTION
Do not fill windshield washer reservoir with water when temperatures are
likely to be 32°F (0°C) or less. If water freezes, reservoir can crack or
break.
1. Check washer fluid level in reservoir. if low, fill windshield washer reservoir.

WINDSHIELD WASHER
RESERVOIR

Figure 2.

CONDITION/INDICATION
Is washer fluid present in washer fluid reservoir?

DECISION
No - Test 6 - Does the windshield washer operate?
Yes - Test 3 - Are all hoses securely attached to reservoir?

TEST 3 - Are all hoses securely attached to reservoir?

1. Check that all hoses are securely attached to reservoir. If loose hoses are found, attach
to reservoir.

0106-2
 TM 9-2320-341-10 0106

AIR HOSE FLUID SUPPLY HOSE

WINDSHIELD
WASHER NOZZLE

FLUID HOSE
WINDSHIELD WASHER
RESERVOIR

Figure 3.

CONDITION/INDICATION
Are all hoses securely attached to reservoir?

DECISION
No - Test 6 - Does the windshield washer operate?
Yes - Test 4 - Are hoses free of cracks or damage?

TEST 4 - Are hoses free of cracks or damage?

1. Check if hoses are cracked or damaged.

0106-3
 TM 9-2320-341-10 0106

AIR HOSE FLUID SUPPLY HOSE

WINDSHIELD
WASHER NOZZLE

FLUID HOSE
WINDSHIELD WASHER
RESERVOIR

Figure 4.

CONDITION/INDICATION
Are hoses free of cracks or damage?

DECISION
No - Notify Supervisor.
Yes - Test 5 - Are washer spray openings free of debris?

TEST 5 - Are washer spray openings free of debris?

1. Check washer spray openings on wipers for clogs.

WINDSHIELD
WASHER NOZZLE

FLUID HOSE

Figure 5.
2. If openings are clogged, clear washer spray opening using pin, wire, or similar item.

0106-4
 TM 9-2320-341-10 0106

CONDITION/INDICATION
Are washer spray openings free of debris?

DECISION
No - Test 6 - Does the windshield washer operate?
Yes - Notify Supervisor.

TEST 6 - Does the windshield washer operate?

1. Start engine, (WP 0044)and allow air pressure to build.
2. Check windshield washer for proper operation.

INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT

PULL TO
ER
LY
TRAILSUPPKING
AIR PAR
FOR AND

UPPLY
NOT MIDL

P U SH T

OS
CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
12

ASS

HIGH
IDLE

AlTranlissmisonsion

WINDSHIELD
WASHER SWITCH

Figure 6.

CONDITION/INDICATION
Does the windshield washer operate?

DECISION
No - Notify Supervisor.
Yes - Problem corrected.

END OF WORK PACKAGE

0106-5
 TM 9-2320-341-10 0107

OPERATOR MAINTENANCE
AIR HORN WILL NOT OPERATE

INITIAL SETUP:

Equipment Condition Parking brakes applied. (WP 0056)

Engine OFF. (WP 0057) Wheels chocked. (WP 0072)

TROUBLESHOOTING PROCEDURE
AIR HORN WILL NOT OPERATE

TEST 1 - Are air hoses tight?

WARNING

Caution the hose connections could be under pressure be sure to wear

eye protection to avoid personal injury.
1. Check air hose connections for tightness. Tighten any loose hose connections found.

0107-1
 TM 9-2320-341-10 0107

AIR HORN AIR HORN

VALVE LEVER

Figure 1.

CONDITION/INDICATION
Are air hoses tight?

DECISION
Connections loose - Test 3 - Does air horn operate?
Connections OK - Test 2 - Does horn valve lever move freely?

TEST 2 - Does horn valve lever move freely?

1. Check horn valve lever for freedom of movement.

0107-2
 TM 9-2320-341-10 0107

AIR HORN AIR HORN

VALVE LEVER

Figure 2.

CONDITION/INDICATION
Does horn valve lever move freely?

DECISION
No - Notify Supervisor.
Yes - Test 3 - Does air horn operate?

TEST 3 - Does air horn operate?

1. Start engine, (WP 0044) and allow air pressure to build.
2. Check air horn for proper operation.

0107-3
 TM 9-2320-341-10 0107

AIR HORN AIR HORN

VALVE LEVER

Figure 3.
3. Turn engine off. (WP 0057)

CONDITION/INDICATION
Does air horn operate?

DECISION
No - Notify Supervisor.
Yes - Problem corrected.

END OF WORK PACKAGE

0107-4
 TM 9-2320-341-10 0108

OPERATOR MAINTENANCE
ARCTIC ENGINE HEATER FAILS TO OPERATE

INITIAL SETUP:

Equipment Condition Parking brakes applied. (WP 0056)

Engine OFF. (WP 0057) Wheels chocked. (WP 0072)

TROUBLESHOOTING PROCEDURE
ARCTIC ENGINE HEATER FAILS TO OPERATE

TEST 1 - Is fuel present in fuel tank?

1. Turn engine start switch ON. (WP 0020)
2. Turn engine start switch OFF.
3. Add fuel to fuel tank if no fuel present.

CONDITION/INDICATION
Is fuel present in fuel tank?

DECISION
No - Test 3 - Does arctic heater operate?
Yes - Test 2 - Are arctic heater intake port and exhaust tube free from blockage?

TEST 2 - Are arctic heater intake port and exhaust tube free from blockage?
1. Inspect arctic heater inlet port and exhaust tube for foreign objects and obstructions.
Remove any items found.

0108-1
 TM 9-2320-341-10 0108

Figure 1.

CONDITION/INDICATION
Are arctic heater intake port and exhaust tube free from blockage?

0108-2
 TM 9-2320-341-10 0108

DECISION
-
Continue - Test 3 - Does arctic heater operate?

TEST 3 - Does arctic heater operate?

CAUTION
Do not attempt to operate arctic heater if arctic heater fails to start, or
shutdown occurs during normal operation. System shutdown may indi-
cate an arctic heater system fault. Failure to comply may cause system
lockout.

CAUTION
Do not operate arctic heater if arctic heater indicator light flashes during
normal operation. Arctic heater indicator light flashing indicates an arctic
heater system fault. Failure to comply may cause system lockout.

NOTE
If arctic heater does not operate, arctic heater may be in lockout mode
due to, either too many overheat occurrences (code 15), or too many start
attempts (code 50). Arctic heater lockout mode (code 50) is activated if
arctic heater fails to start after 20 successive start attempts (10 start cy-
cles in succession).

NOTE
The arctic heater will attempt to start two times per start cycle. After the
second failed start attempt, the arctic heater will not operate until the arc-
tic heater on/off switch is turned off, then back on.

NOTE
Audible clicking from the arctic heater fuel metering pump may indicate
that the arctic heater fuel system isn’t primed. If audible clicking is heard
from the arctic heater fuel metering pump, repeat steps (1) through (4)
four times, or until arctic heater starts. Do not attempt to start arctic heater
more than five times. The arctic heater should prime itself within nine start
attempts.
1. Turn arctic heater ON.
2. Observe arctic heater indicator light for steady illumination.
3. Observe arctic heater for proper operation.
4. Turn arctic heater on/off switch OFF.

0108-3
 TM 9-2320-341-10 0108

Figure 2.

CONDITION/INDICATION
Does arctic heater operate?

DECISION
No - Notify Supervisor.
Yes - Problem corrected.

END OF WORK PACKAGE

0108-4
 TM 9-2320-341-10 0109

OPERATOR MAINTENANCE
ONE OR MORE LIGHTING CIRCUITS NOT OPERATING

INITIAL SETUP:

Equipment Condition Parking brakes applied. (WP 0056)

Engine OFF. (WP 0057) Wheels chocked. (WP 0072)

TROUBLESHOOTING PROCEDURE
ONE OR MORE LIGHTING CIRCUITS NOT OPERATING

TEST 1 - Is the lighting system control in the ON or OPERATING position?

1. Check if lighting system control is ON or in OPERATING position.

0109-1
 TM 9-2320-341-10 0109

MASTER LIGHTS
SWITCH

INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT
PULL TO

ER
LY
TRAILSUPPKING
AIR PAR
FOR AND
U P P LY

NOT MIDL

P USH T
OS

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
12

ASS

HIGH
IDLE

AlTranlissmisonsion

Figure 1.

CONDITION/INDICATION
Is the lighting system control in the ON or OPERATING position?

DECISION
No - Test 3 - Do all lighting circuits operate properly?
Yes - Test 2 - Is intervehicular connection secure and/or connected correctly?

TEST 2 - Is intervehicular connection secure and/or connected correctly?

1. If trailer is attached, and trailer lighting system is not working, check intervehicular
connection.
2. If trailer lights are the problem, make sure cable is securely connected.

0109-2
 TM 9-2320-341-10 0109

Figure 2.

CONDITION/INDICATION
Is intervehicular connection secure and/or connected correctly?

0109-3
 TM 9-2320-341-10 0109

DECISION
Intervehicular cable loose. - Test 3 - Do all lighting circuits operate properly?Notify
Supervisor.
Intervehicular connection OK. - Notify Supervisor.

TEST 3 - Do all lighting circuits operate properly?

1. Check for proper operation of dome lights. (WP 0060)
2. Check for proper operation of panel lights. (WP 0061)
3. Check for proper operation of service drive lights. (WP 0063)
4. Check for proper operation of parking lights. (WP 0062)
5. Check for proper operation of clearance lights. (WP 0065)
6. Check for proper operation of stoplight. (WP 0064)
7. Check for proper operation of blackout drive lights. (WP 0066)
8. Check for proper operation of blackout marker lights. (WP 0067)
9. Check for proper operation of turn signal lights. (WP 0070)

CONDITION/INDICATION
Do all lighting circuits operate properly?

DECISION
No - Notify Supervisor.
Yes - Problem corrected.

END OF WORK PACKAGE

0109-4
 TM 9-2320-341-10 0110

OPERATOR MAINTENANCE
FAILS TO CRANK WHEN ENGINE START SWITCH IS TURNED TO START POSITION

INITIAL SETUP:

Equipment Condition Parking brakes applied. (WP 0056)

Engine OFF. (WP 0057) Wheels chocked. (WP 0072)

TROUBLESHOOTING PROCEDURE
FAILS TO CRANK WHEN ENGINE START SWITCH IS TURNED TO START POSITION

TEST 1 - Is transmission range selector in neutral (N)?

1. Verify range selector is in neutral (N) position. If not in neutral (N), shift it to neutral (N).

INTER-
AXLE

TRANSMISSION
8X8

B.O.
LIGHTS

RANGE
B.O.
EXHAUST
SELECT
LER
PULL TO

TRAISUPPKINLYG
AIR FOR
PAR D
NOT MIDLAN
S U P P LY

PUS O
HT

SELECTOR
CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
1
2

ASS

HIGH
IDLE
nn
ATranlliso
smissio

Figure 1.

CONDITION/INDICATION
Is transmission range selector in neutral (N)?

DECISION
No - Test 3 - Does engine crank when engine start switch is turned to start position?
Yes - Test 2 - Are battery cable connections clean, tight, and free from damage?

0110-1
 TM 9-2320-341-10 0110

TEST 2 - Are battery cable connections clean, tight, and free from damage?
1. Remove battery box cover. (WP 0142)
2. Check battery cable connections for dirt, corrosion and/or looseness.

Figure 2.
3. Check battery cables for damage.

CONDITION/INDICATION
Are battery cable connections clean, tight, and free from damage?

DECISION
No - Notify Supervisor.
Yes - Test 3 - Does engine crank when engine start switch is turned to start position?

TEST 3 - Does engine crank when engine start switch is turned to start position?
1. Install battery box cover. (WP 0142)
2. Attempt to start engine. (WP 0044)

0110-2
 TM 9-2320-341-10 0110

CONDITION/INDICATION
Does engine crank when engine start switch is turned to start position?

DECISION
No - Notify Supervisor.
Yes - Problem corrected.

END OF WORK PACKAGE

0110-3
 TM 9-2320-341-10 0111

OPERATOR MAINTENANCE
CRANKS BUT FAILS TO START

INITIAL SETUP:

Equipment Condition Parking brakes applied. (WP 0056)

Engine OFF. (WP 0057) Wheels chocked. (WP 0072)

TROUBLESHOOTING PROCEDURE
CRANKS BUT FAILS TO START

TEST 1 - Does fuel gauge indicate the presence of fuel?

1. Turn engine start switch ON. (WP 0020)
2. Check fuel gauge for indication of fuel presence.

FUEL
GAUGE

R-
INTE E

LOW FUEL
AXL
8X8

B.O.
TS
LIGH

INDICATOR
B.O.
ECT EXHAU
SEL R
PULL TO

LE LY G
T

AI PP IN
TR SU RK
O SUP

R PA D
AI R AN
FO
T MIDL
HT

NO PUS

M
CHERM
ALA

U
GPP

AUX
HYD HYD
BLE
ENA

M
1
M 2
ASS

HIGH
IDLE

on ion
Allis
sm
iss
Tran

Figure 1.
3. Turn engine start switch OFF. (WP 0020)

CONDITION/INDICATION
Does fuel gauge indicate the presence of fuel?

0111-1
 TM 9-2320-341-10 0111

DECISION
No - Test 4 - Does engine start?
Yes - Test 2 - Is there fuel present in fuel tank?

TEST 2 - Is there fuel present in fuel tank?

1. Remove fuel tank cap and filter screen from fuel tank.

Figure 2.
2. Check fuel tank for presence of fuel.
3. Add fuel to fuel tank if no fuel was present.
4. Replace filter screen and fuel tank cap on fuel tank.

0111-2
 TM 9-2320-341-10 0111

CONDITION/INDICATION
Is there fuel present in fuel tank?

DECISION
No - Test 4 - Does engine start?
Yes - Test 3 - Is air filter restricted?

TEST 3 - Is air filter restricted?

1. Attempt to start engine and note indication on air filter restriction indicator.

AIR FILTER
RESTRICTION
INDICATOR
R-
INTE E
AXL

8X8

B.O.
TS
LIGH
B.O.
EXH UST
A
ECT
SEL

PULL TO
R
LE LY G
AI PP IN
TR SU RK
R

SUPPLY
AI PA D
R AN
FO
T MIDL
NO PU
SH T

O
M
CHERM
ALA

U
GPP

AUX
HYD HYD
BLE
ENA

M
1
M 2

ASS

HIGH
IDLE

son
Alli ission
sm
Tran

Figure 3.

CONDITION/INDICATION
Is air filter restricted?

DECISION
Restricted - Service air filter. (WP 0140)
Not Restricted - Test 4 - Does engine start?

TEST 4 - Does engine start?

1. Attempt to start engine. (WP 0044)

CONDITION/INDICATION
Does engine start?

0111-3
 TM 9-2320-341-10 0111

DECISION
Air filter indicator shows red after cleaning filter. - Notify Supervisor. Notify Supervisor.
Engine starts. - Problem corrected.

END OF WORK PACKAGE

0111-4
 TM 9-2320-341-10 0112

OPERATOR MAINTENANCE
STARTS OR RUNS ROUGHLY AFTER PROPER WARM-UP, DOES NOT MAKE FULL
POWER, OR MAKES EXCESSIVE EXHAUST SMOKE

INITIAL SETUP:

Equipment Condition Parking brakes applied. (WP 0056)

Engine OFF. (WP 0057) Wheels chocked. (WP 0072)

TROUBLESHOOTING PROCEDURE
STARTS OR RUNS ROUGHLY AFTER PROPER WARM-UP, DOES NOT MAKE FULL
POWER, OR MAKES EXCESSIVE EXHAUST SMOKE

TEST 1 - Is PTO engaged?

1. Start engine and allow engine to reach normal operating temperature. (WP 0044)
2. Check HYD Enable switch and Main HYD Enable indicator to make sure that PTO is
disengaged. Light should be off.

0112-1
 TM 9-2320-341-10 0112

INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT

PULL TO
ER
TRAILSUPPLYING
AIRNOT FORMIDLPARKAND

LY
S U PP
PU S H T O

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
12

ASS

HIGH
IDLE

AlTranslismissonion

MAIN HYD
HYD ENABLE
ENABLE INDICATOR
SWITCH

CHEM INTER
ALARM AXLE

8X8

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

M 1
2 M

HIGH 0
1
IDLE 2

Figure 1.

CONDITION/INDICATION
Is PTO engaged?

DECISION
PTO engaged. - Test 4 - Does engine start or run roughly after proper warm-up, and/
or does not make full power or makes excessive exhaust smoke?
PTO disengaged. - Test 2 - Does air filter restriction indicator show red and/or VACUUM
INCHES H2O window show 18 or more after being reset?

TEST 2 - Does air filter restriction indicator show red and/or VACUUM INCHES H2O
window show 18 or more after being reset?
1. Reset air filter restriction indicator.
2. Start engine. (WP 0044)
3. Check if air filter restriction indicator is red and/or VACUUM INCHES/kPa H2O window
shows 18 or more.

0112-2
 TM 9-2320-341-10 0112

AIR FILTER
RESTRICTION
INDICATOR
R-
INTE E
AXL

8X8

B.O.
TS
LIGH
B.O.
EXH UST
A
ECT
SEL

PULL TO
R
LE LY G
AI PP IN
TR SU RK
R

SUPPLY
AI PA D
R AN
FO
T MIDL
NO PU
SH T

O
M
CHERM
ALA

U
GPP

AUX
HYD HYD
BLE
ENA

M
1
M 2

ASS

HIGH
IDLE

son
Alli ission
sm
Tran

Figure 2.

CONDITION/INDICATION
Does air filter restriction indicator show red and/or VACUUM INCHES H2O window
show 18 or more after being reset?

DECISION
Restricted. - Test 3 - Does air filter restriction indicator show red and/or VACUUM
INCHES H2O window show 18 or more after being cleaned?
Not restricted. - Test 4 - Does engine start or run roughly after proper warm-up, and/or
does not make full power or makes excessive exhaust smoke?

TEST 3 - Does air filter restriction indicator show red and/or VACUUM INCHES H2O
window show 18 or more after being cleaned?
1. Turn engine OFF. (WP 0057)
2. Clean air filter. (WP 0140)
3. Start engine. (WP 0044)
4. Check if air filter restriction indicator is red and/or VACUUM INCHES/kPa H2O window
shows 18 or more.

0112-3
 TM 9-2320-341-10 0112

AIR FILTER
RESTRICTION
INDICATOR
R-
INTE E
AXL

8X8

B.O.
TS
LIGH
B.O.
EXH UST
A
ECT
SEL

PULL TO
R
LE LY G
AI PP IN
TR SU RK
R

SUPPLY
AI PA D
R AN
FO
T MIDL
NO PU
SH T

O
M
CHERM
ALA

U
GPP

AUX
HYD HYD
BLE
ENA

M
1
M 2

ASS

HIGH
IDLE

son
Alli ission
sm
Tran

Figure 3.

CONDITION/INDICATION
Does air filter restriction indicator show red and/or VACUUM INCHES H2O window
show 18 or more after being cleaned?

DECISION
Restricted. - Notify Supervisor.
Not restricted. - Test 4 - Does engine start or run roughly after proper warm-up, and/or
does not make full power or makes excessive exhaust smoke?

TEST 4 - Does engine start or run roughly after proper warm-up, and/or does not make
full power or makes excessive exhaust smoke?
1. Test drive vehicle.

CONDITION/INDICATION
Does engine start or run roughly after proper warm-up, and/or does not make full power
or makes excessive exhaust smoke?

DECISION
Runs rough. - Notify Supervisor.
Runs normal. - Problem corrected.

END OF WORK PACKAGE

0112-4
 TM 9-2320-341-10 0113

OPERATOR MAINTENANCE
ENGINE OVERHEATS

INITIAL SETUP:

Equipment Condition Parking brakes applied. (WP 0056)

Engine OFF. (WP 0057) Wheels chocked. (WP 0072)

TROUBLESHOOTING PROCEDURE
ENGINE OVERHEATS

TEST 1 - Are right-side radiator hoses and housing free from leaks?

WARNING

Radiator coolant hoses are very hot and pressurized during vehicle op-
eration. Allow radiator to cool prior to checking hoses. Failure to comply
may result in injury or death to personnel.
1. Open driver and passenger side engine covers. (WP 0143)
2. Check upper and lower radiator hoses and housing for leaks.
3. Check that all clamps are tight and secure.

0113-1
 TM 9-2320-341-10 0113

UPPER
RADIATOR HOSE

HOUSING

THERMOSTAT
HOSE

WATER PUMP
HOSE

HOUSING

LOWER
RADIATOR
HOSE

Figure 1.

CONDITION/INDICATION
Are right-side radiator hoses and housing free from leaks?

DECISION
Radiator hoses and/or housing damaged. - Notify Supervisor. Test 2 - Does engine
overheat?Notify Supervisor.
Radiator hoses and/or housing free from damage and/or leaks. - Notify Supervisor.

TEST 2 - Does engine overheat?

1. Close driver and passenger side engine covers. (WP 0143)
2. Start engine. (WP 0044)

0113-2
 TM 9-2320-341-10 0113

UPPER
RADIATOR HOSE

HOUSING

THERMOSTAT
HOSE

WATER PUMP
HOSE

HOUSING

LOWER
RADIATOR
HOSE

Figure 2.
3. Test drive vehicle.

CONDITION/INDICATION
Does engine overheat?

DECISION
Engine overheats - Notify Supervisor.
Engine OK - Problem corrected.

END OF WORK PACKAGE

0113-3
 TM 9-2320-341-10 0114

OPERATOR MAINTENANCE
LOW OIL PRESSURE GAUGE INDICATION

INITIAL SETUP:

Equipment Condition Parking brakes applied. (WP 0056)

Engine OFF. (WP 0057) Wheels chocked. (WP 0072)

TROUBLESHOOTING PROCEDURE
LOW OIL PRESSURE GAUGE INDICATION

TEST 1 - Is engine oil level low?

1. Check engine oil level. (WP 0130)

ENGINE
DIPSTICK

Figure 1.
2. If oil level is low, fill oil to proper level. (WP 0130)

CONDITION/INDICATION
Is engine oil level low?

DECISION
-
Continue - Test 2 - Is engine oil pressure still low?

TEST 2 - Is engine oil pressure still low?

1. Start engine and allow engine to reach operating temperature. (WP 0044)
2. Check OIL PRESS gauge. Gauge should read as follows:

0114-1
 TM 9-2320-341-10 0114

• At idle, oil pressure can go as low as 5 psi (34 kPa).

• Normal operation range is 40 psi to 60 psi (276 to 414 kPa) between engine
speeds 1800 to 2100 rpm. Minimum for safe operation is 30 psi (207 kPa).

CONDITION/INDICATION
Is engine oil pressure still low?

DECISION
Oil pressure low. - Notify Supervisor.
Oil pressure OK. - Problem corrected.

END OF WORK PACKAGE

0114-2
 TM 9-2320-341-10 0115

OPERATOR MAINTENANCE
EXCESSIVE OIL CONSUMPTION

INITIAL SETUP:

Equipment Condition Parking brakes applied. (WP 0056)

Engine OFF. (WP 0057) Wheels chocked. (WP 0072)

TROUBLESHOOTING PROCEDURE
EXCESSIVE OIL CONSUMPTION

TEST 1 - Are engine oil lines loose?

WARNING

Caution the oil lines could be under pressure be sure to wear the proper
eye protection to avoid personal injury.
1. Open driver and passenger side engine covers. (WP 0143)

0115-1
 TM 9-2320-341-10 0115

Figure 1.
2. Check for loose engine oil lines or damaged components.

CONDITION/INDICATION
Are engine oil lines loose?

DECISION
Lines Loose - Notify Supervisor.
Lines OK - Test 2 - Are any engine oil leaks present?

TEST 2 - Are any engine oil leaks present?

1. Tighten any loose fittings/components if found.
2. Visually check for engine oil leaks.

CONDITION/INDICATION
Are any engine oil leaks present?

0115-2
 TM 9-2320-341-10 0115

DECISION
Leaks found. - Notify Supervisor.
No leaks found. - Notify Supervisor.

END OF WORK PACKAGE

0115-3
 TM 9-2320-341-10 0116

OPERATOR MAINTENANCE
HYDRAULIC SYSTEM OPERATES TOO SLOW, TOO FAST, WITH JERKY
MOVEMENTS; OR ONE OR MORE HYDRAULICS CIRCUITS WILL NOT OPERATE

INITIAL SETUP:

Equipment Condition Parking brakes applied. (WP 0056)

Engine OFF. (WP 0057) Wheels chocked. (WP 0072)

TROUBLESHOOTING PROCEDURE
HYDRAULIC SYSTEM OPERATES TOO SLOW, TOO FAST, WITH JERKY
MOVEMENTS; OR ONE OR MORE HYDRAULICS CIRCUITS WILL NOT OPERATE

TEST 1 - Is hydraulic fluid level within normal operating range?

1. Check hydraulic fluid level. If low, add hydraulic fluid. (WP 0130)

0116-1
 TM 9-2320-341-10 0116

Figure 1.

CONDITION/INDICATION
Is hydraulic fluid level within normal operating range?

DECISION
No - Test 3 - Do all hydraulic systems operate properly?
Yes - Test 2 - Are hydraulic hoses and connections free from leaks and/or damage?

0116-2
 TM 9-2320-341-10 0116

TEST 2 - Are hydraulic hoses and connections free from leaks and/or damage?

WARNING

Caution the hydraulic system maybe under pressure be sure to wear the
proper eye protection to avoid personal injury.
1. Check hydraulic hoses and connections for leaks and/or damage.

0116-3
 TM 9-2320-341-10 0116

(PTO) DRIVEN
HYDRAULIC PUMP

HYDRAULIC
RESERVOIR

PTO DRIVE

SELF-RECOVERY SELECTOR
WINCH VALVE

Figure 2.

0116-4
 TM 9-2320-341-10 0116

2. Attempt to tighten loose hose(s) and/or connection(s).

CONDITION/INDICATION
Are hydraulic hoses and connections free from leaks and/or damage?

DECISION
Hydraulic hose or connection damaged. - Notify Supervisor. Test 3 - Do all hydraulic
systems operate properly?Notify Supervisor.
Hydraulic hoses and connections OK. - Notify Supervisor.

TEST 3 - Do all hydraulic systems operate properly?

1. Start engine. (WP 0044)
2. Operate hydraulic systems to check for proper operation.

CONDITION/INDICATION
Do all hydraulic systems operate properly?

DECISION
No - Notify Supervisor.
Yes - Problem corrected.

END OF WORK PACKAGE

0116-5
 TM 9-2320-341-10 0117

OPERATOR MAINTENANCE
SELF-RECOVERY WINCH DOES NOT WORK

INITIAL SETUP:

Equipment Condition Parking brakes applied. (WP 0056)

Engine OFF. (WP 0057) Wheels chocked. (WP 0072)

TROUBLESHOOTING PROCEDURE
SELF-RECOVERY WINCH DOES NOT WORK

TEST 1 - Is hydraulic fluid level within normal operating range?

1. Check hydraulic fluid level. If low, add hydraulic fluid. (WP 0130)

0117-1
 TM 9-2320-341-10 0117

Figure 1.

CONDITION/INDICATION
Is hydraulic fluid level within normal operating range?

DECISION
No - Test 3 - Does self-recovery winch operate properly?
Yes - Test 2 - Is self-recovery winch shift linkage free from debris and damage?

TEST 2 - Is self-recovery winch shift linkage free from debris and damage?
1. Check self-recovery winch shift linkage for debris and damage. If debris found, clean
shift linkage. (WP 0137)

0117-2
 TM 9-2320-341-10 0117

Figure 2.

CONDITION/INDICATION
Is self-recovery winch shift linkage free from debris and damage?

DECISION
Linkage damaged. - Notify Supervisor. Test 3 - Does self-recovery winch operate
properly?Notify Supervisor.
Linkage OK. - Notify Supervisor.

TEST 3 - Does self-recovery winch operate properly?

1. Start engine. (WP 0044)
2. Check operation of self-recovery winch. (WP 0084)

CONDITION/INDICATION
Does self-recovery winch operate properly?

DECISION
No - Notify supervisor.
Yes - Problem corrected.

END OF WORK PACKAGE

0117-3
 TM 9-2320-341-10 0118

OPERATOR MAINTENANCE
UNUSUALLY NOISY WHEN OPERATING

INITIAL SETUP:

Equipment Condition Parking brakes applied. (WP 0056)

Engine OFF. (WP 0057) Wheels chocked. (WP 0072)

TROUBLESHOOTING PROCEDURE
UNUSUALLY NOISY WHEN OPERATING

TEST 1 - Is self-recovery winch cable free of twists, tangles, or binding?

1. Check if self-recovery winch cable is twisted, tangled, or causing drum to bind. If cable
is tangled, pay out or take up cable as necessary to straighten.

Figure 1.

0118-1
 TM 9-2320-341-10 0118

CONDITION/INDICATION
Is self-recovery winch cable free of twists, tangles, or binding?

DECISION
No - Notify supervisor.
Yes - Test 2 - Is self-recovery winch free of unusual noise when operating?

TEST 2 - Is self-recovery winch free of unusual noise when operating?

1. Start engine. (WP 0044)
2. Operate self-recovery winch, and listen for unusual noise. (WP 0084)

Figure 2.

CONDITION/INDICATION
Is self-recovery winch free of unusual noise when operating?

DECISION
No - Notify supervisor.
Yes - Problem corrected.

END OF WORK PACKAGE

0118-2
 TM 9-2320-341-10 0119

OPERATOR MAINTENANCE
VEHICLE IS HARD TO STEER, SHIMMIES, WANDERS, OR PULLS TO ONE SIDE

INITIAL SETUP:

Equipment Condition Parking brakes applied. (WP 0056)

Engine OFF. (WP 0057) Wheels chocked. (WP 0072)

TROUBLESHOOTING PROCEDURE
VEHICLE IS HARD TO STEER, SHIMMIES, WANDERS, OR PULLS TO ONE SIDE

TEST 1 - Are tires inflated to proper pressure for road condition?

WARNING

• Prior to entering tank, read and follow all safety precautions in FM

10-67-1 . Liquids and vapors carried in the M978 tanker are
flammable and may cause injury or death.
• To prevent fire or explosion, do not allow smoking, flame, sparks, and
hot or glowing objects within 50 ft. (15 m) of vehicle. Failure to comply
may result in injury or death to personnel.

NOTE
• Inflate tires only when they are cool. Inflate to proper pressure for
road condition.
Tire tread is non-directional. Vehicle operation is not affected by di-
rection of traction bars.
1. Check tires for proper inflation. (WP 0128)

0119-1
 TM 9-2320-341-10 0119

Figure 1.
2. If tires are improperly inflated, inflate or deflate tires to proper pressure.

CONDITION/INDICATION
Are tires inflated to proper pressure for road condition?

DECISION
Improperly inflated - Test 3 - Is vehicle hard to steer; or does it shimmy, wander, or pull
to one side?
Inflation OK - Test 2 - Are wheels free of loose, missing, or broken lugnuts?

TEST 2 - Are wheels free of loose, missing, or broken lugnuts?

1. Check for loose, missing, or broken lugnuts.

0119-2
 TM 9-2320-341-10 0119

Figure 2.

CONDITION/INDICATION
Are wheels free of loose, missing, or broken lugnuts?

DECISION
No - Tighten and/or replace loose, missing, or damaged lugnut(s). (WP 0138)
Yes - Notify Supervisor.

TEST 3 - Is vehicle hard to steer; or does it shimmy, wander, or pull to one side?
1. Start engine. (WP 0044)
2. Test drive vehicle.

CONDITION/INDICATION
Is vehicle hard to steer; or does it shimmy, wander, or pull to one side?

0119-3
 TM 9-2320-341-10 0119

DECISION
No - Notify Supervisor.
Yes - Problem corrected.

END OF WORK PACKAGE

0119-4
 TM 9-2320-341-10 0120

OPERATOR MAINTENANCE
VEHICLE STEERING SLOW TO RESPOND OR INTERMITTENT

INITIAL SETUP:

Equipment Condition Parking brakes applied. (WP 0056)

Engine OFF. (WP 0057) Wheels chocked. (WP 0072)

TROUBLESHOOTING PROCEDURE
VEHICLE STEERING SLOW TO RESPOND OR INTERMITTENT

TEST 1 - Is hydraulic fluid low?

1. Check for low hydraulic fluid. (WP 0130)
2. If fluid level is low,add hydraulic fluid. (WP 0130)

0120-1
 TM 9-2320-341-10 0120

Figure 1.

CONDITION/INDICATION
Is hydraulic fluid low?

DECISION
Fluid level low - Test 3 - Is steering slow to respond or intermittent?
Fluid level OK - Test 2 - Are there any leaking or damaged hydraulic fittings or lines?

0120-2
 TM 9-2320-341-10 0120

TEST 2 - Are there any leaking or damaged hydraulic fittings or lines?

WARNING

Caution the hydraulic system maybe under pressure be sure to wear the
proper eye protection to avoid personal injury.
1. Check for leaking or damaged hydraulic lines and/or fittings.

0120-3
 TM 9-2320-341-10 0120

HYDRAULIC
CONNECTION
HYDRAULIC
CONNECTION

HYDRAULIC
LINE
HYDRAULIC
LINES

HYDRAULIC
LINE

HYDRAULIC
CONNECTION

HYDRAULIC
LINE
HYDRAULIC
CONNECTION
HYDRAULIC
CONNECTION

HYDRAULIC
CONNECTION
HYDRAULIC
HYDRAULIC LINE
LINE
HYDRAULIC
HYDRAULIC HYDRAULIC LINE
CONNECTION CONNECTION

Figure 2.
2. If loose hydraulic fluid fittings are found, tighten fittings.

0120-4
 TM 9-2320-341-10 0120

CONDITION/INDICATION
Are there any leaking or damaged hydraulic fittings or lines?

DECISION
Hydraulic lines damaged or leaking. - Ensure fittings are tightened and notify supervisor
of faulty hydraulic lines. Tighten loose fittings. (Test 3 - Is steering slow to respond or
intermittent?)Notify Supervisor.
No leaks, damaged lines or loose fittings found. - Notify Supervisor.

TEST 3 - Is steering slow to respond or intermittent?

1. Start engine. (WP 0044)
2. Test drive vehicle.

CONDITION/INDICATION
Is steering slow to respond or intermittent?

DECISION
Steering faulty - Notify Supervisor.
Steering OK - Problem corrected.

END OF WORK PACKAGE

0120-5
 TM 9-2320-341-10 0121

OPERATOR MAINTENANCE
UNUSUALLY NOISY WHEN OPERATING

INITIAL SETUP:

Equipment Condition Parking brakes applied. (WP 0056)

Engine OFF. (WP 0057) Wheels chocked. (WP 0072)

TROUBLESHOOTING PROCEDURE
UNUSUALLY NOISY WHEN OPERATING

TEST 1 - Is transmission/transfer case free from unusual noise while operating?

1. Start engine. (WP 0044)
2. Test drive vehicle.

Figure 1.

CONDITION/INDICATION
Is transmission/transfer case free from unusual noise while operating?

DECISION
No - Notify supervisor.
Yes - Problem corrected.

END OF WORK PACKAGE

0121-1
 TM 9-2320-341-10 0122

OPERATOR MAINTENANCE
SLOW OR DIFFICULT ENGAGEMENT

INITIAL SETUP:

Equipment Condition Parking brakes applied. (WP 0056)

Engine OFF. (WP 0057) Wheels chocked. (WP 0072)

TROUBLESHOOTING PROCEDURE
SLOW OR DIFFICULT ENGAGEMENT

TEST 1 - Does transmission and/or transfer case engage normally?

1. Start engine. (WP 0044)
2. Test drive vehicle.

Figure 1.

CONDITION/INDICATION
Does transmission and/or transfer case engage normally?

DECISION
No - Notify Supervisor.
Yes - Problem corrected.

END OF WORK PACKAGE

0122-1
 TM 9-2320-341-10 0123

OPERATOR MAINTENANCE
TRANSFER CASE SHIFT LEVER WILL NOT SHIFT

INITIAL SETUP:

Equipment Condition Parking brakes applied. (WP 0056)

Engine OFF. (WP 0057) Wheels chocked. (WP 0072)

TROUBLESHOOTING PROCEDURE
TRANSFER CASE SHIFT LEVER WILL NOT SHIFT

TEST 1 - Does transfer case shift lever shift when transmission is shifted from Neutral
(N) to Drive (D)?
1. Start engine (WP 0044)
2. Move transmission range selector from Neutral (N) to Drive (D). Apply throttle to roll
vehicle slightly, and shift transmission from (D) to (N). As vehicle stops, shift
TRANSFER CASE shift lever.

TRANSMISSION
RANGE
INTER-
AXLE
SELECTOR
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT
LER
PULL TO

TRANSFER
TRAI SUPPKINLYG
AIR PAR D
FOR
NOT MIDLAN
S U P P LY

PUS O
HT

CASE
CHEM
ALARM

AUX
HYD HYD
ENABLE
GPPU
SHIFT LEVER
M
M
1
2

ASS

HIGH
IDLE
nn
ATranlliso
smissio

Figure 1.

0123-1
 TM 9-2320-341-10 0123

CONDITION/INDICATION
Does transfer case shift lever shift when transmission is shifted from Neutral (N) to Drive
(D)?

DECISION
No - Test 2 - Does transfer case shift lever shift when transmission is shifted from
Neutral (N) to Reverse (R)?
Yes - Problem corrected.

TEST 2 - Does transfer case shift lever shift when transmission is shifted from Neutral
(N) to Reverse (R)?
1. Move transmission range selector from Neutral (N) to Reverse (R). Apply throttle to roll
vehicle slightly and shift transmission from R to N. As vehicle stops, shift TRANSFER
CASE shift lever.

TRANSMISSION
RANGE
INTER-
AXLE
SELECTOR
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT
LER
PULL TO

TRANSFER
TRAI SUPPKINLYG
AIR PAR D
FOR
NOT MIDLAN
S U P P LY

PUS O
HT

CASE
CHEM
ALARM

AUX
HYD HYD
ENABLE
GPPU
SHIFT LEVER
M
M
1
2

ASS

HIGH
IDLE
nn
ATranlliso
smissio

Figure 2.

CONDITION/INDICATION
Does transfer case shift lever shift when transmission is shifted from Neutral (N) to
Reverse (R)?

DECISION
No - Test 3 - Is shift cable free of mud and debris?
Yes - Problem corrected.

TEST 3 - Is shift cable free of mud and debris?

1. Turn engine OFF. (WP 0057)

0123-2
 TM 9-2320-341-10 0123

2. Check shift cable for mud and/or debris.

Figure 3.
3. If needed, clean shift cable. (WP 0137)

CONDITION/INDICATION
Is shift cable free of mud and debris?

DECISION
Dirty - Test 4 - Does transfer case shift lever shift normally?
Clean - Notify Supervisor.

TEST 4 - Does transfer case shift lever shift normally?

1. Start engine. (WP 0044)
a. Test drive vehicle.
2. Attempt to shift transfer case. (WP 0048)

0123-3
 TM 9-2320-341-10 0123

TRANSMISSION
RANGE
INTER-
AXLE
SELECTOR
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT
LER

PULL TO
TRANSFER
TRAI SUPPKINLYG
AIR PAR D
FOR
NOT MIDLAN

S U P P LY
PUS O
HT

CASE
CHEM
ALARM

AUX
HYD HYD
ENABLE
GPPU
SHIFT LEVER
M
M
1
2

ASS

HIGH
IDLE
nn
ATranlliso
smissio

Figure 4.
3. Turn engine OFF. (WP 0057)

CONDITION/INDICATION
Does transfer case shift lever shift normally?

DECISION
No - Notify Supervisor.
Yes - Problem corrected.

END OF WORK PACKAGE

0123-4
 TM 9-2320-341-10 0124

OPERATOR MAINTENANCE
TRANS TEMP GAUGE INDICATES OVERHEATING DURING NORMAL OPERATION

INITIAL SETUP:

Equipment Condition Parking brakes applied. (WP 0056)

Engine OFF. (WP 0057) Wheels chocked. (WP 0072)

TROUBLESHOOTING PROCEDURE
TRANS TEMP GAUGE INDICATES OVERHEATING DURING NORMAL OPERATION

TEST 1 - Is transmission fluid at proper operating level?

1. Check transmission fluid level. (WP 0130)

TRANSMISSION
DIPSTICK

Figure 1.
2. If transmission fluid is low, add transmission fluid. (WP 0130)

CONDITION/INDICATION
Is transmission fluid at proper operating level?

DECISION
Transmission fluid was high. - Notify Supervisor. Test 2 - Does TRANS TEMP gauge
indicate overheating during normal operation?
Transmission fluid was at proper level. - Notify Supervisor.

TEST 2 - Does TRANS TEMP gauge indicate overheating during normal operation?
1. Start engine. (WP 0044)
2. Test drive vehicle.

0124-1
 TM 9-2320-341-10 0124

TRANSMISSION
TEMP GAUGE

TRANSMISSION
INTER-
AXLE
8X8

OVER TEMP
B.O.
LIGHTS
B.O.
EXHAUST
SELECT

PULL TO
ER LY
TRAILSUPPKING
AIR PAR
FOR AND

INDICATOR

SUPPLY
NOT MIDL
PU S H T O

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
12

ASS

HIGH
IDLE

AlTranlissmisonsion

Figure 2.

CONDITION/INDICATION
Does TRANS TEMP gauge indicate overheating during normal operation?

DECISION
Overheating - Notify Supervisor.
Correct temperature - Problem corrected.

END OF WORK PACKAGE

0124-2
 TM 9-2320-341-10 0125

OPERATOR MAINTENANCE
WHEEL WOBBLES

INITIAL SETUP:

Equipment Condition Parking brakes applied. (WP 0056)

Engine OFF. (WP 0057) Wheels chocked. (WP 0072)

TROUBLESHOOTING PROCEDURE
WHEEL WOBBLES

TEST 1 - Are any lugnuts loose, missing or broken?

1. Check wheels for loose, missing or broken lugnuts.

0125-1
 TM 9-2320-341-10 0125

Figure 1.

CONDITION/INDICATION
Are any lugnuts loose, missing or broken?

DECISION
No - Tighten or replace lugnut(s). (WP 0138)
Yes - Test 2 - Are any of the wheels bent?

TEST 2 - Are any of the wheels bent?

1. Check to see if any of the wheels are bent.

0125-2
 TM 9-2320-341-10 0125

Figure 2.

CONDITION/INDICATION
Are any of the wheels bent?

DECISION
Wheel bent - Replace damaged wheel(s). (WP 0138)
Wheels OK - Notify Supervisor.

TEST 3 - Do any of the wheels wobble?

1. Start engine. (WP 0044)
2. Test drive vehicle.

CONDITION/INDICATION
Do any of the wheels wobble?

0125-3
 TM 9-2320-341-10 0125

DECISION
Wheel wobbles - Notify Supervisor.
Wheel OK - Notify Supervisor.

END OF WORK PACKAGE

0125-4
 TM 9-2320-341-10 0126

OPERATOR MAINTENANCE
TIRES WORN UNEVENLY OR EXCESSIVELY

INITIAL SETUP:

Equipment Condition Parking brakes applied. (WP 0056)

Engine OFF. (WP 0057) Wheels chocked. (WP 0072)

TROUBLESHOOTING PROCEDURE
TIRES WORN UNEVENLY OR EXCESSIVELY

TEST 1 - Are tires inflated to proper pressure for road condition?

WARNING

Tire air pressure must be checked properly. Failure to comply may result
in injury or death to personnel.

NOTE
• Inflate tires only when they are cool. Inflate to proper pressure for
road condition.
Tire tread is non-directional. Vehicle operation is not affected by di-
rection of traction bars.
1. Check tires for proper inflation. (WP 0131)

0126-1
 TM 9-2320-341-10 0126

Figure 1.
2. If tires are improperly inflated, inflate or deflate to proper pressure.

CONDITION/INDICATION
Are tires inflated to proper pressure for road condition?

DECISION
Improperly inflated - Notify Supervisor.
Inflation OK - Notify Supervisor.

END OF WORK PACKAGE

0126-2
TM 9-2320-341-10

CHAPTER 4

PREVENTIVE
MAINTENANCE
CHECKS AND
SERVICES (PMCS)
 TM 9-2320-341-10 0127

OPERATOR MAINTENANCE
INTRODUCTION - PREVENTIVE MAINTENANCE

PMCS INTRODUCTION

This section contains PMCS requirements for HEMTT series vehicles. The PMCS tables
contain checks and services necessary to ensure that the vehicle is ready for operation.
Using PMCS tables, perform maintenance at specified intervals.

MAINTENANCE FORMS AND RECORDS

Every mission begins and ends with paperwork. There is not much of it, but it must be kept
up. The filled out forms and records have several uses. They are a permanent record of
services, repairs, and modifications made on the vehicle; they are reports to unit
maintenance and to your Commander; and they serve as a checklist to find out what is
wrong with the vehicle after its last use, and whether those faults have been fixed. For the
information needed on forms and records, refer to DA PAM 750-8. (WP 0146)

PREVENTIVE MAINTENANCE CHECKS AND SERVICES

• Do the before (B) PREVENTIVE MAINTENANCE just before operating vehicle.

Pay attention to the CAUTIONS and WARNINGS.
• Do the during (D) PREVENTIVE MAINTENANCE while vehicle and/or its
component systems are in operation. Pay attention to the CAUTIONS and
WARNINGS.
• Do the after (A) PREVENTIVE MAINTENANCE right after operating vehicle. Pay
attention to the CAUTIONS and WARNINGS.
• Do the (W) PREVENTIVE MAINTENANCE weekly. Pay attention to the
CAUTIONS and WARNINGS
• Do the (M) PREVENTIVE MAINTENANCE once a month. Pay attention to the
CAUTIONS and WARNINGS.
• If something does not work, troubleshoot and notify the supervisor.
• Always do PREVENTIVE MAINTENANCE in the same order until it gets to be
habit. Once practiced, problems can be spotted in a hurry.
• If something looks wrong and cannot be fixed right then, write it on DA Form 2404
(WP 0146) or DA Form 5988-E. (WP 0146) If something seems seriously wrong,
report it to organizational maintenance RIGHT NOW.
• When doing PREVENTIVE MAINTENANCE, take along the tools needed and a
rag or two to make all the checks.

0127-1
 TM 9-2320-341-10 0127

GENERAL MAINTENANCE PROCEDURE

• Cleanliness: Dirt, grease, oil, and debris only get in the way and may cover up a
serious problem. Use solvent cleaning compound (WP 0149, Table 1, Item 6, 7,
8, 9, 10, 11) on all metal surfaces and soapy water on rubber.
• Bolts, Nuts, and Screws: Check bolts, nuts, and screws for obvious looseness,
missing, bent, or broken condition and tighten or replace as necessary. They
cannot all be checked with a tool, of course, but look for chipped paint, bare metal,
or rust around bolt heads.
• Welds: Look for loose or chipped paint, rust, or gaps where parts are welded
together. If a bad weld is found, have it repaired.
• Electric Wires and Connectors: Look for cracked or broken insulation, bare
wires, and loose or broken connectors. Tighten loose connectors and make sure
wires are in good shape.
• Hydraulic Lines and Fittings: Look for wear, damage, and leaks, and make sure
clamps and fittings are tight. Wet spots show leaks, of course, but a stain around
a fitting or connector can indicate a leak. If a connector or fitting is loose, tighten
it. If something is broken or worn out, repair or replace per applicable procedure.
• Damage is defined as: Any conditions that affect safety or would render the
vehicle unserviceable for mission requirements.

FLUID LEAKAGE

It is necessary to know how fluid leakage affects the status of fuel, oil, coolant, and the
hydraulic systems. The following are definitions of types/classes of leakage necessary to
know in order to determine the status of the vehicle.

NOTE
Equipment operation is allowable with minor leakage (Class I or II). Con-
sideration must be given to the fluid capacity in the item/system being
checked/inspected. When in doubt, notify the supervisor. When operating
with Class I or II leaks, continue to check fluid levels as required in the
PMCS. Class III leaks should be repaired per applicable procedure.
Class I :Seepage of fluid (as indicated by wetness or discoloration) not great enough to
form drops.
Class II: Leakage of fluid great enough to form drops but not enough to cause drops to
drip from item being checked/inspected.
Class III: Leakage of fluid great enough to form drops that fall from the item being checked/
inspected.

PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)

Prior to performing your PMCS, check with your PLL clerk to verify that the latest
publications are being used by the operator and organizational unit.

0127-2
 TM 9-2320-341-10 0127

Listed below are links to each section of the PMCS. Just click on desired PMCS.
PMCS - BEFORE (WP 0128)
PMCS - DURING (WP 0129)
PMCS - AFTER (WP 0130)
PMCS - WEEKLY (WP 0131)
PMCS - MONTHLY (WP 0133)
PMCS - SEMIANNUAL (WP 0132)
Vehicles designated or dispatched to transport Class A or B ammunition, explosives,
poisons, or radioactive yellow III materials over public highways require more stringent
inspections.
Daily Walk Around PMCS Diagram. This routing diagram will be of help to complete the B,
D, or A PMCS. It shows the vehicle PMCS routing track, which matches the sequence of
PMCS to be performed.

START

Figure 1.

END OF WORK PACKAGE

0127-3
 TM 9-2320-341-10 0128

OPERATOR MAINTENANCE
BEFORE - PREVENTIVE MAINTENANCE

INITIAL SETUP:

Tools and Special Tools

Gloves, Welders

Table 1. PMCS - BEFORE

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

WARNING

Do not start engine or move

vehicle when personnel are
under vehicle or working on
brake lines. Failure to comply
may result in injury or death to
personnel.
WARNING

Ensure engine is OFF and

eye protection is worn when
checking for leaks. Failure to
comply may result in injury or
death to personnel.

0128-1
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

NOTE
Perform Operator's Before,
After, and Weekly PMCS
checks if:
• You are the assigned
driver but have not
operated the vehicle
since the last weekly
inspection.
• You are operating the
vehicle for the first time.
NOTE
• Clean all lubrication
points with cleaning
compound, solvent and
allow to dry prior to
servicing.
• When using a grease
gun, apply lubricant to the
fitting until clean lubricant
squeezes out of the part
being lubricated.
• Always refer to lubrication
instructions (WP 0134) to
ensure equipment has
correct lubricants
appropriate to operating
environment (expected
continuous
temperatures). If not,
remove/drain and
reapply/refill equipment
with appropriate
lubricants for operating
environment as

0128-2
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

prescribed in lubrication
instructions. (WP 0134)

NOTE
If leakage is detected, further
investigation is needed to de-
termine the location and
cause of the leak. If there is
any doubt, contact your su-
pervisor or field level mainte-
nance.

1 Before Driver 1. Check underneath entire length Any fuel,

Side Ex- of driver side of vehicle for fluid Class III
terior and air leaks. leak, or air
lines/fittings
leaking or
damaged.

2. Visually check driver side of ve- Any dam-

hicle for obvious damage that age that
would impair operation. would im-
pair opera-
tion.

NOTE
Ball valve is in ON position
when handle is in line with ball
valve body (shown below).

2 Before Driver 1. Ensure two driver side air sus- Ball valves
Side Air pension ball valves are in ON po- have dam-
Springs sition. (WP 0040) age that
would pre-
vent normal
operation.

0128-3
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

BALL VALVE BODY

HANDLE LOCK HANDLE

BALL VALVE SHOWN IN ON POSITION

Figure 1.

2. Check each air spring for inflation Air springs

and obvious damage. will not in-
flate or have
damage
that would

0128-4
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

prevent nor-
mal opera-
tion.

AIR SPRING

AIR SPRING SHOWN IS ON THE

PASSENGER SIDE OF VEHICLE. EACH AXLE
HAS AN AIR SPRING THAT IS SIMILAR.

Figure 2.

WARNING

Do not operate a vehicle with

a tire in an over-inflated or un-
der-inflated condition, or with
a questionable defect. Failure
to comply may result in injury
or death to personnel and
damage to equipment.

0128-5
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

NOTE
• A tire is bad or in need of
repair if the bead,
sidewall, and tread areas
show signs of damage.
• Remember that this
process requires you to
make judgement calls
and the goal is to safely
maintain equipment in top
quality conditions.

3 Before Driver Check for correct air pressure on Tire miss-

Side each driver side tire and service tire ing, defla-
Tires (WP 0141) as required. ted, or un-
serviceable.

WARNING

Fuel is very flammable and

can explode easily. Keep fuel
away from open fire and keep
fire extinguisher within easy
reach when working with fuel.
Do not work on fuel system
when engine is hot. Fuel can
be ignited when engine is hot.
When working with fuel, post

0128-6
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

signs that read NO SMOKING

WITHIN 50 FEET OF VEHI-
CLE. Failure to comply may
result in injury or death to per-
sonnel.

NOTE
• Drain fuel into suitable
container.
• Operation of vehicle with
malfunctioning fuel/water
separator may violate AR
385-55. (WP 0146)

4 Before Fuel/Wa- 1. Check for level of water in bowl of

ter Sepa- fuel/water separator. If there is
rator water, turn thumb nut on bottom
of bowl to open contaminant
drain valve. Keep drain open until
only pure fuel is flowing out of
drain tube. Close drain valve by
turning thumb nut.

0128-7
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

FUEL/WATER
SEPARATOR

THUMB NUT

Figure 3.

2. Check fuel/water separator for Any fuel

leaks and damage. leak.

5 Before Engine 1. Check engine oil level on dip-

stick.

0128-8
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

ADD FULL
ENGINE OIL
DIPSTICK

Figure 4.

NOTE
Engine oil level should be be-
tween ADD and FULL mark
on dipstick.

a. Add engine oil as required.

(WP 0134, Table 1)

b. Drain excess engine oil as

required, or notify field level
maintenance.

6 Before 24V Bat- Check 24V battery disconnect switch 24V battery
tery Dis- for proper operation. (WP 0074) disconnect
connect switch inop-
Switch erative.

0128-9
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

24V BATTERY
DISCONNECT SWITCH

Figure 5.

7 Before Rear of Visually check rear of vehicle for ob- Any dam-
Vehicle vious damage that would impair op- age that
eration. would im-
pair opera-
tion.

8 Before Air Lines, 1. Check semitrailer air brake lines Air line is
Electrical for obvious damage. missing or
Connec- unservicea-
tor, and ble.
Inter-ve-
hicular
Wiring
Harness

0128-10
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

INTERVEHICULAR
WIRING HARNESS

AIR BRAKE LINES

24 VDC ELECTRICAL
CONNECTOR

Figure 6.

2. Check inter-vehicular wiring har- Electrical

ness, electrical cables and 24 cables and
Vdc connector for obvious dam- connectors
age. have dam-
age that

0128-11
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

would pre-
vent normal
operation.
Inter-vehic-
ular wiring
harness is
missing or
unservicea-
ble.

3. Check operation of work lights.

(WP 0068)

9 Before Fifth 1. Check primary release handle, Mechanism

Wheel linkage, and locking plunger for is damaged
damage and proper operation. or will not
(WP 0030) operate
properly.

PRIMARY
RELEASE HANDLE

SECONDARY
RELEASE HANDLE

Figure 7.

0128-12
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

2. Check secondary release handle Mechanism

linkage and locking plunger for is damaged
damage and proper operation. or will not
(WP 0030) operate
properly.

3. Check that both release handles

are pushed completely in.

10 Before Wheel Ensure vehicle is equipped with four Vehicle is

Chocks wheel chocks. equipped
with less
than four
wheel
chocks.

NOTE
If leakage is detected, further
investigation is needed to de-
termine the location and
cause of the leak. If there is
any doubt, contact your su-
pervisor or field level mainte-
nance.

11 Before Passen- 1. Check underneath entire length Any fuel,

ger Side of driver side of vehicle for fluid Class III
Exterior and air leaks. leak, or air
lines/fittings
leaking or
damaged.

2. Visually check driver side of ve- Any dam-

hicle for obvious damage that age that
would impair operation. would im-

0128-13
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

pair opera-
tion.

12 Before Passen- 1. Ensure two passenger side air Ball valve

ger Side suspension ball valves are in ON damaged/
Air position. (WP 0040) will not
Springs move to ON
position.

AIR SPRING

AIR SPRING SHOWN IS ON THE

PASSENGER SIDE OF VEHICLE. EACH AXLE
HAS AN AIR SPRING THAT IS SIMILAR.

Figure 8.

2. Check each air spring for inflation Air springs

and obvious damage. will not in-
flate or have
damage
that would
prevent nor-
mal opera-
tion.

0128-14
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

WARNING

Do not operate a vehicle with

a tire in an over-inflated or un-
der-inflated condition, or with
a questionable defect. Failure
to comply may result in injury
or death to personnel and
damage to equipment.

NOTE
• Remember that a tire in
storage (spare) can be
flat but not look like it. The
HEMTT tire sidewalls can
support the wheel. Don't
be fooled.
• A tire is bad or in need of
repair if the bead,
sidewall, and tread areas
show signs of damage.
• Remember that this
process requires you to
make judgement calls
and the goal is to safely
maintain equipment in top
quality conditions.

13 Before Passen- 1. Check for correct air pressure on Tire miss-

ger Side each passenger side tire (includ- ing, defla-
Tires (in-

0128-15
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

cluding ing spare tire) and service tire ted, or un-

spare (WP 0141) as required. serviceable.
tire)

WARNING

• During normal vehicle

operation, cooling system
can become very hot.
Allow cooling system to
cool prior to servicing.
Failure to comply may
result in injury to
personnel.
• Use extreme care when
removing radiator cap.
Sudden release of
pressure can cause a
steam flash. Slowly
loosen radiator cap to the
first stop to relieve
pressure before
removing radiator cap
completely. Failure to
comply may result in
injury to personnel.
• Use a clean, thick waste
cloth or like material to
remove radiator cap.
Avoid using gloves. If hot
water soaks through
gloves, personnel could

0128-16
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

be burned. Failure to
comply may result in
injury to personnel.

NOTE
• Coolant should
completely fill lower sight
glass at any engine
temperature.
• Coolant should
completely fill upper sight
glass if engine is hot.
• Coolant should partially
fill upper sight glass if
engine is cold.

14 Before Radiator Check sight glass on radiator to en- Coolant is

sure coolant level is correct. low.

0128-17
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

SIGHT GLASS

RADIATOR

Figure 9.

WARNING

Ensure proper inspection and

maintenance procedures of
seat belt systems are ad-
hered to. Failure to comply
may result in injury or death to
personnel.

NOTE
Vehicle operation with inoper-
ative seat belts may violate
AR 385-55. (WP 0146)

0128-18
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

15 Before Seat 1. Check seat belt strap webbing Webbing is

Belts wear, tears, fraying, etc. cut, frayed
or exces-
sively worn.

STRAP

STRAPS

BUTTON

RETRACTOR

BUCKLE

LATCH

STRAPS

RETRACTORS

Figure 10.

0128-19
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

2. Check latch and buckle for prop- Buckle/latch

er operation, wear, deformation, does not en-
damage, and broken casing. gage with a
solid-
sounding
“click” and/
or does not
release
freely when
button is
pushed.
Molded
plastic
around
buckle/latch
is de-
formed,
cracked, or
broken.

3. Check all seat belt retractors are Retractor(s)

not locked up and pay out/reel in do not oper-
webbing straps properly. ate proper-
ly, or retrac-
tor cover(s)
are
cracked/
broken.

4. Check all seat belt mounting Hardware is

hardware for looseness and oth- loose, miss-
er damage. ing, rusted,
corroded, or
damaged.

16 Before Seats Check operation of seat adjusting Seat adjust-

mechanisms. (WP 0023) ment mech-

0128-20
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

anism bro-
ken or miss-
ing.

ADJ.

HT
HEIG

HEIGHT
ADJUSTMENT
CONTROL

FORWARD/BACKWARD
ADJUSTMENT CONTROL

Figure 11.

17 Before Fire Ex- 1. Check for missing or damaged Fire extin-

tinguish- fire extinguisher. guisher
er (cab) missing or
damaged.

0128-21
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

SEAL

GAUGE

FIRE
EXTINGUISHER

Figure 12.

2. Check gauge for proper pressure Pressure

of about 150 psi (1034 kPa). gauge nee-
dle in RE-
CHARGE
area.

3. Ensure fire extinguisher mount-

ing is secure.

0128-22
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

4. Check for damaged or missing Seal broken

seal. or missing.

NOTE
• Complete all start engine
(WP 0044) procedures,
and comply with all notes,
cautions, and warnings
within that procedure
before completing the
PMCS checks below.
• Once all start engine (WP
0044) procedures are
completed, engine
should be kept running for
the remaining PMCS
checks.

18 Before Engine Start engine. (WP 0044) Engine fails

to start.

NOTE
Check the instruments listed
below for damage, operation,
and condition.

19 Before Instru- 1. Engine oil pressure gauge. Engine oil

ments pressure
gauge is in-
operative.

0128-23
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

BATTERY
TACHOMETER VOLTAGE

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2
3
M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

ENGINE AIR BRAKE

OIL PRESSURE
GAUGE
REAR AIR
FRONT AIR
PRESSURE
PRESSURE
GAUGE
GAUGE

Figure 13.

2. Tachometer. Tachometer
is inopera-
tive or indi-
cates less
than 625
rpm or more
than 725
rpm at idle
after engine
has been
properly
warmed up
(start en-
gine (WP

0128-24
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

0044) pro-
cedure
completed).

3. Battery voltage readout. Battery volt-

age readout
is inopera-
tive, or indi-
cates less
than 24
VDC or
more than
28 VDC with
engine run-
ning.

NOTE
Air pressure buzzer will sound
anytime low air indicator is il-
luminated. Ensure low air in-
dicator and buzzer activate
when air pressure falls below
60 to 70 psi (4.83 bar) in
FRONT air system.

4. FRONT air pressure gauge. FRONT air

pressure
gauge is in-
operative or
indicates
FRONT air
system is
below 70 psi
(4.83 bar)
after engine
has been
properly

0128-25
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

warmed up
(start en-
gine (WP
0044) pro-
cedure
completed).
Low air
pressure in-
dicator and/
or buzzer
remain on,
or do not op-
erate.

NOTE
Air pressure buzzer will sound
anytime low air indicator is il-
luminated. Ensure low air in-
dicator and buzzer activate
when air pressure falls below
60 to 70 psi (4.83 bar) in
REAR air system.

5. REAR air pressure gauge. REAR air

pressure
gauge is in-
operative or
indicates
REAR air
system is
below 70 psi
(4.83 bar)
after engine
has been
properly
warmed up
(start en-

0128-26
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

gine (WP
0044) pro-
cedure
completed).
Low air
pressure in-
dicator and/
or buzzer
remain on,
or do not op-
erate.

6. Air filter restriction indicator. Air filter re-

striction in-
dicator in-
operative,
cracked, or
unservicea-
ble.

0128-27
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

TRANSMISSION AIR FILTER

FUEL OIL TEMPERATURE RESTRICTION
GAUGE GAUGE INDICATOR

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2
3
M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

ENGINE COOLANT
TEMPERATURE

Figure 14.

NOTE
Several minutes are required
for engine to warm up so an
accurate reading can be tak-
en.

7. Engine coolant temperature Engine

gauge. coolant
temperature
gauge is in-

0128-28
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

operative,
or indicates
less than
180°F (82°
C) or more
than 219°F
(104°C) af-
ter engine
has been
properly
warmed up
(start en-
gine (WP
0044) pro-
cedure
completed).

NOTE
Transmission may not reach
160°F (71°C) oil temperature
at idle for several minutes.

8. Transmission oil temperature Transmis-

gauge. sion oil tem-
perature
gauge indi-
cates more
than 250°F
(121°C).

9. Fuel gauge. FUEL

gauge is in-
operative,
or indicates
less than
the required
amount of

0128-29
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

fuel needed
to complete
the mission.

CAUTION
Vehicle must be parked when
making this check. Failure to
comply may result in damage
to equipment. Transfer case
will be damaged if shifted
while vehicle is moving.

NOTE
Engine must be running to
perform this check.

20 Before TRANS- 1. TRANSFER CASE Shift Lever -

FER Check operation: (WP 0048)
CASE
Shift Lev-
er and
Traction
Control
Switch

0128-30
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

INTER-AXLE
INDICATOR TRACTION
CONTROL
8X8 SWITCH
INDICATOR
INTER-
AXLE
8X8

TRANSFER
B.O.
LIGHTS
B.O.
EXHAUST
SELECT
LER

P U LL T O
TRAI SUPPKINLYG
AIR PAR D
FOR
NOT MIDLAN

SUPPLY
CASE SHIFT
PUSH TO

CHEM
ALARM

AUX
HYD HYD
GPPU
LEVER
ENABLE

M
M
1
2
3

ASS

HIGH
IDLE
nn
ATranlliso
smissio

Figure 15.

a. With transmission in N (neu- TRANSFER

tral), shift transfer lever CASE shift
through all range positions. lever inop-
Lever should move freely erable or
through all range positions. binds be-
tween
range de-
tents.

2. Traction Control Switch - Check

operation: (WP 0020)

0128-31
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

a. Switch should interact with Traction

transfer case shift lever to control
show correct indications on switch or in-
instrument panel. (WP 0020) dicators in-
operable.

NOTE
Engine must be running to
perform this check.

21 Before Engine 1. Check engine retarder/brake for

Brake proper operation: (WP 0049)

a. Set transmission range se-

lector to N (neutral) position.

0128-32
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

ENGINE BRAKE
ENGINE BRAKE ENABLE INDICATOR
HIGH/MEDIUM/LOW
SWITCH

INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT
LER

P U LL T O
TRAI SUPPKINLYG
AIR PAR D
FOR
NOT MIDLAN

SUPPLY
PUSH TO

CHEM
ALARM

GPPU

AUX
HYD HYD
ENABLE

M
M
1
2
3

ASS

HIGH
IDLE
nn
ATranlliso
smissio

TRANSMISSION
RANGE SELECTOR

ENGINE BRAKE THROTTLE

ON/OFF SWITCH PEDAL

Figure 16.

b. Push in throttle pedal and in-

crease engine speed to be-
tween 1900 and 2100 rpm.

c. Set engine brake high/medi-

um/low switch to low posi-
tion.

d. Place engine retarder/brake

switch to ON.

0128-33
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

e. Lift foot off throttle pedal and Engine re-

listen for a popping or chat- tarder/brake
tering sound, which indicates does not en-
the engine retarder/brake is gage.
working.

NOTE
Engine must be running to
perform this check.

22 Before Steering 1. Check vehicle steering for proper

operation:

a. Turn steering wheel from full Steering in-

left to full right, back to full operable or
left. binds.

NOTE
Engine must be running to
perform this check.

23 Before HYD EN- Set HYD ENABLE switch to on posi- HYD ENA-
ABLE tion. MAIN HYD ENABLE indicator BLE switch
Switch will illuminate. and/or
MAIN HYD
ENABLE in-
dicator does
not operate.

0128-34
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

HYD ENABLE MAIN HYD ENABLE

SWITCH INDICATOR

CHEM INTER
ALARM AXLE

8X8

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

M 1
2 M

HIGH 0
1
IDLE 2

Figure 17.

NOTE
Operation of vehicle with mal-
functioning windshield wiper
may violate AR 385-55. (WP
0146)

24 Before Wind- 1. Check windshield wiper switch

shield for proper operation. (WP 0031)
Wiper/
Washer
Switches

0128-35
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

CHEM INTER
ALARM AXLE

8X8

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

M 1
2 M

HIGH 0
1
IDLE 2

WINDSHIELD
WIPER CONTROL

Figure 18.

2. Check windshield washer switch

for proper operation. (WP 0031)

NOTE
• Engine must be running
to perform this check.
• Operation of vehicle with
malfunctioning
windshield wiper may
violate AR 385-55. (WP
0146)

25 Before Parking 1. Check PARKING BRAKE control

Brake for proper operation: (WP 0045)
Control

0128-36
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

PARKING BRAKE
CONTROL

CHEM INTER 25 6.2

ALARM AXLE 22 5.5
15 3.7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2
3
M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

Figure 19.

a. With vehicle at idle and serv-

ice brake pedal engaged,
(WP 0046)set transmission
range selector to D (drive).
(WP 0048)

NOTE
Dashboard parking brake in-
dicator will illuminate when
PARKING BRAKE control is
applied.

b. Pull out PARKING BRAKE

control. (WP 0045)

0128-37
 TM 9-2320-341-10 0128

Table 1. PMCS - BEFORE - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

c. Release service brake pedal. Vehicle

(WP 0046) moves with
PARKING
BRAKE
control ap-
plied (pulled
out).

d. Set transmission range se-

lector to N (neutral). (WP
0048)

NOTE
Operator may continue on
with mission if vehicle re-
quires no servicing.

26 Before Engine Shut OFF engine (WP 0057) (as re-

quired).

END OF WORK PACKAGE

0128-38
 TM 9-2320-341-10 0129

OPERATOR MAINTENANCE
DURING - PREVENTIVE MAINTENANCE

INITIAL SETUP:

Tools and Special Tools

Gloves, Welders

Table 1. PMCS - DURING

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

WARNING

Ensure engine is OFF and

eye protection is worn when
checking for leaks. Failure to
comply may result in injury or
death to personnel.
1 During Engine Check and/or listen for excessive Engine has
smoke, unusual noise, rough run- excessive
ning, and misfiring. smoke, un-
usual noise,
runs rough,
or misfires.

NOTE
Check trailer handbrake con-
trol lever only if a trailer is
hooked up to vehicle.

0129-1
 TM 9-2320-341-10 0129

Table 1. PMCS - DURING - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

2 During Trailer Check trailer handbrake control lever Control lev-

Hand- for proper operation. (WP 0047) er does not
brake apply trailer
Control brakes.
Lever

TRAILER HANDBRAKE
CONTROL LEVER

Figure 1.

Listen for actuation. If none, refer to

applicable trailer operator's manual.

NOTE
During operation, all gauges
should maintain the proper
readings listed in the PMCS
BEFORE checks. (WP 0128)

0129-2
 TM 9-2320-341-10 0129

Table 1. PMCS - DURING - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

3 During Instru- Monitor all gauges, indicators, and Gauges, in-

ments warning lights for proper reading and dicators,
operation while operating vehicle. and warning
lights do not
read/oper-
ate proper-
ly.

4 During Trans- Check transmission for proper oper- Transmis-

mission ation. (WP 0048) sion slips or
will not shift.

5 During Steering Be alert for any unusual noise, bind- Steering

ing, or difficulty in steering during op- binds or is
eration. unrespon-
sive.

6 During Service Be alert for chatter, noise, and side Service

Brakes pull. brakes do
not operate
properly.

WARNING

Keep hands clear of heavy-

duty winch cable. Failure to
comply may result in injury or
death to personnel.

0129-3
 TM 9-2320-341-10 0129

Table 1. PMCS - DURING - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

WARNING

• Always wear protective

gloves when handling
winch cable. Never let
cable run through hands.
Frayed cables can cut
severely. Failure to
comply may result in
injury or death to
personnel.
• Never operate winch with
less than five wraps of
cable on winch drum.
Failure to comply may
result in injury or death to
personnel.

7 During Heavy- Check cable of winch for kinks, frays, Evidence of

Duty and breaks. kinks, frays,
Winch or breaks.

0129-4
 TM 9-2320-341-10 0129

Table 1. PMCS - DURING - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

HEAVY-DUTY
WINCH
CABLE

Figure 2.

WARNING

Keep hands clear of heavy-

duty winch cable. Failure to
comply may result in injury or
death to personnel.

0129-5
 TM 9-2320-341-10 0129

Table 1. PMCS - DURING - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

WARNING

• Always wear protective

gloves when handling
winch cable. Never let
cable run through hands.
Frayed cables can cut
severely. Failure to
comply may result in
injury or death to
personnel.
• Never operate winch with
less than five wraps of
cable on winch drum.
Failure to comply may
result in injury or death to
personnel.

NOTE
• PMCS for heavy-duty
winch should only be
performed when retrieval
system is required for
mission.
• Engine must be running
to perform this check.
• Check all controls and
hardware for proper
operation, (WP 0037)
obvious damage, missing

0129-6
 TM 9-2320-341-10 0129

Table 1. PMCS - DURING - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

parts, binding, and

excessive looseness.

8 During Heavy- 1. Check winch control lever. Control mal-

Duty functions,
Winch binds, or
Vehicle does not re-
Mounted spond to in-
(Manual) put.
Controls

WINCH
CONTROL
LEVER CABLE
WINCH HOLD DOWN
KICKOUT CONTROL
CONTROL
HIGH
IDLE
SWITCH

REMOTE-CONTROL
UNIT RECEPTACLE

Figure 3.

0129-7
 TM 9-2320-341-10 0129

Table 1. PMCS - DURING - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

2. Check winch kickout control. Control mal-

functions,
binds, or
does not re-
spond to in-
put.

3. Check cable hold down control. Control mal-

functions,
binds, or
does not re-
spond to in-
put.

4. Check HIGH IDLE switch. Control mal-

functions,
binds, or
does not re-
spond to in-
put.

5. Check remote-control unit recep-

tacle.

WARNING

Keep hands clear of heavy-

duty winch cable. Failure to
comply may result in injury or
death to personnel.

0129-8
 TM 9-2320-341-10 0129

Table 1. PMCS - DURING - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

WARNING

• Always wear protective

gloves when handling
winch cable. Never let
cable run through hands.
Frayed cables can cut
severely. Failure to
comply may result in
injury or death to
personnel.
• Never operate winch with
less than five wraps of
cable on winch drum.
Failure to comply may
result in injury or death to
personnel.

NOTE
• PMCS for heavy-duty
winch should only be
performed when retrieval
system is required for
mission.
• Engine must be running
to perform this check.
• Check all controls and
hardware for proper
operation, (WP 0042)
obvious damage, missing

0129-9
 TM 9-2320-341-10 0129

Table 1. PMCS - DURING - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

parts, binding, and

excessive looseness.

9 During Heavy- 1. Check winch control lever. Control mal-

Duty functions,
Winch binds, or
Remote- does not re-
Control spond to in-
Unit put.

REMOTE-CONTROL
UNIT

WINCH
CONTROL HIGH IDLE
LEVER SWITCH
REMOTE-CONTROL
UNIT CABLE

Figure 4.

0129-10
 TM 9-2320-341-10 0129

Table 1. PMCS - DURING - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

2. Check HIGH IDLE switch. Control mal-

functions,
binds, or
does not re-
spond to in-
put.

3. Check remote-control unit cable.

END OF WORK PACKAGE

0129-11
 TM 9-2320-341-10 0130

OPERATOR MAINTENANCE
AFTER - PREVENTIVE MAINTENANCE

INITIAL SETUP:

Tools and Special Tools

Gloves, Welders

Table 1. PMCS - AFTER

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

WARNING

Do not start engine or move

vehicle when personnel are
under vehicle or working on
brake lines. Failure to comply
may result in injury or death to
personnel.
WARNING

Ensure engine is OFF and

eye protection is worn when
checking for leaks. Failure to
comply may result in injury or
death to personnel.

0130-1
 TM 9-2320-341-10 0130

Table 1. PMCS - AFTER - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

NOTE
Perform Operator's Before,
After, and Weekly PMCS
checks if:
• You are the assigned
driver but have not
operated the vehicle
since the last weekly
inspection.
• You are operating the
vehicle for the first time.
NOTE
• Clean all lubrication
points with cleaning
compound, solvent and
allow to dry prior to
servicing.
• When using a grease
gun, apply lubricant to the
fitting until clean lubricant
squeezes out of the part
being lubricated.
• Always refer to lubrication
instructions (WP 0134) to
ensure equipment has
correct lubricants
appropriate to operating
environment (expected
continuous
temperatures). If not,
remove/drain and
reapply/refill equipment
with appropriate
lubricants for operating
environment as

0130-2
 TM 9-2320-341-10 0130

Table 1. PMCS - AFTER - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

prescribed in lubrication
instructions. (WP 0134)
1 After Under- 1. Check entire underside of vehicle Any fuel,
neath Ve- for fluid and air leaks. Class III
hicle leak, or air
lines/fittings
leaking or
damaged.

2. Check entire underside of vehicle Any fuel

for signs of fluid leakage (fuel, oil, leak. Class
and coolant). III leak of
any other
fluid.

WARNING

Prolonged contact with lubri-

cating oil may cause skin
rash. Immediately wash skin
and clothing that come in con-
tact with lubricating oil thor-
oughly and remove saturated
clothing. Keep area well-ven-
tilated to keep fumes at a min-
imum. Failure to comply may
result in injury or death to per-
sonnel.

CAUTION
Do not fill hydraulic reservoir
past FULL COLD mark. Fail-

0130-3
 TM 9-2320-341-10 0130

Table 1. PMCS - AFTER - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

ure to comply may result in

damage to equipment.

NOTE
• Hydraulic oil expands
when heated, which may
give the operator false
(high) fluid level readings
if the vehicle has been
recently operated.
• If possible, wait until
hydraulic reservoir is
completely cooled down
(minimum of 2 hours)
prior to adding hydraulic
oil, otherwise fill reservoir
to FULL COLD mark.

2 After Hydraulic 1. Check that hydraulic fluid level in

Fluid sight glass on hydraulic fluid res-
Reservoir ervoir is at FULL COLD mark
(may be above FULL COLD mark
if vehicle has been recently op-
erated). If low, add hydraulic oil to
FULL COLD mark:

0130-4
 TM 9-2320-341-10 0130

Table 1. PMCS - AFTER - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

'FULL
COLD'
LEVEL

SIGHT
GLASS

HYDRAULIC
RESERVOIR

Figure 1.

a. Remove cap from hydraulic

reservoir.

b. Fill hydraulic reservoir with

lubricating oil (WP 0134, Ta-
ble 4) until sight glass reads
at FULL COLD mark.

c. Install cap on hydraulic res-

ervoir.

2. Check appearance of hydraulic Fluid ap-

fluid in sight glass. Make sure it is pears milky
clear and not milky or foamy. or foamy.

0130-5
 TM 9-2320-341-10 0130

Table 1. PMCS - AFTER - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

3 After Driver 1. Check wheels for broken, Wheel is

Side cracked, and bent surfaces. broken,
Wheels cracked, or
bent.

2. Check lugnuts and wheel studs Two or

for obvious looseness and dam- more lug-
age. If loose, tighten and report to nuts or
maintenance as soon as practi- studs on the
cal. same wheel
are missing,
broken, or
bent.

4 After Driver Check driver side shock absorbers Damaged

Side for leaks and damage. or Class III
Shock leak
Absorb- present.
ers

5 After Rear Ex- Check rear of vehicle for obvious Any dam-
terior damage that would impair operation. age that
would im-
pair opera-
tion.

6 After Towing Check for presence and condition of

Glad- towing gladhands and rubber grom-
hands mets.

7 After Passen- 1. Check wheels for broken, Wheel is

ger side cracked, and bent surfaces. broken,
Wheels cracked, or
bent.

2. Check lugnuts and wheel studs Two or

for obvious looseness and dam- more lug-

0130-6
 TM 9-2320-341-10 0130

Table 1. PMCS - AFTER - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

age. If loose, tighten and report to nuts or

maintenance as soon as practi- studs on the
cal. same wheel
are missing,
broken, or
bent.

8 After Passen- Check passenger side shock absorb-

ger Side ers for leaks and damage.
Shock
Absorb-
ers

WARNING

Vehicles air system is pres-

surized, be sure to wear prop-
er eye protection and keep
face away from drain valves
while draining air reservoirs.
Open air drain valves slowly
to prevent sudden blast of air.
Failure to comply may result
in injury to personnel.

9 After Air Res- 1. Drain all air reservoirs by opening

ervoirs five air reservoir drain valves on
air system drain manifold under
battery box.

0130-7
 TM 9-2320-341-10 0130

Table 1. PMCS - AFTER - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

AIR RESERVOIR
DRAIN VALVES

Figure 2.

2. Once all air is exhausted from air

reservoirs, close air reservoir
drain valves on air system drain
manifold.

CAUTION
Clean around end of fill tube
prior to removing dipstick.
This will aid in preventing dirt
or foreign matter from enter-
ing the transmission and
causing damage.

0130-8
 TM 9-2320-341-10 0130

Table 1. PMCS - AFTER - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

NOTE
Vehicle is parked (WP 0056)
on a flat, level surface.
Engine is at idle.
Transmission is at normal
operating temperature,
160-200°F (71-93°C).

10 After Trans- 1. With engine running, check

mission transmission fluid level on dip-
stick.
FULL
HOT

TRANSMISSION
ADD
HOT

FLUID
DIPSTICK
COLD
FULL
COLD
ADD

Figure 3.

0130-9
 TM 9-2320-341-10 0130

Table 1. PMCS - AFTER - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

NOTE
Fluid level should be between
HOT FULL and HOT ADD
marks.

2. Add OE/HDO (WP 0134, Table Overfull.

2) as required. Notify field
level main-
tenance.

11 After Spare 1. With engine running, lower tire Tire has

Tire/ carrier (WP 0038) and check cuts, goug-
Wheel spare tire for cuts, gouges, es, or
cracks, or scratches. Remove cracks that
any sharp objects. could result
in tire fail-
ure. Tire is
missing or
unservicea-
ble.

2. Check wheel for broken, Wheel is

cracked, and bent surfaces. broken,
cracked, or
bent.

3. Check lugnuts and wheel studs Two or

for obvious looseness and dam- more lug-
age. nuts or
studs are
missing,
broken, or
bent.

4. Raise tire carrier.

0130-10
 TM 9-2320-341-10 0130

Table 1. PMCS - AFTER - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

12 After Exterior 1. Visually inspect cab and compo- Any compo-

of Cab nents for damage. nent is dam-
aged that
would im-
pair vehicle
mission.

NOTE
Operation of vehicle with bro-
ken/missing mirrors may vio-
late AR 385-55. (WP 0146)

13 After Mirrors Check condition of mirrors.

MIRRORS

Figure 4.

0130-11
 TM 9-2320-341-10 0130

Table 1. PMCS - AFTER - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

NOTE
Operation of vehicle with
damaged or missing wind-
shield may violate AR 385-55.
(WP 0146)

14 After Wind- 1. Check windshield glass for pres-

shield ence and condition.
and Wip-
er Arms/
Blades

WINDSHIELD

WINDSHIELD WIPER
ARMS/BLADES

Figure 5.

0130-12
 TM 9-2320-341-10 0130

Table 1. PMCS - AFTER - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

NOTE
Operation of vehicle with
damaged wiper arms/blades
may violate AR 385-55. (WP
0146)

2. Check condition of wiper arms

and blades.

15 After Fan Check fan control switch for proper

Switch operation (WP 0032) in low, medium,
and high positions.

R-
INTE

8X8

E
AXL

B.O.

B.O.
EXHAUS
PULL TO

R
T

LE G
AI IN
TO SUPP

TR RK
PA
R
FO
TS T
LIGH NO PUS H
ECT LY
SEL PP
M
CHE SU
R D
AI AN
DL
MI

RM
ALA

U
GPP

AUX
HYD

BLE M
HYD ENA
1
M
ASS

HIGH

son ion
Alli iss
nsm
Tra

IDLE

FAN CONTROL
SWITCH

Figure 6.

NOTE
Operation of vehicle with mal-
functioning windshield wash-

0130-13
 TM 9-2320-341-10 0130

Table 1. PMCS - AFTER - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

er may violate AR 385-55.

(WP 0146)

16 After Washer Check windshield washer control for

Control proper operation.

CHEM INTER
ALARM AXLE

8X8

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

M 1
2 M

HIGH 0
1
IDLE 2

WINDSHIELD
WASHER CONTROL

Figure 7.

NOTE
Operation of vehicle with mal-
functioning windshield wiper
may violate AR 385-55. (WP
0146)

17 After Wiper Check windshield wiper control for

Control proper operation (WP 0031) in both
low and high speed position.

0130-14
 TM 9-2320-341-10 0130

Table 1. PMCS - AFTER - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

CHEM INTER
ALARM AXLE

8X8

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

M 1
2 M

HIGH 0
1
IDLE 2

WINDSHIELD
WIPER CONTROL

Figure 8.

NOTE
Operation of vehicle with mal-
functioning horn may violate
AR AR 385-55. (WP 0146)

18 After Horns Check both horns (air and electric) for

proper operation.

NOTE
• Light checks will require
assistance.
• Operation of vehicle with
malfunctioning turn signal

0130-15
 TM 9-2320-341-10 0130

Table 1. PMCS - AFTER - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

control may violate AR

385-55. (WP 0146)

19 After Turn Sig- Check turn signal control for proper

nal Con- operation. (WP 0019)
trol

TURN SIGNAL
CONTROL LEVER

Figure 9.

20 After Turn Sig- Check turn signal indicators for prop-

nal Indi- er operation. (WP 0020)
cators

0130-16
 TM 9-2320-341-10 0130

Table 1. PMCS - AFTER - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

LEFT TURN RIGHT TURN

SIGNAL INDICATOR SIGNAL INDICATOR

CHEM INTER
ALARM 25 6.2
AXLE 22 5.5
15 3.7
11 2.7

8X8 8 2.0

IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0
1 TRAILER
IDLE 2
AIR SUPPLY

Figure 10.

NOTE
• Light checks will require
assistance.
• Operation of vehicle with
malfunctioning
emergency flasher
control may violate AR
385-55. (WP 0146)

21 After Emer- Check emergency flasher control for

gency proper operation. (WP 0019)
Flasher
Control

0130-17
 TM 9-2320-341-10 0130

Table 1. PMCS - AFTER - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

EMERGENCY
FLASHER
CONTROL

Figure 11.

NOTE
• Light checks will require
assistance.
• Operation of vehicle with
malfunctioning service
lights may violate AR
385-55. (WP 0146)

22 After Lights Check headlights, clearance lights,

turn signals, and brake lights for prop-
er operation.

NOTE
Operation of vehicle with mal-
functioning beacon light may

0130-18
 TM 9-2320-341-10 0130

Table 1. PMCS - AFTER - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

violate AR 385-55. (WP

0146)

23 After Portable Remove beacon light from glove box

Beacon and check for proper operation. (WP
Light (If 0069)
equip-
ped)

WARNING

Keep hands clear of heavy-

duty winch cable. Failure to
comply may result in injury or
death to personnel.

WARNING

• Always wear protective

gloves when handling
winch cable. Never let
cable run through hands.
Frayed cables can cut
severely. Failure to
comply may result in
injury or death to
personnel.

0130-19
 TM 9-2320-341-10 0130

Table 1. PMCS - AFTER - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

• Never operate winch with

less than five wraps of
cable on winch drum.
Failure to comply may
result in injury or death to
personnel.

NOTE
Complete this PMCS proce-
dure only if heavy-duty winch
was used during mission.

24 After Heavy- 1. Check for evidence of bent or Class III

Duty crushed hydraulic hoses or leak- leak
Winch (if age at any threaded coupling or present.
used) quick disconnect. Lines or fit-
tings are
damaged.

NOTE
This procedure is a two sol-
dier task.

2. Unwind heavy-duty winch cable Evidence of

(WP 0042) and check cable of kinks, frays,
winch for kinks, frays, or breaks. or breaks.

0130-20
 TM 9-2320-341-10 0130

Table 1. PMCS - AFTER - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

HEAVY-DUTY
WINCH
CABLE

Figure 12.

NOTE
This procedure is a two sol-
dier task.

3. Clean and lubricate heavy-duty

winch cable with OE/HDO. (WP
0134)

NOTE
• Complete drain and refill
of heavy-duty winch drum
gearbox after first 10
hours of heavy-duty
winch operation.
• After initial 10 hour drain
and refill this procedure

0130-21
 TM 9-2320-341-10 0130

Table 1. PMCS - AFTER - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

becomes an annual
requirement.

4. Drain and refill heavy-duty recov-

ery winch gearboxes (both motor
end and gear end) with lubricant
appropriate to operating environ-
ment (refer to lubrication instruc-
tions for more information). (WP
0134)

BREATHER

FILL

DRAIN

Figure 13.

END OF WORK PACKAGE

0130-22
 TM 9-2320-341-10 0131

OPERATOR MAINTENANCE
WEEKLY - PREVENTIVE MAINTENANCE

INITIAL SETUP:

Tools and Special Tools

Gloves, Welders

Table 1. PMCS - WEEKLY

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

WARNING

Do not start engine or move

vehicle when personnel are
under vehicle or working on
brake lines. Failure to comply
may result in injury or death to
personnel.
WARNING

Ensure engine is OFF and

eye protection is worn when
checking for leaks. Failure to
comply may result in injury or
death to personnel.

0131-1
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

NOTE
Perform Operator's Before,
After, and Weekly PMCS
checks if:
• You are the assigned
driver but have not
operated the vehicle
since the last weekly
inspection.
• You are operating the
vehicle for the first time.
NOTE
• Lubrication intervals are
for normal operating
conditions. Intervals may
be shortened as required
for severe operating
conditions.
• Clean all lubrication
points with cleaning
compound, solvent and
allow to dry prior to
servicing.
• When using a grease
gun, apply lubricant to the
fitting until clean lubricant
squeezes out of the part
being lubricated.
• Always refer to lubrication
instructions (WP 0134) to
ensure equipment has
correct lubricants
appropriate to operating
environment (expected
continuous

0131-2
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

temperatures). If not,
remove/drain and
reapply/refill equipment
with appropriate
lubricants for operating
environment as
prescribed in lubrication
instructions. (WP 0134)

WARNING

Do not operate a vehicle with

a tire in an over-inflated or un-
der-inflated condition, or with
a questionable defect. Failure
to comply may result in injury
or death to personnel and
damage to equipment.

1 Weekly Driver Check tires for correct air pressure.

Side
Tires

2 Weekly Propeller 1. Check propeller shafts and U- Propeller

Shafts joints for excessive movement, shaft or U-
and U- obvious damage, and loose, Joint has
Joints missing or broken nuts and excessive
screws. movement,
obvious
damage, or
one or more
nuts or
screws are
loose, miss-

0131-3
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

ing, or dam-
aged.

PROPELLER
SHAFTS

Figure 1.

NOTE
• When vehicle is operating
under severe conditions,
lubricate propeller shafts
and universal joints every
50 hours of vehicle
operation.
• Complete Step 2 only if
vehicle is operating under
severe conditions.

2. Lubricate all propeller shafts,

transmission to transfer case

0131-4
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

propeller shaft, and U-joints with

GAA (WP 0134) as required (re-
fer to operator's semiannual
PMCS table (item no. 2) for pro-
cedures. (WP 0132)

3 Weekly Axle Check four axle breathers for dam- Any axle
Breath- age and free movement of vent caps breather
ers on breather body. caps are
damaged or
vent caps
do not move
freely on
breather
body.

0131-5
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

FRONT OF AXLE
VEHICLE BREATHER

VENT
CAP

BREATHER
BODY

Figure 2.

NOTE
Operation of vehicle with
damaged/malfunctioning air
compressor may violate AR
385-55. (WP 0146)

0131-6
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

4 Weekly Air Com- Check air compressor for loose Screws

pressor screws, damaged mounting flange missing,
and air hoses, and loose fittings/con- mounting
nections. flange bro-
ken, air ho-
ses dam-
aged or fit-
tings/con-
nections
loose.

AIR
COMPRESSOR

Figure 3.

5 Weekly Secon- Check secondary fuel filter for leaks Any fuel
dary Fuel or damage. leak.
Filter

0131-7
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

SECONDARY
FUEL FILTER

Figure 4.

NOTE
Operation of vehicle with any
exhaust leaks may violate AR
385-55. (WP 0146)

6 Weekly Exhaust Check exhaust pipe, muffler, heat- Exhaust

System shield, tailpipe, raincap, clamps, and pipe be-
mounting for obvious damage, loose- tween tur-
ness, exhaust leak, and carbon build- bocharger
up. and exhaust
manifold
leaks. Any
exhaust
pipe miss-

0131-8
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

ing or dam-
aged.

RAINCAP
MUFFLER
HEATSHIELD

TAILPIPE
CLAMPS

Figure 5.

7 Weekly Fuel Check fuel tank, fuel hoses, fuel tank Any fuel
Tank connections, and fuel tank socket leak.
head pipe plug for leaks and/or dam-
age.

0131-9
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

FUEL LINES
CONNECTIONS

STRAPS

CONNECTIONS

FUEL TANK

PIPE PLUG

Figure 6.

8 Weekly Fuel Check fuel tank strainer for clogs or

Tank damage. If strainer is clogged, clean
Strainer strainer.

0131-10
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

FUEL TANK
STRAINER

Figure 7.

9 Weekly Hydraulic Check hydraulic pump for loose Any Class

Pump screws, leaks, and damage. Check III leak
for loose hose fittings. present or
any mount-
ing screw is
loose or
missing.

0131-11
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

HYDRAULIC
PUMP

Figure 8.

10 Weekly Hydraulic Check all hydraulic hose routing for Class III
Hoses obvious damage to hydraulic hoses, leak
chaffing, and leaks. present.
Chaffing or
obvious
damage to
hydraulic
hose
present.

NOTE
Clean and re-lubricate fifth
wheel parts more often when
vehicle is operated in sandy
or dusty conditions. Lubricate

0131-12
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

daily under severe operating

conditions.

11 Weekly Fifth 1. Clean fifth wheel plate and coat

Wheel lightly (completely cover) with
Lubrica- GAA. (WP 0134, Table 9)
tion

FIFTH WHEEL
PLATE JAW LUBE
FIFTH WHEEL POINT
APPROACH RAMPS

Figure 9.

2. Clean fifth wheel approach

ramps and coat lightly (complete-
ly cover) with GAA. (WP 0134,
Table 9)

3. Clean fifth wheel jaws and coat

with GAA. (WP 0134)

0131-13
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

12 Weekly Stowage 1. Check all stowage boxes/com-

Boxes partments for missing hardware
and other obvious damage.

2. Check inside all stowage boxes/

compartments for torn or dam-
aged seals, water in bottom of
stowage box/compartment, or
other obvious damage.

13 Weekly Rear Check rear spring/parking brake

Spring/ chambers to ensure dust covers are
Parking in place and secure.
Brake
Cham-
bers

14 Weekly Towing Check towing shackles for servicea-

Shackles bility.

15 Weekly Pintle 1. Check pintle hook for looseness Pintle hook

Hook and damaged locking mecha- loose or
nism of locking pin. locking
mechanism
damaged/
unservicea-
ble.

0131-14
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

PINTLE
HOOK

Figure 10.

2. Clean pintle hook and coat with

GAA. (WP 0134, Table 9)

16 Weekly Rear Lift- Check rear lifting shackles for serv-

ing iceability.
Shackles

17 Weekly Inter-ve- Check inter-vehicle connector seal

hicle and cable for damage.
Connec-
tor

0131-15
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

INTER-VEHICLE
ELECTRICAL
CONNECTOR

Figure 11.

WARNING

Do not operate a vehicle with

a tire in an over-inflated or un-
der-inflated condition, or with
a questionable defect. Failure

0131-16
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

to comply may result in injury

or death to personnel and
damage to equipment.

NOTE
Inspection of passenger side
tires includes spare tire.

18 Weekly Passen- Check tires for correct air pressure.

ger Side
Tires

WARNING

Wear proper eye and skin

protection when working
around batteries. Do not
smoke, have open flames, or
make sparks around batter-
ies, especially if caps are off.
Batteries can explode. Failure
to comply may result in injury
or death to personnel.

0131-17
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

WARNING

Remove all jewelry such as

rings, ID tags, bracelets, etc.
prior to working on or around
vehicle. Jewelry and tools can
catch on equipment, contact
positive electrical circuits, and
cause a direct short, severe
burns, or electrical shock.
Failure to comply may result
in injury or death to personnel.

19 Weekly Batteries 1. Check battery box for damage. Cracks or

holes in bat-
tery box.

BATTERY BOX

Figure 12.

2. Check battery cables for pres- Battery ca-

ence, frays, splits, and loose- bles miss-
ness. ing, frayed,

0131-18
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

split, or
loose.

3. Check for loose, missing, or dam- One or

aged batteries and corroded or more batter-
burnt battery terminals. ies missing,
cracked, or
unservicea-
ble. Any
battery ter-
minal corro-
ded or
burnt. Any
hold down
not secure.

NOTE
The tire carrier pump will nor-
mally vent a small amount of
oil as a mist when in use. This
results in a coating of oil on
the pump and the immediate
surrounding area. This is nor-
mal and is not to be consid-
ered as a leak.

20 Weekly Tire Car- 1. Check tire carrier pump for obvi- Tire carrier
rier ous damage and leaks. pump has
obvious
damage or
Class III
leak is
present.

0131-19
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

RAISE/LOWER
LEVER
POWER
BUTTON

STOWAGE
BRACKETS

TIRE CARRIER
PUMP

TIRE
TIRE CARRIER LOCK RODS CARRIER
LATCH

Figure 13.

2. Check tire carrier latch for obvi- Tire carrier

ous damage and leaks. latch has
obvious

0131-20
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

damage or
Class III
leak is
present.

3. Check operation/lower tire carri-

er: (WP 0038)

a. Remove both lock rods from

tire carrier and place on
stowage brackets.

WARNING

If tire carrier is in any position

other than full up and locked
(tire carrier latch engaged) or
resting on ground, only tire
carrier pump operator should
be within six feet (1.83 m) of
passenger side of vehicle
from battery box forward. Fail-
ure to comply may result in
personnel being struck by tire
carrier/spare tire, causing in-
jury or death to personnel.

CAUTION
• Ensure passenger side of
vehicle has six ft. (1.8 m)
of clearance from battery
box forward to

0131-21
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

accommodate lowering
of tire carrier or damage
to equipment may result.
• Do not dump air
suspension system with
tire carrier in down
position. Damage to tire
carrier arm may result.

NOTE
• Once tire carrier has
passed vertical
(approximately 6 in.
[15.24 cm] of movement),
release power control (9)
and allow the tire carrier
to lower on its own until
tire contacts ground.
• The tire carrier can be
stopped at any time
during lowering
operations by releasing
the power control and
moving the directional
control lever to RAISE
(pointing inboard)
position.

b. Set directional control lever Tire carrier

to LOWER (pointing out- does not
board) position. Push and lower to
hold power control on tire ground.
carrier pump to lower tire to
ground.

0131-22
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

21 Weekly Air Intake 1. Check air intake system for dam- Air intake
System aged air intake tube and loose system has
clamps. Tighten clamps as nee- damaged
ded. air intake
tube or un-
serviceable
clamps.

AIR INTAKE
CLAMP TUBE
HAND AIR CLEANER
KNOB HOUSING

Figure 14.

2. Check air cleaner housing for

loose hand knobs. Tighten as
needed.

22 Weekly Air Dryer Check air dryer for loose screws and
connections.

0131-23
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

AIR
DRYER

Figure 15.

NOTE
Pressurize air system prior to
performing this check.

23 Weekly Air Lines Check routing, for obvious damage to Any leaks or
and Ho- air lines and hoses. Check for leaks. damage to
ses air lines, ho-
ses, or fit-
tings are
found.

24 Weekly Radiator 1. Check radiator and hoses for Any Class

and Ho- leaks, clogs, or damaged fins. III leak.
ses Check for loose hose clamps.

0131-24
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

SIGHT GLASS

RADIATOR

Figure 16.

CAUTION
Ensure lock rods are secured
on stowage brackets before
raising tire carrier. Damage to
tire carrier may result.

NOTE
• Raising the tire carrier
requires approximately
70 psi (5 bar) of air from
the vehicle rear air
system. If possible, the
operator should start
engine (WP 0044) and let
idle during raise
operation to ensure
adequate supply of air.

0131-25
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

• Ensure engine covers are

closed before raising tire
carrier.

25 Weekly Raise 1. Raise tire carrier:

Tire Car-
rier

0131-26
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

RAISE/LOWER
LEVER
POWER
BUTTON

STOWAGE
BRACKETS

TIRE CARRIER
PUMP

TIRE
TIRE CARRIER LOCK RODS CARRIER
LATCH

Figure 17.

0131-27
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

2. Set directional control lever to

RAISE (pointing inboard) posi-
tion.

3. Push and hold power control until Tire carrier

tire carrier is fully raised and tire does not
carrier latch is engaged. raise or
does not en-
gage carrier
latch.

4. Remove lock rods from stowage

brackets and install on tire carri-
er.

5. Tighten lock rods as required to

properly secure tire carrier.

NOTE
Operation of vehicle with
damaged doors or windows
may violate AR 385-55. (WP
0146)

26 Weekly Doors, Check condition and operation of

Handles, door, handles, and windows. (WP
and Win- 0018)
dows

27 Weekly Drive 1. Check drive belts for cracking, Any drive

Belts and fraying, and breaks. Check for belt is bro-
Pulleys tightness. Play should be about ken,
1/2 in. (13 mm). cracked to
the belt fi-
ber, has
more than

0131-28
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

one crack
(1/8 in. in
depth or
50% of belt
thickness),
has frays
more than 2
in. long or
excessive
play.

DRIVE
BELTS

PULLEYS

Figure 18.

2. Check for bent or damaged pul- Pulley dam-

ley. aged or un-
serviceable.

0131-29
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

NOTE
Start Engine. (WP 0044) En-
gine must be running for re-
maining PMCS checks.

28 Weekly Cab 1. Check cab temperature controls

Tempera- for proper for proper operation:
ture Con- (WP 0032)
trols

VENT
CONTROL
CABIN AIR
DIRECTIONAL
INTE
R-
CONTROL
8X8

E
AXL

B.O.

B.O.
EXHAUS
PULL TO

R
LE G
AI IN
TR
O SUPPLY

RK
PA
R

HEATER
TS FO
LIGH T
NO PU
ECT SH T
SEL LY
PP
SU
M R D
CHE AI
AN
DL
MI

ALA
RM

TEMPERATURE
CONTROL
U
GPP

AUX
HYD

BLE
HYD ENA
M
1
M

ASS

HIGH

son ion
Alli iss
nsm
Tra

IDLE

AIR CONDITIONING
FAN CONTROL
CONTROL

VENT
CONTROL

Figure 19.

a. Check two vent controls.

0131-30
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

b. Check fan control.

c. Check cabin air directional

control.

d. Check heater temperature

control.

e. Check air conditioning con-

trol.

29 Weekly Heavy- 1. Check for evidence of bent or Class III

Duty crushed hydraulic hoses or leak- leak
Winch age at any threaded coupling or present.
quick disconnect. Hoses or fit-
tings are
damaged.

2. Check cable hold down for obvi-

ous damage.

0131-31
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

CABLE
HOLD DOWN

Figure 20.

WARNING

Keep hands clear of heavy-

duty winch cable. Failure to
comply may result in injury or
death to personnel.

0131-32
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

WARNING

Always wear protective

gloves when handling winch
cable. Never let cable run
through hands. Frayed cables
can cut severely. Failure to
comply may result in injury or
death to personnel.

NOTE
This procedure is a two sol-
dier task.

3. Pay out heavy-duty winch cable Evidence of

(WP 0042) and check cable for kinks, frays,
kinks, frays, or breaks. or breaks.

0131-33
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

HEAVY-DUTY
WINCH
CABLE

Figure 21.

4. Check heavy-duty winch manual Controls

control lever for proper operation malfunction,
(WP 0037) in both directions. bind, or do
not re-
spond.

0131-34
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

WINCH CONTROL
LEVER

Figure 22.

5. Check heavy-duty winch remote Controls

control and cable for proper op- malfunction,
eration (WP 0042) obvious dam- bind, or do
age, missing parts, binding, and not re-
excessive looseness. spond.

0131-35
 TM 9-2320-341-10 0131

Table 1. PMCS - WEEKLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

HEAVY-DUTY WINCH
REMOTE CONTROL
CABLE

Figure 23.

NOTE
This procedure is a two sol-
dier task.

6. Clean and lubricate heavy-duty

winch cable with OE/HDO. (WP
0134)

END OF WORK PACKAGE

0131-36
 TM 9-2320-341-10 0132

OPERATOR MAINTENANCE
SEMIANNUAL - PREVENTIVE MAINTENANCE

INITIAL SETUP:

Tools and Special Tools

Gloves, Welders

Table 1. PMCS- SEMIANNUAL

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

WARNING

Do not start engine or move

vehicle when personnel are
under vehicle or working on
brake lines. Failure to comply
may result in injury or death to
personnel.
WARNING

Ensure engine is OFF and

eye protection is worn when
checking for leaks. Failure to
comply may result in injury or
death to personnel.

0132-1
 TM 9-2320-341-10 0132

Table 1. PMCS- SEMIANNUAL - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

NOTE
• Lubrication intervals are
for normal operating
conditions. Intervals may
be shortened as required
for severe operating
conditions.
• Clean all lubrication
points with cleaning
compound, solvent and
allow to dry prior to
servicing.
• When using a grease
gun, apply lubricant to the
fitting until clean lubricant
squeezes out of the part
being lubricated.
• Always refer to lubrication
instructions (WP 0134) to
ensure equipment has
correct lubricants
appropriate to operating
environment (expected
continuous
temperatures). If not,
remove/drain and
reapply/refill equipment
with appropriate
lubricants for operating
environment as
prescribed in lubrication
instructions. (WP 0134)
1 Semian- Brake Lubricate axles No. 1, No. 2, No. 3, Fitting will
nual System and No. 4 brake camshafts and slack not purge
old lubricant

0132-2
 TM 9-2320-341-10 0132

Table 1. PMCS- SEMIANNUAL - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

adjusters (four fittings per axle) with out of com-

GAA. (WP 0134, Table 9) ponent.

SLACK ADJUSTER
LUBE FITTING BRAKE CAMSHAFT
LUBE FITTING

Figure 1.

NOTE
• When vehicle is operating
under severe conditions,
lubricate propeller shafts
and universal joints every
50 hours of vehicle
operation.

0132-3
 TM 9-2320-341-10 0132

Table 1. PMCS- SEMIANNUAL - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

• Use the proper lubricant

to purge all four bearing
seals of each universal
joint. This flushes
abrasive contaminants
from each bearing and
assures all four bearings
are filled properly. Pop
the seals, these seals are
made to be popped.
• If any seals fail to purge,
move propeller shaft from
side-to-side while
applying gun pressure.
This allows greater
clearance on thrust end of
bearing that is not
purging. If seals still do
not purge, rock vehicle by
releasing the parking
brake, start engine, put
transmission in D (drive)
or R (reverse), and allow
vehicle to roll. This
removes the windup in
the drive line and allows
for a greater clearance on
the thrust end of the
universal joint.
• Because of the design of
the universal joint seal,
there will occasionally be
one or more bearing
seals of a joint that may
not purge. If this occurs,
notify field level
maintenance.

0132-4
 TM 9-2320-341-10 0132

Table 1. PMCS- SEMIANNUAL - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

• Universal joint may have

one or two grease fittings.
If there are two grease
fittings, either fitting can
be greased. It is not
necessary to grease both
fittings.

2 Semian- Propeller 1. Lubricate all axle propeller Fitting will

nual Shafts shafts, transmission to transfer not purge
and U- case propeller shaft, and U-joints old lubricant
Joints with GAA: (WP 0134, Table 9) out of com-
ponent.

0132-5
 TM 9-2320-341-10 0132

Table 1. PMCS- SEMIANNUAL - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

SLEEVE YOKE SEAL

NO. 1 AXLE PROPELLER

SHAFT AND U-JOINTS

NO. 2 AXLE PROPELLER

SPLINE U-JOINT
SHAFT AND U-JOINTS U-JOINT FITTING CROSS
CROSS
FITTING
FITTING SPLINE
NO. 3 AXLE PROPELLER FITTING
SHAFT AND U-JOINTS

NO. 4 AXLE PROPELLER

SHAFT AND U-JOINTS TYPICAL PROPELLER SHAFT

TRANSMISSION/TRANSFER
CASE PROPELLER SHAFT
AND U-JOINTS

Figure 2.

a. Complete the following when Fitting will

lubricating the spline end of not purge
the propeller shafts: old lubricant
out of com-
ponent.

(1) Apply GAA (WP 0134,

Table 9) to spline fitting

0132-6
 TM 9-2320-341-10 0132

Table 1. PMCS- SEMIANNUAL - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

until lubricant appears at

pressure relief hole.

(2) Cover pressure relief

hole with finger and con-
tinue adding grease until
it appears at sleeve yoke
seal.

3 Semian- Steering 1. Lubricate steering column link- Damage or

nual System age, two steering gear boxes, wear
and steering shaft universal present. Fit-
joints (four fittings) with GAA. ting will not
(WP 0134, Table 9) purge old lu-
bricant out
of compo-
nent.

0132-7
 TM 9-2320-341-10 0132

Table 1. PMCS- SEMIANNUAL - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

STEERING
GEAR BOX
STEERING SHAFT
UNIVERSAL JOINTS

STEERING
GEAR BOX
STEERING
COLUMN
LINKAGE

STEERING SHAFT
BEARING

Figure 3.

2. Lubricate steering shaft bearing Fitting will

(four fittings) with GAA. (WP not purge
0134, Table 9) old lubricant
out of com-
ponent.

3. Lubricate master steering gear Fitting will

input shaft end (one fitting) with not purge
GAA. (WP 0134, Table 9) old lubricant
out of com-
ponent.

0132-8
 TM 9-2320-341-10 0132

Table 1. PMCS- SEMIANNUAL - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

FRONT SUSPENSION MASTER STEERING

HANGER NOT SHOWN GEAR LUBE FITTING
FOR CLARITY

Figure 4.

NOTE
• The top trunnion bearing
should be given 10 to 12
strokes with a grease gun
through existing fitting.
• The plug below the
bottom should
temporarily be removed
and a grease fitting
installed. The lower
trunnion bearing should
be lubricated with 10 to
12 strokes from a grease

0132-9
 TM 9-2320-341-10 0132

Table 1. PMCS- SEMIANNUAL - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

gun. The grease fitting

should then be removed
and the plug reinstalled.

4. Lubricate axles No. 1 and No. 2 Fitting will

trunnion bearings with GAA. (WP not purge
0134, Table 9) old lubricant
out of com-
ponent.

AXLE NO. 1

LUBE
FITTINGS

AXLE NO. 2 TRUNNION BEARINGS

(PASSENGER SIDE)
LUBE
FITTINGS

TRUNNION BEARINGS
(DRIVER SIDE)

Figure 5.

0132-10
 TM 9-2320-341-10 0132

Table 1. PMCS- SEMIANNUAL - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

4 Semian- Battery Coat slave receptacle with corrosion

nual Electrical preventive compound.
System

SLAVE
RECEPTACLE

Figure 6.

5 Semian- Mirror As- Lubricate mirror assembly swivel

nual sembly joints with GAA. (WP 0134)

LUBE 4
LOCATIONS

Figure 7.

0132-11
 TM 9-2320-341-10 0132

Table 1. PMCS- SEMIANNUAL - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

6 Semian- Fifth 1. Lubricate locking linkage,

nual Wheel springs, and pivot points with OE/
HDO. (WP 0134, Table 8)

LOCKING LINKAGES

PIVOT
POINTS
LUBE
FITTINGS

LUBE LUBE
FITTINGS FITTINGS

LUBE FITTINGS LUBE FITTING

Figure 8.

2. Lubricate fifth wheel (nine fit- Fitting will

tings) with GAA. (WP 0134, Ta- not purge
ble 9) old lubricant

0132-12
 TM 9-2320-341-10 0132

Table 1. PMCS- SEMIANNUAL - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

out of com-
ponent.

7 Semian- Heavy- 1. Lubricate winch mounts (three fit- Fitting will

nual Duty tings) with GAA. (WP 0134, Ta- not purge
Winch ble 9) old lubricant
out of com-
ponent.

WINCH MOUNT
LUBE POINT WINCH MOUNT
LUBE POINTS

Figure 9.

2. Check level of heavy-duty recov-

ery winch gearboxes (both motor
end and gear end) and fill with
GO. (WP 0134, Table 7) as re-
quired.

0132-13
 TM 9-2320-341-10 0132

Table 1. PMCS- SEMIANNUAL - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

BREATHER

FILL

DRAIN

Figure 10.

8 Semian- Roller As- 1. Lubricate roller assembly (two fit- Fitting will
nual sembly tings) with GAA. (WP 0134, Ta- not purge
ble 7) old lubricant
out of com-
ponent.

0132-14
 TM 9-2320-341-10 0132

Table 1. PMCS- SEMIANNUAL - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

LUBE
FITTINGS

ROLLER
ASSEMBLY

Figure 11.

2.

NOTE
Pintle hook plate lubrication
fitting can be on any side.

9 Semian- Pintle 1. Lubricate pintle hook (3 fittings) Fitting will

nual Hook with GAA. (WP 0134, Table 9) not purge
old lubricant
out of com-
ponent.

0132-15
 TM 9-2320-341-10 0132

Table 1. PMCS- SEMIANNUAL - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

Figure 12.

END OF WORK PACKAGE

0132-16
 TM 9-2320-341-10 0133

OPERATOR MAINTENANCE
MONTHLY - PREVENTIVE MAINTENANCE

INITIAL SETUP:

Tools and Special Tools

Gloves, Welders

Table 1. PMCS - MONTHLY

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

WARNING

Do not start engine or move

vehicle when personnel are
under vehicle or working on
brake lines. Failure to comply
may result in injury or death to
personnel.
WARNING

Ensure engine is OFF and

eye protection is worn when
checking for leaks. Failure to
comply may result in injury or
death to personnel.

0133-1
 TM 9-2320-341-10 0133

Table 1. PMCS - MONTHLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

NOTE
• Lubrication intervals are
for normal operating
conditions. Intervals may
be shortened as required
for severe operating
conditions.
• Clean all lubrication
points with cleaning
compound, solvent and
allow to dry prior to
servicing.
• When using a grease
gun, apply lubricant to the
fitting until clean lubricant
squeezes out of the part
being lubricated.
• Always refer to lubrication
instructions (WP 0134) to
ensure equipment has
correct lubricants
appropriate to operating
environment (expected
continuous
temperatures). If not,
remove/drain and
reapply/refill equipment
with appropriate
lubricants for operating
environment as
prescribed in lubrication
instructions. (WP 0134)
1 Monthly Damage Check entire vehicle for obvious Any broken,
And Cor- damage and/or corrosion. cracked,
bent frame

0133-2
 TM 9-2320-341-10 0133

Table 1. PMCS - MONTHLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

rosion rails, cross-

Check members,
or screws
are found.

2 Monthly Lubricate 1. Lubricate cabin door latching

Oilcan mechanisms and hinges with
Points OE/HDO. (WP 0134)

2. Lubricate all side panel and en-

gine cover hinges, locks, and
latches with OE/HDO. (WP
0134)

NOTE
Steady illumination of the arc-
tic engine heater indicator
light indicates proper opera-
tion.

3 Monthly Arctic En- 1. Position arctic engine heater ON/

gine OFF switch to ON position, indi-
Heater cator light will illuminate.

0133-3
 TM 9-2320-341-10 0133

Table 1. PMCS - MONTHLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

INTER-
AXLE
8X8

B.O.
LIGHTS
B.O.
EXHAUST
SELECT

INDICATOR
LER LY
PULL TO

TRAI SUPPKING
AINOTR FORMIDPARLAND
SUPPLY

P U SH T O

LIGHT

AlTranlissmisonsion

ARCTIC
HEATER
ON/OFF
SWITCH
er
at
Prehe
e
Engin

Figure 1.

2. Visually check all fuel lines for Any Class

leaks, cuts, loose clamps, and III leak.
other obvious damage.

0133-4
 TM 9-2320-341-10 0133

Table 1. PMCS - MONTHLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

ARCTIC
ENGINE
HEATER
CLAMP

INTAKE EXHAUST
PORT PIPE
FUEL PICK
UP PIPE
FUEL
LINE
HOSE
CLAMPS

FUEL
METERING
PUMP

CLAMP

Figure 2.

3. Visually check intake port and ex-

haust pipe for blockage.

4. Check water pump for unusual

noise.

0133-5
 TM 9-2320-341-10 0133

Table 1. PMCS - MONTHLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

HOSE

ARCTIC ENGINE CLAMP

HEATER

HOSE

CLAMP

WATER PUMP

Figure 3.

5. Check coolant hoses at arctic en- Any Class

gine heater for leaks, cuts, loose III leak.
hose clamps, and other obvious
damage.

6. Check coolant hoses and fittings Any Class

on engine for leaks, cuts, loose III leak.
hose clamps, and other obvious
damage.

0133-6
 TM 9-2320-341-10 0133

Table 1. PMCS - MONTHLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

ARTIC ENGINE
HEATER COOLANT
FITTINGS

Figure 4.

7. Run arctic engine heater for a

minimum of 15 minutes at least
once a month.

NOTE
Gas particulate filter unit must
be in operation to perform the
following checks.

4 Monthly Gas Par- 1. Check heater for unusual loud Heater does
ticulate noise or improper operation. not operate/
Filter Unit operates
(GPFU) abnormally
and GPFU
is required
for mission.

0133-7
 TM 9-2320-341-10 0133

Table 1. PMCS - MONTHLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

HOSE CLAMP

HOSE
CLAMP HOSES

Figure 5.

2. Disconnect two air duct break- No airflow

away sockets from mount and or not
feel for airflow. enough air-
flow and
GPFU is re-
quired for
mission.

3. Turn heater control knob clock- Heater is in-

wise to make sure indicator light operative
illuminates. and GPFU
is required
for mission.

4. Check hoses for cuts, tears, and Hoses cut,

other obvious damage. torn, or
damaged
and GPFU

0133-8
 TM 9-2320-341-10 0133

Table 1. PMCS - MONTHLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

is required
for mission.

5. Make sure hose clamps are se- Clamps

cure. loose and
GPFU is re-
quired for
mission.

5 Monthly Rifle 1. Check that mounting screws on

Stowage top mount and lower mount are
Mount not broken or missing.

TOP
MOUNT

HANDLE

LOWER
MOUNT

Figure 6.

2. Check handle for excessive

looseness or binding.

0133-9
 TM 9-2320-341-10 0133

Table 1. PMCS - MONTHLY - Continued

Item to
be
Checked Equipment
Item or Not Ready/
No. Interval Serviced Procedure Available If:

6 Monthly Machine Check machine gun operator's plat-

Gun Op- form support for loose, broken, or
erator's missing mounting screws.
Platform
Support

7 Monthly Machine Check machine gun operator's plat-

Gun Op- form for cracks, loose or broken leg,
erator's missing or broken tie down strap.
Platform

8 Monthly Ring Check machine gun mounts for

Mount loose, broken, or missing mounting
screws.

9 Monthly M-13 De- Refer to TM 3-4230-214-12&P (WP

contami- 0146) for M-13 Decontamination Unit
nation PMCS.
Unit

10 Monthly M-8 Refer to TM 3-6665-225-12 (WP

Chemical 0146) for M-8 Chemical Alarm
Alarm PMCS.

11 Monthly Radio Refer to TM 11-5820-498-12 (WP

0146) for radio PMCS.

END OF WORK PACKAGE

0133-10
TM 9-2320-341-10

CHAPTER 5

MAINTENANCE
INSTRUCTIONS
 TM 9-2320-341-10 0134

OPERATOR MAINTENANCE
LUBRICATION INSTRUCTIONS

INITIAL SETUP:

Not Applicable

WARNING

Adhesives, solvents, and sealing compounds can burn easily, can give
off harmful vapors, and are harmful to skin and clothing. Keep away from
open fire and use in well-ventilated area. If adhesive, solvent, or sealing
compound gets on skin or clothing, wash immediately with soap and wa-
ter. Failure to comply may result in injury or death to personnel.

NOTE
• The lowest level of maintenance authorized to lubricate a specific
point is indicated by where that lubrication point falls within the PMCS
tables. Operator/crew are only authorized to lubricate those points
within the operator PMCS tables. Field level maintenance personnel
are authorized to lubricate all points regardless of which tables
(operator or field level) those lubrication points are listed.
• Refer to PMCS tables for specific lubrication points and localized
views.
• Lubrication intervals are for normal operating conditions. Intervals
may be shortened as required for severe operating conditions.
• Clean all lubrication points with cleaning compound, solvent and
allow to dry prior to servicing.
• When using a grease gun, apply lubricant to the fitting until clean
lubricant squeezes out of the part being lubricated.
• After a thorough high pressure washing, lubricate all grease fittings
and oil can points outside and underneath vehicle.

0134-1
 TM 9-2320-341-10 0134

• If vehicle fords water obstacle, service all lubrication points below

fording depth and check submerged gearboxes for presence of
water.
• Ensure equipment has correct lubricants appropriate to operating
environment (expected continuous temperatures). If not, remove/
drain and reapply/refill equipment with appropriate lubricants for
operating environment as prescribed in these lubrication instructions.

Table 1. Engine Lubrication.

Expected Expected
Expected
Temperat Temperat
Temperat
ures ures Desert
Capacitie ures
Item +40 to -15° +40 to -50° Condition Interval
s Above
F F s
+15°F (-9°
(+4 to -26° (+4 to -46°
C)
C) C)

Engine Oil 42 qt. OE/ OE/ OE/ OE/ A-Annual

(with filter (39.73 L) HDO-15W HDO-15W/ HDO-15W/ HDO-40 (1 year)
change) /40 40 40 MIL-
MIL- MIL- MIL- PRF-2104
PRF-2104 PRF-2104 PRF-2104
or or
OEA OEA
MIL- MIL-
PRF-4616 PRF-4616
7 7
(Notes 1 (Notes 1
and 2) and 2)

Engine Oil 40 qt. OE/ OE/ OE/ OE/ A-Annual

(without fil- (37.84 L) HDO-15W HDO-15W/ HDO-15W/ HDO-40 (1 year)
ter /40 40 40 MIL-
change) MIL- MIL- MIL- PRF-2104
PRF-2104 PRF-2104 PRF-2104
or or
OEA OEA
MIL- MIL-
PRF-4616 PRF-4616
7 7
(Notes 1 (Notes 1
and 2) and 2)

0134-2
 TM 9-2320-341-10 0134

Table 1. Engine Lubrication. - Continued

Expected Expected
Expected
Temperat Temperat
Temperat
ures ures Desert
Capacitie ures
Item +40 to -15° +40 to -50° Condition Interval
s Above
F F s
+15°F (-9°
(+4 to -26° (+4 to -46°
C)
C) C)

NOTE
1. OEA must be used when temperatures are consistently below 0°F (-18°C).
2. OE/HDO-15W/40 must be used when temperatures are consistently above 0°F
(-18°C).

Table 2. Transmission and Transfer Case Lubrication.

Expected
Expected Expected
Temperatur
Temperatur Temperatur
es
Item Capacities es es Interval
+40 to -50°F
Above +15° +40 to -15°F
(+4 to -46°
F (-9°C) (+4 to -26°C )
C)

Transmis- 40 qt. (37.84 OE/ OE/ OE/ A-Annual

sion Oil L) HDO-15W/ HDO-15W/ HDO-15W/ (1 year)
(with filter 40 40 40
change) MIL- MIL- MIL-
PRF-2104 PRF-2104 PRF-2104
(Note 2) (Note 2)

Transmis- 39 qt. (36.89 OE/ OE/ OE/ A-Annual

sion Oil L) HDO-15W/ HDO-15W/ HDO-15W/ (1 year)
(without filter 40 40 40
change) MIL- MIL- MIL-
PRF-2104 PRF-2104 PRF-2104
(Note 2) (Note 2)

Transfer 6.5 qt. (6.15 OE/ OE/ OE/ A-Annual

Case L) HDO-15W/ HDO-15W/ HDO-15W/ (1 year)
40 40 40
MIL- MIL- MIL-
PRF-2104 PRF-2104 PRF-2104
or or

0134-3
 TM 9-2320-341-10 0134

Table 2. Transmission and Transfer Case Lubrication. - Continued

Expected
Expected Expected
Temperatur
Temperatur Temperatur
es
Item Capacities es es Interval
+40 to -50°F
Above +15° +40 to -15°F
(+4 to -46°
F (-9°C) (+4 to -26°C )
C)
OEA OEA
MIL- MIL-
PRF-46167 PRF-46167
(Notes 1 and (Notes 1 and
2) 2)

All Other As Required GAA GAA GAA As Required

Transmis- MIL- MIL- MIL- (Note 3)
sion PRF-10924 PRF-10924 PRF-10924
and Transfer (Note 2) (Note 2)
Case
Lubrication
Points

NOTE
1. OE/HDO-15W/40 must be used when temperatures are consistently above 0°F
(-18°C).
2. Refer to FM 9-207 (WP 0146) for arctic operation.
3. Refer to PMCS tables for specific lubrication intervals.

Table 3. Axle Lubrication.

Expected Expected
Expected
Temperatur Temperatur
Temperatur
es es
Item Capacities es Interval
+40 to -15°F +40 to -50°F
Above +15°
(+4 to -26° (+4 to -46°
F (-9°C)
C) C)

Axle 1 17.5 qt. GO-85W/ GO-85W/ GO-80W/90 B-Bienniel

(16.56 L) 140 140 MIL- (2 Years)
MIL- MIL- PRF-2105 (Note 4)
PRF-2105 PRF-2105 or
or GO-75
GO-80W/90

0134-4
 TM 9-2320-341-10 0134

Table 3. Axle Lubrication. - Continued

Expected Expected
Expected
Temperatur Temperatur
Temperatur
es es
Item Capacities es Interval
+40 to -15°F +40 to -50°F
Above +15°
(+4 to -26° (+4 to -46°
F (-9°C)
C) C)
MIL- MIL-
PRF-2105 PRF-2105
(Notes 1 and (Notes 2 and
3) 3)

Axle 2 21.5 qt. GO-85W/ GO-85W/ GO-80W/90 B-Bienniel

(and Power (20.34 L) 140 140 MIL- (2 Years)
Divider) MIL- MIL- PRF-2105 (Note 4)
PRF-2105 PRF-2105 or
or GO-75
GO-80W/90 MIL-
MIL- PRF-2105
PRF-2105 (Notes 2 and
(Notes 1 and 3)
3)

Axle 3 21.5 qt. GO-85W/ GO-85W/ GO-80W/90 B-Bienniel

(and Power (20.34 L) 140 140 MIL- (2 Years)
Divider) MIL- MIL- PRF-2105 (Note 4)
PRF-2105 PRF-2105 or
or GO-75
GO-80W/90 MIL-
MIL- PRF-2105
PRF-2105 (Notes 2 and
(Notes 1 and 3)
3)

Axle 4 22 qt. (20.81 GO-85W/ GO-85W/ GO-80W/90 B-Bienniel

L) 140 140 MIL- (2 Years)
MIL- MIL- PRF-2105 (Note 4)
PRF-2105 PRF-2105 or
or GO-75
GO-80W/90 MIL-
MIL- PRF-2105
PRF-2105 (Notes 2 and
(Notes 1 and 3)
3)

0134-5
 TM 9-2320-341-10 0134

Table 3. Axle Lubrication. - Continued

Expected Expected
Expected
Temperatur Temperatur
Temperatur
es es
Item Capacities es Interval
+40 to -15°F +40 to -50°F
Above +15°
(+4 to -26° (+4 to -46°
F (-9°C)
C) C)

Axle 4 18 qt. (17.03 GO-85W/ GO-85W/ GO-80W/90 B-Bienniel

L) 140 140 MIL- (2 Years)
MIL- MIL- PRF-2105 (Note 4)
PRF-2105 PRF-2105 or
or GO-75
GO-80W/90 MIL-
MIL- PRF-2105
PRF-2105 (Notes 2 and
(Notes 1 and 3)
3)

Oil Lubed N/A GO-85W/ GO-85W/ GO-80W/90 B-Bienniel

Wheel 140 140 MIL- (2 Years)
Bearings MIL- MIL- PRF-2105
PRF-2105 PRF-2105 or
or GO-75
GO-80W/90 MIL-
MIL- PRF-2105
PRF-2105 (Notes 2 and
(Notes 1 and 3)
3)

All Other As Required GAA GAA GAA As Required

Axle MIL- MIL- MIL- (Note 5)
Lubrication PRF-10924 PRF-10924 PRF-10924
Points (Note 3) (Note 3)

NOTE
1. GO-85W/140 must be used when temperatures are consistently above 30°F (-1°
C).
2. GO-85W/90 must be used when temperatures are consistently above -15°F (-26°
C).
3. Refer to FM 9-207 (WP 0146) for arctic operation.
4. An initial lubrication change on new or rebuilt axles should occur between 500
mi. (805 km) and 1,000 miles (1 609 km). Refer to Field Level Annual PMCS for
more information.

0134-6
 TM 9-2320-341-10 0134

Table 3. Axle Lubrication. - Continued

Expected Expected
Expected
Temperatur Temperatur
Temperatur
es es
Item Capacities es Interval
+40 to -15°F +40 to -50°F
Above +15°
(+4 to -26° (+4 to -46°
F (-9°C)
C) C)
5. Refer to PMCS tables for specific lubrication intervals.

Table 4. Hydraulic Reservoir Servicing.

Expected Expected
Expected
Temperatur Temperatur
Temperatur
es es
Item Capacities es Interval
+40 to -15°F +40 to -50°F
Above +15°
(+4 to -26° (+4 to -46°
F (-9°C)
C) C)

Hydraulic 151 qt. OE/HDO-10 OE/HDO-10 OEA A-Annual

Reservoir (142.85 L) MIL- MIL- MIL- (1 year)
PRF-2104 PRF-2104 PRF-46167
or (Note 2) (Notes 2 and
OE/HDO-30 3)
MIL-
PRF-2104
(Note 1)

NOTE
1. OE/HDO-30 must be used only when temperatures are consistently above 60°F
(16°C).
2. Refer to FM 9-207 (WP 0146) for arctic operation.
3. OEA must be used when temperatures are consistently below 0°F (-18°C).

0134-7
 TM 9-2320-341-10 0134

Table 5. Radiator Servicing.

Expected Expected
Expected
Temperatur Temperatur
Temperatur
es es
Item Capacities es Interval
+40 to -15°F +40 to -50°F
Above +15°
(+4 to -26° (+4 to -46°
F (-9°C)
C) C)

Antifreeze 58.5 qt. 58.5 qt. 58.5 qt. 58.5 qt. A-Annual
(CID A- (55.34 L) (55.34 L) (55.34 L) (55.34 L) (1 year)
A-52624) 50% Ethyl- 50% Ethyl- 60% Ethyl- (Note 4)
(Note 1) ene Glycol ene Glycol ene Glycol
Type IC (Re- Type IC (Re- Arctic Type
cycled) cycled) IB (Recy-
(Notes 1 and (Notes 1 and cled)
2) 2) (Notes 1, 2,
and 3)

Antifreeze 58.5 qt. 29.5 qt. 29.5 qt. 35.1 qt. (33.2 A-Annual
(CID A- (55.34 L) (27.91 L) (27.91 L) L) (1 year)
A-52624) 100% Ethyl- 100% Ethyl- 100% Ethyl- (Note 4)
(Note 1) ene Glycol ene Glycol ene Glycol
Type IA (Re- Type IA (Re- Type IA (Re-
cycled) cycled) cycled)
plus plus plus
29 qt. (27.43 29 qt. (27.43 23.4 qt.
L) water L) water (22.14 L) wa-
(Notes 1 and (Notes 1 and ter
5) 5) (Notes 1, 3,
and 6)

Antifreeze 58.5 qt. 29.5 qt. 29.5 qt. 35.1 qt. (33.2 A-Annual
(CID A- (55.34 L) (27.91 L) (27.91 L) L) (1 year)
A-52624) 100% 100% Propy- 100% Propy- (Note 4)
(Note 1) 100% Propy- lene Glycol lene Glycol
lene Glycol Type IIA (vir- Type IIA (vir-
Type IIA (vir- gin) gin)
gin) plus plus
plus 29 qt. (27.43 23.4 qt.
29 qt. (27.43 L) water (22.14 L) wa-
L) water (Notes 1 and ter
(Notes 1 and 7) (Notes 1, 3,
7) and 8)

0134-8
 TM 9-2320-341-10 0134

Table 5. Radiator Servicing. - Continued

Expected Expected
Expected
Temperatur Temperatur
Temperatur
es es
Item Capacities es Interval
+40 to -15°F +40 to -50°F
Above +15°
(+4 to -26° (+4 to -46°
F (-9°C)
C) C)

Corrosion In- 1.8 qt. (1.7 L) (Note 1) (Note 1) (Notes 1 and As Required
hibitor 3)
(Note 1)

NOTE
1. Refer to TB 750-651 (WP 0146) for more information on antifreeze and additives
used in the HEMTT series vehicle engine cooling system, and TM 750-254 (WP
0146) for detailed instructions for draining, cleaning, and flushing cooling systems
of tactical vehicles.
2. Type 1C (normal) and Type 1B (arctic) antifreeze is premixed, and DOES NOT
REQUIRE the addition of water. Never add water or inhibitor to Type IB anti-
freeze.
3. Refer to FM 9-207 (WP 0146) for arctic operation.
4. Engine coolant contaminant level is checked annually. Engine coolant does not
need to be changed until it fails check.
5. A mixture of 50% Ethylene Glycol (EG) antifreeze to 50% water will provide freeze
protection down to -34°F (-37°C).
6. A mixture of 50% Propylene Glycol (PG) antifreeze to 50% water will provide
freeze protection down to -27°F (-33°C).
7. A mixture of 60% Ethylene Glycol (EG) antifreeze to 40% water will provide freeze
protection down to -62°F (-52°C).
8. A mixture of 60% Propylene Glycol (PG) antifreeze to 40% water will provide
freeze protection down to -56°F (-49°C).

0134-9
 TM 9-2320-341-10 0134

Table 6. Tire Carrier Lubrication.

Expected Expected
Expected
Temperatur Temperatur
Temperatur
es es
Item Capacities es Interval
+40 to -15°F +40 to -50°F
Above +15°
(+4 to -26° (+4 to -46°
F (-9°C)
C) C)

Tire Carrier 1.5 qt. (1.42 OE/HDO-10 OE/HDO-10 OEA S-Semian-

Pump L) MIL- MIL- MIL- nual (WP
(Note 1) PRF-2104 PRF-2104 PRF-46167 0132)
(Note 2) (Note 2) (6 Months)
(Note 3)

NOTE
1. Refer to tire carrier hydraulic system fill for information on servicing tire carrier
pump.
2. Refer to FM 9-207 (WP 0146) for arctic operation.
3. Check level and add fluid as necessary. Currently there is no requirement to
drain/fill tire carrier pump reservoir.

Table 7. Heavy-Duty Winch Lubrication.

Expected Expected
Expected
Temperatur Temperatur
Temperatur
es es
Item Capacities es Interval
+40 to -15°F +40 to -50°F
Above +15°
(+4 to -26° (+4 to -46°
F (-9°C)
C) C)

Winch Gear- 2 qt. (1.89 L) GO-85W/ GO-75 GO-75 A-Annual

box 140 MIL- MIL- (1 year)
(Motor End) MIL- PRF-2105 PRF-2105
PRF-2105 or (Note 1)
GO-80W/90
MIL-
PRF-2105
(Note 1)

Winch Gear- 3.5 qt. (3.31 GO-85W/ GO-75 GO-75 A-Annual

box L) 140 MIL- MIL- (1 year)
(Gear End) PRF-2105 PRF-2105

0134-10
 TM 9-2320-341-10 0134

Table 7. Heavy-Duty Winch Lubrication. - Continued

Expected Expected
Expected
Temperatur Temperatur
Temperatur
es es
Item Capacities es Interval
+40 to -15°F +40 to -50°F
Above +15°
(+4 to -26° (+4 to -46°
F (-9°C)
C) C)
MIL- or (Note 1)
PRF-2105 GO-80W/90
MIL-
PRF-2105
(Note 1)

Winch Cable As Required OE/HDO-30 OE/HDO-10 OEA S-Semian-

MIL- MIL- MIL- nual (WP
PRF-2104 PRF-2104 PRF-46167 0132)
(Note 1) (Note 1) (6 Months)

All Other As Required GAA GAA GAA As Required

Winch MIL- MIL- MIL- (Note 2)
Lubrication PRF-10924 PRF-10924 PRF-10924
Points (Note 1) (Note 1)

NOTE
1. Refer to FM 9-207 (WP 0146) for arctic operation.
2. Refer to PMCS tables for specific lubrication intervals.

Table 8. Oil Can Point Lubrication.

Expected Expected Expected

Temperatures Temperatures Temperatures
Capacities Intervals
Above +15°F +40 to -15°F +40 to -50°F
(-9°C) (+4 to -26°C ) (+4 to -46°C )

As Required OE/HDO-30 OE/HDO-10 OEA As Required

MIL-PRF-2104 MIL-PRF-2104 MIL-PRF-46167 (Note 2)
(Note 1) (Note 1)

NOTE
1. Refer to FM 9-207 (WP 0146) for arctic operation.

0134-11
 TM 9-2320-341-10 0134

Table 8. Oil Can Point Lubrication. - Continued

Expected Expected Expected

Temperatures Temperatures Temperatures
Capacities Intervals
Above +15°F +40 to -15°F +40 to -50°F
(-9°C) (+4 to -26°C ) (+4 to -46°C )
2. Refer to PMCS tables for specific oilcan lubrication intervals.

Table 9. Miscellaneous Lubrication Points.

Expected
Expected Expected
Temperatur
Temperatur Temperatur
es
Item Capacities es es Interval
+40 to -15°F
Above +15° +40 to -50°F
(+4 to -26°
F (-9°C) (+4 to -46°C )
C)

Brake Cam As Required GAA GAA GAA S-Semian-

Slack Ad- MIL- MIL- MIL- nual (WP
justers PRF-10924 PRF-10924 PRF-10924 0132)
(Note 1) (Note 1) (6 Months)

Fifth Wheel As Required GAA GAA GAA W-Weekly

Plate MIL- MIL- MIL- (WP 0131)
PRF-10924 PRF-10924 PRF-10924
(Note 1) (Note 1)

Fifth Wheel As Required GAA GAA GAA W-Weekly

Ramp MIL- MIL- MIL- (WP 0131)
PRF-10924 PRF-10924 PRF-10924
(Note 1) (Note 1)

Pintle Hook As Required GAA GAA GAA W-Weekly

MIL- MIL- MIL- (WP 0131)
PRF-10924 PRF-10924 PRF-10924 S-Semian-
(Note 1) (Note 1) nual (WP
0132)
(6 Months)
(service fit-
tings)

Propeller As Required GAA GAA GAA S-Semian-

Driver MIL- MIL- MIL- nual (WP
Shafts PRF-10924 PRF-10924 PRF-10924 0132)
(6 Months)

0134-12
 TM 9-2320-341-10 0134

Table 9. Miscellaneous Lubrication Points. - Continued

Expected
Expected Expected
Temperatur
Temperatur Temperatur
es
Item Capacities es es Interval
+40 to -15°F
Above +15° +40 to -50°F
(+4 to -26°
F (-9°C) (+4 to -46°C )
C)
and U-Joints (Note 1) (Note 1) (Note 2)

Steering As Required GAA GAA GAA S-Semian-

System MIL- MIL- MIL- nual (WP
PRF-10924 PRF-10924 PRF-10924 0132)
(Note 1) (Note 1) (6 Months)

NOTE
1. Refer to FM 9-207 (WP 0146) for arctic operation.
2. When vehicle is operating under severe conditions, lubricate propeller shafts and
universal joints every 50 hours of vehicle operation.
3. Refer to PMCS tables for specific lubrication intervals.

Table 10. Vehicle Cleaning.

Expected
Item Capacities Intervals
Temperature

Cleaning Com- As Required SD All Tempera- As Required

pound, Solvent tures
(Note 1) (Note 2)

NOTE
1. After a thorough high pressure washing, lubricate all grease fittings and oil can
points outside and underneath vehicle.
2. Refer to FM 9-207 (WP 0146) for arctic operation.

END OF WORK PACKAGE

0134-13
 TM 9-2320-341-10 0135

OPERATOR MAINTENANCE
CLOSE/OPEN HEATER VALVES

INITIAL SETUP:

Equipment Condition Wheels chocked. (WP 0072)

Engine OFF. (WP 0057) Open passenger side engine cover.
(WP 0143)

CLOSE HEATER VALVES

NOTE
• Closing two heater valves will improve the efficiency of the cabin air
conditioning.
• Closing two heater valves will disable cabin heat.
• Heater valve knob is located on rear passenger side of engine.
1. Turn heater valve knob (1) counterclockwise to close.

Figure 1.

NOTE
Heater valve knob is located towards bottom of front passenger side of
engine.

0135-1
 TM 9-2320-341-10 0135

2. Turn heater valve knob (2) counterclockwise to close.

Figure 2.

END OF TASK

OPEN HEATER VALVES

NOTE
• Opening two heater valves will diminish efficiency of air conditioning
kit.
• Opening two heater valves will enable cabin heat.
• Heater valve knob is located on rear passenger side of engine.
1. Turn heater valve knob (1) clockwise to close.

0135-2
 TM 9-2320-341-10 0135

Figure 3.

NOTE
Heater valve knob is located towards bottom of front passenger side of
engine.
2. Turn heater valve knob (2) clockwise to close.

Figure 4.

END OF TASK

0135-3
 TM 9-2320-341-10 0135

FOLLOW-ON MAINTENANCE

1. Close passenger side engine cover. (WP 0143)

2. Remove wheel chocks.

END OF WORK PACKAGE

0135-4
 TM 9-2320-341-10 0136

OPERATOR MAINTENANCE
PRE/POST TOWING PROCEDURE (FRONT LIFT ONLY)

INITIAL SETUP:

Tools and Special Tools Equipment Condition

Chain, 8 ft. (supplied by wrecker) Engine OFF. (WP 0057)
Chain, 7 ft. (supplied by wrecker) (WP
0147, Table 3, Item 3)

PREPARE VEHICLE FOR TOWING

CAUTION
When installing axle restraint chains, route chains so hoses or lines are
not between frame and chain or axle and chain. Failure to comply may
result in damage to equipment.

NOTE
• This procedure is applicable to preparation for towing a HEMTT
series vehicle from the front ONLY (refer to tow HEMTT-front lift for
further information).
• If disabled vehicle is either a BASE or A2 model HEMTT series
vehicle (refer to data plate on inside of driver side door), complete
Step (1).
• If disabled vehicle is an A4 model HEMTT series vehicle (refer to data
plate on inside of driver side door), skip to Step (2).
1. Perform the following on disabled vehicle:
a. Remove propeller shaft between transfer case and No. 3 axle.
b. Install axle restraint chains (1):

0136-1
 TM 9-2320-341-10 0136

2 1 3

Figure 1.

NOTE
• Axle restraint chains are installed the same way, driver side
shown.
• No. 2 axle should be restrained with chains on both sides of
vehicle.
(1) Route axle restraint chain (1) over frame rail (2) and around axle (3) beside
walking beam (4).
(2) Hook axle restraint chain (1) back into itself.
(3) Repeat Steps (1) and (2) for opposite side of No. 2 axle (3).

CAUTION
When installing axle restraint chains, route chain around frame rail and
axle only. Do not wrap chain around lateral torque rod, shock absorber,
shift cables, etc. as they could be crushed. Route chains so hoses or lines
are not between frame and chain or axle and chain. Failure to comply
may result in damage to equipment.

NOTE
• This procedure is applicable to preparation for towing a HEMTT
series vehicle from the front ONLY (refer to tow HEMTT-front lift for
further information).
• If disabled vehicle is an A4 model HEMTT series vehicle (refer to data
plate on inside of driver side door), complete Step (2).
2. Perform the following on disabled vehicle:

0136-2
 TM 9-2320-341-10 0136

a. Remove propeller shaft between transfer case and No. 3 axle.

b. Install axle restraint chains (1):

Figure 2.

NOTE
• Axle restraint chains are installed the same way, driver side
shown.
• No. 2 axle should be restrained with chains on both sides of
vehicle.
(1) Route axle restraint chain (1) under engine shroud (2), over frame rail (3), and
around axle (4).
(2) Hook axle restraint chain (1) back into itself as shown.
(3) Repeat Steps (1) and (2) for opposite side of No. 2 axle (3).

END OF TASK

0136-3
 TM 9-2320-341-10 0136

POST TOWING PROCEDURE

NOTE
• This post towing procedure is applicable to a HEMTT series vehicle
that has been towed from the front ONLY (refer to tow HEMTT-front
lift for further information).
• If disabled vehicle is either a BASE or A2 model HEMTT series
vehicle (refer to data plate on inside of driver side door), complete
Step (1).
• If disabled vehicle is an A4 model HEMTT series vehicle (refer to data
plate on inside of driver side door), skip to Step (2).
1. Perform the following to disabled vehicle:
a. Remove two axle restraint chains (1) from around frame rails (2) and No. 2 axle (3).

3 1

Figure 3.
b. Return two axle restraint chains (1) to wrecker stowage.
c. Install propeller shaft between transfer case and No. 3 axle.

NOTE
• This post towing procedure is applicable to a HEMTT series vehicle
that has been towed from the front ONLY (refer to tow HEMTT-front
lift for further information).
• If disabled vehicle is an A4 model HEMTT series vehicle (refer to data
plate on inside of driver side door), complete Step (2).
2. Perform the following to disabled vehicle:
a. Remove two axle restraint chains (1) from under engine shroud (2), around frame
rail (3), and No. 2 axle (4).

0136-4
 TM 9-2320-341-10 0136

Figure 4.
b. Return two axle restraint chains (1) to wrecker stowage.
c. Install propeller shaft between transfer case and No. 3 axle.

END OF TASK

END OF WORK PACKAGE

0136-5
 TM 9-2320-341-10 0137

OPERATOR MAINTENANCE
CLEAN VEHICLE

INITIAL SETUP:

Materials/Parts Equipment Condition

Rag, Wiping (WP 0149, Table 1, Item Engine OFF. (WP 0057)
50) Wheels chocked. (WP 0072)

CLEAN EXTERIOR

CAUTION
Do not wipe dirt off vehicle when vehicle is dry. Dirt, stones, or debris may
scratch and damage vehicle.

NOTE
After a thorough high pressure washing, lubricate all grease fittings and
oil can points outside and underneath vehicle (refer to lubrication instruc-
tions (WP 0134) for more information).
1. Wash vehicle often with cool or warm water. Do not use strong detergent or abrasives.

Figure 1.
2. While cleaning vehicle, look closely for rust, corrosion, bare metal, or other damage.
Report any damage to Field Level Maintenance.

END OF TASK

CLEAN INTERIOR

1. Remove loose dirt and dust from cab interior components (1).

0137-1
 TM 9-2320-341-10 0137

3
2

Figure 2.
2. Clean seat cushions (2) and seatbelts (3) with warm soapy water. Do not use abrasives
or solvents.
3. Wipe seat cushions (2) and seatbelts (3) dry.

END OF TASK

END OF WORK PACKAGE

0137-2
 TM 9-2320-341-10 0138

OPERATOR MAINTENANCE
CHANGE WHEEL AND TIRE ASSEMBLY

INITIAL SETUP:

Tools and Special Tools Warning Device Set, Triangular (WP

Chocks, Wheel (4) (WP 0147, Table 3, 0147, Table 3, Item 19)
Item 5) Wrench, Wheel Lugnut (WP 0147,
Extension, Handle (WP 0147, Table 3, Table 3, Item 27)
Item 9) Wrench, Adjustable (WP 0147, Table
Handle, Wrench (WP 0147, Table 3, 3, Item 25)
Item 11)
Jack, 12-ton, With Handle (WP 0147,
Personnel Required
Table 3, Item 14)
Jack, Base Plate (WP 0147, Table 3, Motor Transport Operator MOS 88M
Item 17) (2)

PREPARE VEHICLE

1. Shut off engine. (WP 0057)

WARNING

Park vehicle in safe area, out of traffic, where there is no danger to per-
sonnel changing tire assembly. Park vehicle on hard level ground. Failure
to comply may result in injury or death to personnel.
2. Turn on emergency flashers. (WP 0071)
3. Set up emergency marker kit, as necessary. (WP 0097)

END OF TASK

REMOVE SPARE WHEEL AND TIRE ASSEMBLY FROM TIRE CARRIER

NOTE
• This procedure is a two soldier task.

0138-1
 TM 9-2320-341-10 0138

• This procedure is not applicable when removing wheel and tire

assembly for maintenance purposes and installing same wheel and
tire assembly on vehicle:
If wheel and tire assembly to be removed and reinstalled is on No. 1
or No. 2 axle, refer to remove wheel and tire assembly from No. 1 or
No. 2 axle.
If wheel and tire assembly to be removed and reinstalled is on No. 3
or No. 4 axle, refer to remove wheel and tire assembly from No. 3 or
No. 4 axle.
1. Lower tire carrier. (WP 0038)
2. With spare wheel and tire assembly resting on ground, remove four spare wheel and
tire assembly retention screws (1) from tire carrier mounting bracket (2).

Figure 1.

3. While assistant steadies spare wheel and tire assembly, lower tire carrier (WP 0038)
until completely clear of spare wheel and tire assembly.
4. With aid of an assistant, roll spare wheel and tire assembly to vehicle near flat wheel
and tire assembly, and lean spare wheel and tire assembly against vehicle.
5. Check spare wheel and tire assembly air pressure.
6. Service spare wheel and tire assembly as required. (WP 0141)

END OF TASK

0138-2
 TM 9-2320-341-10 0138

REMOVE WHEEL AND TIRE ASSEMBLY FROM NO. 1 OR NO. 2 AXLE

1. Service (inflate) vehicle air suspension to perform jacking procedure.

2. Turn No. 1 axle ball valves OFF to perform jacking procedure.

CAUTION
Jack placement is critical to avoid damaging vehicle suspension compo-
nents. Follow jack placement notes and procedures carefully. Failure to
comply may result in damage to equipment.

NOTE
• If wheel and tire assembly to be removed is on No. 3 or No. 4 axle,
refer to remove wheel and tire assembly from No. 3 or No. 4 axle.
• All wheel and tire assemblies on No. 1 and No. 2 axles are removed
the same. Passenger side No. 1 axle wheel and tire assembly shown.
• Jack ram should be fully screwed down (making jack as short as
possible) for Step (3).
3. Check if jack base plate (1) and jack (2) will fit under apex of equalizing beam (3):

3 2

Figure 2.

0138-3
 TM 9-2320-341-10 0138

3 3
FORWARD

Figure 3.

NOTE
Position jack 12 in. (30 cm) from end of equalizing beam. The jack
should be centered on apex as shown.
a. If jack base plate (1) and jack (2) fit under apex of equalizing beam (3), skip to Step
(5).
b. If jack base plate (1) and jack (2) DO NOT fit under apex of equalizing beam (3),
continue with Step (4).
4. Drive flat/shredded wheel and tire assembly onto two wheel chocks (4).

0138-4
 TM 9-2320-341-10 0138

Figure 4.

5. Install two wheel chocks (WP 0072) (4) in front of and behind tire across (on same axle)
from tire and wheel assembly which is being removed.

CAUTION
Jack placement is critical to avoid damaging vehicle suspension compo-
nents. Follow jack placement notes and procedures carefully. Failure to
comply may result in damage to equipment.

NOTE
• Jack ram should be fully screwed down (making jack as short as
possible) for Step (6).
• Center jack on apex, 12 in. (30 cm) from end of equalizing beam.
6. Position jack base plate (1) and jack (2) under apex of equalizing beam (3).

0138-5
 TM 9-2320-341-10 0138

Figure 5.

3 3
FORWARD

Figure 6.

NOTE
If possible, unscrew jack ram until it contacts jacking point on equalizing
beam prior to completing Step (7).
7. Raise jack (2) until firm contact is established with apex of equalizing beam (3).

NOTE
• Studs and lugnuts on driver side of vehicle have left-hand threads.
Rotate lugnuts clockwise to loosen, counterclockwise to tighten.
Studs and lugnuts on passenger side of vehicle have right-hand

0138-6
 TM 9-2320-341-10 0138

threads. Rotate lugnuts counterclockwise to loosen, clockwise to

tighten.
• Loosen lugnuts enough so they can be easily removed once weight
is off wheel and tire assembly, but do not remove them.
8. Assistant loosens 10 lugnuts (5) until they turn easily.

Figure 7.

NOTE
If wheel chocks were used under flat/shredded wheel and tire assembly
to aid in jack placement, wheel and tire assembly does not have to be
clear of wheel chocks.
9. Raise vehicle until wheel and tire assembly can be removed.
10. Assistant removes and sets 10 lugnuts (5) aside.

NOTE
If wheel chocks were used under flat/shredded wheel and tire assembly
to aid in jack placement, remove them and return to vehicle stowage.
11. Lower vehicle until wheel and tire assembly is just touching ground.
12. Raise vehicle slightly while assistant tilts top of wheel and tire assembly forward. Flat
wheel and tire assembly should move forward.
13. Repeat Steps (11) and (12) to walk wheel and tire assembly off axle studs (6).

0138-7
 TM 9-2320-341-10 0138

Figure 8.

14. With aid of an assistant, remove wheel and tire assembly and lean wheel and tire
assembly against vehicle.

END OF TASK

REMOVE WHEEL AND TIRE ASSEMBLY FROM NO. 3 OR NO. 4 AXLE

NOTE
• If wheel and tire assembly to be removed is on No. 1 or No. 2 axle,
refer to remove wheel and tire assembly from No. 1 or No. 2 axle.
• All wheel and tire assemblies on No. 3 and No. 4 axles are removed
the same. Passenger side No. 4 axle wheel and tire assembly shown.
• It may be necessary to drive flat/shredded wheel and tire assembly
onto two wheel chocks in order to fit jack base plate and jack under
transverse beam casting.
1. Service (inflate) vehicle air suspension needs to be serviced (inflated) to perform jacking
procedure.
2. Turn No. 4 axle ball valves OFF to perform jacking procedure.
3. Install two wheel chocks (WP 0072) in front of and behind tire across (on same axle)
from tire and wheel assembly which is being removed.

CAUTION
Jack placement is critical to avoid damaging vehicle suspension compo-
nents. Follow jack placement notes and procedures carefully. Failure to
comply may result in damage to equipment.

0138-8
 TM 9-2320-341-10 0138

NOTE
Position jack directly under flat spot in center of transverse beam casting.
4. Place jack base plate (1) and jack (2) under transverse beam casting (3):

Figure 9.

5. Unscrew jack ram (4) until it is at full extension or contacts transverse beam end casting
(3).
6. Raise jack (2) until firm contact is established with jacking point on transverse beam
end casting (3).

NOTE
• Studs and lugnuts on driver side of vehicle have left-hand threads.
Rotate lugnuts clockwise to loosen.
• Studs and lugnuts on passenger side of vehicle have right-hand
threads. Rotate lugnuts counterclockwise to loosen.
• Loosen lugnuts enough so they can be easily removed once weight
is off wheel and tire assembly, but do not remove them.
7. Assistant loosens 10 lugnuts (5) until they turn easily.

0138-9
 TM 9-2320-341-10 0138

Figure 10.

NOTE
If wheel chocks were used under flat/shredded wheel and tire assembly
to aid in jack placement, wheel and tire assembly does not have to be
clear of wheel chocks.
8. Raise vehicle until wheel and tire assembly can be removed.
9. Assistant removes and sets 10 lugnuts (5) aside.

NOTE
If wheel chocks were used under flat/shredded wheel and tire assembly
to aid in jack placement, remove them and return to vehicle stowage.
10. Lower vehicle until wheel and tire assembly is just touching ground.
11. Raise vehicle slightly while assistant tilts top of wheel and tire assembly forward. Tire
should move forward.
12. Repeat Steps (10) and (11) to walk wheel and tire assembly off studs (6).

0138-10
 TM 9-2320-341-10 0138

Figure 11.

13. With aid of an assistant, remove wheel and tire assembly and lean wheel and tire
assembly against vehicle.

END OF TASK

INSTALL WHEEL AND TIRE ASSEMBLY

NOTE
Tire tread is non-directional. Vehicle operation is not affected by direction
of traction bars.
1. With aid of an assistant, roll wheel and tire assembly (1) up to axle (2).

1
2

Figure 12.

0138-11
 TM 9-2320-341-10 0138

NOTE
Check that spare wheel and tire assembly wheel dish is in same position
as flat wheel and tire assembly wheel dish. Deep side of wheel dish will
face toward vehicle on four front wheels. Deep side of wheel dish will face
away from vehicle on four rear wheels except M984A4. All eight wheels
on M984A4 are installed with deep side of wheel dish facing toward ve-
hicle.
2. Make sure deep side of spare wheel and tire assembly wheel dish (3) is in same position
as flat/shredded wheel and tire assembly wheel dish when flat/shredded wheel and tire
assembly was removed.

NOTE
• Tire valve stem extension must be removed to reposition wheel and
tire assembly valve stem extension.
• It may be necessary to reposition valve stem to accomplish
installation of valve stem extension.
3. Make sure wheel and tire assembly valve stem (4) is pointing out, away from vehicle.

0138-12
 TM 9-2320-341-10 0138

SHALLOW DISH OUT

4

DEEP DISH OUT

Figure 13.

4. Line up holes in rim (5) of wheel and tire assembly (1) with studs (6) on axle (2).

2
5
1

Figure 14.

0138-13
 TM 9-2320-341-10 0138

WARNING

Wheel/tire assembly weighs 540 lbs (245 kg). Do not attempt to lift or
move wheel/tire assembly without the aid of an assistant and a lifting
device. Failure to comply may result in injury or death to personnel.
5. Lean top of wheel and tire assembly (1) against studs (6) and axle (2).

NOTE
Install a lugnut on top stud, and hand-tighten to hold wheel and tire as-
sembly in place.
6. Using handle extension (7), slide spare wheel and tire assembly onto studs (6) while
assistant raises vehicle with jack. Bottom of wheel and tire assembly (1) should swing
toward axle (2).
7. Assistant lowers vehicle until wheel and tire assembly (1) just touches ground.
8. Repeat Steps (5) through (7) until wheel and tire assembly (1) is seated on axle (2) and
studs (6).

NOTE
• Studs and lugnuts on driver side of vehicle have left-hand threads.
Rotate lugnuts counterclockwise to tighten.
• Studs and lugnuts on passenger side of vehicle have right-hand
threads. Rotate lugnuts clockwise to tighten.
9. Install and tighten 10 lugnuts (8) in order shown using wheel lugnut wrench.

0138-14
 TM 9-2320-341-10 0138

START
FINISH

Figure 15.

10. Assistant lowers jack (9) until vehicle weight is fully supported by suspension system.
11. Remove jack (9) and jack base plate (10) from under vehicle.

10

Figure 16.

12. Tighten 10 lugnuts (8) in order shown until they no longer tighten.

0138-15
 TM 9-2320-341-10 0138

START
FINISH

Figure 17.

13. Return all tools and equipment to proper stowage boxes.

14. Turn No. 1 or No. 4 axle ball valves ON (WP 0040) (as applicable).
15. Return vehicle to field level maintenance and have lugnuts (8) tightened to torque
requirements as soon as possible.

END OF TASK

STOW FLAT/SHREDDED WHEEL AND TIRE ASSEMBLY

1. With aid of an assistant, roll flat/shredded wheel and tire assembly into position in front
of wheel and tire assembly carrier.
2. While assistant maneuvers flat/shredded wheel and tire assembly, raise and lower
wheel and tire assembly carrier (WP 0038) until wheel and tire assembly carrier
mounting bracket tooth (1) catches rim (2) of spare wheel and tire assembly.

0138-16
 TM 9-2320-341-10 0138

1 2

Figure 18.

3. Raise tire carrier slightly so weight of flat wheel and tire assembly pulls itself closer to
tire carrier mounting bracket (3) and onto carrier mounting bracket alignment ridges (4).
4. Install and hand-tighten four spare wheel and tire assembly retention screws (5) into
holes provided in tire carrier mounting bracket (3).
5. Securely tighten four spare wheel and tire assembly retention screws (5).
6. Raise tire carrier.
7. Pick up and stow emergency marker kit (as necessary).

END OF TASK

END OF WORK PACKAGE

0138-17
 TM 9-2320-341-10 0139

OPERATOR MAINTENANCE
CLEAN FUEL TANK STRAINER

INITIAL SETUP:

Materials/Parts Equipment Condition

Rag, Wiping (WP 0149, Table 1, Item Engine OFF. (WP 0057)
50) Wheels chocked. (WP 0072)

REMOVE/CLEAN FUEL TANK STRAINER

WARNING

Fuel is very flammable and can explode easily. Keep fuel away from open
fire and keep fire extinguisher within easy reach when working with fuel.
Do not work on fuel system when engine is hot. Fuel can be ignited when
engine is hot. When working with fuel, post signs that read NO SMOKING
WITHIN 50 FEET OF VEHICLE. Failure to comply may result in injury or
death to personnel.
1. Wipe off dirt from fuel filler cap (1).

Figure 1.
2. Remove fuel filler cap (1).

0139-1
 TM 9-2320-341-10 0139

3. Pull strainer (2) out of fuel tank (3).

4. Clean strainer (2) with clean dry rag.

END OF TASK

INSTALL FUEL TANK STRAINER

1. Put strainer (2) in fuel tank (3).

Figure 2.
2. Install and tighten fuel filler cap (1).

END OF TASK

FOLLOW-ON MAINTENANCE

1. Remove wheel chocks.

END OF WORK PACKAGE

0139-2
 TM 9-2320-341-10 0140

OPERATOR MAINTENANCE
SERVICE AIR CLEANER ELEMENT

INITIAL SETUP:

Tools and Special Tools Equipment Condition

Ladder (WP 0147, Table 2, Item 2) Engine OFF. (WP 0057)
Wheels chocked. (WP 0072)
Materials/Parts
Rag, Wiping (WP 0149, Table 1, Item
50)

REMOVE AIR CLEANER ELEMENT

1. Unscrew four knobs (1) until retaining ring (2) is loose.

2 3

Figure 1.

2. Remove retaining ring (2) from canister (3).

3. Remove air cleaner element (4) from canister (3).

0140-1
 TM 9-2320-341-10 0140

4 3

Figure 2.

END OF TASK

CLEAN AIR CLEANER ELEMENT

NOTE
Notify field level maintenance if air cleaner element is damaged or cannot
be cleaned by tapping.
1. Tap side of air cleaner element (4) lightly against hand.

0140-2
 TM 9-2320-341-10 0140

Figure 3.

2. Dump out dirt and dust from primary element (4).

3. Wipe air cleaner element (4) with clean rag.

END OF TASK

INSTALL AIR CLEANER ELEMENT

1. Install air cleaner element (4) in canister (3).

0140-3
 TM 9-2320-341-10 0140

4 3

Figure 4.
2. Position retaining ring (2) over canister (3).

2 3

Figure 5.
3. Tighten four knobs (1) to secure retaining ring (2).
4. Start engine. (WP 0044)
5. Push button (5) to reset air cleaner restriction indicator (6). If indicator window (7) shows
VACUUM INCHES H20 below 20, continue with vehicle operation. If indicator window

0140-4
 TM 9-2320-341-10 0140

shows VACUUM INCHES H20 above 20, notify Field Level Maintenance as soon as
possible.

CHEM
ALARM
INTER
AXLE
25
22
15
6.2
5.5
3.7
7
11 2.7
8 2.0
8X8 IN H20 kPa

FILTER MINDER
AIR FILTER RESTRICTION
RESET

AUX HYD B.O B.O

ENABLE GPFU
HYD SELECT LIGHTS

PARKING
BRAKE

M 1
2 M

HIGH 0 TRAILER
1
IDLE 2 AIR SUPPLY

AIR BRAKE

5 6

Figure 6.
6. Shut OFF engine. (WP 0057)

END OF TASK

FOLLOW-ON MAINTENANCE

1. Remove wheel chocks.

END OF WORK PACKAGE

0140-5
 TM 9-2320-341-10 0141

OPERATOR MAINTENANCE
SERVICE TIRES

INITIAL SETUP:

Tools and Special Tools Gauge, Tire Pressure (WP 0147, Table
Gauge, Tire Pressure (WP 0147, Table 3, Item 13)
3, Item 8) Hose: Air, Pneumatic (WP 0147, Table
3, Item 12)

Equipment Condition
Engine OFF. (WP 0057)
Wheels chocked. (WP 0072)

CHECK TIRE PRESSURE

WARNING

Failure to comply with these procedures may result in faulty positioning

of the tire and/or rim parts and cause the assembly to burst with explosive
force. Never mount or use damaged tires or rims. Failure to comply may
result in injury or death to personnel.

NOTE
There are two types of air pressure gauges. One is a separate handheld
gauge. The other is a combined pressure gauge/inflation hose.
Both may be used to check air pressure in tire.
ALWAYS use combined pressure gauge/inflation hose to inflate tire.
1. Check tire air pressure with tire pressure gauge.
2. Ensure tires have correct air pressure for road conditions and driving speed .

END OF TASK

0141-1
 TM 9-2320-341-10 0141

INFLATE TIRE

1. Remove air hose (1) from stowage and connect air hose (1) to quick-disconnect
coupling (2) by pushing back sleeve (3).

0141-2
 TM 9-2320-341-10 0141

2 3 3

DRIVER SIDE
PASSENGER SIDE (ALL VEHICLES
(ALL VEHICLES EXCEPT
EXCEPT M984) M983 AND M984)

2 3 3

2
DRIVER SIDE
PASSENGER SIDE
(M983)
(M984)

2
DRIVER SIDE
4 (M984)

Figure 1.
2. Connect combined pressure gauge/inflation hose (4) to air hose (1).
3. Start engine. (WP 0044)

0141-3
 TM 9-2320-341-10 0141

4. Remove valve stem cap (5) from valve stem (6).

Figure 2.

WARNING

Prior to inflating or deflating tire, stand clear of trajectory area. Failure to

comply may result in injury or death to personnel.

NOTE
• Trajectory area as shown applies to all wheel/tire assemblies.
• Air chuck must clamp securely with no leaks or air pressure gauge
readings will be inaccurate.

0141-4
 TM 9-2320-341-10 0141

• There are two types of air pressure gauges. One model is a separate
handheld gauge . The other is a combined pressure gauge/inflation
hose.
• Both may be used to check air pressure in tire.
• ALWAYS use combined pressure gauge/inflation hose to inflate tire.
5. Push latch handle (7) inward, while pushing air chuck (8) onto valve stem (6). Release
latch handle (7) and immediately step out of the trajectory area and read tire air pressure
gauge.

TRAJECTORY

TRAJECTORY

7
TRAJECTORY TRAJECTORY

Figure 3.

WARNING

Prior to inflating or deflating tire, stand clear of trajectory area. Failure to

comply may result in injury or death to personnel.

0141-5
 TM 9-2320-341-10 0141

NOTE
Trajectory area as shown applies to all wheel/tire assemblies.
6. Inflate or deflate until proper pressure is attained. Press latch handle (7) and pull air
chuck (8) from valve stem extension (6). Install valve cap (5).

TRAJECTORY

TRAJECTORY

6
5
7
TRAJECTORY TRAJECTORY

Figure 4.
7. Shut OFF engine. (WP 0057)

WARNING

Hold end of air line when disconnecting from quick-disconnect coupling.

Air line is under pressure and can be ejected at a high rate of speed.
Failure to comply may result in injury or death to personnel.
8. Remove combined pressure gauge/inflation hose (4) from air hose (1).

0141-6
 TM 9-2320-341-10 0141

2 3 3

DRIVER SIDE
PASSENGER SIDE (ALL VEHICLES
(ALL VEHICLES EXCEPT
EXCEPT M984) M983 AND M984)

2 3 3

2
DRIVER SIDE
PASSENGER SIDE
(M983)
(M984)

2
DRIVER SIDE
4 (M984)

Figure 5.
9. Hold end of air hose (1) and push sleeve (3) back and remove air hose (1) from quick-
disconnect coupling (2).

0141-7
 TM 9-2320-341-10 0141

10. Stow air hose (1) and combined pressure gauge/inflation hose (4).

END OF TASK

FOLLOW-ON MAINTENANCE

1. Remove wheel chocks.

END OF WORK PACKAGE

0141-8
 TM 9-2320-341-10 0142

OPERATOR MAINTENANCE
OPEN/CLOSE BATTERY BOX

INITIAL SETUP:

Equipment Condition
Engine OFF. (WP 0057)
Wheels chocked. (WP 0072)

OPEN BATTERY BOX

WARNING

Wear proper eye protection when working around batteries. Failure to

comply may result in injury or death to personnel.

WARNING

Batteries produce explosive gases. Do not smoke or use open flame near
batteries. Do not allow hot, sparking, or glowing objects near batteries. If
batteries are giving off gases, presence of a heat, flame, or spark may
cause fire and/or explosion. Failure to comply may result in injury or death
to personnel.

WARNING

Use extreme care not to short out battery terminals. Remove all jewelry
such as rings, ID tags, bracelets, etc. prior to working on or around ve-
hicle. Jewelry and tools can catch on equipment, contact positive elec-

0142-1
 TM 9-2320-341-10 0142

trical circuits, and cause a direct short, severe burns, or electrical shock.
Failure to comply may result in injury or death to personnel.

WARNING

LEAD-ACID BATTERIES - Avoid battery electrolyte contact with

skin, eyes, or clothing. If battery electrolyte spills, take immediate
action to stop burning effects:
• External - If battery electrolyte contacts skin, immediately flush
effected area with cold running water to remove all acid. Failure to
comply may result in injury or death to personnel.
• Eyes - If battery electrolyte contacts eyes, immediately flush eyes
with cold water for 15 minutes and seek immediate medical attention.
IMPORTANT - If only one eye is affected, ensure the affected eye is
always (during both flushing and transport) kept lower (the lower the
better) than unaffected eye. This will help keep affected eye from
draining into (and contaminating) the unaffected eye. Failure to
comply may result in injury or death to personnel.
• Internal - If battery electrolyte is ingested (swallowed), drink large
amounts of water or milk. Follow with milk of magnesia, a beaten egg,
or vegetable oil and seek immediate medical attention. Failure to
comply may result in injury or death to personnel.
• Clothing or vehicle - Immediately flush area with cold water and
neutralize battery electrolyte with baking soda or household
ammonia solution. Failure to comply may result in injury or death to
personnel.
1. Disconnect two rubber hooks (1).

0142-2
 TM 9-2320-341-10 0142

Figure 1.
2. Slide cover (2) up and out.
3. Hold cover (2) in place or remove cover.

END OF TASK

CLOSE BATTERY BOX

WARNING

Wear proper eye protection when working around batteries. Failure to

comply may result in injury or death to personnel.

WARNING

Batteries produce explosive gases. Do not smoke or use open flame near
batteries. Do not allow hot, sparking, or glowing objects near batteries. If
batteries are giving off gases, presence of a heat, flame, or spark may
cause fire and/or explosion. Failure to comply may result in injury or death
to personnel.

0142-3
 TM 9-2320-341-10 0142

WARNING

Use extreme care not to short out battery terminals. Remove all jewelry
such as rings, ID tags, bracelets, etc. prior to working on or around ve-
hicle. Jewelry and tools can catch on equipment, contact positive elec-
trical circuits, and cause a direct short, severe burns, or electrical shock.
Failure to comply may result in injury or death to personnel.

WARNING

LEAD-ACID BATTERIES - Avoid battery electrolyte contact with

skin, eyes, or clothing. If battery electrolyte spills, take immediate
action to stop burning effects:
• External - If battery electrolyte contacts skin, immediately flush
effected area with cold running water to remove all acid. Failure to
comply may result in injury or death to personnel.
• Eyes - If battery electrolyte contacts eyes, immediately flush eyes
with cold water for 15 minutes and seek immediate medical attention.
IMPORTANT - If only one eye is affected, ensure the affected eye is
always (during both flushing and transport) kept lower (the lower the
better) than unaffected eye. This will help keep affected eye from
draining into (and contaminating) the unaffected eye. Failure to
comply may result in injury or death to personnel.
• Internal - If battery electrolyte is ingested (swallowed), drink large
amounts of water or milk. Follow with milk of magnesia, a beaten egg,
or vegetable oil and seek immediate medical attention. Failure to
comply may result in injury or death to personnel.
• Clothing or vehicle - Immediately flush area with cold water and
neutralize battery electrolyte with baking soda or household
ammonia solution. Failure to comply may result in injury or death to
personnel.
1. Slide cover (2) on battery box (3).

0142-4
 TM 9-2320-341-10 0142

Figure 2.
2. Align rubber hooks (1) and brackets (4).
3. Connect rubber hooks (1).

END OF TASK

FOLLOW-ON MAINTENANCE

1. None.

END OF WORK PACKAGE

0142-5
 TM 9-2320-341-10 0143

OPERATOR MAINTENANCE
OPEN/CLOSE ENGINE COVERS AND ENGINE SIDE PANEL REMOVAL/
INSTALLATION

INITIAL SETUP:

Equipment Condition Wheels chocked. (WP 0072)

Engine OFF. (WP 0057) Tire carrier lowered (if opening
passenger side engine cover). (WP
0038)

OPEN ENGINE COVERS

NOTE
Driver side and passenger side engine covers are opened the same way.
Driver side shown.
1. Lift handle (1) and turn clockwise.

Figure 1.

2. Lift engine cover (2).

3. Release hood prop rod (3) from holding bracket (4).

0143-1
 TM 9-2320-341-10 0143

3 4

Figure 2.

4. Insert hood prop end (5) into support bracket (6).

0143-2
 TM 9-2320-341-10 0143

5 6

Figure 3.

END OF TASK

CLOSE ENGINE COVERS

NOTE
Driver side and passenger side engine covers are closed the same way.
Driver side shown.
1. Remove hood prop rod end (5) from support bracket (6).

0143-3
 TM 9-2320-341-10 0143

5 6

Figure 4.

2. Insert hood prop rod (3) into holding bracket (4).

0143-4
 TM 9-2320-341-10 0143

3 4

Figure 5.

3. Close engine cover (2).

Figure 6.

4. Turn handle (1) counterclockwise and fold down handle (1).

END OF TASK

DRIVER SIDE ENGINE ACCESS PANEL REMOVAL

1. Unlatch two rubber latches (1) from brackets (2).

0143-5
 TM 9-2320-341-10 0143

3
3

1 2

Figure 7.

2. Open access panel (3).

3. Lift access panel (3) straight up and remove from two hinge pins (4).

END OF TASK

DRIVER SIDE ENGINE ACCESS PANEL INSTALLATION

1. Install access panel (3) on two hinge pins (4).

0143-6
 TM 9-2320-341-10 0143

3
3

1 2

Figure 8.

2. Close access panel (3).

3. Latch two rubber latches (1) on brackets (2).

END OF TASK

FOLLOW-ON MAINTENANCE

1. Raise tire carrier (if passenger side engine cover was opened). (WP 0038)
2. Remove wheel chocks.

END OF WORK PACKAGE

0143-7
 TM 9-2320-341-10 0144

OPERATOR MAINTENANCE
PRIMING FUEL SYSTEM

INITIAL SETUP:

Materials/Parts Equipment Condition

Rag, Wiping (WP 0149, Table 1, Item Driver side engine cover opened. (WP
50) 0143)
Driver side engine access panel
opened. (WP 0143)

PRIMING

WARNING

Fuel and oil are slippery and can cause falls. To avoid injury, wipe up
spilled oil with a clean cloth. Failure to comply may result in injury or death
to personnel.

WARNING

Fuel is very flammable and can explode easily. Keep fuel away from open
fire and keep fire extinguisher within easy reach when working with fuel.
Do not work on fuel system when engine is hot. Fuel can be ignited when
engine is hot. When working with fuel, post signs that read NO SMOKING
WITHIN 50 FEET OF VEHICLE. Failure to comply may result in injury or
death to personnel.
1. Loosen air bleed plug (1) three full turns. Do not remove air bleed plug.

0144-1
 TM 9-2320-341-10 0144

Figure 1.

2. Turn knob (2) counterclockwise until knob (2) can be pulled out.
3. Push and pull knob (2) on priming pump (3) until fuel appears at air bleed plug (1).
4. Tighten air bleed plug (1).
5. Push and pull knob (2) until strong resistance is felt.

CAUTION
Fuel priming pump knob must be in locked position prior to starting en-
gine. Failure to comply may result in damage to equipment.
6. Push knob (2) in and turn clockwise until locked.

CAUTION
If engine fails to start within 30 seconds, turn ignition switch to OFF and
allow starter motor to cool at least two minutes before trying again. Failure
to comply may result in damage to equipment.

NOTE
If vehicle does not start after three attempts, contact field level mainte-
nance.

0144-2
 TM 9-2320-341-10 0144

7. Attempt to start engine. (WP 0044) If engine fails to start or does not operate smoothly
for more than 30 seconds, repeat Steps (1) through (6).

END OF TASK

FOLLOW-ON MAINTENANCE

1. Close driver side engine access panel. (WP 0143)

2. Close driver side engine cover. (WP 0143)

END OF WORK PACKAGE

0144-3
 TM 9-2320-341-10 0145

OPERATOR MAINTENANCE
OPEN/CLOSE CIRCUIT BREAKER ACCESS PANEL

INITIAL SETUP:

Equipment Condition
Engine OFF. (WP 0057)
Wheels chocked. (WP 0072)

OPEN

1. Push in two screws (1) and turn counterclockwise to release screws (1) and open circuit
breaker access panel (2).

1 2

Figure 1.

END OF TASK

CLOSE

1. Close circuit breaker access panel (2) and turn two screws (1) clockwise to lock.

0145-1
 TM 9-2320-341-10 0145

1 2

Figure 2.

END OF TASK

FOLLOW-ON MAINTENANCE

1. None.

END OF WORK PACKAGE

0145-2
TM 9-2320-341-10

CHAPTER 6

SUPPORTING
INFORMATION
 TM 9-2320-341-10 0146

FIELD MAINTENANCE
REFERENCES

SCOPE

This work package lists all pamphlets, forms, field manuals, technical manuals, and other
publications referenced in this manual. Also, those publications that should be consulted
for additional information about vehicle operations are listed.
DEPARTMENT OF ARMY PAMPHLETS
The following indexes should be consulted frequently for latest changes or revisions and
for new publications relating to material covered in this technical manual.

DA PAM 25-30 Consolidated Index of Army Publications and Blank Forms

DA PAM 25-33 User's Guide for Army Publications and Forms
DA PAM 710-2-1 Using Unit Supply System (Manual Procedures)
DA PAM 750-8 The Army Maintenance Management System (TAMMS) Users
Manual

FORMS
DA FORM 2028 Recommended Changes to Publications and Blank Forms
DA FORM 2401 Organization Control Record for Equipment
DA FORM 2402 Maintenance Tag
DA FORM 2404 Equipment Inspection and Maintenance Worksheet
DA FORM 2407 Maintenance Request
DA FORM 2407-1 Maintenance Request Continuation Sheet
DA FORM 2408 Equipment Log Assembly (Records)
DA FORM 2408-9 Equipment Control Record
DA FORM 5988-E Equipment Inspection Maintenance Worksheet (EGA)
DD FORM 250 Material Inspection and Receiving Report
DD FORM 314 Preventive Maintenance Schedule and Record
DD FORM 1149 Requisition and Invoice/Shipping Document
DD FORM 1348-1 DOD Single Line Item Release/Receipt Document
DD FORM 1397 Processing and Deprocessing Record for Shipment, Storage,
and Issue of Vehicles and Spare Engines

0146-1
 TM 9-2320-341-10 0146

FORMS - Continued
DD FORM 2282 Reinspection Decal Convention for Safe Containers
OPTIONAL FORM 346 U.S. Government Motor Vehicle Operator Identification Card
STANDARD FORM 91 Motor Vehicle Accident Report
STANDARD FORM 364 Report of Discrepancy (ROD)
STANDARD FORM 368 Product Quality Deficiency Report
STANDARD FORM 4895 Equipment Preservation Data Sheet (EPDS)

FIELD MANUALS
FM 3-6 Field Behavior of NBC Agents (Including Smoke and
Incendiaries)
FM 3-11.3 Multiservice Tactics, Techniques, and Procedures For
Chemical, Biological, Radiological, and Nuclear
Decontamination Avoidance {MCWP 3-37.2A, NTTP 3-11.25,
AFTTP(I) 3-2.56}
FM 3-11.4 Multiservice Tactics, Techniques, and Procedures For Nuclear,
Biological, and Chemical (NBC) Protection {MCWP 3-37.2;
NTTP 3-11.27; AFTTP (I) 3-2.46} (This Item is included on EM
0205)
FM 3-11.5 Multiservice Tactics, Techniques, and Procedures For
Chemical, Biological, Radiological, and Nuclear
Decontamination {MCWP 3-37.3; NTTP 3-11.26; AFTTP(I)
3-2.60}
FM 4-25.11 First Aid
FM 4-30.31 Recovery and Battle Damage Assessment and Repair
FM 5-100-15 Corps Engineer Operations
FM 5-125 Rigging Techniques, Procedures, and Applications
FM 9-207 Operation and Maintenance of Ordnance Materiel in Cold
Weather
FM 10-16 General Fabric Repair
FM 10-67-1 Concepts and Equipment of Petroleum Operations
FM 20-3 Camouflage, Concealment, and Decoys
FM 21-10 Field Hygiene and Sanitation
FM 21-305 Manual for the Wheeled Vehicle Driver
FM 31-70 Basic Cold Weather Manual
FM 31-71 Northern Operations
FM 55-21 Railway Operating and Safety Rules

0146-2
 TM 9-2320-341-10 0146

FIELD MANUALS - Continued

FM 55-30 Army Motor Transport Units and Operations
FM 90-3 Desert Operations
FM 90-13 River Crossing Operations

TECHNICAL BULLETINS
TB ORD 1030 Manufacture of Data Plates
TB 5-5420-234-15 Warranty Program for Common Bridge Transporter (CBT)
TB 9-2300-281-35 Standards for Oversea Shipment or Domestic Issue of Special
Purpose Vehicles, Combat, Tactical, Construction, and
Selected Industrial and Troop Support US Army Tank-
Automotive Materiel Readiness Command Managed Items
TB 9-2300-422-20 Security of Tactical Wheeled Vehicles
TB 43-0001-62-SERIES Equipment Improvement Report and Maintenance Digest for
Tank, Automotive, and Armament Equipment
TB 43-0142 Safety Inspection and Testing of Lifting Devices
TB 43-0209 Color, Marking and Camouflage Painting of Military Vehicles,
Construction Equipment, and Materials Handling Equipment
TB 43-0212 Purging, Cleaning, and Coating Interior Ferrous and Terne
Sheet Vehicle Fuel Tanks
TB 43-0216 Safety and Hazard Warnings for Operation and Maintenance of
TACOM Equipment
TB 750-651 Use of Antifreeze Solutions, Antifreeze Extender, Cleaning
Compounds and Test Kit in Engine Cooling Systems
TB 9-289 Reconditioning of Type I and Type II Reusable Metal Containers

TECHNICAL MANUALS
TM 3-4230-214-12&P Operator's and Unit Maintenance Manual Including Repair Parts
and Special Tools List for Decontamination Apparatus
TM 3-4240-280-10 Operator's Manual for Mask, Chemical-Biological: Aircraft, ABC-
M24 and Accessories and Mask, Chemical-Biological, Tank,
M25A1 and Accessories (Reprinted W/Basic Incl C1-2) (This
item is included on EM 0045)
TM 3-6665-225-12 Operator's and Organizational Maintenance Manual: for Alarm
Chemical
TM 5-1940-277-10 Operator’s Manual for Boat, Bridge Erection, Twin Jet,
Aluminum Hull, Models USCSBMK 1 (NSN 1940-01-105-5728)
and USCSBMK 2 (1940-01-218-9165)
TM 5-2090-202-12&P Operator’s and Unit Maintenance Manual (Including Repair
Parts and Special Tools List) for Cradle, Bridge Erection Boat,
Twin Jet, Aluminum Hull (NSN 2090-01-106-9789)

0146-3
 TM 9-2320-341-10 0146

TECHNICAL MANUALS - Continued

TM 5-5420-208-12&P Operator and Unit Maintenance Manual Including Repair Parts
and Special Tools List for Cargo Pallet, Ribbon Bridge
Transporter (NSN 5420-01-006-7436)
TM 5-5420-209-12 Operator’s and Unit Maintenance Manual for Improved Float
Bridge (Ribbon Bridge)
TM 5-5420-277-14&P Operator’s, Unit, Direct Support, and General Support
Maintenance Manual (Including Repair Parts and Special Tools
List) for Cradle, Boat, Improved, M14, (NSN 3990-01-442-1914)
TM 9-214 Inspection, Care and Maintenance of Antifriction Bearings
TM 9-243 Use and Care of Hand Tools and Measuring Tools
TM 9-1005-245-13&P Operator’s, Unit, and Direct Support Maintenance Manual with
Repair Parts and Special Tools List (RPSTL) for Machine Gun
Mounts and Combinations for Tactical/Armored Vehicles
TM 9-1440-600-10 Operator’s Manual, Launching Station, M901 Guided Missile,
Semitrailer Mount
TM 9-2330-357-14&P Operator's, Organizational, Direct Support, and General
Support Maintenance Manual (Including Repair Parts and
Special Tools Lists) For Semitrailer, Flatbed, Radar Set and
Launching Station M860A1 (NSN 2330-01-117-3280) (This Item
Is Included On EM 0049)
TM 9-2330-385-14 Operator's, Unit, Direct Support and General Support
Maintenance Manual for Palletized Load System Trailer (PLST)
Model M1076 (NSN 2330-01-303-5197)
TM 9-2330-385-24P Unit, Direct Support and General Support Maintenance Repair
Parts and Special Tools List for Trailer, Palletized Load System
(PLST) Model M1076 (NSN 2330-01-303-5197)
TM 9-2610-200-14 Operator's, Unit, Direct Support, and General Support
Maintenance Manual for Care, Maintenance, Repair, and
Inspection of Pneumatic Tires and Inner Tubes
TM 9-3990-206-14&P Operator's Unit, Direct Support and General Support
Maintenance Manual (Including Repair Parts and Special Tools
List) for Palletized Load System (PLS) Flatrack Model M1077/
M1077A1
TM 9-3990-260-14&P Operator's, Unit, Direct Support and General Support
Maintenance Manual (Including Repair Parts and Special Tools
List) For Container Roll-In/Out Platform (CROP) Model M3
(NSN 3990-01-442-2751); Container Roll-In/Out Platform
(CROP) Model M3A1 (3990-01-450-5671) (This Item is Included
on EM 0038 and EM 0052)
TM 9-2330-366-14&P Operator's, Organizational, Direct Support, and General
Support Maintenance Including Repair Parts and Special Tools
Lists For Semitrailer, Lowbed, 12-Ton, XM974 (NSN
2330-01-116-0288)

0146-4
 TM 9-2320-341-10 0146

TECHNICAL MANUALS - Continued

TM 9-4910-571-12&P Operator’s and Organizational Maintenance Manual (Including
Repair Parts and Special Tools List) for Simplified Test
Equipment for Internal Combustion Engines (STE/ICE-R)
TM 9-4910-783–13&P Operator's, Unit, and Direct Support Maintenance Manual
(Including Repair Parts and Special Tools List) for Standard
Automotive Test Set (SATS)
TM 9-4940-468-13 Operator’s, Unit, and Direct Support Maintenance Manual for
Tool Outfit, Hydraulic Systems Test and Repair Unit (HSTRU)
TM 9-4940-568-10 Operator’s Maintenance Manual for Forward Repair System
(FRS)
TM 9-6115-465-24P Unit, Direct Support and General Support Maintenance Repair
Parts and Special Tools List (Including Deport Maintenance
Repair Parts and Special Tools List) for Generator Set, Diesel
Engine Driven, Tactical
TM 9-6140-200-14 Operator’s, Unit, Direct Support and General Support
Maintenance Manual for Lead-Acid Storage Batteries
TM 9-8000 Principles of Automotive Vehicles
TM 11-5820-498-12 Operator’s and Organizational Maintenance Manual: Radio
Sets
TM 11-5820-498-35 Direct Support, General Support, and Depot Maintenance
Manual for Radio Sets
TM 38-250 Preparing Hazardous Materials for Military Air Shipments
TM 43-0139 Painting Instructions for Army Materiel
TM 55-2200-001-12 Transportability Guidance for Application of Blocking, Bracing
and Tiedown Materials for Rail Transport
TM 55-2320-279-14 Transportability Guidance Heavy Expanded Mobility Tactical
Truck (HEMTT)
TM 750-244-3 Procedures for Destruction of Equipment to Prevent Enemy Use
(Mobility Equipment Command)
TM 750-244-6 Procedures for Destruction of Tank Automotive Equipment to
Prevent Enemy Use (U.S. Army Tank-Automotive Command)
TM 750-254 Cooling Systems: Tactical Vehicles
TM 5-2330-378-14&P Operator's, Unit, Direct Support, and General Support
Maintenance Manual (Including Repair Parts and Special Tools
List) for Semitrailer, Lowbed: 40-Ton Construction Equipment
Transporter, M870 (CCE) (CMI/Load King Model 403LF), and
M870A1
TM 5-2330-325-14&P Operator's, Unit, and Direct Support Maintenance Manual with
Repair Parts and Special Tools List (RPSTL) for Trailer, Medium
Heavy Equipment Transporter (MHET), 40-Ton, M870A3
TM 9-2330-213-14&P Operator’s, Unit, Direct Support, and General Support
Maintenance Manual (Including Repair Parts and Special Tools
Lists) For Trailer, Chassis: 1-1/2-Ton, 2-Wheel M103A1 (NSN

0146-5
 TM 9-2320-341-10 0146

TECHNICAL MANUALS - Continued

2330-00-835-8629) M103A3 (NSN 2330-00-141-8052) Trailer,
Cargo: 1-1/2-Ton, 2-Wheel M105A1 (NSN 2330-00-835-8631)
M105A2 (NSN 2330-00-141-8050) M105A2C (NSN
2330-00-542-5689) Trailer, Tank, Water: 1-1/2-Ton, 2-Wheel,
400-Gallon M107A1 (NSN 2330-00-835-8633) M107A2 (NSN
2330-00-141-8049) M107A2C (NSN 2330-00-542-5688)
Trailer, Van, Shop: Folding Sides, 1-1/2-Ton, 2-Wheel M448
(NSN 2330-00-631-5692)
TM 9-2330-231-14&P Technical Manual Operator's, Organizational, Direct Support,
And General Support Maintenance (Including Repair Parts and
Special Tools List) Trailer, Ammunition: 1 1/2-Ton, 2-Wheel,
M332 (NSN 2330-00-200-1785)
TM 9-2330-368-14&P Operators, Organizational, Including Repair Parts and Special
Tools List For Trailer, Ammunition, Heavy Expanded Mobility,
11-Ton, M989 (NSN 2330-01-109-4258)

MISCELLANEOUS PUBLICATIONS
AR 70-1 Army Acquisition Policy
AR 200-1 Environmental Protection and Enhancement
AR 385-55 Prevention of Motor Vehicle Accidents
AR 700-138 Army Logistics Readiness and Sustainability
AR 700-139 Army Warranty Program
AR 702-7 Product Quality Deficiency Report Program
AR 750-1 Army Materiel Maintenance Policy
AR 750-10 Army Modification Program
CTA 8-100 Army Medical Department Expendable/Durable Items
CTA 50-970 Expendable/Durable Items (Except Medical, Class V, Repair
Parts, and Heraldic Items)
GPM 94-02 Maintenance Advisory for Purging all Fuel Tankers using a
Biodegradable Purging Solution
SB 725-92-1 US Army Missile Command Nonexpendable Reusable Shipping
and Storage Containers
TC 9-237 Welding Theory and Application
TC 9-510 Metal Body Repair and Related Operations
TO 00-25-234 General Shop Practice Requirements for Repair, Maintenance,
and Test of Electronic Equipment

END OF WORK PACKAGE

0146-6
 TM 9-2320-341-10 0147

OPERATOR MAINTENANCE
COMPONENTS OF END ITEM AND BASIC ISSUE ITEMS LISTS

INTRODUCTION

Scope
This work package lists COEI and BII for the HEMTT series vehicles to help you inventory
items required for safe and efficient operation.

General
The Components of End Item and Basic Issue Items Lists are divided into the following lists:

Components of End Item (COEI) This listing is for informational purposes only and is not
authority for requisition replacements. These items are part of the HEMTT series vehicle.
As part of the end item, these items must be with the end item whenever it is issued or
transferred between property accounts. Items of COEI are removed and separately
packaged for transportation or shipment only when necessary. Illustrations are furnished to
help you find and identify the items.

Basic Issue Items (BII) These are the minimum essential items required to place the
HEMTT series vehicle in operation, to operate it, and to perform emergency repairs.
Although shipped separately packaged, BII must be with the vehicle during operation and
when it is transferred between property accounts. Listing these items is your authority to
request/requisition them for replacement based on your authorization of the end item by the
TOE/MTOE. Illustrations are furnished to help you find and identify the items.

Explanation of Entries in the COEI List and BII List

The following provides an explanation of columns found in the tabular listings:

Item Number. Gives you the reference number of the item listed.

National Stock Number (NSN) and Illustration. Identifies the stock number of the item to
be used for requisitioning purposes and provides an illustration of the item.

Description, Part Number/(CAGEC). Identifies the Federal item name (in all capital letters)
followed by a minimum description when needed. The stowage location of COEI and BII is
also included in this entry. The last line below the description is the part number and the
Commercial and Government Entity Code (CAGEC) (in parentheses).

Usable On Code. When applicable, gives you a code if the item you need is not the same
for different models of equipment. These codes are identified below:

0147-1
 TM 9-2320-341-10 0147

Table 1. List of Usable On Codes

Code Used On

L14 M983A4LET Tractor w/o winch

Column (5) - U/I Unit of Issue (U/I) U/I. Unit of Issue (U/I) indicates the physical
measurement or count of the item as issued per the National Stock Number shown in
column (2).

Column (6) - Qty. Indicates the quantity required.

COMPONENTS OF END ITEM

Table 2. Components of End Item

(1) (2) (3) (4) (5) (6)

Usable
Illus National Stock Number Description, Part On Qty
No. (NSN) Number/(CAGEC) Code U/I Rqr

1 6150-01-231-6662 CABLE ASSEMBLY, L14 EA 1

POWER,
ELECTRICAL: HD
Winch (Located in driver
side stowage box)
1491030(45152)

2 2540-01-166-1384 LADDER, VEHICLE L14 EA 1

BOARDING (Located
on passenger side of
vehicle on walkway
grating)
1766590W(45152)

0147-2
 TM 9-2320-341-10 0147

Table 2. Components of End Item - Continued

(1) (2) (3) (4) (5) (6)

Usable
Illus National Stock Number Description, Part On Qty
No. (NSN) Number/(CAGEC) Code U/I Rqr

3 2590-01-217-8317 STATION, WINCH L14 EA 1

CONTROL: HD Winch
(Located in driver side
stowage box)
1437940U(45152)

4 5995-00-772-8813 WIRE, VEHICLE TO L14 EA 1

TRAILER
64297CX(45152)

Table 3. Basic Issue Items

(1) (2) (3) (4) (5) (6)

Usable
Illus National Stock Number Description, Part On Qty
No. (NSN) Number/(CAGEC) Code U/I Rqr

1 8105-01-353-2497 BAG, TEXTILE: L14 EA 1

Pamphlet (Located in
cabin in glove box
forward of passenger/
crew seat)
1362710(45152)

0147-3
 TM 9-2320-341-10 0147

Table 3. Basic Issue Items - Continued

(1) (2) (3) (4) (5) (6)

Usable
Illus National Stock Number Description, Part On Qty
No. (NSN) Number/(CAGEC) Code U/I Rqr

2 7510-00-889-3494 BINDER, LOOSE-LEAF L14 EA 1

(Located on passenger
side of cab in glove box)
11677003(19207)

3 4010-01-200-1506 CHAIN ASSEMBLY, L14 EA 1

SINGLE LEG: 7 ft. Limp
Home (Located in driver
side tool box)
1452490(45152)

4 4010-01-249-0548 CHAIN ASSEMBLY, L14 EA 1

SINGLE LEG: 14 ft.
Utility (Located in driver
side tool box)
00044-9973(96508)

5 2540-01-165-6136 CHOCK, WHEEL- L14 EA 4

TRACK (Located in
wheel chock stowage
box (carries a maximum
of two wheel chocks)
and vehicle mounted
stowage boxes)
CS-2540-0067(16236)

0147-4
 TM 9-2320-341-10 0147

Table 3. Basic Issue Items - Continued

(1) (2) (3) (4) (5) (6)

Usable
Illus National Stock Number Description, Part On Qty
No. (NSN) Number/(CAGEC) Code U/I Rqr

6 4210-01-133-9053 EXTINGUISHER, FIRE: L14 EA 1

2.7 lbs, 10 BC (Located:
mounted to rear cabin
wall, left of crew/
passenger seat)
429101(03670)

7 6545-00-922-1200 FIRST AID KIT, L14 EA 1

GENERAL PURPOSE
(Located in cabin in
glove box forward of
passenger/crew seat)
SCC-6545-ILVOL2
(64616)

8 4910-01-003-9599 GAUGE, TIRE L14 EA 2

PRESSURE, SELF-
CONTAINED (Located
in cabin in glove box
forward of passenger/
crew seat)
61-J2-1506(94894)

0147-5
 TM 9-2320-341-10 0147

Table 3. Basic Issue Items - Continued

(1) (2) (3) (4) (5) (6)

Usable
Illus National Stock Number Description, Part On Qty
No. (NSN) Number/(CAGEC) Code U/I Rqr

9 5340-01-209-7841 HANDLE, EXTENSION L14 EA 1

(for lug wrench)
(Located in driver side
tool box)
1347720(45152)

10 5340-01-558-6515 HANDLE, PUMP, TIRE L14 EA 1

CARRIER (Located in
passenger side stowage
box)
3636440(45152)

11 5120-01-233-9508 HANDLE, SOCKET L14 EA 1

WRENCH: Wheel
Lugnut (Located in
driver side toolbox)
ORR301(66784)

0147-6
 TM 9-2320-341-10 0147

Table 3. Basic Issue Items - Continued

(1) (2) (3) (4) (5) (6)

Usable
Illus National Stock Number Description, Part On Qty
No. (NSN) Number/(CAGEC) Code U/I Rqr

12 4720-01-558-6415 HOSE ASSEMBLY, L14 EA 2

NONMETALLIC: Air 50
ft.
2155210U(45152)

13 4910-01-386-4300 INFLATOR-GAUGE, L14 EA 2

PNEUMATIC TIRE
(Located in cabin in
glove box forward of
passenger/crew seat)
I-405M(63900)

14 5120-01-146-8096 JACK, HYDRAULIC, L14 EA 1

HAND: 12 Ton with
Handle (Located in
driver side tool box)
EBJ-12GC(26952)

0147-7
 TM 9-2320-341-10 0147

Table 3. Basic Issue Items - Continued

(1) (2) (3) (4) (5) (6)

Usable
Illus National Stock Number Description, Part On Qty
No. (NSN) Number/(CAGEC) Code U/I Rqr

15 5340-00-158-3807 PADLOCK: With Chain L14 EA 2

(for stowage boxes)
AA59487-2SC(58536)

16 5340-00-158-3805 PADLOCK: Without L14 EA 1

Chain (for steering
column) (Located in
steering column lock
bracket under dash)
AA59487-2S(58536)

17 2540-01-165-5987 PLATE, BASE, JACK L14 EA 1

(Located in driver side
toolbox)
2540V0730(16236)

18 5120-01-480-0640 PLIERS, SLIP JOINT: L14 EA 1

10 in. Adjustable
(Located in driver side
toolbox - part of tool roll)
1350150(45152)

0147-8
 TM 9-2320-341-10 0147

Table 3. Basic Issue Items - Continued

(1) (2) (3) (4) (5) (6)

Usable
Illus National Stock Number Description, Part On Qty
No. (NSN) Number/(CAGEC) Code U/I Rqr

19 9905-01-480-0644 REFLECTOR SET, L14 SE 1

HIGHWAY WARNING,
TRIANGULAR (Located
in cabin mounted under
glove box forward of
passenger/crew seat)
6432GBX(45152)

20 5140-01-167-1541 ROLL, TOOLS AND L14 EA 1

ACCESSORIES
(Located in driver side
stowage box)
1350190(45152)

21 5120-01-398-8053 SCREWDRIVER, L14 EA 1

CROSS TIP: Phillips No.
3 (Located in driver side
toolbox - part of tool roll)
SDFP56(96508)

22 5120-00-293-3309 SCREWDRIVER, FLAT L14 EA 1

TIP: No. 6 (Located in
driver side toolbox - part
of tool roll)
66-110(03914)

0147-9
 TM 9-2320-341-10 0147

Table 3. Basic Issue Items - Continued

(1) (2) (3) (4) (5) (6)

Usable
Illus National Stock Number Description, Part On Qty
No. (NSN) Number/(CAGEC) Code U/I Rqr

23 4030-00-377-1397 SHACKLE: Anchor, L14 EA 1

Limp Home (Located in
driver side toolbox)
RR-C-271
TY4AGRBCL2SZ
1.000(81348)

24 4030-01-316-1552 SHACKLE: Towing: L14 EA 4

(Located on front and
rear towing eyes)
RR-C-271D
TYIVAGRACL1 3/8 IN
(81348)

25 5120-01-436-2924 WRENCH, L14 EA 1

ADJUSTABLE: 8 in.
(Located in driver side
toolbox - part of tool roll)
AC18(96508)

26 5120-00-264-3796 WRENCH, L14 EA 1

ADJUSTABLE: 12 in.
(Located in driver side
toolbox - part of tool roll)
120405A(45152)

0147-10
 TM 9-2320-341-10 0147

Table 3. Basic Issue Items - Continued

(1) (2) (3) (4) (5) (6)

Usable
Illus National Stock Number Description, Part On Qty
No. (NSN) Number/(CAGEC) Code U/I Rqr

27 5120-01-070-8386 WRENCH, SOCKET: L14 EA 1

Wheel Nut (Located in
driver side tool box)
1048-TR(45152)

END OF WORK PACKAGE

0147-11
 TM 9-2320-341-10 0148

OPERATOR MAINTENANCE
ADDITIONAL AUTHORIZATION LIST (AAL)

INTRODUCTION

Scope
This work package lists additional authorization items that are needed to operate and
maintain the HEMTT Series Vehicles.

General
This list identifies items that do not have to accompany the HEMTT Series Vehicles and
that do not have to be turned in with it. These items are all authorized to you by CTA, MTOE,
TDA, or JTA.

Explanation of Columns in the AAL

Column (1) - National Stock Number (NSN). Identifies the stock number of the item to be
used for requisitioning purposes.
Column (2) - Description, Part Number/(CAGEC). Identifies the Federal item name (in all
capital letters) followed by a minimum description when needed. The last line below the
description is the part number and the Commercial and Government Entity Code (CAGEC)
(in parentheses).
Column (3) - Usable On Code. When applicable, gives you a code if the item you need is
not the same for different models of equipment.

Table 1. List of Usable On Codes

Code Used On

L14 M983A4LET Tractor w/o winch

Column (4) - U/I. Unit of Issue (U/I) indicates the physical measurement or count of the item
as issued per the National Stock Number.
Column (5) - Qty Recm. Indicates the quantity recommended.

0148-1
 TM 9-2320-341-10 0148

Table 2. Additional Authorization List

(1) (2) (3) (4) (5)

National
Stock Number Description, Part Number/ Usable Qty
(NSN) (CAGEC) On Code U/I Recom

5110-00-293-2 AXE, SINGLE BIT L14 EA 1

336 6150925(19207)

4910-00-347-9 BAR ASSEMBLY, HOISTING L14 EA 1

703 8690061(52793)

2540-00-409-8 BRACKET ASSEMBLY, TOOL: L14 EA 1

891 PIONEER
MS53053-1(96906)

6150-01-022-6 CABLE ASSEMBLY, POWER, L14 EA 1

004 ELECTRICAL: NATO
11682336-1(19207)

2540-01-152-7 CHAIN, TIRE, EMERGENCY L14 PR 2

813 2624-10-8(46156)

4230-01-220-3 DECONTAMINATION KIT, L14 EA 1

221 INDIVIDUAL EQUIPMENT
5705588(19207)

5130-01-400-0 EXTENSION, SOCKET L14 EA 1

129 WRENCH: IMPACT 3/4 in.
DRIVE, 13 in. LONG
07569(1CV05)

4240-01-220-6 GAS PARTICULATE KIT L14 KT 1

373 3SK663(45152)

8415-00-634-4 GLOVES, LEATHER L14 PR 2

658 37G2940(90142)

5120-00-288-6 HANDLE, MATTOCK-PICK L14 EA 1

574 10501973(56161)

0148-2
 TM 9-2320-341-10 0148

Table 2. Additional Authorization List - Continued

(1) (2) (3) (4) (5)

National
Stock Number Description, Part Number/ Usable Qty
(NSN) (CAGEC) On Code U/I Recom

2990-01-509-1 HEATER, COOLANT, ENGINE: L14 EA 1

954 ARCTIC
3460259(45152)

4720-01-341-4 HOSE ASSEMBLY L14 EA 1

912 1759750U(45152)

4720-01-254-0 HOSE ASSEMBLY, L14 EA 2

189 NONMETALLIC: INTER-
VEHICULAR
MS39325-9-140-8(96906)

5895-01-506-4 INSTALLATION KIT, L14 EA 1

503 ELECTRONIC EQUIPMENT:
C4ISR
3418900(45152)

1005-01-519-2 INSTALLATION KIT: L14 KT 1

126 MOUNTING, MACHINE GUN
1301740UW/OR45152

6665-01-220-3 KIT, CHEMICAL ALARM L14 KT 1

220 5705589(19207)

6220-01-250-5 LIGHT, WARNING: BEACON L14 EA 1

190 3145661(45152)

5120-00-243-2 MATTOCK: PICK L14 EA 1

395 11677022(19207)

5120-00-892-5 MIRROR, INSPECTION L14 EA 1

709 UH1487(11676)

1005-01-266-1 MOUNT, RIFLE: INSTALLATION L14 EA 1

233 5705590(19207)

0148-3
 TM 9-2320-341-10 0148

Table 2. Additional Authorization List - Continued

(1) (2) (3) (4) (5)

National
Stock Number Description, Part Number/ Usable Qty
(NSN) (CAGEC) On Code U/I Recom

5120-00-197-9 PUNCH, BLACKSMITH'S: 17 in. L14 EA 1

473 647008(60903)

4030-01-316-1 SHACKLE: TOWING (used with L14 EA 2

552 towbar, 10 ton)
1307540(45152)

3940-01-270-3 SLING, MULTIPLE LEG: 16 FT. L14 EA 2

389 SAFETY CHAINTwo (2) 16 ft.
safety chains should be used in
conjunction with Tow Bar: 10 Ton
NSN: 2540-00-378-2012, P/N:
8383802, C/C: 19207.
1482010(45152)

5130-01-400-0 SOCKET, SOCKET WRENCH L14 EA 1

164 (3/4 in. drive, 1 3/4 in. hex,
impact)
J07528L(1CV05)

5210-01-220-6 TOOL, FIFTH WHEEL RELEASE L14 EA 1

381 12343468(19207)

2540-00-378-2 TOW BAR, MOTOR VEHICLE: L14 EA 1

012 10 tonShould be used in
conjunction with two (2) safety
chains: 16 ft. NSN:
3940-01-270-3389, P/N:
1482010, C/C: 45152.
8383802(19207)

5130-01-428-3 WRENCH, IMPACT, L14 EA 1

751 PNEUMATIC
1789100U(45152)

END OF WORK PACKAGE

0148-4
 TM 9-2320-341-10 0149

OPERATOR MAINTENANCE
EXPENDABLE AND DURABLE ITEMS LIST

INTRODUCTION

Scope
This work package lists expendable supplies and materials that are needed to operate and
maintain the HEMTT Series Vehicles. This list is for information only and is not authority to
requisition the listed items. These items are authorized to you by CTA 50-970, Expendable/
Durable Items (Except Medical, Class V Repair Parts, and Heraldic Items), CTA 50-909,
Field and Garrison Furnishings and Equipment or CTA 8-100, Army Medical Department
Expendable/Durable Items.

Explanation of Entries in the Expendable/Durable Items List

Item No. This number is assigned to the entry in the list and is referenced in the narrative
instructions to identify the item (e.g., Use brake fluid (Expendable/Durable Items List)).

Level. This column identifies the lowest level of maintenance that requires the listed item.
• C -- Operator/Crew
• O -- Unit/AMC
• F -- Direct Support/ASB
• H -- General Support
• D -- Depot

National Stock Number (NSN). This is the NSN assigned to the item which you can use
to requisition it.

Item Name, Description, Part Number/(CAGEC). This column provides the other
information you need to identify the item. The last line below the description is the part
number and the Commercial and Government Entity Code (CAGEC) (in parentheses).

(U/I). Unit of Issue (U/I) code shows the physical measurement or count of an item, such
as gallon, dozen, gross, etc.
Table 1. Expendable and Durable Items List

(1) (2) (3) (4) (5)

National
Item Stock Number Item Name, Description, Part Number/
No. Level (NSN) (CAGEC) U/I

0149-1
 TM 9-2320-341-10 0149

Table 1. Expendable and Durable Items List - Continued

(1) (2) (3) (4) (5)

National
Item Stock Number Item Name, Description, Part Number/
No. Level (NSN) (CAGEC) U/I

Antifreeze, Arctic Type

1 O 6850-01-441-3 Antifreeze, Arctic Type 55-gal drum DR

248 A-A-52624 (58536)

Antifreeze, Permanent, Glycol,

Inhibited

2 O 6850-01-464-9 Antifreeze, Permanent, Glycol, Inhibited 1- GL

125 gal container
AA52624 (58536)

3 O 6850-00-181-7 Antifreeze, Permanent, Glycol, Inhibited 5- CO

933 gal container
MILA46153 (81349)

4 O 6850-01-464-9 Antifreeze, Permanent, Glycol, Inhibited DR

152 55-gal drum
A-A-52624 TY I RECYCLED (58536)

Cleaner, Lubricant

5 O 9150-01-079-6 Cleaner, Lubricant A,4 oz bottle w/ BT

124 extender tube
MIL-PRF-63460 (81349)

Cleaning Compound, Solvent

6 O 6850-01-474-2 Cleaning Compound, Solvent 1 gallon can GL

319 MIL-PRF-680 Type II (81349)

7 O 6850-01-474-2 Cleaning Compound, Solvent 5 gallon can CO

317 MIL-PRF-680 Type II (81349)

0149-2
 TM 9-2320-341-10 0149

Table 1. Expendable and Durable Items List - Continued

(1) (2) (3) (4) (5)

National
Item Stock Number Item Name, Description, Part Number/
No. Level (NSN) (CAGEC) U/I

8 O 6850-01-474-2 Cleaning Compound, Solvent 55 gallon DR

316 drum
MIL-PRF-680 Type II (81349)

9 O 6850-01-474-2 Cleaning Compound, Solvent 1 gallon can GL

318 MIL-PRF-680 Type III (81349)

10 O 6850-01-474-2 Cleaning Compound, Solvent 5 gallon can BX

320 MIL-PRF-680 Type III (81349)

11 O 6850-01-474-2 Cleaning Compound, Solvent 5 gallon can DR

321 MIL-PRF-680 Type III (81349)

Compound, Cleaning Windshield

12 O 6850-00-926-2 Compound, Cleaning Windshield 1-pt can BX

275 0854-000 (0FTT5)

Fuel, DF-1, Winter

13 O 9140-01-413-7 Fuel, DF-1, Winter Bulk GL

511 VV-F-800 (81348)

14 O 9140-00-286-5 Fuel, DF-1, Winter Bulk GL

286 ASTM D 975 (81346)

15 O 9140-00-286-5 Fuel, DF-1, Winter 5-gal can CN

287 ASTM D 975 (81346)

16 O 9140-00-286-5 Fuel, DF-1, Winter 55-gal drum, 16 gauge DR

288 ASTM D 975 (81346)

17 O 9140-00-286-5 Fuel, DF-1, Winter 55-gal drum, 18 gauge DR

289 ASTM D 975 (81346)

0149-3
 TM 9-2320-341-10 0149

Table 1. Expendable and Durable Items List - Continued

(1) (2) (3) (4) (5)

National
Item Stock Number Item Name, Description, Part Number/
No. Level (NSN) (CAGEC) U/I

Fuel

18 O 9130-01-031-5 Fuel, JP8 Bulk GL

816 MILT83133 GR JP8 (81349)

19 O 9140-01-412-1 Fuel, DF-2, Regular Bulk GL

311 VV-F-800 (81348)

20 O 9140-00-286-5 Fuel, DF-2, Regular Bulk GL

294 ASTM D 975 (81346)

21 O 9140-00-286-5 Fuel, DF-2, Regular 5-gal can CN

295 ASTM D 975 (81346)

22 O 9140-00-286-5 Fuel, DF-2, Regular 55-gal drum, 16 gauge DR

296 ASTM D 975 (81346)

23 O 9140-00-286-5 Fuel, DF-2, Regular 55-gal drum, 18 gauge DR

297 ASTM D 975 (81346)

Grease, Automotive and Artillery GAA

24 O 9150-01-197-7 Grease, Automotive and Artillery GAA TU

688 2-1/2 oz tube
M-10924-A (81349)

25 O 9150-01-197-7 Grease, Automotive and Artillery GAA 14- CA

693 oz cartridge
M-10924-B (81349)

26 O 9150-01-197-7 Grease, Automotive and Artillery GAA 1-lb CN

690 can
M-10924-C (81349)

0149-4
 TM 9-2320-341-10 0149

Table 1. Expendable and Durable Items List - Continued

(1) (2) (3) (4) (5)

National
Item Stock Number Item Name, Description, Part Number/
No. Level (NSN) (CAGEC) U/I

27 O 9150-01-197-7 Grease, Automotive and Artillery GAA 5-lb CN

689 can
M-10924-D (81349)

28 O 9150-01-197-7 Grease, Automotive and Artillery GAA 35- CN

692 lb can
M-10924-E (81349)

Oil, Lubricating Gear, GO 75

29 O 9150-01-035-5 Oil, Lubricating Gear, GO 75 1-qt can QT

390 M2105-1-75W (81349)

30 O 9150-01-048-4 Oil, Lubricating Gear, GO 75 5-gal can GL

593 MIL-PRF-2105 (81349)

31 O 9150-01-035-5 Oil, Lubricating Gear, GO 75 55-gal drum CN

391 M2015-3-75W (81349)

Oil, Lubricating Gear, GO 80W/90

32 O 9150-01-035-5 Oil, Lubricating Gear, GO 80W/90 5-gal CN

393 can
J2360 (81343)

Oil, Lubricating OEA Ice, Subzero

33 O 9150-00-402-4 Oil, Lubricating OEA Ice, Subzero 1-qt can QT

478 EMERY3908D (33358)

34 O 9150-00-402-2 Oil, Lubricating OEA Ice, Subzero 5-gal CN

372 can
MIL-PRF-46167 (81349)

0149-5
 TM 9-2320-341-10 0149

Table 1. Expendable and Durable Items List - Continued

(1) (2) (3) (4) (5)

National
Item Stock Number Item Name, Description, Part Number/
No. Level (NSN) (CAGEC) U/I

35 O 9150-00-491-7 Oil, Lubricating OEA Ice, Subzero 55-gal DR

197 drum, 16 gauge
MIL-PRF-46167 (81349)

Oil, Lubricating OE/HDO 10

36 O 9150-00-189-6 Oil, Lubricating OE/HDO 10 1-qt can QT

727 M2104-1-10W (81349)

37 O 9150-00-186-6 Oil, Lubricating OE/HDO 10 5-gal can CN

668 M2104-3-10W (81349)

38 O 9150-00-191-2 Oil, Lubricating OE/HDO 10 55-gal drum, DR

772 18 gauge
M2104-4-10W (81349)

39 O 9150-01-496-1 Oil, Lubricating OE/HDO 10 55-gal drum, DR

939 16 gauge
MIL-PRF-2104 (81349)

Oil, Lubricating OE/HDO 30, (SAE 30)

40 O 9150-00-183-7 Oil, Lubricating OE/HDO 30, (SAE 30) Bulk GL

808 M2104-2-30W (81349)

41 O 9150-00-186-6 Oil, Lubricating OE/HDO 30, (SAE 30) 1-qt QT

681 can
M2104-1-30W (81349)

42 O 9150-00-188-9 Oil, Lubricating OE/HDO 30, (SAE 30) 5- CN

858 gal can
M2104-3-30W (81349)

43 O 9150-01-433-7 Oil, Lubricating OE/HDO 30, (SAE 30) 55- DR

978 gal drum, 16 gauge
MIL-PRF-2104 (81349)

0149-6
 TM 9-2320-341-10 0149

Table 1. Expendable and Durable Items List - Continued

(1) (2) (3) (4) (5)

National
Item Stock Number Item Name, Description, Part Number/
No. Level (NSN) (CAGEC) U/I

44 O 9150-00-189-6 Oil, Lubricating OE/HDO 30, (SAE 30) 55- DR

729 gal drum, 18 gauge
M2104-4-30W (81349)

Oil, Lubricating OE/HDO 50

45 O 9150-00-188-9 Oil, Lubricating OE/HDO 50 5-gal drum CN

865 BRAYC0423H (98308)

Oil, Lubricating Gear, GO 85W/140

46 O 9150-01-035-5 Oil, Lubricating Gear, GO 85W/140 DR

396 J2360 (81343)

Oil, Lubricating, OE/HDO-15W/40

47 O 9150-01-352-2 Oil, Lubricating, OE/HDO-15W/40 5-gal CO

962 can
A-A-52306 (58536)

48 O 9150-01-152-4 Oil, Lubricating OE/HDO 15W/40 55-gal DR

119 drum, 18 gauge
M2104-4-15W40 (81349)

Oil, Lubricating, OE/HDO 40

49 O 9150-01-467-8 Oil, Lubricating, OE/HDO 40 55-gal drum DR

161 40 GRADE (81343)

Rag, Wiping

50 O 7920-00-205-1 Rag, Wiping 50-pound bale BE

711 7920-00-205-1711 (80244)

0149-7
 TM 9-2320-341-10 0149

Table 1. Expendable and Durable Items List - Continued

(1) (2) (3) (4) (5)

National
Item Stock Number Item Name, Description, Part Number/
No. Level (NSN) (CAGEC) U/I

Rope

51 O 4020-00-968-1 Rope, Fibrous RL

357 MIL-R-17343 (81349)

END OF WORK PACKAGE

0149-8
TACOM Life Cycle Management Command,
ATTN: AMSTA-LC-LMPP/TECH PUBS, 1 Rock
Island Arsenal, Rock Island, IL 61299-7630
TACOM Life Cycle Management Command,
ATTN: AMSTA-LC-LMPP/TECH PUBS, 1 Rock
Island Arsenal, Rock Island, IL 61299-7630
TACOM Life Cycle Management Command,
ATTN: AMSTA-LC-LMPP/TECH PUBS, 1 Rock
Island Arsenal, Rock Island, IL 61299-7630
TACOM Life Cycle Management Command,
ATTN: AMSTA-LC-LMPP/TECH PUBS, 1 Rock
Island Arsenal, Rock Island, IL 61299-7630
TM 9-2320-341-10
TM 9-2320-341-10
TM 9-2320-341-10

084789-000