CONTENTS

SECTION 1 GENERAL

Group 1 Safety Hints -------------------------------------------------------------------------------------------------------- 1-1

Group 2 Specifications ----------------------------------------------------------------------------------------------------- 1-9

SECTION 2 STRUCTURE AND FUNCTION

Group 1 Pump Device ------------------------------------------------------------------------------------------------------ 2-1

Group 2 Main Control Valve --------------------------------------------------------------------------------------------- 2-20
Group 3 Swing Device ------------------------------------------------------------------------------------------------------ 2-47
Group 4 Travel Motor -------------------------------------------------------------------------------------------------------- 2-59
Group 5 RCV Lever ---------------------------------------------------------------------------------------------------------- 2-66
Group 6 Accelerator Pedal ----------------------------------------------------------------------------------------------- 2-73
Group 7 Brake Pedal -------------------------------------------------------------------------------------------------------- 2-74
Group 8 Transmission ------------------------------------------------------------------------------------------------------- 2-76
Group 9 Travel Control Valve ------------------------------------------------------------------------------------------- 2-83
Group 10 Steering Valve ---------------------------------------------------------------------------------------------------- 2-85

SECTION 3 HYDRAULIC SYSTEM

Group 1 Hydraulic Circuit ------------------------------------------------------------------------------------------------- 3-1

Group 2 Main Circuit --------------------------------------------------------------------------------------------------------- 3-2
Group 3 Pilot Circuit ---------------------------------------------------------------------------------------------------------- 3-5
Group 4 Single Operation ------------------------------------------------------------------------------------------------ 3-14
Group 5 Combined Operation ----------------------------------------------------------------------------------------- 3-29

SECTION 4 ELECTRICAL SYSTEM

Group 1 Component Location ----------------------------------------------------------------------------------------- 4-1

Group 2 Electrical Circuit ------------------------------------------------------------------------------------------------- 4-3
Group 3 Electrical Component Specification ----------------------------------------------------------------- 4-24
Group 4 Connectors --------------------------------------------------------------------------------------------------------- 4-32

SECTION 5 MECHATRONICS SYSTEM

Group 1 Outline ------------------------------------------------------------------------------------------------------------------ 5-1

Group 2 Mode selection System ---------------------------------------------------------------------------------------- 5-3
Group 3 Automatic Deceleration System --------------------------------------------------------------------------- 5-6
 Group 4 Power Boost System ----------------------------------------------------------------------------------------- 5-7
Group 5 Travel Speed Control System ---------------------------------------------------------------------------- 5-8
Group 6 Automatic Warming Up Function ---------------------------------------------------------------------- 5-9
Group 7 Engine Overheat Prevention Function -------------------------------------------------------------- 5-10
Group 8 Variable Power Control System --------------------------------------------------------------------- 5-11
Group 9 Attachment Flow Control System ------------------------------------------------------------------ 5-12
Group 10 Anti-Restart System ---------------------------------------------------------------------------------------- 5-13
Group 11 Self-Diagnostic System ---------------------------------------------------------------------------------- 5-14
Group 12 Engine Control System ----------------------------------------------------------------------------------- 5-27
Group 13 EPPR Valve ----------------------------------------------------------------------------------------------------- 5-28
Group 14 Monitoring System ------------------------------------------------------------------------------------------ 5-33
Group 15 Fuel Warmer System -------------------------------------------------------------------------------------- 5-56

SECTION 6 TROUBLESHOOTING

Group 1 Before Troubleshooting ----------------------------------------------------------------------------------- 6-1

Group 2 Hydraulic and Mechanical System ---------------------------------------------------------------- 6-4
Group 3 Electrical System --------------------------------------------------------------------------------------------- 6-25
Group 4 Mechatronics System ------------------------------------------------------------------------------------- 6-41

SECTION 7 MAINTENANCE STANDARD

Group 1 Operational Performance Test ------------------------------------------------------------------------ 7-1

Group 2 Major Components ------------------------------------------------------------------------------------------ 7-19
Group 3 Track and Work Equipment ----------------------------------------------------------------------------- 7-28

SECTION 8 DISASSEMBLY AND ASSEMBLY

Group 1 Precaution -------------------------------------------------------------------------------------------------------- 8-1

Group 2 Tightening Torque -------------------------------------------------------------------------------------------- 8-4
Group 3 Pump Device --------------------------------------------------------------------------------------------------- 8-7
Group 4 Main Control Valve ------------------------------------------------------------------------------------------ 8-30
Group 5 Swing Device --------------------------------------------------------------------------------------------------- 8-44
Group 6 Travel Motor ------------------------------------------------------------------------------------------------------ 8-65
Group 7 Transmission ---------------------------------------------------------------------------------------------------- 8-89
Group 8 Steering Valve -------------------------------------------------------------------------------------------------- 8-143
Group 9 Front Axle and Rear Axle ------------------------------------------------------------------------------- 8-168
Group 10 RCV Lever ------------------------------------------------------------------------------------------------------ 8-240
 Group 11 Turning Joint ----------------------------------------------------------------------------------------------------- 8-254
Group 12 Boom, Arm, Bucket, Dozer and Outrigger Cylinders ------------------------------------ 8-260
Group 13 Work Equipment ---------------------------------------------------------------------------------------------- 8-282

SECTION 9 COMPONENT MOUNTING TORQUE

Group 1 Introduction Guide ---------------------------------------------------------------------------------------------- 9-1

Group 2 Engine System --------------------------------------------------------------------------------------------------- 9-2
Group 3 Electric System -------------------------------------------------------------------------------------------------- 9-4
Group 4 Hydraulic System ----------------------------------------------------------------------------------------------- 9-6
Group 5 Power train System -------------------------------------------------------------------------------------------- 9-9
Group 6 Structure ------------------------------------------------------------------------------------------------------------- 9-11
Group 7 Work Equipment ------------------------------------------------------------------------------------------------- 9-15
 SECTION 1 GENERAL

Group 1 Safety Hints -------------------------------------------------------------------------------------------------------- 1-1

Group 2 Specifications ----------------------------------------------------------------------------------------------------- 1-9
 SECTION 1 GENERAL
GROUP 1 SAFETY

FOLLOW SAFE PROCEDURE

Unsafe wor k practices are dangerous.
Understand service procedure before doing
work; do not attempt shortcuts.

WEAR PROTECTIVE CLOTHING

Wear close fitting clothing and safety equipment
appropriate to the job.

13031GE01

WARN OTHERS OF SERVICE WORK

Unexpected machine movement can cause
serious injury.
Before performing any work on the excavator,
attach a 「Do Not Operate」 tag on the right
side control lever.

13031GE02

USE HANDHOLDS AND STEPS

Falling is one of the major causes of personal
injury.
When you get on and off the machine, always
maintain a three point contact with the steps
and handrails and face the machine. Do not use
any controls as handholds.
Never jump on or off the machine. Never mount
or dismount a moving machine.
Be careful of slippery conditions on platforms, 13031GE03

steps, and handrails when leaving the machine.

1-1
PREPARE FOR EMERGENCIES
Be prepared if a fire starts.
Keep a first aid kit and fire extinguisher handy.
Keep emergency numbers for doctors,
ambulance ser vice, hospital, and fire
department near your telephone.

13031GE04

PROTECT AGAINST FLYING DEBRIS

Guard against injury from flying pieces of metal
or debris; wear goggles or safety glasses.

13031GE05

PROTECT AGAINST NOISE

Prolonged exposure to loud noise can cause
impairment or loss of hearing.
Wear a suitable hearing protective device such
as ear-
muffs or ear plugs to protect against
objectionable or uncomfortable loud noises.

13031GE06

AVOID POWER LINES

Serious injury or death can result from contact
with electric lines.
Never move any part of the machine or load
closer to electric line than 3m(10ft) plus twice the
line insulator length.

14W7A1GE07

1-2
KEEP RIDERS OFF EXCAVATOR
Only allow the operator on the excavator. Keep
riders off.
Riders on excavator are subject to injury such
as being struck by foreign objects and being
thrown off the excavator. Riders also obstruct
the operator's view resulting in the excavator
being operated in an unsafe manner.
14W7A1GE08

MOVE AND OPERATE MACHINE SAFELY

Bystanders can be run over. Know the location
of bystanders before moving, swinging, or
operating the machine.
Always keep the travel alarm in working
condition. It warns people when the excavator
starts to move.
Use a signal person when moving, swinging, or
operating the machine in congested areas. 14W7A1GE09

Coordinate hand signals before starting the

excavator.

OPERATE ONLY FORM OPERATOR'S SEAT

Avoid possible injury machine damage. Do not
star t engine by shor ting across star ter
terminals.
NEVER start engine while standing on ground.
Start engine only from operator's seat.

13031GE26

PARK MACHINE SAFELY

Before working on the machine:
·Park machine on a level surface.
·Lower bucket to the ground.
·Turn auto idle switch off.
·Run engine at 1/2 speed without load for 2
minutes.
·Turn key switch to OFF to stop engine.
Remove key from switch.
·Move pilot control shutoff lever to locked
position.
·Allow engine to cool.

1-3
SUPPORT MACHINE PROPERLY
Always lower the attachment or implement to
the ground before you work on the machine. If
you must wor k on a lifted machine or
attachment, securely support the machine or
attachment.
Do not support the machine on cinder blocks,
hollow tiles, or props that may crumble under
continuous load.
13031GE10
Do not work under a machine that is supported
solely by a jack. Follow recommended
procedures in this manual.

SERVICE COOLING SYSTEM SAFELY

Explosive release of fluids from pressurized
cooling system can cause serious burns.
Shut off engine. Only remove filler cap when
cool enough to touch with bare hands.

13031GE11

HANDLE FLUIDS SAFELY-AVOID FIRES

Handle fuel with care; it is highly flammable. Do
not refuel the machine while smoking or when
near open flame or sparks. Always stop engine
before refueling machine.
Fill fuel tank outdoors.

13031GE12

Store flammable fluids away from fire hazards.

Do not incinerate or puncture pressurized
containers.
Make sure machine is clean of trash, grease,
and debris.
Do not store oily rags ; they can ignite and burn
spontaneously.

13031GE13

1-4
BEWARE OF EXHAUST FUMES
Prevent asphyxiation. Engine exhaust fumes
can cause sickness or death.
If you must operate in a building, be positive
there is adequate ventilation. Either use an
exhaust pipe extension to remove the exhaust
fumes or open doors and windows to bring
enough outside air into the area.

REMOVE PAINT BEFORE WELDING OR

HEATING
Avoid potentially toxic fumes and dust.
Hazardous fumes can be generated when paint
is heated by welding, soldering, or using a torch.
Do all work outside or in a well ventilated area.
Dispose of paint and solvent properly.
Remove paint before welding or heating:
·If you sand or grind paint, avoid breathing the
dust.
Wear an approved respirator.
·If you use solvent or paint stripper, remove
stripper with soap and water before welding.
Remove solvent or paint stripper containers 13031GE14

and other flammable material from area.

Allow fumes to disperse at least 15 minutes
before welding or heating.

ILLUMINATE WORK AREA SAFELY

Illuminate your work area adequately but safely.
Use a portable safety light for working inside or
under the machine. Make sure the bulb is
enclosed by a wire cage. The hot filament of an
accidentally broken bulb can ignite spilled fuel
or oil.

13031GE15

1-5
SERVICE MACHINE SAFELY
Tie long hair behind your head. Do not wear a
necktie, scarf, loose clothing or necklace when
you work near machine tools or moving parts. If
these items were to get caught, severe injury
could result.
Remove rings and other jewelry to prevent
electrical shorts and entanglement in moving
parts.
13031GE16

STAY CLEAR OF MOVING PARTS

Entanglements in moving parts can cause
serious injury.
To prevent accidents, use care when working
around rotating parts.

13031GE17

AVOID HIGH PRESSURE FLUIDS

Escaping fluid under pressure can penetrate the
skin causing serious injury.
Avoid the hazard by relieving pressure before
disconnecting hydraulic or other lines. Tighten
all connections before applying pressure.
Search for leaks with a piece of cardboard.
Protect hands and body from high pressure
fluids. 13031GE18

If an accident occurs, see a doctor immediately.

Any fluid injected into the skin must be
surgically removed within a few hours or
gangrene may result.

13031GE19

1-6
AVOID HEATING NEAR PRESSURIZED
FLUID LINES
Flammable spray can be generated by heating
near pressurized fluid lines, resulting in severe
burns to yourself and bystanders. Do not heat
by welding, soldering, or using a torch near
pressurized fluid lines or other flammable
materials.
Pressurized lines can be accidentally cut when
13031GE20
heat goes beyond the immediate flame area.
Install fire resisting guards to protect hoses or
other materials.

PREVENT BATTERY EXPLOSIONS

Keep sparks, lighted matches, and flame away
from the top of battery. Battery gas can
explode.
Never check battery charge by placing a metal
object across the posts. Use a volt-meter or
hydrometer.
Do not charge a frozen battery; it may explode.
Warm battery to 16˚C (60˚F). 13031GE21

PREVENT ACID BURNS

Sulfuric acid in battery electrolyte is poisonous.
It is strong enough to burn skin, eat holes in
clothing, and cause blindness if splashed into
eyes.
Avoid the hazard by:
1. Filling batteries in a well-ventilated area.
2. Wearing eye protection and rubber gloves.
3. Avoiding breathing fumes when electrolyte is
added.
4. Avoiding spilling of dripping electrolyte.
5. Use proper jump start procedure.
If you spill acid on yourself:
1. Flush your skin with water.
2. Apply baking soda or lime to help neutralize
the acid.
3. Flush your eyes with water for 10-15
minutes. Get medical attention immediately.
If acid is swallowed:
1. Drink large amounts of water or milk.
2. Then drink milk of magnesia, beaten eggs, 13031GE22

or vegetable oil.
3. Get medical attention immediately.

1-7
USE TOOLS PROPERLY
Use tools appropriate to the work. Makeshift
tools, parts, and procedures can create safety
hazards.
Use power tools only to loosen threaded tools
and fasteners.
For loosening and tightening hardware, use the
correct size tools. DO NOT use U.S.
measurement tools on metric fasteners. Avoid
bodily injury caused by slipping wrenches.
13031GE23
Use only recommended replacement parts.
(See Parts manual.)

DISPOSE OF FLUIDS PROPERLY

Improperly disposing of fluids can harm the
environment and ecology. Before draining any
fluids, find out the proper way to dispose of
waste from your local environmental agency.
Use proper containers when draining fluids. Do
not use food or beverage containers that may
mislead someone into drinking from them.
DO NOT pour oil into the ground, down a drain,
or into a stream, pond, or lake. Observe
relevant environmental protection regulations 13031GE24

when disposing of oil, fuel, coolant, brake fluid,

filters, batteries, and other harmful waste.

REPLACE SAFETY SIGNS

Replace missing or damaged safety signs. See
the machine operator's manual for correct
safety sign placement.

13031GE25

LIVE WITH SAFETY

Before returning machine to customer, make
sure machine is functioning properly, especially
the safety systems. Install all guards and
shields.

1-8
GROUP 2 SPECIFICATIONS

1. MAJOR COMPONENT

Tooth Bucket Battery box Fuel tank Hydraulic tank Main pump

Engine

Radiator

Oil cooler

Tire Turning joint Swing motor Main control valve

Arm Arm cylinder Boom Boom cylinder Cab Muffler Counterweight

Dozer cylinder

Dozer blade

Bucket cylinder Connecting rod Front axle Travel motor Tool box Rear axle

Connecting link Side cutter Front drive shaft Transmission Rear drive shaft

14W9S2SP01

1-9
2. SPECIFICATIONS
1) 4.6 m (15' 1") ONE PIECE BOOM, 2.1 m (6' 11") ARM AND REAR DOZER BLADE

I(I') D
C

E
G
F
H
J K
A B(L)

14W9S2SP02

Description Unit Specification

Operating weight kg (lb) 13700 (30200)
Bucket capacity (SAE heaped), standard m3 (yd3) 0.58 (0.76)
Overall length A 7760 (25' 6")
Overall width B 2500 ( 8' 2")
Overall height C 3500 (11' 6")
Upperstructure width D 2475 ( 8' 1")
Cab height E 3140 (10' 4")
Ground clearance of counterweight F 1210 ( 4' 0")
Engine cover height G mm (ft-in) 2320 ( 7' 7")
Minimum ground clearance H 397 ( 1' 4")
Rear-end distance I 2330 ( 7' 8")
Rear-end swing radius I' 2330 ( 7' 8")
Wheel base J 2600 ( 8' 6")
Tread K 1944 ( 6' 5")
Dozer blade width L 2490 ( 8' 2")
Low 8 (5.0)
Travel speed High km/hr (mph) 30 (18.6)
Creep 3.5 (2.2)
Swing speed rpm 12.9
Gradeability Degree (%) 35 (70)
Max traction force kgf (lbf) 8500 (18740)

1-10
3. WORKING RANGE
1) 4.6 m (15' 1") MONO BOOM
A
A'
F

D
B' E
C
B

8ft
14W92SP03

Description 1.9 m (6' 3") Arm *2.1 m (6' 11") Arm 2.5 m (8' 2") Arm 3.0 m (9' 10") Arm
Max digging reach A 7750 mm (25' 5") 7920 mm (26' 0") 8320 mm (27' 4") 8780 mm (28'10")
Max digging reach on ground A' 7530 mm (24' 8") 7700 mm (25' 3") 8120 mm (26' 8") 8590 mm (28' 2")
Max digging depth B 4650 mm (15' 3") 4850 mm (15'11") 5250 mm (17' 3") 5750 mm (18'10")
Max digging depth (8 ft level) B' 4390 mm (14' 5") 4600 mm (15' 1") 5040 mm (16' 6") 5570 mm (18' 3")
Max vertical wall digging depth C 4350 mm (14' 3") 4350 mm (14' 3") 5030 mm (16' 6") 5550 mm (18' 3")
Max digging height D 8400 mm (27' 7") 8470 mm (27' 9") 8790 mm (28'10") 9070 mm (29' 9")
Max dumping height E 5960 mm (19' 7") 6040 mm (19'10") 6350 mm (20'10") 6620 mm (21' 9")
Min swing radius F 2620 mm ( 8' 7") 2620 mm ( 8' 7") 2650 mm ( 8' 8") 2670 mm ( 8' 9")
87.3 [94.8] kN 87.3 [94.8] kN 87.3 [94.8] kN 87.3 [94.8] kN
SAE 8800 [9660] kgf 8800 [9660] kgf 8800 [9660] kgf 8800 [9660] kgf
19620 [21300] lbf 19620 [21300] lbf 19620 [21300] lbf 19620 [21300] lbf
Bucket digging force
102 [110.8] kN 102 [110.8] kN 102 [110.8] kN 102 [110.8] kN
ISO 10400 [11290] kgf 10400 [11290] kgf 10400 [11290] kgf 10400 [11290] kgf
22930 [24890] lbf 22930 [24890] lbf 22930 [24890] lbf 22930 [24890] lbf
76.5 [83.1] kN 73.6 [79.9] kN 62.8 [68.2] kN 55.9 [60.7] kN
SAE 7800 [8470] kgf 7500 [8140] kgf 6400 [6950] kgf 5700 [6190] kgf
17200 [18670] lbf 16530 [17950] lbf 14110 [15320] lbf 12570 [13640] lbf
Arm digging force
80.4 [87.3] kN 77.5 [84.1] kN 65.7 [71.4] kN 57.9 [62.8] kN
ISO 8200 [8900] kgf 7900 [8580] kgf 6700 [7270] kgf 5900 [6410] kgf
18080 [19630] lbf 17420 [18910] lbf 14770 [16040] lbf 13010 [14120] lbf
* : Standard [ ] : Power boost

1-11
4. WEIGHT
R140W-9S
Item
kg lb
Upperstructure assembly 4680 10320
Main frame weld assembly 1150 2540
Engine assembly 330 730
Main pump assembly 100 220
Main control valve assembly 145 320
Swing motor assembly 130 290
Hydraulic oil tank assembly 180 400
Fuel tank assembly 140 310
Counterweight 1900 4190
Cab assembly 500 1100
Lower frame weld assembly 1340 2950
Swing bearing 210 465
Travel motor assembly 65 145
Turning joint 100 220
Transmission assembly 140 310
Front axle assembly 520 1150
Rear axle assembly 480 1060
Dozer blade assembly (front) 590 1300
Dozer blade assembly (rear) 560 1240
Front attachment assembly (4.6 m boom, 2.1 m arm,
2380 5250
0.58 m3 SAE heaped bucket)
4.6 m boom assembly 830 1830
2.1 m arm assembly 385 850
0.58 m3 SAE heaped bucket assembly 480 1060
Boom cylinder assembly 130 290
Arm cylinder assembly 160 350
Bucket cylinder assembly 100 220
Bucket control link assembly 80 180
2.5 m arm assembly 435 960
Oscillating cylinder assembly 30 70
Front outrigger assembly 800 1765
Rear outrigger assembly 790 1740
Outrigger cylinder assembly 110 240
Blade cylinder assembly (front) 45 100
Blade cylinder assembly (rear) 50 110

1-12
5. LIFTING CAPACITIES
1) ROBEX 140W-9S
(1) 4.60 m (15' 1") boom, 2.1 m (6'11") arm equipped with 0.58 m3 (SAE heaped) bucket and rear
dozer blade down.

· : Rating over-front · : Rating over-side or 360 degree

Load radius At max. reach

Load point 1.5 m (5.0 ft) 3.0 m (10.0 ft) 4.5 m (15.0 ft) 6.0 m (20.0 ft) Capacity Reach
height
m (ft)
6.0 m kg *3130 *3130 *3050 1950 6.43
(20.0 ft) lb *6900 *6900 *6720 4300 (21.1)
4.5 m kg *3540 *3540 *3210 2120 *3160 1520 7.23
(15.0 ft) lb *7800 *7800 *7080 4670 *6970 3350 (23.7)
3.0 m kg *6620 6450 *4510 3310 *3770 2040 3230 1340 7.59
(10.0 ft) lb *14590 14220 *9940 7300 *8310 4500 7120 2950 (24.9)
1.5 m kg *8650 5730 *5580 3060 *4230 1930 3180 1300 7.59
(5.0 ft) lb *19070 12630 *12300 3750 *9330 4250 7010 2870 (24.9)
Ground kg *9090 5510 *6240 2900 *4540 1860 3420 1390 7.24
Line lb *20040 12150 *13760 6390 *10010 4100 7540 3060 (23.8)
-1.5 m kg *7380 *7380 *9530 5530 *6240 2860 *3760 1700 6.45
(-5.0 ft) lb *16270 *16270 *21010 12190 *13760 6310 *8290 3750 (21.2)
-3.0 m kg *11710 *11710 *7990 5690 *5240 2950
(-10.0 ft) lb *25820 *25820 *17610 12540 *11550 6500
Note 1. Lifting capacity are based on SAE J1097 and ISO 10567.
2. Lifting capacity of the ROBEX series does not exceed 75% of tipping load with the machine on
firm, level ground or 87% of full hydraulic capacity.
3. The load point is a hook located on the back of the bucket.
4. *Indicates load limited by hydraulic capacity.

(2) 4.60 m (15' 1") boom, 2.5 m (8' 2") arm equipped with 0.58 m3 (SAE heaped) bucket and rear
dozer blade down.
Load radius At max. reach
Load point 1.5 m (5.0 ft) 3.0 m (10.0 ft) 4.5 m (15.0 ft) 6.0 m (20.0 ft) Capacity Reach
height
m (ft)
6.0 m kg *2820 1700 6.92
(20.0 ft) lb *6220 3750 (22.7)
4.5 m kg *3110 *3110 *2980 2150 *2880 1360 7.66
(15.0 ft) lb *6860 *6860 *6570 4740 *6350 3000 (25.1)
3.0 m kg *5700 *5700 *4110 3360 *3500 2050 *2930 1200 8.00
(10.0 ft) lb *12570 *12570 *9060 7410 *7720 4520 *6460 2650 (26.2)
1.5 m kg *8610 5850 *5270 3080 *4030 1930 2900 1160 8.00
(5.0 ft) lb *18980 12900 *11620 6790 *8880 4250 6390 2560 (26.2)
Ground kg *3820 *3820 *9000 5500 *6070 2890 *4430 1830 3090 1240 7.67
Line lb *8420 *8420 *19840 12130 *13380 6370 *9770 4030 6810 2730 (25.2)
-1.5 m kg *6470 *6470 *9740 5460 *6260 2820 *4470 1800 *3510 1480 6.94
(-5.0 ft) lb *14260 *14260 *21470 12040 *13800 6220 *9850 3970 *7740 3260 (22.8)
-3.0 m kg *9750 *9750 *8560 5580 *5620 2870 *3480 2150 5.64
(-10.0 ft) lb *21500 *21500 *18870 12300 *12390 6330 *7670 4740 (18.5)

1-13
8. RECOMMENDED OILS

Use only oils listed below or equivalent.

Do not mix different brand oil.

Service Ambient temperature侽C#(侽F)

Capacity
Kind of fluid -50 -30 -20 -10 0 10 20 30 40
point ˶ (U.S. gal)
(-58) (-22) (-4) (14) (32) (50) (68) (86) (104)
侏SAE 5W-40
Engine
14.5 (3.8)
oil pan SAE 30
Engine oil SAE 10W
Transmission SAE 10W-30
2.5 (0.7)
case
SAE 15W-40

侏SAE 75W-90
Gear oil 2.5 (0.7)
SAE 85W-140
Swing drive
侏NLGI NO.1
Grease 0.35 (0.1)
NLGI NO.2

Center : 9.0 (2.38)

Front axle Hub : 2.4Ý2 (0.63Ý2)
Gear oil SAE 85W-90 LSD or UTTO
Center : 11.2 (2.96)
Rear axle
Hub : 2.4Ý2 (0.63Ý2)

侏ISO VG 15
## Tank:
Hydraulic 124 (32.8) ISO VG 32
Hydraulic oil
tank# System: ISO VG 46
210 (55.5)######
ISO VG 68

侏ASTM D975 NO.1

Fuel tank# Diesel fuel 270 (71.3)
ASTM D975 NO.2

Fitting 侏NLGI NO.1

(Grease Grease As required#
nipple) NLGI NO.2

Mixture of
Radiator Ethylene glycol base permanent type (50 : 50)
antifreeze
(Reservoir 17.5 (4.6)
and soft 侏Ethylene glycol base permanent type (60 : 40)
tank)#
water侏1

SAE : Society of Automotive Engineers #侏#=#Cold region

API : American Petroleum Institute Russia, CIS, Mongolia

ISO : International Organization for Standardization 侏1#=#Soft water
NLGI : National Lubricating Grease Institute
City water or distilled water
ASTM : American Society of Testing and Materia
UTTO : Universal Tractor Transmission Oil
1-20
6. BUCKET SELECTION GUIDE
1) GENERAL BUCKET

0.23 m3 SAE 0.40, 0.46 m3 SAE 0.52, ö0.58, 0.65, 0.71 m3 SAE
heaped bucket heaped bucket heaped bucket

Recommendation
Capacity Width 4.6 m (15' 1")
Weight# Mono boom
SAE CECE Without With 1.9 m arm 2.1 m arm 2.5 m arm 3.0 m arm
heaped heaped side cutter side cutter (6' 3") (6' 11") (8' 2") (9' 10")

0.23 m3 0.20 m3 520 mm 620 mm 335 kg

(0.30 yd3) (0.26 yd3) (20.5") (24.4") (740 lb)

0.40 m3 0.35 m3 760 mm 860 mm 410 kg

(0.52 yd3) (0.46 yd3) (29.9") (33.9") (900 lb)

0.46 m3 0.40 m3 850 mm 950 mm 435 kg

(0.60 yd3) (0.52 yd3) (33.5") (37.4") (960 lb)

0.52 m3 0.45 m3 935 mm 1035 mm 460 kg

(0.68 yd3) (0.59 yd3) (36.8") (40.7") (1010 lb)

ö0.58 m3 0.50 m3 1030 mm 1130 mm 480 kg

(0.76 yd3) (0.65 yd3) (40.6") (44.5") (1060 lb

0.65 m3 0.55 m3 1110 mm 1210 mm 500 kg

(0.85 yd3) (0.72 yd3) (43.7") (47.6") (1100 lb)

0.71 m3 0.60 m3 1205 mm 1305 mm 540 kg

(0.93 yd3) (0.78 yd3) (47.4") (51.4") (1190 lb)

ö
: Standard bucket

Applicable for materials with density of 2000 kg/m3 (3370 lb/yd3) or less
Applicable for materials with density of 1600 kg/m3 (2700 lb/yd3) or less
Applicable for materials with density of 1100 kg/m3 (1850 lb/yd3) or less

1-14
 2) Special bucket
Slope finishing bucket Ditch cleaning bucket

侒#0.55 m3 SAE ø
0.45 m3 SAE

heaped bucket heaped bucket

Recommendation
Capacity Width 4.6 m (15' 1")
Weight Mono boom
SAE CECE Without With 1.9 m arm 2.1 m arm 2.5 m arm
heaped heaped side cutter side cutter (6' 3") (6' 11") (8' 2")

侒 0.55 m3 0.45 m3 1800 mm 585 kg

-
(0.72 yd3) (0.59 yd3) (70.9") (1290 lb)

ø 0.45 m3 0.40 m3 1520 mm 410 kg

-
(0.59 yd3) (0.52 yd3) (59.8") (900 lb)

侒
: Slope finishing bucket

ø
: Ditch cleaning bucket

Applicable for materials with density of 2000 kg/m3 (3370 lb/yd3) or less
Applicable for materials with density of 1600 kg/m3 (2700 lb/yd3) or less
Applicable for materials with density of 1100 kg/m3 (1850 lb/yd3) or less

1-15
7. SPECIFICATIONS FOR MAJOR COMPONENTS
1) ENGINE
Item Specification
Model Cummins B 3.9
Type 4-cycle turbocharged diesel engine, low emission
Cooling method Water cooling
Number of cylinders and arrangement 4 cylinders, in-line
Firing order 1-3-4-2
Combustion chamber type Direct injection type
Cylinder boreÝstroke 102Ý120 mm (4.02Ý4.72)
Piston displacement 3900 cc (238 cu in)
Compression ratio 18 : 1
Rated gross horse power (SAE J1995) 113 Hp (84 kW) at 2100 rpm
Maximum torque 45.6 kgfÂm (330 lbfÂft) at 1500 rpm
Engine oil quantity 15.3˶ (4.0 U.S. gal)
Dry weight 320 kg (705 lb)
High idling speed 2350Ü50 rpm
Low idling speed 850Ü100 rpm
Rated fuel consumption 164 g/HpÂhr at 2100 rpm
Starting motor Nippon densor (24 V - 4.5 kW)
Alternator Delco remy (24 V - 70 A)
Battery 2Ý12 VÝ100 Ah

2) MAIN PUMP
Item Specification
Type Variable displacement tandem axis piston pumps
Capacity 2Ý62 cc/rev
Maximum pressure 350 kgf/cm2 (4980 psi) [380 kgf/cm2 (5400 psi)]
Rated oil flow 2Ý130˶/min (34.3 U.S. gpm / 28.6 U.K. gpm)
Rated speed 2100 rpm
[ ]: Power boost

1-16
 3) GEAR PUMP
Item Specification
Type Fixed displacement gear pump single stage
Capacity 15cc/rev
Maximum pressure 40 kgf/cm2 (570 psi)
Rated oil flow 31.5ℓ/min (8.3 U.S. gpm/6.9 U.K. gpm)

4) MAIN CONTROL VALVE

Item Specification
Type 11 spools two-block
Operating method Hydraulic pilot system
Main relief valve pressure 350 kgf/cm2 (4980 psi) [380 kgf/cm2 (5400 psi)]
Overload relief valve pressure 400 kgf/cm2 (5690 psi)
[ ]: Power boost

5) SWING MOTOR
Item Specification
Type Fixed displacement axial piston motor
Capacity 72 cc/rev
Relief pressure 260 kgf/cm2(3698 psi) -#0031, 280 kgf/cm2(4050 psi) #0032-
Braking system Automatic, spring applied hydraulic released
Braking torque 30 kgf·m (217 lbf·ft)
Brake release pressure 15~50 kgf/cm2 (213~711 psi)
Reduction gear type 2 - stage planetary

6) TRAVEL MOTOR

Item Specification
Type Variable displacement bent-axis axial piston motor
Relief pressure 380 kgf/cm2 (5400 psi)
Counter balance valve Applied
Capacity (MAX/MIN) 107 / 43 cc/rev

1-17
 7) POWER TRAIN
Item# Description Specification
Type 2 speed power shift transmission
Transmission 1st 4.87
Gear ratio
2nd 1.20
Type Multi disc brake integrated in transmission
Parking brake
Maximum braking torque 2124 kgfÂm (15360 lbfÂft)
Type 4 wheel drive with differential
Axle Gear ratio 15.43
Brake Multi disc brake

8) CYLINDER
Item Specification
Bore diaÝStroke ͚105Ý1075mm
Boom cylinder
Cushion Extend only
Bore diaÝStroke ͚115Ý1138mm
Arm cylinder
Cushion Extend and retract
Bore diaÝStroke ͚100Ý840mm
Bucket cylinder
Cushion Extend only
Rear Bore diaÝStroke ͚100Ý236mm
Dozer cylinder
Front Bore diaÝStroke ͚100Ý240mm
Cushion Extend only
Outrigger cylinder Bore diaÝStroke ͚110Ý446mm

1-18
 9) BUCKET
Capacity Tooth Width
Item
SAE heaped CECE heaped quantity Without side cutter With side cutter
Standard

0.58 m3 (0.76 yd3) 0.50 m3 (0.65 yd3) 5 1030 mm (40.6") 1130 mm (44.5")

0.23 m3 (0.30 yd3) 0.20 m3 (0.26 yd3) 3 520 mm (20.5") 620 mm (24.4")

0.40 m3 (0.52 yd3) 0.35 m3 (0.46 yd3) 4 760 mm (29.9") 860 mm (33.9")

0.46 m3 (0.60 yd3) 0.40 m3 (0.52 yd3) 4 850 mm (33.5") 950 mm (37.4")



0.52 m3 (0.68 yd3) 0.45 m3 (0.59 yd3) 5 935 mm (36.8") 1035 mm (40.7")
Option



0.65 m3 (0.85 yd3)
0.55 m3 (0.72 yd3) 5 1110 mm (43.7") 1210 mm (47.6")

0.71 m3 (0.93 yd3) 0.60 m3 (0.78 yd3) 5 1205 mm (47.4") 1305 mm (51.4")
侒#0.55 m3 (0.72 yd3) 0.45 m3 (0.59 yd3) - 1800 mm (70.9") -
ø#0.45 m3 (0.59 yd3) 0.40 m3 (0.52 yd3) - 1520 mm (59.8") -
侒
: Slope finishing bucket
ø
: Ditch cleaning bucket

1-19
8. RECOMMENDED OILS

Use only oils listed below or equivalent.

Do not mix different brand oil.

Service Ambient temperature侽C#(侽F)

Capacity
Kind of fluid -50 -30 -20 -10 0 10 20 30 40
point ˶ (U.S. gal)
(-58) (-22) (-4) (14) (32) (50) (68) (86) (104)
侏SAE 5W-40
Engine
14.5 (3.8)
oil pan SAE 30
Engine oil SAE 10W
Transmission SAE 10W-30
2.5 (0.7)
case
SAE 15W-40

侏SAE 75W-90
Gear oil 2.5 (0.7)
SAE 85W-140
Swing drive
侏NLGI NO.1
Grease 0.35 (0.1)
NLGI NO.2

Center : 9.0 (2.38)

Front axle Hub : 2.4Ý2 (0.63Ý2)
Gear oil SAE 85W-90 LSD or UTTO
Center : 11.2 (2.96)
Rear axle
Hub : 2.4Ý2 (0.63Ý2)

侏ISO VG 15
## Tank:
Hydraulic 124 (32.8) ISO VG 32
Hydraulic oil
tank# System: ISO VG 46
210 (55.5)######
ISO VG 68

侏ASTM D975 NO.1

Fuel tank# Diesel fuel 270 (71.3)
ASTM D975 NO.2

Fitting 侏NLGI NO.1

(Grease Grease As required#
nipple) NLGI NO.2

Mixture of
Radiator Ethylene glycol base permanent type (50 : 50)
antifreeze
(Reservoir 17.5 (4.6)
and soft 侏Ethylene glycol base permanent type (60 : 40)
tank)#
water侏1

SAE : Society of Automotive Engineers #侏#=#Cold region

API : American Petroleum Institute Russia, CIS, Mongolia

ISO : International Organization for Standardization 侏1#=#Soft water
NLGI : National Lubricating Grease Institute
City water or distilled water
ASTM : American Society of Testing and Materia
UTTO : Universal Tractor Transmission Oil
1-20
 SECTION 2 STRUCTURE AND FUNCTION

Group 1 Pump Device ------------------------------------------------------------------------------------------------------ 2-1

Group 2 Main Control Valve --------------------------------------------------------------------------------------------- 2-20
Group 3 Swing Device ------------------------------------------------------------------------------------------------------ 2-47
Group 4 Travel Motor -------------------------------------------------------------------------------------------------------- 2-59
Group 5 RCV Lever ---------------------------------------------------------------------------------------------------------- 2-65
Group 6 Accelerator Pedal ----------------------------------------------------------------------------------------------- 2-72
Group 7 Brake Pedal -------------------------------------------------------------------------------------------------------- 2-73
Group 8 Transmission ------------------------------------------------------------------------------------------------------- 2-74
Group 9 Travel Control Valve -------------------------------------------------------------------------------------------- 2-82
Group 10 Steering Valve ---------------------------------------------------------------------------------------------------- 2-84
 SECTION 2 STRUCTURE AND FUNCTION
GROUP 1 PUMP DEVICE

1. STRUCTURE
The pump device consists of main pump, regulator and gear pump.

Dr3 Gear pump

B3 Dr1
a4
A3
Qmax adjusting screw

EPPR valve
Pi1
a3
P1

Dr2 Pi2

Qmin adjusting screw Qmin adjusting screw

Front regulator Rear regulator

Pi1 Pi2

B1

a1 a2

Dr2
B1
A2
A1

VIEW A
A1 A2
Front pump Valve block Rear pump
14W92MP01
A
A1 A2
Port Port name Port size
FRONT a1 a2 REAR
A1,2 Delivery port SAE6000psi 3/4"
B1 Suction port SAE2500psi 2 1/2"
Dr1 Drain port PF 3/4 - 20
Dr2 Drain port PF 1/2 - 19
Pi1 Pi2 Dr3 Drain port PF 3/8 - 15
Pi1, i2 Pilot port PF 1/4 - 15
a3
B1
P1 EPPR valve primary port PF 1/4 - 15
Dr2 Dr1 P1
a1,2,3 Gauge port PF 1/4 - 15
a4 a4 Gauge port PF 1/4 - 14
A3 Dr3 B3 A3 Gear pump delivery port PF 1/2 - 19
Hydraulic circuit B3 Gear pump suction port PF 3/4 - 20.5

2-1
 1) MAIN PUMP (1/2)
The main pump consists of two piston pumps(front & rear) and valve block.

548
535 789 732 532 531 214 702 792 901 711 312 719 124 151 152 113 406
808 534 808
953 724 954
886
717
406
710
774
111

262
261
127 406
123
710
824
251
490 212 211 153 156 157 467 313 468 466 116 885 314 141 981 271 401
728 727 725 983
14W72SF02

111 Drive shaft (F) 312 Valve block 724 O-ring

113 Drive shaft (R) 313 Valve plate (R) 725 O-ring
116 Gear 314 Valve plate (L) 727 O-ring
123 Roller bearing 401 Hexagon socket bolt 728 O-ring
124 Needle bearing 406 Hexagon socket bolt 732 O-ring
127 Bearing spacer 466 VP Plug 774 Oil seal
141 Cylinder block 467 VP Plug 789 Back up ring
151 Piston 468 VP Plug 792 Back up ring
152 Shoe 490 Plug 808 Hexagon head nut
153 Push-plate 531 Tilting pin 824 Snap ring
156 Bushing 532 Servo piston 885 Pin
157 Cylinder spring 534 Stopper (L) 886 Spring pin
211 Shoe plate 535 Stopper (S) 901 Eye bolt
212 Swash plate 548 Pin 953 Set screw
214 Bushing 702 O-ring 954 Set screw
251 Support 710 O-ring 981 Plate
261 Seal cover (F) 711 O-ring 983 Pin
262 Seal cover (R) 717 O-ring
271 Pump casing 719 O-ring

2-2
 MAIN PUMP (2/2)

04 284 710 825 468 728

711
125
118
117
414
326
886
126
435
262
128
115
885
826

FRONT SIDE REAR SIDE

14W92MP03

04 Gear pump 262 Cover 711 O-ring

115 Shaft 284 Plate 728 O-ring
117 Gear No. 2 326 Gear case 825 Retainer ring
118 Gear No. 3 414 Screw 826 Retainer ring
125 Ball bearing 435 Hexagon socket bolt 885 Spring pin
126 Roller bearing 468 Plug 886 Pin
128 Bearing spacer 710 O-ring

2-3
2) REGULATOR (1/2)

412 876 874 755

A
B 858 438
897 614
612

C
615 Pi
613
875
611
A
B
641 730 643 708 644 645 646 728 924 801
SECTION B-B

735 413 438 405 413 438

656
D

438

Pi Pi

722 D

496 724 725 436 699 496 724 725 436

VIEW C (FRONT) VIEW C (REAR)

KR38-9N37 (FRONT) A
079 735 722 466 KR38-9N35 (REAR)
Port Port name Port size
P1 P2
A Delivery port 3/4"
B Suction port 2 1/2"
Pi Pilot port PF 1/4-15
a Pi P1 EPPR valve primary port PF 1/4-15
P2 Companion delivery port Internal
753 496 755 a a Gauge port PF 1/4-15
SECTION D-D(REAR)
P1
B
14W92MP04

2-4
 REGULATOR (2/2)

655 734 653 654 836 651 652 601 624 629 630 628 802

641

814

898

631
732

733

622

621 623 625 626 887 763 756 754 627

SECTION A-A
14W92MP05

079 EPPR valve assembly 629 Cover (C) 733 O-ring

405 Hexagon socket screw 630 Lock nut 734 O-ring
412 Hexagon socket screw 631 Sleeve, Pf 735 O-ring
413 Hexagon socket screw 641 Pilot cover 753 O-ring
436 Hexagon socket screw 643 Pilot piston 754 O-ring
438 Hexagon socket screw 644 Spring seat (Q) 755 O-ring
466 Plug 645 Adjust stem (Q) 756 O-ring
496 Plug 646 Pilot spring 763 O-ring
601 Casing 651 Sleeve 801 Nut
611 Feed back lever 652 Spool 802 Nut
612 Lever (1) 653 Spring seat 814 Snap ring
613 Lever (2) 654 Return spring 836 Snap ring
614 Fulcrum plug 655 Set spring 858 Snap ring
615 Adjust plug 656 Block cover 874 Pin
621 Compensator piston 699 Valve casing 875 Pin
622 Piston case 708 O-ring 876 Pin
623 Compensator rod 722 O-ring 887 Pin
624 Spring seat (C) 724 O-ring 897 Pin
625 Outer spring 725 O-ring 898 Pin
626 Inner spring 728 O-ring 924 Set screw
627 Adjust stem (C) 730 O-ring
628 Adjust screw (C) 732 O-ring

2-5
3) GEAR PUMP

435
887 433
700 353 351 434

B3
354

311

A3
312 850
732 355
Dr3 Dr3
709 361 a3

307 310 308 309 434 466,725

14W7A2MP06

307 Poppet 353 Drive gear 466 Plug

308 Seat 354 Driven gear 700 Ring
309 Spring seat 355 Filter 709 O-ring
310 Spring 361 Front case 725 O-ring
311 Screw 433 Flange socket 732 O-ring
312 Nut 434 Flange socket 850 Snap ring
351 Gear case 435 Flange socket 887 Pin

2-6
2. FUNCTION
1) MAIN PUMP
The pumps may classified roughly into the rotary group performing a rotary motion and working as
the major part of the whole pump function: the swash plate group that varies the delivery rates: and
the valve cover group that changes over oil suction and discharge.

(1) Rotary group

The rotary group consists of drive shaft
(F) (111), cylinder block (141), piston
shoes (151,152), set plate (153),
spherical bushing (156) and cylinder
124
spring (157). 313
The drive shaft is supported by bearing 141

(123,124) at its both ends. 156

153
The shoe is caulked to the piston to from 211
157
a spherical coupling. It has a pocket to 111 151
relieve thrust force generated by loading 152
123
pressure and the take hydraulic balance
so that it slides lightly over the shoe plate
(211). The sub group composed by a
piston and a shoe is pressed against the 21092MP06

shoe plate by the action of the cylinder

spring via a retainer and a spherical
bush.
Similarly, the cylinder block is pressed
against valve plate (313) by the action of
the cylinder spring. 531
548
(2) Swash plate group 214
The swash plate group consists of swash
plate (212), shoe plate (211), swash plate 251
support (251), tilting bush (214), tilting pin 211
(531) and servo piston (532). 212
The swash plate is a cylindrical part
formed on the opposite side of the sliding
surface of the shoe and is supported by 532 α
the swash support.
If the servo piston moves to the right and
left as hydraulic force controlled by the α
regulator is admitted to hydraulic
chamber located on both sides of the
servo piston, the swash plate slides over
the swash plate support via the spherical
part of the tilting pin to change the tilting
angle (α) 2507A2MP14

2-7
(3) Valve block group
The valve block group consists of valve
block (312), valve plate (313) and valve
plate pin (885). 312
The valve plate having two melon-
313
shaped ports is fixed to the valve block
and feeds and collects oil to and from the
cylinder block. 885
The oil changed over by the valve plate is
21092MP07
connected to an external pipeline by way
of the valve block.
Now, if the drive shaft is driven by a
prime mover (electric motor, engine, etc),
it rotates the cylinder block via a spline
linkage at the same time. If the swash
plate is tilted as in Fig (previous page)
the pistons arranged in the cylinder block
make a reciprocating motion with respect
to the cylinder block, while they revolve
with the cylinder block.
If you pay attention to a single piston, it
performs a motion away from the valve
plate (oil sucking process) within 180
degrees, and makes a motion towards
the valve plate (or oil discharging
process) in the rest of 180 degrees.
When the swash plate has a tilting angle
of zero, the piston makes no stroke and
discharges no oil.

2-8
2) REGULATOR
Regulator consists of the negative flow control, total horse power control and power shift control
function.

(1) Negative flow control

By changing the pilot pressure Pi, the
pump tilting angle (delivery flow) is
regulated arbitrarily, as shown in the
figure.
This regulator is of the negative flow

Delivery flow, Q
control in which the delivery flow Q
decreases as the pilot pressure Pi rises.
With this mechanism, when the pilot
pressure corresponding to the flow
required for the work is commanded, the
pump discharges the required flow only,
and so it does not consume the power Pilot pressure, Pi
uselessly.

2-9
① Flow reducing function

643 654 651 652 613 646

P1 CL
B(E)
874
897
C
Pi(From MCV)
A

875

611

Large diameter Servo piston Small diameter

chamber 548 chamber

D 531

14W92MP12

As the pilot pressure Pi rises, the pilot piston (643) moves to the right to a position where the
force of the pilot spring (646) balances with the hydraulic force.
The groove (A) in the pilot piston is fitted with the pin (875) that is fixed to lever 2 (613).
Therefore, when the pilot piston moves, lever 2 rotates around the fulcrum of point B [fixed by
the fulcrum plug (614) and pin (875)]. Since the large hole section (C) of lever 2 contains a
protruding pin (897) fixed to the feedback lever (611), the pin (897) moves to the right as lever 2
rotates. Since the opposing-flat section (D) of the feedback lever is fitted with the pin (548) fixed
by the tilting pin (531) that swings the swash plate, the feedback lever rotates around the fulcrum
of point D, as the pin (897) moves.
Since the feedback lever is connected with the spool (652) via the pin (874), the spool moves to
the right.
The movement of the spool causes the delivery pressure P1 to connect to port CL through the
spool and to be admitted to the large diameter section of the servo piston. The delivery pressure
P1 that is constantly admitted to the small diameter section of the servo piston moves the servo
piston to the right due to the area difference, resulting in decrease of the tilting angle.
When the servo piston moves to the right, point D also moves to the right. The spool is fitted
with the return spring (654) and is tensioned to the left at all times, and so the pin (897) is
pressed against the large hole section (C) of lever 2.
Therefore, as point D moves, the feedback lever rotates around the fulcrum of point C, and the
spool is shifted to the left. This causes the opening between the sleeve (651) and spool (652) to
close slowly, and the servo piston comes to a complete stop when it closes completely.

2-10
② Flow increasing function

643 654 651 652 613 646

P1 CL
B(E)
874
897
C
Pi(From MCV)
A

875

611

Large diameter Servo piston Small diameter

chamber 548 chamber

D 531

14W92MP13

As the pilot pressure Pi decreases, the pilot piston (643) moves to the left by the action of the
pilot spring (646) and causes lever 2 (613) to rotate around the fulcrum of point B. Since the pin
(897) is pressed against the large hole section (C) of lever 2 by the action of the return spring
(654) via the spool (652), pin (874), and feedback lever (611), the feedback lever rotates around
the fulcrum of point D as lever 2 rotates, and shifts the spool to the left. Port CL opens a way to
the tank port as the spool moves. This deprives the large diameter section of the servo piston of
pressure, and shifts the servo piston to the left by the discharge pressure P1 in the small
diameter section, resulting in an increase in the flow rate.
As the servo piston moves, point D also moves to the left, the feedback lever rotates around the
fulcrum of point C, and the spool moves to the right till the opening between the spool and sleeve
is closed.

2-11
③ Adjustment of flow control characteristic
The flow control characteristic can be
adjusted with the adjusting screw.
Adjust it by loosening the hexagon nut 801
(801) and by tightening (or loosening) 924
the hexagonal socket head screw (924).
Tightening the screw shifts the control
chart to the right as shown in the figure.
※ Adjusting value
Adjustment of flow control
Speed characteristic 2-12 (140-7)

Tightening Flow control Flow change

amount of starting amount
adjusting pressure
screw (924) change

Delivery flow, Q
amount

(min -1) (Turn) (kgf/cm2) (ℓ/min)

2100 +1/4 +1.8 +12

Pilot pressure, Pi

2-12
(2) Total horsepower control

The regulator decreases the pump tilting

angle (delivery flow) automatically to limit
the input torque within a certain value with

Delivery flow, Q
a rise in the delivery pressure P1 of the
self pump and the delivery pressure P2 of
the companion pump.
(The input horsepower is constant when
the speed is constant.)
Since the regulator is of the simultaneous
Delivery pressure, (P1+P2)
total horsepower type that operates by the
sum of load pressures of the two pumps
in the tandem double-pump system, the
prime mover is automatically prevented
from being overloaded, irrespective of the
load condition of the two pumps, when
horsepower control is under way.
Since this regulator is of the simultaneous
total horsepower type, it controls the tilting
angles (displacement volumes) of the two
pumps to the same value as represented
by the following equation :
Tin = P1×q/2Л + P2×q/2Л
= (P1+P2)×q/2Л
The horsepower control function is the
same as the flow control function and is
summarized in the following. (For detailed
behaviors of respective parts, refer to the
section of flow control).

2-13
① Overload preventive function

621 651 652 623 612 601 625 626

P1 CL
B(E)
897

P2 P1
875

611

Large diameter Small diameter

Servo piston chamber
chamber
D

14W92RG03

When the self pump delivery pressure P1 or the companion pump delivery pressure P2 rises, it
acts on the stepped part of the compensating piston (621). It presses the compensating rod
(623) to the right till the force of the outer spring (625) and inner spring (626) balances with the
hydraulic force. The movement of the compensating rod is transmitted to lever 1 (612) via pin
(875).
Lever 1 rotates around the pin (875) (E) fixed to the casing (601).
Since the large hole section (F) of lever 1 contains a protruding pin (897) fixed to the feedback
lever (611), the feedback lever rotates around the fulcrum of point D as lever 1 rotates, and then
the spool (652) is shifted to the right. As the spool moves, the delivery pressure P1 is admitted
to the large diameter section of the servo piston via port CL, causes the servo piston move to the
right, reduces the pump delivery, flow rate, and prevents the prime mover from being overloaded.
The movement of the servo piston is transmitted to the feedback lever via point D. Then the
feedback lever rotates around the fulcrum of point F and the spool is shifted to the left. The
spool moves till the opening between the spool (652) and sleeve (651) is closed.

2-14
② Flow reset function

621 651 652 623 612 601 625 626

P1 CL
B(E)
897

P2 P1
875

611

Large diameter Small diameter

Servo piston chamber
chamber
D

14W92RG04

As the self pump delivery pressure P1 or the companion pump delivery pressure P2 decreases,
the compensating rod (623) is pushed back by the action of the springs (625 & 626) to rotate
lever 1 (612) around point E. Rotating of lever 1 causes the feedback lever (611) to rotate
around the fulcrum of point D and then the spool (652) to move to the left. As a result, port CL
opens a way to the tank port.
This causes the servo piston to move to the left and the pump's delivery rate to increase.
The movement of the servo piston is transmitted to the spool by the action of the feedback
mechanism to move it till the opening between the spool and sleeve is closed.

2-15
③ Low tilting angle (low flow) command preferential function
As mentioned above, flow control and horsepower control tilting angle commands are
transmitted to the feedback lever and spool via the large-hole sections (C & F) of levers 1 and 2.
However, since sections C and F have the pins (Ø4) protruding from the large hole (Ø8), only
the lever lessening the tilting angle contacts the pin (897) ; the hole (Ø8) in the lever of a larger
tilting angle command is freed without contacting the pin (897). Such a mechanical selection
method permits preference of the lower tilting angle command of the flow control and horsepower
control.
④ Adjustment of input horsepower
Since the regulator is of total cumulative horsepower type, adjust the adjusting screws of both
the front and rear pumps, when changing the horsepower set values. The pressure change
values by adjustment are based on two pumps pressurized at the same time, and the values will
be doubled when only one pump is loaded.

a. Adjustment of outer spring

Adjust it by loosening the hexagon nut
625 626 630 628
(630) and by tightening (or loosening)
the adjusting screw C (628).
Tightening the screw shifts the control
chart to the right and increases the
input horsepower as shown in the
figure. Since turning the adjusting
screw C (628) by N turns changes the
setting of the inner spring (626), return
the adjusting stem C (627) by N×A
turns at first. (A=1.85) 802 627

※ Adjusting value 2107A2MP07A

Speed Adjustment of input horsepower

Tightening Compensa- Input torque
Delivery flow, Q

amount of ting control change

adjusting starting amount
screw (C) pressure
(628) change
amount
(min -1) (Turn) (kgf/cm2) (kgf·m)

2100 +1/4 +20.0 +3.47

Delivery pressure, (P1+P2)

2-16
b. Adjustment of inner spring
625 626 630 628
Adjust it by loosening the hexagon nut
(802) and by tightening (or loosening)
the adjusting stem C (627).
Tightening the screw increases the flow
and then the input horsepower as
shown in the figure.
※ Adjusting value

Speed Adjustment of input horsepower

802 627
Tightening Flow change Input torque
amount of amount change 2107A2MP08
adjusting amount
stem (C)
(627)

(min -1)

Delivery flow, Q
(Turn) (ℓ/min) (kgf·m)

2100 +1/4 +9.5 +4.3

Delivery pressure, (P1+P2)

2-17
(3) Power shift control

621 651 652 623 612 601 625 626

898
P1 CL
B(E)
897

P2 P1
875

611

Large diameter Small diameter

Servo piston chamber
chamber
D

14W92RG05

The set horsepower valve is shifted by

varying the command current level of
the proportional pressure reducing
Delivery flow, Q

valve attached to the pump.

Only one propor tional pressure Pf=
reducing valve is provided. MIN
Pf= .
However, the secondary pressure Pf MA
X.
(power shift pressure) is admitted to the
horsepower control section of each
pump regulator through the pump's Delivery pressure, (P1+P2)
internal path to shift it to the same set
horsepower level.
This function permits arbitrary setting of the pump output power, thereby providing the optimum
power level according to the operating condition.
The power shift pressure Pf controls the set horsepower of the pump to a desired level, as
shown in the figure.
As the power shift pressure Pf rises, the compensating rod (623) moves to the right via the pin
(898) and compensating piston (621).
This decreases the pump tilting angle and then the set horsepower in the same way as
explained in the overload preventive function of the horsepower control. On the contrary, the
set horsepower rises as the power shift pressure Pf falls.

2-18
(4) Adjustment of maximum and minimum flows
① Adjustment of maximum flow
Adjust it by loosening the hexagon nut 954 808
(808) and by tightening (or loosening)
the set screw (954).
The maximum flow only is adjusted
without changing other control
characteristics.
14W92MP23
Speed Adjustment of max flow
Tightening Flow change
amount of amount

Delivery flow, Q
adjusting screw
(954)

(min -1) (Turn) (ℓ/min)

2100 +1/4 -3.4

Delivery pressure, Pn

② Adjustment of minimum flow

953 808
Adjust it by loosening the hexagon nut
(808) and by tightening (or loosening)
the hexagonal socket head set screw
(953). Similarly to the adjustment of the
maximum flow, other characteristics are
not changed.
14W92MP24
However, remember that, if tightened too
much, the required horsepower during
the maximum delivery pressure (or
during relieving) may increase.
Delivery flow, Q

Speed Adjustment of min flow

Tightening Flow change
amount of amount
adjusting screw
(953)

(min -1) (Turn) (ℓ/min)

Delivery pressure, Pn
2100 +1/4 +3.4

2-19
GROUP 2 MAIN CONTROL VALVE

1. STRUCTURE Mark Port name Port size Tightening torque

Rs Make up for swing motor UNF 1 3/16 18 kgf·m (130 lbf·ft)
Pa1 Option C pilot port
Pb1 Option C pilot port
Pc1 Travel pilot port (FW)
Dr6
Pd1 Travel pilot port (BW)
MRV
Pu Pa20 Boom up pilot port
Pa21 Boom up confluence pilot port
A1 B1 Pb20 Boom down pilot port
Pb21 Dr1
P02 P3 T1 Pb21 Boom holding valve pilot port
A2 B2 ORV
B2
P2 Pc2 Swing pilot port (RH)
Pd2 Swing pilot port (LH)
ORV
A2 Dr2
Pb3 Arm in confluence pilot port
Pc3 Swing priority pilot port
B4
Pa4 Option A pilot port (breaker)
P1 Pb4 Arm in regeneration cut port
ORV ORV
Pc40 Arm in pilot port
A5 B5
A5 B5 Pc41 Arm holding valve pilot port
P04
Pc42 Arm in regen-cut signal selector port
Dr4 Dr5 Pd40 Arm out pilot port
NRV2 Rs NRV1
Pd41 Arm out confluence pilot port 3.5~3.9 kgf·m
Pa5 Bucket in pilot port PF 1/4 (25.3~28.2 lbf·ft)
VIEW A Pb5 Bucket out pilot port
Pc5 Option B pilot port
Pd5 Option B pilot port
Pc6 Dozer down pilot port
Pd6 Dozer up pilot port
Dr0
Ai P0 Pilot pressure port
P0
Pu Main relief pressure up
ORV
Patt Ai Auto idle signal port
DOZER Pb1 Pc1 TRAVEL(FW) C1 D1 ORV
TRAVEL(BW) Pd1 Pa1
C1 D1 Patt Auto idle signal-attachment
P02 Pilot signal port
BOOM 1 Pb20 Pc2 SWING C2
P03
D2 SWING Pd2 Pa20 P03 Boom priority pilot port
P04 Boom parallel orifice pilot port
ARM 2 Pb3 Pc3 BOOM 2 & ORV
C4 V3
ORV
D4
BOOM 2 & Pd41 P05 Breaker summation pilot port
SWING PRIORITY SWING PRIORITY
A Pc42 Pb4 Dr3 Pc41
Pa21 P3 Quick clamp port
ARM REGENERATION
& OPTION-A(BREAKER)
Pc40 ARM 1 C4 D4 ARM 1 Pa4 Puo Pilot pressure port
Pd40 Dr0 Drain port (travel straight)
BUCKET Pb5 Pc5 OPTION-B ORV
C5 D5 ORV
OPTION-B Pd5 Pa5
Dr1 Drain port (boom holding valve)
C5
P05
D5
Puo Dr2 Drain port (boom2 & swing priority)
Dr3 Drain port (arm holding valve)
OPTION-C
Pc6 ORV
C6 D6 ORV OPTION-C Pd6 Pn1 Negative control signal port (P1 port side) 7~8 kgf·m
C6 D6
PF 3/8
Pn2 Negative control signal port (P2 port side) (50.6~57.8 lbf·ft)
A1 Option C port
B1 Option C port
C1 Travel motor port (FW)
D1 Travel motor port (BW)
B2 Boom rod side port
C2 Swing motor port (RH)
D2 Swing motor port (LH)
B4 Option A port (breaker) 15~18 kgf·m
A5 Bucket head side port PF 3/4 (109~130 lbf·ft)
B5 Bucket rod side port
C5 Option B port
D5 Option B port
C6 Dozer down port
Pn1 Pn2 D6 Dozer up port
P1 Pump port (P1 side)
P2 Pump port (P2 side)
A2 Boom head side port 20~25 kgf·m
C4 Arm head side port PF 1
(115~180 lbf·ft)
D4 Arm rod side port
Dr4 Drain port (swing logic valve) 1.5~1.9 kgf·m
Dr5 Drain port (flow summation) PF 1/8
(10.8~13.7 lbf·ft)
Dr6 Drain port (bucket load check)
T1 Return port SAE3000, 1 1/2 8.5~11.5 kgf·m
14W92MC01 (M12×1.75) (61.5~83.1 lbf·ft)

2-20
30 61 50 53 56 69 3 77 65 34 60 62 31 49 48 69 56 53 50 61 30 50 53 56 69 11 43 79 72 28 29 63 80 44 26 62 69 31 25 31 62 31 62
1 Housing-P1 41 Plug-orifice
2 Housing-P2 42 Plug
A A 3 Spool-straight travel 43 Load check-poppet
4 Spool-travel 44 Load check-poppet
B B
5 Spool-option C 45 Signal-poppet
6 Spool-swing 46 Travel straight-sleeve
C C
7 Spool-boom 1 47 Travel straight-piston
D D 8 Spool-swing priority 48 Orifice signal
9 Spool-boom 2 49 Coin type filter
E E 10 Spool-arm 2 50 Pilot cap
31 62 43 79 72 28 28 72 79 43 42 16
11 Spool-arm 1 51 Pilot cap
A-A (STRAIGHT-TRAVEL & SUPPLY) F F 12 Spool-arm regeneration 52 Pilot cap
50 17 53 56 69 4 63 29 72 28 79 43 17 69 56 53 51 & breaker 53 Socket bolt
27 82 69 59 41 42 67 32 43 79 28 72 63 29 80 44 12 69 56 53 51 13 Spool-option B 54 Socket bolt
G G
E-E (ARM 1 & ARM REGENERATION /BREAKER) 14 Spool-bucket 55 Socket bolt
H
15 Spool-dozer 56 Washer
31 62 1 16 Main relief valve 57 Spring washer
I 55,57 17 Overload relief valve 58 O-ring
50 18 53 56 69 13 6732 43 79 28 72 23 32 67 19 69 56 53 51 61 30 18 Overload relief valve 59 O-ring
19 Overload relief valve 60 O-ring
A A 20 Negacon relief valve 61 O-ring
21 Swing logic valve 62 O-ring
B B 22 Bucket logic valve 63 O-ring
50 53 56 69 5 72 28 45 81 58 33 48 49 69 17 56 53 51
23 Option on-off valve 64 O-ring
B-B (TRAVEL & OPTION-C) C C
24 Holding valve kit A1 65 O-ring
15 18 32 67 72 28 79 43 29 63 32 67 18
D D
25 Holding valve kit A2 66 O-ring
50 53 56 69 67 56 53 51 26 Holding valve kit B 67 O-ring
E E 27 Regeneration block 68 O-ring
28 Plug 69 O-ring
F F 29 Plug 70 O-ring
30 Plug 71 O-ring
50 17 53 56 69 43 79 72 28 63 29 80 44 14 17 69 56 53 51 G G 31 Plug 72 O-ring
I 32 Plug 73 O-ring
H
33 Plug 74 Backup-ring
F-F (OPTION-B & BUCKET)
2 54 57 34 Plug-parallel 75 Backup-ring
35 Plug-relief cat 76 Backup-ring
20 20
36 Plug-relief cat 77 Backup-ring
50 53 56 69 6 21 69 56 53 51 63 29 40 63 75 59
G-G (DOZER & NEGATIVE CONTROL) 37 Plug-relief cat 78 Backup-ring
38 Plug-bucket 79 Load check spring
52 17 53 56 69 8 77 65 60 34 60 34 77 65 32 67 9 17 69
39 Plug-bucket parallel 80 Load check spring
40 Plug-option 81 Poppet signal spring

38 63 76 61 75 59 39 63 76 61

SECTION I-I SECTION H-H

50 17 53 56 69 35713162 7466 31 62 63 29 80 44 10 17 69 50 17 53 56 69 7 44 80 63 29 72 28 79 43 26 69 24
D-D (SWING PRIORITY & BOOM 2 & ARM 2) C-C (SWING & BOOM 1)
14W92MC02

2-21
2. HYDRAULIC CIRCUIT

Pi1 Pi2
(Main pump) (Main pump)

PS PS
Rs Pn2 Pn1

C6
D6
Pc6

DOZER

PS
Pd6
Puo B5
A5
C5
D5 Pb5
Pc5
OPTION-B Pa5
P2 (Double BUCKET
acting solenoid)
Pd5
DR5
Dr6
P05
C4 P04(Boom up pilot)
Pb3
D4
B4
Pc42 DR3
Pc41 OPTION-A & ARM
Pc40 Pb4
Pa4 REGENERATION CUT
Pd40
Pd41(Shuttle)
Pi1(Arm safety) Pc42

ARM 1 V3
Pb3
Pc3
DR2
BOOM 2 & Pa21 ARM 2
SWING P05
PRIORITY Pd41
C2 B2
D2 Pd40
Pc2 A2 Pi1(Boom safety)
SWING Pd2 Pb21
DR1
Pb20
DR4
Pa20
Pa21 BOOM 1
P02 P04
(Boom priority)P03 Patt
PS
B1
C1 A1 Swing motor(SH)
D1
Pc1 Pb1

TRAVEL Pd1 Pa1 OPTION-C

DR0

P0
PS T1
P02 Ai

P3 P2 P1 Pu

A1 A2

14W92MC05

2-22
3. FUNCTION
1) CONTROL IN NEUTRAL
(1) P1 SIDE
The hydraulic fluid from pump A2 flows into the main control valve through the inlet port "P1", into
the P1 bypass passage and P1parallel passage.
The hydraulic fluid from the pump A2 is directed to the tank through the bypass passage of
spools : option C, boom 1, arm 2, arm regeneration & option A and bucket, the negative relief
valve of P1, tank passage, and the tank port "T1"
P1 port Tank port T1

B B

P1 Bypass passage P1 Parallel passage

SECTION A-A

P1 Bypass passage

A A

OPTION-C

BOOM 1

ARM 2

ARM REGEN
& OPTION-A

BUCKET

Tank passage

P1 Negative relief valve P2 Negative relief valve

SECTION B-B
14W92MC11

2-23
(2) P2 SIDE
The hydraulic fluid from pump A1 flows into the main control valve through the inlet port "P2", into
the P2 bypass passage and P2 parallel passage.
The hydraulic fluid from the pump A1 is directed to the tank through the bypass passage of
spools : travel, swing, boom 2 & swing priority, arm 1, option "B" and dozer, the negative relief
valve of P2, tank passage and the tank port "T1".

P2 Bypass passage Tank port T1

B B

P2 port P2 Parallel passage

SECTION A-A

P2 Bypass passage

A A

TRAVEL

SWING

BOOM 2 &
SW PRIORITY

ARM 1

OPTION-B

DOZER

Tank passage
SECTION B-B
14W92MC12

2-24
2) TRAVEL OPERATION
(1) TRAVEL FORWARD OPERATION
During the travel forward operation, the pilot pressure from the solenoid valve is supplied to the
port Pc1 of the spring opposite side, and it shifts travel spool in the right direction against springs.
Hydraulic fluid from the pump A1 flows into the travel spool through the bypass passage.
Then the bypass passage is shut off by the movement of the travel spool, it is directed to the
travel motor through port C1. At the same time, the hydraulic fluid from the travel motor through
port D1 returns to the tank passage through the travel spool.

Travel spool P2 Bypass passage

C1 D1

Pc1
TRAVEL
From solenoid valve

Tankpassage
Tank passage

14W92MC18

2-25
(2) TRAVEL REVERSE OPERATION
During the travel reverse operation, the pilot pressure from the solenoid valve is supplied to the
port Pd1 of the spring side, and it shifts travel spool in the left direction. Hydraulic fluid from the
pump A1 flows into the travel spool through the bypass passage.
Then the bypass passage is shut off by the movement of the travel spool, it is directed to the
travel motor through port D1. At the same time, the hydraulic fluid from the travel motor through
port C1 returns to the tank passage through the travel spool.

Travel spool P2 Bypass passage

C1 D1

From solenoid valve

TRAVEL Pd1

Tank passage

14W92MC17

2-26
3) BOOM OPERATION
(1) BOOM UP OPERATION
During boom up operation, the pilot secondary pressure from RCV is supplied to the port Pa20 of
the spring side and shifts the boom 1 spool in the left direction. The bypass passage is shut off by
the movement of the boom 1 spool and the hydraulic oil fluid from pump A2 is entered P1 parallel
passage and then passes through the load check, bridge passage and boom holding valve then
flows into the port A2. Following this it flows into the head side of the boom cylinder. (In this case,
the boom holding valve is free flow condition)
At the same time, the pilot pressure from RCV is supplied to the port Pa21 of the spring side of
boom 2 and shifts the boom 2 spool. The bypass passage is shut off by the movement of the
boom 2 spool and the hydraulic oil fluid from pump A1 entered boom summation passage via the
P2 parallel passage, the land of the swing priority spool, notch of the boom 2 spool, arm 2 spool
and the check. The flows combine in passage and are directed to port A2 and head side of boom
cylinder.
At the same time, the flow from rod side of the boom cylinder return to the boom 1 spool through
the port B2. Thereafter it is directed to the hydraulic oil tank through the tank passage.

P1 Bypass passage
Tank passage
Swing spool
Boom 1 spool
Holding valve

From RCV

Pa20

B2 A2
Boom summation P1 Parallel passage
passage

P2 Parallel passage Arm summation passage

P2 Bypass passage
Swing priority
spool Boom 2 spool
From RCV

Pa21

Arm 2 spool

Boom
Boomsummation passage
summation passage Load check
14W92MC24

2-27
(2) BOOM DOWN OPERATION
During the boom lowing operation, the pilot pressure from RCV is supplied to the port Pb20 of the
spring opposite side and shifts the boom 1 spool in the right direction.
The bypass passage is shut off by the movement of the boom 1 spool and the hydraulic fluid from
the pump A2 enters the parallel passage and is directed to the port B2 through the load check.
Following this, it flows into the rod side of the boom cylinder.
At the same time, the return flow from the head side of the boom cylinder returns to the port A2
and boom holding valve. And it is directed to the hydraulic oil tank through opened tank passage
by movement of the boom 1 spool.
Meanwhile some of return flow is directed to P1 parallel passage through the internal passage of
the boom 1 spool. (boom regeneration)
In this case, the holding valve is open condition, for details of the boom holding valve, see page
following page.
During the boom lowering operation, the fluid from A1 pump is not summation.

P1 Bypass passage

Tank passage
Boom 1 spool

Boom holding valve

From RCV

Pb20

B2 A2
Load check P1 Parallel passage

14W92MC26

2-28
4) HOLDING VALVE OPERATION
(1) HOLDING OPERATION
At neutral condition, the pilot piston chamber is connected to drain port through the pilot port.
And the piston "B" is supported with spring "B".
Also, the pressured fluid from actuator entered to inside of the holding valve through the
periphery hole of check, crevice of the check and the plug and the periphery hole of plug.
Then, this pressured oil pushed the poppet to the poppet seat and the check to the seat of body.
So the hydraulic fluid from actuator is not escaped and the actuator is not moved.

SPRING "A" CHECK VALVE PILOT PISTON CHAMBER

POPPET PISTON "A" SPRING "B" PISTON "B"

PLUG

CHECK

PILOT PORT
ACTUATOR PORT POPPET SEAT DRAIN PORT FOR RELEASE
HOLDING VALVE

14W92MC15

2-29
(2) RELEASE HOLDING OPERATION
The pilot pressure is supplied to the pilot port for release holding valve and shifts the piston "B" in
the left direction against the spring "B", and shifts the poppet in the left direction through piston
"B" and piston "A" against spring "B" and shifts the spool in the left side.
At same time, the return fluid from actuator returns to the drain port through the periphery hole of
check, crevice of the check and the plug, the periphery hole of the plug, in side of holding valve,
crevice of the poppet and the poppet seat, the periphery hole of the poppet seat, crevice of
socket and spool and internal passage of spool.
When the poppet is opened, pressure of inside of holding valve is decreased and the return fluid
from actuator returns to the tank passage through the notch of spool.

SPRING "A" CHECK VALVE PILOT PISTON CHAMBER

POPPET PISTON "A" SPRING "B" PISTON "B"

PLUG

CHECK

PILOT PORT
ACTUATOR PORT POPPET SEAT DRAIN PORT FOR RELEASE
HOLDING VALVE

14W92MC16

2-30
5) BUCKET OPERATION
(1) BUCKET IN OPERATION
During the bucket in operation, the pilot secondary pressure from RCV is supplied to port Pa5 of
the spring side and shifts the bucket spool in the left direction.
The bypass passage is shut off by the movement of the bucket spool and the hydraulic fluid from
pump A2 entered P1 parallel passage and is directed to the port A5 through the check 1 of
bucket logic valve.
At the same time, the hydraulic fluid from P1 bypass passage is directed to the port A5 through
the check 2.
Following this it flows into the head side of the bucket cylinder.
The return flow from the rod side of the bucket cylinder returns to the bucket spool through the
port B5. Thereafter it is directed to the hydraulic oil tank through the tank passage.

Tank passage P1 Bypass passage

Bucket spool
From RCV

Pa5

B5 A5
P1 Parallel passage
Check 2
Check 1
Bucket logic valve

14W92MC34

2-31
(2) BUCKET OUT OPERATION
During the bucket out operation, the pilot secondary pressure from RCV is supplied to port Pb5
of the spring opposite side and shifts the bucket spool in the right direction.
The bypass passage is shut off by the movement of the bucket spool and the hydraulic fluid from
pump A2 entered P1 parallel passage and is directed to the port B5 through the check 1 of
bucket logic valve.
At the same time, the hydraulic fluid from P1 bypass passage is directed to the port B5 through
the check 2.
The return flow from the head side of the bucket cylinder returns to the hydraulic oil tank through
the port A5 and the tank passage.

P1 Bypass passage Tank passage

Bucket spool
From RCV

Pb5

B5 A5
P1 Parallel passage
Check 2
Check 1
Bucket logic valve

14W92MC35

2-32
(3) BUCKET IN OPERATION WITH BOOM OPERATION
When combined operation, mostly same as previous page but the fluid from P1 bypass passage
is empty.
So only the fluid from P1 parallel passage is supplied to the bucket cylinder. Also, parallel
passage is installed the orifice of bucket logic valve for supplying the fluid from pump A2 to the
boom operation prior to the bucket operation. In case of the bucket out operation with boom

Tank passage P1 Parallel passage

Bucket spool
From RCV

Pa5

B5 A5
Orifice

Bucket logic valve

Po4
Boom up pilot pressure

14W92MC29

2-33
6) SWING OPERATION
(1) SWING LEFT & RIGHT OPERATION
During the swing left operation, the pilot secondary pressure from the RCV is supplied to the port
Pd2 of the spring side and shift the swing spool in left direction. The bypass passage is shut off by
the movement of the swing spool and the hydraulic fluid from pump A1 flows into swing spool
through the P2 parallel passage. Then it is directed to swing motor through the port D2.
As the result, swing motor turns and flow from the swing motor returns to the hydraulic oil tank
through the port C2, swing spool and the tank passage.
In case of swing right operation, the operation is similar to swing left operation but the pilot
secondary pressure from the RCV is supplied to the port Pc2 of the spring opposite side.
Accordingly, the hydraulic fluid from pump A1 flows into swing motor through the port C2 and
returns to the hydraulic oil tank through the port D2 and the tank passage.

Swing logic valve Check

Tank passage Swing spool

C2 D2

From RCV

Pd2

P2
P2Parallel
Parallelpassage
passage P2
P2 Bypass
Bypasspassage
passage

14W92MC32

2-34
(2) SWING LEFT OPERATION WITH ARM OR BOOM OPERATION
When combined operation, mostly same as previous page but the fluid from P2 bypass passage
is empty.
So only the fluid from parallel passage is supplied to the swing motor. Also, parallel passage is
installed the orifice of swing logic valve for supplying the fluid from pump A1 to the boom or the
arm operation prior to the swing operation. In case of the swing right operation with arm or boom
operation, operation is similar.

Boom up pilot pressure

P03

Swing logic valve Orifice

Tank passage Swing spool

C2 D2

Boom 1 spool From RCV

Pd2

P2
P2Parallel
Parallelpassage
passage P2 Bypass
P2 Bypasspassage
passage
14W92MC20

2-35
7) ARM OPERATION
(1) ARM IN OPERATION
During arm in operation, the pilot secondary pressure from the RCV is supplied to the port Pc40
of spring opposite side and shifts arm 1 spool in the right direction.
The bypass passage is shut off by the movement of the arm 1 spool and the hydraulic oil from the
pump A1 flows into the arm cylinder head side through P2 parallel passage, the load check valve,
bridge passage and the port C4.
At same time, the pilot secondary pressure from the RCV is supplied to the port Pb3 of spring
opposite side and shifts arm 2 spool in the right direction. The bypass passage is shut off by the
movement of the arm 2 spool and the hydraulic fluid from the pump A2 flows into the arm
summation passage through P1 parallel passage, the check valve, the arm 2 spool and the boom
2 spool. Then it entered the arm cylinder head side with hydraulic fluid from arm 1 spool.

Load check Arm summation passage

P2 Parallel passage Arm 1 spool
C4 D4
Piston C
Selector spool

Pc40

Arm regeneration
cut pilot pressure

Pb4

Pc42

Arm in Tank passage

pilot pressure
Arm regeneration P2 Bypass passage
& breaker spool

Arm summation passage

Boom 2 spool

Arm 2 spool
Arm in pilot
pressure
Pb3

From RCV

P1Bypass
P1 Bypass passage
passage P1P1 Parallel
Parallel passage
passage 14W92MC21

2-36
ARM REGENERATION
The return flow from the arm cylinder rod side is pressurized by self weight of arm and so, returns to
port D4. The pressurized oil returning to port D4 enters the arm regeneration & breaker spool through
the arm holding valve and the arm 1 spool. It is supplied the arm cylinder head through internal
passage. This is called the arm regeneration function.
The amount of regeneration fluid is changed by movement of the arm regeneration spool. A few
fluids after P2 parallel passage is push piston "C" through the notch of arm regeneration spool and
selector spool. At this time, the selector spool is opened by pilot pressure from RCV.
Then, the arm regeneration spool shifts to right side and flow to tank pass increases and regeneration
flow decreases. Therefore, pressure of arm cylinder head increases, then, arm regeneration flow
decreases.
Furthermore, the arm regeneration cut (cluster type 1 only) pressure is supplied to the port Pb4 of
spring opposite side and arm regeneration spool is move into the right direction fully. The flow from
the arm cylinder rod is returned to the hydraulic oil tank and regeneration function is not activated.
(The return fluid is maximum condition)

Load check valve Arm summation passage

P2 Parallel passage Arm 1 spool
C4 D4
Piston C
Selector spool

Pc40

Arm regeneration
cut pilot pressure Arm holding valve

Pb4

Pc42

Tank passage
Arm in
pilot pressure
Arm
Armregeneration
regeneration P2 Bypass passage
&&breaker
breaker spool
spool

14W92MC22

2-37
(2) ARM OUT OPERATION
During arm out operation, the pilot secondary pressure from RCV is supplied to the port Pd40 of
spring side and shifts arm 1 spool in the left direction.
The bypass passage is shut off by the movement of the arm 1 spool and the hydraulic fluid from
pump A1 flows into arm 1 spool through the P2 parallel passage. Then it enters into the arm
cylinder rod side through the load check, bridge passage, arm holding valve and the port D4.
Also, the pilot secondary pressure from RCV is supplied to the port Pd41 of spring side and shifts
arm 2 spool in the left direction.
The bypass passage is shut off by the movement of the arm 2 spool and some of the hydraulic
fluid from pump A2 bypassed through bypass notch. The rest of hydraulic fluid from pump A2
flows into the arm summation passage through P1 parallel passage, the check valve, arm 2 spool
and boom 2 spool.
Then it enters into the arm cylinder rod side with the fluid from the arm 1 spool.
The return flow from the arm cylinder head side returns to the hydraulic tank through the port C4,
the arm 1 spool and tank passage.

Load check Arm summation passage

P2 Parallel passage Arm 1 spool
C4 D4

Arm out
pilot pressure
Pd40

From RCV

Arm holding valve

Tank passage P2 Bypass passage

Bypass notch
Arm summation passage
Boom 2 spool

Arm 2 spool From RCV

Pd41
Arm roll out
pilot pressure

P1Bypass
P1 Bypasspassage
passage Check
Check P1Parallel
P1 Parallel passage
passage 14W92MC23

2-38
8) SWING PRIORITY FUNCTION
During swing priority operation, the pilot secondary pressure is supplied to the port Pc3 of the
spring side of the swing priority spool and shift swing priority spool in the right direction.
The hydraulic fluid from P2 parallel passage flows into the parallel passage of arm 1 side through
swing priority spool and the path "A" and also flows into the boom 2 spool.
When the swing priority spool is neutral condition, the passage is same as normal condition. But
due to shifting of the swing priority spool, the fluid from pump A1 flows to swing side more then the
boom 2, arm 1, option B and dozer spools to make the swing operation most preferential.

Swing priority spool Path "A" P2 Parallel passage

Swing priority
pilot pressure
Pc3

From RCV Boom 2 spool

Arm22spool
Arm spool

14W92MC27

2-39
9) DOZER OPERATION
(1) Dozer
ozer down operation

P2 Parallel passage Dozer spool

C6 D6

From dozer RCV

DOZER Pc6

Tank passage

14W92MC30

(2) Dozer
ozer up operation

P2 Parallel passage Dozer spool

C6 D6

Pd6
DOZER
From dozer RCV

Tank passage

14W92MC31

During the dozer down operation, the pilot pressure from the dozer control valve is supplied into
the port Pc6 of the spring side and it shifts the dozer spool in the left direction.
The hydraulic fluid from the pump A1 enters the parallel passage and is direction to the head side
of the dozer cylinder through port D6.
The return flow from the rod side of the dozer cylinder returns to the dozer spool through C6 port.
Thereafter it is directed to the hydraulic tank through tank passage.
In case of the dozer up operation, operation is similar.

2-40
10) NEGATIVE RELIEF VALVE OPERATION
When no function is being actuated on P1 side, the hydraulic fluid from the pump A2, flows into the
tank passage through the P1 bypass passage and orifice. The restriction caused by this orifice
thereby pressurizes. This pressure is transferred as the negative control signal pressure Pn1 to the
pump A2 regulator.
It controls the pump regulator so as to minimize the discharge of the pump A2.
The bypass passage is shut off when the shifting of one or more spools and the flow through
bypass passage became zero. The pressure of negative control signal becomes zero and the
discharge of the pump A2 becomes maximum.
The negative control pressure reaches to the set level, the hydraulic fluid in the passage pushes
open negative control valve and escapes into the return passage.
For the pump A1 the same negative control principle.

Tank passage P1 Bypass passage P2 Bypass passage

Bucket spool

Negative
control spring
Tank passage

P1 negative Orifice P2 negative

relief valve Pn1port
Pn1 port Pn2port
Pn2 port relief valve
14W92MC28

2-41
11) OPERATION OF MAIN RELIEF VALVE
(1) The pressurized oil passes through the orifice (A) of the plunger is filled up in chamber A of the
inside space, and seats the plunger against the housing securely.

Socket Chamber A Piston A Poppet Hole A Spring Piston B

Housing Tank
passage
Plunger T Orifice A
14W92MC36

(2) When the pressure at (P) becomes equal to the set pressure of the spring the hydraulic oil
passes through the piston (A) pushes open the poppet and flows to tank passage (T) through the
plunger internal passage, periphery orifice A, chamber A, periphery orifice B and the hole (E).

Piston A Poppet Spring

Periphery orifice B

Tank
passage
T Hole E

14W92MC37

(3) Opening the poppet causes the pressure in chamber A to fall and the plunger to open. As the
result the pressurized oil at port P runs into tank passage (T).

Plunger Poppet

Tank
passage
T

14W92MC38

2-42
(4) The pressure at port P becomes lower than set pressure of the spring, the poppet is seated by
spring force. Then the pressure at port P becomes equal to set pressure of the spring and the
plunger is seated to the socket.

Socket Poppet Spring

Housing Tank
passage
Plunger T

14W92MC39

(5) When the power boost switch is ON, the pilot pressure enters through hole A.
It pushes the piston (B) in the left direction to increase the force of the spring and change the
relief set pressure to the high pressure.

Hole A Spring Piston B

Housing Tank
passage
T

14W92MC40

2-43
12) OPERATION OF OVERLOAD RELIEF VALVE
FUNCTION AS RELIEF VALVE
(1) The pressurized oil passes through the piston A and orifice A is filled up in chamber A of the
inside space and seat the plunger against the socket and the socket against the housing securely.

Piston A Socket Chamber A Poppet Spring

Housing
Tank
passage Plunger Orifice A
T

14W92MC41

(2) When the pressure at port P becomes equal to the set pressure of the spring, the pressurized oil
pushes open the poppet and flows to tank passage (T) through the plunger internal passage,
orifice A, chamber A, periphery orifice B and hole E.

Tank passage Poppet Hole E Spring

T

Housing
Peripheryorifi
Periphery orifice
ce B B

14W92MC42

2-44
(3) Opening of the poppet causes the pressure in chamber A to fall and the plunger to open. As the
result the pressurized oil at port P runs into tank passage (T).

Tank passage Chamber A Poppet

T

Housing
Tank
passage Plunger
T
14W92MC43

(4) The pressure at port P becomes lower than set pressure of the spring, the poppet is seated by
spring force. Then the pressure at port P becomes equal to set pressure of the spring and the
plunger is seated to the socket.

Socket Poppet Spring

Housing
Tank
passage Plunger
T

14W92MC44

2-45
MAKE-UP FUNCTION
(5) When negative pressure exists at port P, the oil is supplied through tank passage (T). When the
pressure at tank passage (T) becomes higher than that of at port P, the socket moves in the right
direction. Then, sufficient oil passes around the socket from tank passage (T) to port P and fills up
the space.

Tank passage Socket Poppet

T

Housing
Tank
passage
T
14W92MC45

2-46
GROUP 3 SWING DEVICE

1. STRUCTURE
Swing device consists swing motor, swing reduction gear.
Swing motor include mechanical parking valve, relief valve, make up valve and time delay valve.

R/G grease fill port(PT 1/4) Time delay valve Relief valve Oil level gauge &
R/G Oil drain port(PT 1/2) Oil supply port
SH
SH Au
PG
PG Mu

GA GB

Dr

R/G Air bleed port(PT 1/4) A B

Reduction gear Swing motor

SH
14W92SM01

PG

Port Port name Port size

Au A Main port ൻ13
B Main port ൻ13
Dr Drain port PF 3/8
Mu Make up port PF 3/4
Dr
SH Brake release port PF 1/4
PG Stand by port PF 1/4
GB GA
GA, GB Gage port PF 1/4
Au Air vent port PF 1/4

B Mu A
Hydraulic circuit

2-47
1) SWING MOTOR

38

DETAIL K

6 5 11 10 9 16 19 22 7 35 34 36 37 30 32,33

27
26

25
28
29
41
44
43
42

2 3 4 1 8 13 12 15 14 17 18 23 21 20 39,40 24 31 14W92SM02

1 Body 16 Brake piston 31 Anti-rotating valve

2 Oil seal 17 O-ring 32 Time delay valve
3 Roller bearing 18 O-ring 33 Wrench bolt
4 Snap ring 19 Brake spring 34 Plug
5 Drive shaft 20 Rear cover 35 O-ring
6 Bushing 21 Needle bearing 36 Plug
7 Pin 22 Pin 37 Plug
8 Shoe plate 23 Valve plate 38 Level gauge
9 Cylinder block 24 Wrench bolt 40 Rivet
10 Spring 25 Plug 41 Plug
11 Ball guide 26 Back up ring 42 O-ring
12 Set plate 27 O-ring 43 O-ring
13 Piston assembly 28 Spring 44 Back up ring
14 Friction plate 29 Check
15 Separate plate 30 Relief valve

2-48
2) REDUCTION GEAR

2 4 3 23 5 1 26 7 25 6 19 8 16 10 11 9 21 12 24

20

A
16

14
18
15
17
13

22

26
25
Oil drain

Grease port

26

VIEW A
14W92SM03

1 Casing 10 Pin No.2 assembly 19 Stop ring

2 Drive shaft 11 Sun gear No. 2 20 Side plate No. 1
3 Cover plate 12 Carrier No. 1 21 Ring gear
4 Spacer 13 Planet gear No. 1 22 Knock pin
5 Roller bearing 14 Pin No.1 23 Hexagonal bolt
6 Roller bearing 15 Thrust washer (B) 24 Socket head bolt
7 Oil seal 16 Sun gear No. 1 25 Plug
8 Carrier No. 2 17 Spring pin 26 Plug
9 Planet gear No. 2 18 Stop ring

2-49
2. PRINCIPLE OF DRIVING
1) GENERATING THE TURNING FORCE
The high hydraulic supplied from a hydraulic pump flows into a cylinder (9) through valve cover of
motor (20), and valve plate (23).
The high hydraulic is built as flowing on one side of Y-Y line connected by the upper and lower sides
of piston (13).
The high hydraulic can generate the force, F1=P×A (P : supplied pressure, A : water pressure
area), like following pictures, working on a piston.
This force, F1, is divided as N1 thrust partial pressure and W1 radial partial pressure, in case of the
plate of a tilt angle, α.
W1 generates torque, T=W1+R1, for Y-Y line connected by the upper and lower sides of the piston
as following pictures.
The sum of torque (ΣW1×R1), generated from each piston (4~5 pieces) on the side of a high
hydraulic, generates the turning force.
This torque transfers the turning force to a cylinder (9) through a piston; because a cylinder is
combined with a turning axis and spline, a turning axis rotates and a turning force is sent.

W1 PISTON
CYLINDER

W1
R1
N1
O A
f1 F1 P

HIGH Y LOW

14072NEWSM03

2-50
2) MAKE UP VALVE
In the system using this type of motor, there is no counter balance functioning valve and there
happens the case of revolution exceeding hydraulic supply of motor. To prevent the cavitation
caused by insufficient oil flow there is a make up valve to fill up the oil insufficiency.
A make up valve is provided immediately before the port leading to the hydraulic oil tank to secure
feed pressure required when the hydraulic motor makes a pumping action. The boost pressure
acts on the hydraulic motor's feed port via the make up valve.
Pressurized oil into the port B, the motor rotate counterclockwise.
If the plunger of MCV moves neutral position, the oil in the motor is drain via left relief valve, the
drain oil run into motor via right make up valve, which prevent the cavitation of motor.

Relief valve

Make up check valve Make up check valve

A B

21092SM04

2-51
3) RELIEF VALVE

11 1 Body
2 Seat
10
5 3 Plunger
4 Spring
6 5 Adjusting screw
7
6 Piston
7 Bushing
8
8 Spring seat
9
9 Shim
12
10 O-ring
1 11 Back up ring
3 12 O-ring
4

2
14007A2SM05

(1) Construction of relief valve

The valve casing contains two cartridge type relief valves that stop the regular and reverse
rotations of the hydraulic motor. The relief valves relieve high pressure at start or at stop of swing
motion and can control the relief pressure in two steps, high and low, in order to insure smooth
operation.

(2) Function of relief valve

Figure illustrates how the pressure acting
on the relief valve is related to its rising P P=pressure, T=time
process. Here is given the function, Ps
referring to the figure following page.
4
P2

3
P1

T
1
2-48(2)

2-52
① Ports (P,R) at tank pressure.

A2 m h n g

A1
P

14007A2SM06

② When hydraulic oil pressure (P×A1) reaches the preset force (FSP) of spring (4), the plunger (3)
moves to the right as shown.
P1×A1=Fsp+Pg×A2

Fsp+Pg×A2
P1=
A1

4 g

P=P1

14007A2SM07

2-53
③ The oil flow chamber g via orifice m and n. When the pressure of chamber g reaches the preset
force (FSP) of spring (4), the piston (6) moves left and stop the piston (6) hits the bottom of bushing
(7).

4 m n g

P=P2

7 6
14007A2SM08

④ When piston (6) hits the bottom of bushing (7), it stops moving to the left any further. As the result,
the pressure in chamber (g) equals (Ps).
Ps×A1=Fsp+Ps×A2

Fsp
Ps=
A1-A2

P=Ps

7 6 g
14007A2SM09

2-54
4) ANTI-INVERSION VALVE
In the event of swing motor operates switch part to drive and stop the swing part. By the action of
pump on motor, there is brake on both-side of port because of the block on both sides.
Swing part is stopped by pressure of brake (in order words, 4-5 times of inversion)
Under the operating condition, the side of anti-inversion blocks off both ports but bypassing
compressed oil which is blocked in processing of anti-inversion fixed time and amount to inverse
port, prevent increasing pressure of motor and decrease inversing action.

Anti inversion valve

14W92SM10

2-55
5) BRAKE SYSTEM
(1) Control valve swing brake system
This is the brake system to stop the swing motion of the excavator during operation.
In this system, the hydraulic circuit is throttled by the swing control valve, and the resistance
created by this throttling works as a brake force to slow down the swing motion.

Work Deceleration Stop

A B A B A B

MCV MCV MCV

MCV A, B opened MCV A, B throttled MCV A, B closed

2-48(1)

(2) Mechanical swing parking brake system

This is function as a parking brake only when all of the RCV lever (except travel pedal) are not
operated.

① Brake assembly
Circumferential rotation of separate plate
(15) is constrained by the groove located
at housing (1). When housing is pressed
19
down by brake spring (19) through friction
plate (14), separate plate (15) and brake 9
piston (16), friction force occurs there. 16
15
Cylinder block (9) is constrained by this
14
friction force and brake acts, while brake
releases when hydraulic force exceeds 1
Groove
spring force.

14W92SM15

1 Housing 15 Separate plate

9 Cylinder block 16 Brake piston
14 Friction plate 19 Spring

2-56
② Operating principle
a. When one of the RCV lever (1) is set to the operation position, the each spool is shifted to left or
right and the pilot oil flow is blocked. Then the pilot oil go to SH of the time delay valve (3).
This pressure moves spool (5) to the leftward against the force of the spring(8), so pilot pump
charged oil (P3) goes to the chamber G through port PG.
This pressure is applied to move the piston (16) to the upward against the force of the spring
(19). Thus, it releases the brake force.

19 5

16 G SH

PG

1 RCV lever
2 Main control valve
P3
3 Time delay valve
5 Spool 2
8 Spring
16 Brake piston
19 Brake spring

14W92SM16

2-57
b. When all of the RCV lever (1) are set the neutral position, the spool (5) returns to right.
Then, the piston (16) is moved lower by spring force and the return oil from the chamber G flows
back to tank port.
At this time, the brake works.

19 5

16 G SH

PG

1 RCV lever
2 Main control valve
3 Time delay valve P3
5 Spool
2
8 Spring
16 Brake piston
19 Brake spring

14W92SM17

2-58
GROUP 4 TRAVEL MOTOR

1. CONSTRUCTION
Travel motor consists motor unit, regulator and counter balance valve.

Motor unit U T Regulator M1

MB(MA)

Gext

MA MB
B,A

S
M1 Gext
Counter balance valve
T G X

B A

B A

S
G X
VIEW Y

Port Port name Port size

T U
T G A, B Main port SAE 6000psi 1"
G N.A M14×1.5-12
M1 Gauge port M14×1.5-12
M1 X Pilot pressure port M14×1.5-12
X T Drain port PF 1/2-16
MA MB U Flushing port PF 1/2-16
S Make up port M27×2.0-14
MA, MB Gauge port M18×1.5-12
Gext Brake release port M12×1.5-12.5
Gext

A(fw) S B(bw)

Hydraulic circuit
14W7A2TR01

2-59
1) MOTOR UNIT

1 22 8 23 24 13 26 5 29 12

9 11 10 20 21 27 25 28 30 31 17 18 32 33

200W34TM02

1 Drive shaft 17 Threaded pin 26 Piston

5 Housing 18 Seal lock nut 27 Center pin
8 Locking screw 20 Retaining ring 28 Pan head screw
9 Retaining ring 21 Back up plate 29 Steel sealing ring
10 Shaft seal ring 22 Taper roller bearing 30 Cylinder block
11 Back up plate 23 Shim 31 Pressure spring
12 O-ring 24 Taper roller bearing 32 Adjustment shim
13 Locking screw 25 Retaining plate 33 Control lens

2-60
2) REGULATOR

2
20 23 32
7 24

15
4
16 8
28
34 26 5
50

33
55
56
57
29 58
51
59
52
21 60
53 1
19 54
61
62
64 67 68 70 69 71
63

65 66

14W72TM03

1 Control housing 28 Double break off pin 59 Retaining ring

2 Cover 29 Plug 60 Control piston
4 Positioning piston 32 Double break off pin 61 Control bushing
5 Positioning trunnion 33 O-ring 62 Retaining disc
7 Piston 34 Locking screw 63 Locking screw
8 Threaded pin 50 Relief valve 64 Double break off pin
15 Socket head screw 51 Adjusting bushing 65 Double break off pin
16 Socket head screw 52 Cylinder pin 66 Socket head screw
19 O-ring 53 Threaded pin 67 Cover
20 O-ring 54 Seal lock nut 68 Throttle screw
21 O-ring 55 Pressure spring 69 Socket head screw
23 Socket head screw 56 Spring collar 70 O-ring
24 Square ring 57 Pressure spring 71 Locking screw
26 Cylinder pin 58 O-ring

2-61
2. FUNCTION

Port plate

Counter balance valve

Motor unit

14W72TM05

1) VARIABLE DISPLACEMENT MOTOR(With integrated counterbalance valve)

The variable displacement motor has a rotary group in bent axis design.
The torque is generated directly at the drive shaft.
The cylinder barrel is driven by a tapered piston arrangement.
The change of displacement is generated by the control lens via positioning piston. The control
lens slides on a circular shaped surface.
In case of constant pump flow volume and high pressure
- The output speed is increased at smaller swivel angle, the torque is reduced
- The torque rises at swivel angle increase, the output speed is decreased
The max swivel angle is 25。, the min swivel angle is 0。.
The variable displacement motor with integrated counterbalance valve is designed to be operated
in open loop.
Min and max displacement are limited by a stop screw. Stepless adjustment to various higher
values is possible.
※ Reduction to smaller displacement may result in overspeeding the motor.
2) PORT PLATE
With high pressure dependent control HA1, mounted counterbalance valve, integrated secondary
pressure relief valves, plugged gauge and boosting ports, service ports to the rear.

2-62
 Port plate

Counter balance valve

Motor unit
14W72TM05

3) HIGH PRESSURE DEPENDENT CONTROL

The displacement is-dependent on operating pressure - automatically adjusted. Upon reaching
the operating pressure set at the control valve - internally measured at A or B - the motor swivels
from Vgmin to Vgmax until output torque = load torque. For values lower than the adjusted one the
motor keeps min swivel angle. The necessary positioning energy is taken from the respective high
pressure side via shuttle valve.
Swivelling results in a change of the displacement.
Swivel time is controlled by an orifice installed in the cover of the large positioning piston side.
4) COUNTERBALANCE VALVE
Mounted at the rear of the port plate.
Incase of downhill traveling or deceleration of the machine a counterbalance valve avoids
overspeeding and cavitation of hydraulic motor.
5) FUNCTION AS TO CIRCUIT DIAGRAM
Check valves in the inlet line A and B for by passing of the counterbalance valve.
At traveling forward the return oil flow is controlled by a counterbalance spool. At drop in inlet
pressure the counterbalance spool throttles the return oil flow. The motor is locked. The oil
behind the spool is led to the low pressure side via an additional check valve. Same function for
traveling forward and backward.
Braking means for the motor that
- At reduced or zero inlet flow the counterbalance spool reaches a modulating position or a neutral
position caused by spring force
- The high pressure oil(At outlet side of the motor) is returned to the low pressure side(At inlet side)
of the motor via crossover relief valves.
As the control pressure for regulation of the HA control via the integrated shuttle valve is no longer
available, the motor with HA control and counterbalance valve will swivel to its minimum
displacement during deceleration.
In addition, an external boost flow/pressure can be applied at port S for preventing cavitation.
※ Counterbalance valves do not replace the service and parking brake.

2-63
 Port plate

Counter balance valve

Motor unit
14W72TM05

6) INSTALLATION
The housing must be filled entirely with oil and shall also not run empty at rotary group standstill.
7) FILTRATION
According to purity class 9 as to NAS 1638, 6 as to SAE, ASTM, AIA and 18/15 as to ISO/DIS
4406.
8) PRESSURE
Ports A or B : Normal 400bar, peak pressure 450bar
Port A + B : Pressure summation below 700bar
Max permissible intermittent case pressure : 6bar
9) DIRECTION OF ROTATION/ DIRECTION OF FLOW
With view on the drive shaft - clockwise/ A to B; Counter-clockwise/ B to A
10) LEAKAGE OIL TEMPERATURE
In the bearing area max permitted -25。
C to +80。
C; Short time operation -40。
C to +115。
C
11) COMMISSIONING
Fill the housing entirely with oil through highest located T port. Also connect the leakage oil pipe at
this port. After commissioning check sealing and make visual control of the complete installation.

2-64
GROUP 5 RCV LEVER

1. STRUCTURE
The casing has the oil inlet port P (primary pressure) and the oil outlet port T (tank). In addition the
secondary pressure is taken out through ports 1, 2, 3 and 4 provided at the bottom face.

19 Switches
No. LH RH
5 One touch decel Horn
6 Power boost Breaker

B
5
19
25
Single
operation Simultaneous 6
operation

DETAIL B RH SIDE

Tilted direction of
handle(RH)

1 P
T Tilted direction of
connector(LH, RH)
2 3

Tilted direction of
handle(LH)

VIEW A

A
Port LH RH Port size

P T P Pilot oil inlet port Pilot oil inlet port

T Pilot oil return port Pilot oil return port
1 Left swing port Bucket out port
PF 3/8
2 Arm in port Boom down port
3 Right swing port Bucket in port
4 Arm out port Boom up port
1 3 2 4
Hydraulic circuit
1409S2RL01

2-65
CROSS SECTION
The construction of the pilot valve is shown in the attached cross section drawing. The casing has
vertical holes in which reducing valves are assembled.
The pressure reducing section is composed of the spool (4), spring (6) for setting secondary pres-
sure, return spring (10), stopper (8), spring seat (7, 13) and shim (5). The spring for setting the sec-
ondary pressure has been generally so preset that the secondary pressure is 5 to 20.5 kgf/cm2
(depending on the type). The spool is pushed against the push rod (9, 11) by the return spring.
When the push rod is pushed down by tilting the handle, the spring seat comes down simultaneously
and changes setting of the secondary pressure spring.

2-66
CROSS SECTION

22
24

25

23

21

20
8
18
19 15
16,26
17
13
10 14
7

27

6
12
9
11 5
4
3
1
2
Port 2,4 Port 1,3
1409S2RL02

1 Case 8 Push rod 15 Rod seal 22 Handle assembly

2 Bushing 9 Spring 16 Plate 23 Handle bar
3 Spool 10 Push rod 17 Boot 24 Nut
4 Shim 11 Spring 18 Joint assembly 25 Boot
5 Spring 12 Spring seat 19 Swash plate 26 Spring pin
6 Spring seat 13 Plug 20 Adjusting nut 27 Bushing
7 Stopper 14 O-ring 21 Lock nut

2-67
2. FUNCTIONS
1) FUNDAMENTAL FUNCTIONS
The pilot valve is a valve that controls the spool stroke, direction, etc of a main control valve. This
function is carried out by providing the spring at one end of the main control valve spool and apply-
ing the output pressure (secondary pressure) of the pilot valve to the other end.
For this function to be carried out satisfactorily, the pilot valve is composed of the following ele-
ments.
(1) Inlet port (P) where oil is supplied from hydraulic pump.
(2) Output ports (1, 2, 3 & 4) to apply pressure supplied from inlet port to ends of control valve spools.
(3) Tank port (T) necessary to control the above output pressure.
(4) Spool to connect output port to inlet port or tank port.
(5) Mechanical means to control output pressure, including springs that work on the above spools.
2) FUNCTIONS OF MAJOR SECTIONS
The functions of the spool (3) are to receive the supply oil pressure from the hydraulic pump at its
port P, and to change over oil paths to determine whether the pressure oil of port P is led to output
ports 1, 2, 3 & 4 or the output port pressure oil to tank port T.
The spring (5) works on this spool to determine the output pressure.
The change the deflection of this spring, the push rod (8,10) is inserted and can slide in the plug
(13).
For the purpose of changing the displacement of the push rod through the swash plate (19) and
adjusting nut (20) are provided the handle (22) that can be tilted in any direction around the fulcrum
of the universal joint (18) center.
The spring (9) works on the case (1) and spring seat (6, 12) and tries to return the push rod (8,10)
to the zero-displacement position irrespective of the output pressure, securing its resetting to the
center position.
This also has the effect of a reaction spring to give appropriate control feeling to the operator.

2-68
3) OPERATION
The operation of the pilot valve will be described on the basis of the hydraulic circuit diagram
shown below and the attached operation explanation drawing.
The diagram shown below is the typical application example of the pilot valve.

5 6

3
1
3
P T

2 4

2-70

1 Pilot valve 3 Main pump 5 Hydraulic motor

2 Pilot pump 4 Main control valve 6 Hydraulic cylinder

2-69
(1) Case where handle is in neutral position

T 5

P
3

Port 1 Port 3

1409S2RL03

The force of the spring (5) that determines the output pressure of the pilot valve is not applied to
the spool (3). Therefore, the spool is pushed up by the spring (9) to the position of port (1, 3) in
the operation explanation drawing. Then, since the output port is connected to tank port T only,
the output port pressure becomes equal to tank pressure.

2-70
(2) Case where handle is tilted

10

Port 1 Port 3

1409S2RL04

When the push rod (10) is stroked, the spool (3) moves downwards.
Then port P is connected with port (1) and the oil supplied from the pilot pump flows through port
(1) to generate the pressure.
When the pressure at port (1) increases to the value corresponding to the spring force set by tilt-
ing the handle, the hydraulic pressure force balances with the spring force. If the pressure at port
(1) increases higher than the set pressure, port P is disconnected from port (1) and port T is con-
nected with port (1). If it decreases lower than the set pressure, port P is connected with port (1)
and port T is disconnected from port 1.
In this manner the secondary pressure is kept at the constant value.
Besides, in some type, when the handle is tilted more than a certain angle, the upper end of the
spool contacts with the inside bottom of the push rod and the output pressure is left to be con-
nected with port P.

2-71
GROUP 6 ACCELERATOR PEDAL

1. STRUCTURE
The casing has the oil inlet port P (primary pressure), and the oil return port T (tank). In addition the
secondary pressure is taken out through port A.

25

42

T
P

17032RP01

Port Port name Port size

P Pilot oil inlet port
T T Pilot oil return port PF 1/4
A
A Pilot oil output port
P

Hydraulic circuit

17032RP01(2)

2-72
 GROUP 7 BRAKE PEDAL (VALVE)

1. STRUCTURE
The casing (spacer) has the oil inlet port A (primary pressure), and the oil outlet port T (tank). In
addition the secondary pressure is taken out through ports 1,2, 3 and 4 provided at the bottom face.

18
17-2
19
20
17
17-1
17-4
23
17-3
21
26 25
28 22
27 29
24
15
5 16
8 2
9 T1 30
31 BL1 29
32 P1 3
12 BR1
7 1
11 T2 BL2
13 14
P2 6
BR2
10
4 14W92BV01

1 Lower body 13 Spring Guide 21 Lock pin 1

2 Upper body 14 Snap ring 22 Lock pin 2
3 Spool 15 DU bushing 23 Torsion spring 1
4 Plug 16 Pedal plate 24 Torsion spring 2
5 Holder 17 Pedal assy 25 Retainer ring
6 Lower spring 17-1 Pedal 26 E-ring
7 Upper spring 17-2 Lock plate 27 Hex bolt
8 Main spring 17-3 Hex bolt 28 Hex nut
9 Spring retainer 17-4 Plain washer 29 Socket head bolt
10 O-ring 18 Pedal cover 30 Spring washer
11 O-ring 19 Latch 31 Plat washer
12 Oil seal 20 Bellows 32 Retainer ring

Port Port name Port size

P1 Port
P2 Port
BR1 Brake cylinder port
BL1 BR2 Brake cylinder port
T1
BR1 PF 3/8
P1 BL1 Pluging
BL2 Pluging
T1 Drain port
T2 Drain port
BL2
T2
BR2 P2
14W72BV02

2-73
2. FUNCTION
1) PURPOSE
The purpose of the brake valve is to sensitively increase and decrease the braking pressure when
the brake pedal is actuated.
2) READY POSITION
When the braking system is ready for operation, its accumulator pressure acts directly on port P1/
P2 of the brake valve. A connection is established between ports BR1/BR2 and port T1/T2 so that
the wheel brakes ports BR1/BR2 are pressureless via the returns ports T1/T2.
3) PARTIAL BRAKING
When the brake valve is actuated, an amount of hydraulic pressure is output as a ratio of the foot
force applied.
The spring assembly (8) beneath pedal plate (16) is designed in such a way that the braking
pressure changes depending on the angle. In the lower braking pressure range, the machine can
be slowed sensitively.
When the braking process is commenced, the upper spool (3) is mechanically actuated via spring
assembly (8), and the lower spool (3) is actuated hydraulically by spool (3). As spools (3) move
downward, they will first close returns T1/T2 via the control edges, thus establishing a connection
between accumulator port P1/P2 and ports BR1/BR2 for the wheel brake cylinders. The foot force
applied now determines the output braking pressure. The control spools (3) are held in the control
position by the force applied (spring assembly) above the spools and the hydraulic pressure below
the spool (balance of forces).
After output of the braking pressure, spools (3) are in a partial braking position, causing ports P1/
P2 and T1/T2 to close and holding the pressure in ports BR1/BR2.
4) FULL BRAKING POSITION
When pedal (17) is fully actuated, an end position of the brakes is reached and a connection
established between accumulator ports P1/P2 and brake cylinder ports BR1/BR2. Returns T1/T2
are closed at this point.
When the braking process ended, a connection is once again established between brake cylinder
ports BR1/BR2 and return ports T1/T2, closing accumulator ports P1/P2.
The arrangement of spools in the valve ensures that even if one braking circuit fails the other
remains fully operational. This is achieved by means of the mechanical actuation of both spools
and requires slightly more pedal travel.
5) LIMITING THE BRAKING PRESSURE
Pedal restriction screw (29) on pedal plate (16) below pedal (17) is used to limit the braking
pressure.
6) FAILURE OF A CIRCUIT
In the event of the lower circuit failing, the upper circuit will remain operational. Spring assembly
(8) will mechanically actuate spool (3). In the event of the upper circuit failing, the lower circuit will
remain operational since the lower spool (3) is mechanically actuated by spring assembly (8) and
spool (3).

2-74
 GROUP 8 TRANSMISSION

1. STRUCTURE

Lubrication pressure(S) Breather(EN) Emergency actuation

parking brake(PN)

Pressure relief
valve(UN)

Gauge port(Low speed, M)

Gauge port(High speed, J)

High speed breather(EB, brake)

Low speed breather
(EK, clutch)

Oil drain hole Oil filler hole

Oil level check

Shift pressure port(Low speed, P2) VIEW X

Shift pressure port(High speed, P1)
K B

Speed transmitter(N)

VIEW Y

14W92TM01

2-75
2. TRANSMISSION DIAGRAM

P
Pressure valve
M
Gearshift valve

Shift modulation valve T

B K M2 M1

K B Rotary
Upper chassis/undercarriage

S
K B
M Gearshift piston

J Check valve
EB Change over
check valve
EK Nab
LB Leakage check
valve
Pressure limiting
valve

LK
Pump for lube oil &
control pressure shift interlock

= Pressure line transmission control

= Tank line transmission control
UN Output = Lubrication pressure
Output
= Suction line lube oil pump
PN = Transmission lubrication oil
S = Emergency actuation parking brake
EN
14W7A2TM02

Measuring points-Transmission/Shift interlock : Measuring points-Valve block :

J : High speed (brake) M : System pressure transmission control
M : Low speed (clutch)
S : Lubrication pressure Connections-Valve block :
P : System pressure transmission control
Connections-Transmission/Shift interlock : T : Tank
B : Brake B : Brake
K : Clutch K : Clutch
PN : Emergency actuation parking brake
Solenoid valves-valve block :
M1 : Solenoid valve (low speed)
M2 : Solenoid valve (high speed)

Port Name Size Port Name Size

P1 (B) Shift pressure, High speed M16×1.5 M Gauge port, Low speed M10×1.0
P2 (K) Shift pressure, Low speed M16×1.5 S Lubrication pressure port M10×1.0
J Gauge port, High speed M10×1.0 PN Parking brake lubricant Grease nipple

2-76
3. OPERATION OF TRANSMISSION
1) DESCRIPTION

1 2 3 4 5 6 11

INPUT

OUTPUT OUTPUT

10 9 8
14W7A2TM03

1 Cup spring 5 Planetary drive 9 Output flange-Front axle

2 Input shaft 6 Lub oil pump 10 Travel motor attachment
3 Disk brake 7 Spur gear drive 11 Shift interlock
4 Disk clutch 8 Output flange-Rear axle

Coaxially-mounted variable displacement travel motor (10) with specific displacement 107 cm3/rev.
The 2-speed powershift transmission comprises a planetary drive (5), a 2 shaft spur gear drive (7)
with output flanges to front and rear axle.
The powershift mechanism for the planet drive comprises a rotating multi-disk clutch (4) underneath
a multi-disk brake (3) rigidly connected to the housing. Both are closed by spring pressure (2) and
released hydraulically.
The shift interlock (11) prevents downshifts at high machine speeds and thus prevents over-rotation
of the travel motor. If the low speed gear is selected while the high speed gear is engaged and input
speed is above approx. 1000rpm, the low speed gear shift is inhibited and only performed if input
speed is below this limit. With higher viscosity oil (cold starting), the downshift is performed at a
lower input speed. Upshifts are always possible.The speed-dependent interlock is effective in both
directions. It does not prevent the possibility of over-rotation when the machine is coasting. For this,
a drive brake valve should be fitted to the travel motor.

2-77
2) LOW SPEED (forward & reverse)

Ring gear Planetary carrier

Low speed
pilot pressure
applied

P1(B)
INPUT
P2(K)

Spur gear 1
Spring
Spur gear 2

Piston Clutch
Brake
OUTPUT OUTPUT

14W7A2TM04

In low speed operation, the internal gear of the planetary drive is backing upon the closed, case-
rigid brake. In this speed the piston chamber of the brake is unpressurized, so that the elastic force
and additionally the hydraulic pressure of the clutch piston is acting upon the disk pack.
At this time the clutch is open, i.e. the hydraulic released.

2-78
3) HIGH SPEED (forward & reverse)

Ring gear Planetary carrier

High speed pilot

pressure applied

P1(B)
INPUT
P2(K)

Spur gear 1
Spring
Spur gear 2

Piston Clutch
Brake
OUTPUT OUTPUT

14W7A2TM05

In high speed operation, the clutch is held closed under spring pressure and the brake is
hydraulically opened.
When a gear shift occurs-for example from high speed to low speed gear- the oil from the brake
piston space is fed back to the tank through a restrictor (change over check valve) due to the spring
pressure acting on the brake piston. At the same time the clutch is filled with oil and opened.
Required oil flow is necessary for the transmission control to ensure the clutch is open before the
brake begins to transmit torque.
A shift modulation valve is also integrated in the transmission. This modulates the pressure
sequence at the brake during a upshift in order to achieve good shift quality.
The gear shift equipment also has the function of a parking brake. When the brake is operated-for
example with high speed gear engaged-the clutch is closed and is statically loaded.

2-79
4) BRAKES

Travel high & low speed

pilot pressure not applied

P1(B)

P2(K)

OUTPUT OUTPUT

14W7A2TM06

When the travel high/low speed pilot pressure is not applied in the piston space, the piston
compress against the multi disk pack due to the spring force. Thus the parking brake is engaged.

2-80
4. TECHNICAL DATA
1) GENERAL DATA
(1) Max input power : 110 kW
(2) Max input torque : 78.5 kgf·m
(3) Max output speed : 3500 rpm
(4) Hydraulic motor : 140 cm3/rev
(5) Transmission ratio
Gear step : 4.06
·Low speed gear : 4.87
·High speed gear : 1.20
(6) Shift interlock
Downshift possible at operating temperature with input speed 1000rpm (downshift point lower when
oil temperature cold).
(7) Disconnection device
For towing away machine auxiliary release device for parking brake.
(8) Brake
Parking brake. Necessary brake deceleration by controlled locking of planetary drive. Braking
torque depends on opening pressure set at brake valve (13 bar).
(9) Output flange
Bolts for propshaft connection : M10×1.0 (class 10.9)
(10) Transmission weight : 135kg
2) TRANSMISSION CONTROL
Following data are valid for oil temperature 30˚C to 40˚C in hydraulic tank, measured at connections
at powershift transmission (see structure and diagram).
(1) Control pressure
① At connection P1 and P2 at Low/High engine speed : 33+1 kgf/cm2
② Definition of lubricants : API GL-5, SAE 10W-30, 15W-40
(2) Oil flow
① Min oil flow at 24+1 kgf/cm2 counter pressure (low engine speed) : 5.5ℓ/min
② Max oil flow : 25ℓ/min
(3) Residual pressure
① Max residual pressure in control line to tank connection P1 and P2 : 1.0 kgf/cm2
(4) Leakage oil transmission control
① Pressure in input housing connection (E) max : 1.0 kgf/cm2
② Max oil flow (low speed actuated) : 1ℓ/min

2-81
GROUP 9 TR
TRAVEL
AVEL CONTROL VALVE

1. STRUCTURE

CT2

CT1

T
TRAVEL
PILOT TP
AC1

M1 CT3

CH

M2

14W7A2TCV02

AC1 M2

Ø1.2 Port name Port size

M1 P, T, AC1 PF 1/2
CT3 TP PF 3/8
CT2
M1, M2, CH PF 1/4
P
TP
(TRAVEL
PILOT) T

CT1

CH (CHOCK)

Hydraulic circuit

2-82
2. COMPONENT

4 7

7
AC1

M1 6
CT3
T

1
1
CT
2
CT

7 7

2, 5

14W7A2TCV01

1 Body 5 Coil
2 Solenoid valve 6 Orifice
3 POD valve 7 Plug
4 Check valve

2-83
GROUP 10 STEERING VALVE

1. STRUCTURE

L R

T AP A

SECTION A-A

L R

Port Port name Port size

L Left port
R Right port
3/4-16UNF
T Tank port
P Pump port

P T
Hydraulic circuit
14W92SV01

2-84
2. COMPONENTS

26

2
26

1 2
24
27
29
2 5
7

9 3 8
4
32
2

12
2

11

13
14

15
18
16 21
15
16
17
18
20
22
14W7A2STV01

1 Dust seal 11 Shaft 20 Pin screw

2 Housing, spool, sleeve 12 Spring set 21 Screw
3 Ball 13 O-ring 22 Name plate
4 Bushing 14 Distributor plate 24 Pressure relief valve
5 O-ring 15 Gear wheel set 26 Shock valve
7 Bearing assy 16 O-ring 27 Ball
8 Ring 17 End cover 29 Bushing
9 Cross pin 18 Washer 32 Check valve

2-85
 SECTION 3 HYDRAULIC SYSTEM

Group 1 Hydraulic Circuit -------------------------------------------------------------------------------------------------- 3-1

Group 2 Main Circuit --------------------------------------------------------------------------------------------------------- 3-3
Group 3 Pilot Circuit ---------------------------------------------------------------------------------------------------------- 3-6
Group 4 Single Operation ------------------------------------------------------------------------------------------------- 3-14
Group 5 Combined Operation ------------------------------------------------------------------------------------------ 3-29
 SECTION 3 HYDRAULIC SYSTEM
GROUP 1 HYDRAULIC CIRCUIT (cluster type 1)
4
T2 U
46 47 46 47 10 11 8 9
T1 G

40 41 43

Vg max
Vg min
M1
42
39 X
1 Main pump
MB 48 49 48 49 2 Main control valve
M T
3 Swing motor
P2 P1
P 4 Travel motor
5 RCV lever (LH)
G ext.
45 6 RCV lever (RH)
A(fw) S B(bw)
T
Pi1 Pi2
7 RCV pedal
P (Pump) (Pump) 8 Boom cylinder (LH)
Pn2 Pn1
9 Boom cylinder (RH)
Rs 2 10 Arm cylinder
C6 11 Bucket cylinder
A1 A2
50 Pc6 D6 12 Turning joint
12 13 Check valve
51 14 Check valve
PS
Pd6 B5 15 Hydraulic tank
24 Puo
16 Oil cooler
C5 A5
17 Air breather
D5 Pb5
3 Pc5
Pa5 18 Bypass valve & return element
19 Strainer assy
35 SH
63 Pd5
20 Drain filter
AC1 31 36 DR5
Po5 P04
30 24 M2 ACC1GP ACC1 ACC2 34
PG
C4
21 4 solenoid valve & pilot line filter
32 Dr
PS

B4
M
33 BR1
BR2 DR3
D4 22 Pressure sensor (500K)
Pc41
M1
35 K
Pb4 23 Pressure sensor (100K)
P Pa4
P B ACGP
Pd40 24 Pressure sensor (50K)
PS

TP T 38 GA GB
Pc40 25 Terminal
Mu V3
PS Pc42 26 Last guard filter
T
T3 37 Pc3
Pb3 27 Last guard filter
P1 DR2
Pa21
62 28 RCV dozer (option)
CW CCW Pd41
54 29 Power train pump
A B C2
dr2 dr3
PS B2 30 Steering valve
Pc2 D2
P PGP P T4 (TGP)
23 Pd2 A2 31 Travel control valve
T2 Pb21 DR1
DR4
Pb20 32 TCV valve
Breaker Only,
instead of 24,59,61
P02
Pa20 33 Brake supply valve
64 Pd5 PS 24 26 P T DOZER P03 Patt
PS
34 Brake valve
A1 61 A1 A2 P2 A3 28 C1 B1
24 35 Accumulator (option)
A1
67 Pc1
D1 Pb1 36 Accumulator (option)
24 Pd1 37 Pressure switch (5K)
PS
A2
Pc6 Pd6 P0 DR0
Pa1 38 Pressure sensor (200K)
T T B T
39 Transmission
P P1
A P
24 PS Ai T1 40 Front axle
P3 P2 P1
41 Rear axle
Pu
42 Locking valve
SWING P T ARM BUCKET P T BOOM 26 43 Oscillating cylinder
5 6 P T
TRAVEL 26P
7 T 2WAY 44 2 solenoid valve (option)
59 45 2 solenoid valve (option)
1 46 Outrigger cylinder (LH, option)
(1,A) (3,B) (2,D) (4,E) (3,F) (1,G) (2,H) (4,J) 1
A1 A2
60 56 47 Outrigger cylinder (RH, option)
PS PS
A1 PS1 Pd5 Pc5 48 Pilot check valve (LH, option)
44 22 22 55 57 49 Pilot check valve (RH, option)
57
T
Pi1 B 50 Pressure switch (option)
(Pn2
MCV) 51 Tee shuttle
27 C
53 EPPR valve (option)
a b d e f g h j B1 B2 54 Pi2
(Pn1 54 Tee shuttle
25 Pc1 (FW) Pd1 (BW) 27 MCV)
PS 55 Accumulator (option)
c
24 56 Accumulator (option)
Pd2 Pc2 Pb5 PS
Pd40 Pc40 Pa5 Pb20
DR#,dr#
13 P1 57 Stop valve (LH/RH, option)
Pc3 Pa20 24 53 1 14 E/G 59 2 way pedal (option)
(MCV) PS 24 2
60 3 way joint (option)
P03 Pb4 Pu
17 16
(MCV) (MCV) (MCV) 3
T2,T3,T4
B1 61 Solenoid valve (option)
P1 62 Selector valve (option)
21 A5 A4 A2 A1 P2
63 Shuttle valve (option)
15 18
P4 PG (S/Motor) 64 Breaker solenoid valve (option)
P3 P0 (MCV) 19 67 Quick clamp solenoid valve (option)
P2 20 29
S2 S1 B3 A3
P1
T(dr1)

140W9S3HC01

3-1
■ HYDRAULIC CIRCUIT (cluster type 2)
4
T2 U
46 47 46 47 10 11 8 9
T1 G

40 41 43

Vg max
Vg min
M1
42
39 X

MB 48 49 48 49
M T

P2 P1
P 1 Main pump
2 Main control valve
G ext.
45 3 Swing motor
A(fw) S B(bw)
T
Pi1 Pi2
4 Travel motor
P (Pump) (Pump) 5 RCV lever(LH)
Pn2 Pn1
6 RCV lever(RH)
Rs 2 7 RCV pedal
C6 8 Boom cylinder(LH)
A1 A2
50 Pc6 D6 9 Boom cylinder(RH)
12 10 Arm cylinder
51 11 Bucket cylinder
PS
Pd6 B5 12 Turning joint
24 Puo
13 Check valve
C5 A5
14 Check valve
D5 Pb5
3 Pc5
Pa5
15 Hydraulic tank
16 Oil cooler
35 SH
63 Pd5
17 Air breather
AC1 31 36 DR5
Po5 P04
30 52 M2 ACC1GP ACC1 ACC2 34
PG
C4
18 Bypass valve & return element
32 33 BR1
Dr
D4
B4
19 Strainer assy
M1 M BR2 DR3
Pc41
35 K
Pb4
20 Drain filter
P Pa4
P B ACGP
Pd40 21 3 solenoid valve & pilot line filter
TP GA GB
T Pc40 22 Screw coupling
38 Mu V3
Pc42 23 Pressure switch(49K)
T
T3
Pc3
Pb3 24 Pressure switch(17K)
P1 37 DR2
Pa21 25 Terminal
CW CCW Pd41 26 Last guard filter
A B C2
dr2 dr3 B2 27 Last guard filter
Pc2 D2
P
T2 PGP P T4 (TGP) 23 Pd2 A2 28 RCV dozer(option)
Pb21 DR1
DR4
Pb20 29 Power train pump
Breaker Only,
instead of 24,59,61
P02
Pa20 30 Steering valve
64 Pd5 26 P T DOZER P03 Patt 31 Travel control valve
A1 61 28 C1 B1
24 32 TCV valve
A1
67 Pc1 D1 Pb1 33 Brake supply valve
24 Pd1 34 Brake valve
PS
A2
Pc6 Pd6 P0 DR0
Pa1 35 Accumulator(option)
T B T
T
36 Accumulator(option)
P P1 A P
Ai
T1 37 Pressure switch(5K)
24
P3 P2 P1
38 Pressure switch(95K)
Pu
39 Transmission
SWING P T ARM BUCKET P T BOOM 26 40 Front axle
5 6 P T TRAVEL
7 26P 2WAY 41 Rear axle
T
59 42 Locking valve
1 43 Oscillating cylinder
(1,A) (3,B) (2,D) (4,E) (3,F) (1,G) (2,H) (4,J) 1
A1 A2
60 56 44 2 solenoid valve(option)
PS PS
A1 PS1
Pd5 Pc5 45 2 solenoid valve(option)
44 22 22 55 57 46 Outrigger cylinder(LH, option)
57
T
B 47 Outrigger cylinder(RH, option)
48 Pilot check valve(LH, option)
Pi1
27 C
49 Pilot check valve(RH, option)
(Pn2 Pi2
a b d e f g h j B1 B2 MCV) (Pn1 50 Pressure switch(option)
25 Pc1 (FW) Pd1 (BW) 27 MCV)
PS 51 Tee shuttle
c
22 52 Pressure switch(25K, option)
Pd2 Pc2 Pb5
Pd40 Pc40 Pa5 Pa20 Pb20
DR#,dr#
13 P1 55 Accumulator(option)
Pc3 14 E/G 56 Accumulator(option)
(MCV)
PS 24 57 Stop valve(LH, RH, option)
P03 Pu 17 16
(MCV) (MCV) B1 59 2 way pedal(option)
T2,T3,T4
15 P1 60 3 way joint(option)
21 A3 A2 A1 P2
61 Solenoid valve(option)
18
P4 PG (S/Motor) 64 Breaker solenoid valve(option)
P3 P0 (MCV) 19 67 Quick clamp solenoid valve(option)
P2 20 29
S2 S1 B3 A3
P1
T(dr1)

140W9S3HC01-1

3-2
GROUP 2 MAIN CIRCUIT

The main hydraulic circuit consists of suction circuit, delivery circuit, return circuit and drain circuit.
The hydraulic system consists of one main pump, one control valve, one swing motor, four cylinders
and two travel motors.
The swash plate type variable displacement axial piston pump is used as the main pump and it is
driven by the engine at ratio 1.0 of engine speed.

1. SUCTION AND DELIVERY CIRCUIT

To cylinders To motors

Main control valve To oil cooler

To hydraulic oil tank

Main pump Suction filter

Hydraulic oil tank

3-2 (290LC-7)

The pumps receive oil from the hydraulic tank through a suction filter. The discharged oil from the
pump flows into the control valve and goes out the tank ports.
The oil discharged from the main pump flows to the actuators through the control valve.
The control valve controls the hydraulic functions.
The return oil from the actuators flows to the hydraulic tank through the control valve and the oil
cooler.

3-3
2. RETURN CIRCUIT

Check valve(2)
Full flow filter Oil cooler 3.0kgf/cm 2

Main control valve Actuators

Check valve(1)
4.5kgf/cm 2

Check valve(3)
1.5kgf/cm 2

14W7A3CI01

All oil from each actuator returns to the hydraulic tank through the control valve.
The bypass check valves are provided in the return circuit.
The setting pressure of bypass check valves are 3.0 kgf/cm2 (43 psi) and 4.5 kgf/cm2 (64 psi). Usually, oil
returns to the hydraulic tank from the left side of control valve through oil cooler.
When oil temperature is low, viscosity becomes higher and flow resistance increases when passing
through the oil cooler. When the oil pressure exceeds 4.5 kgf/cm2 (64 psi), the oil returns directly to the
hydraulic tank, resulting in the oil temperature being raised quickly at an appropriate level.
When the oil cooler is clogged, the oil returns directly to the hydraulic tank through bypass check valve
(1).
The return filter and bypass relief valve are provided in the hydraulic tank.
The oil returned from right and left side of control valve is combined and filtered by the return filter. A
bypass relief valve is provided in the full-flow filter.
When the filter element is clogged, the bypass relief valve opens at 1.5 kgf/cm2 (21 psi) differential
pressure.

3-4
3. DRAIN CIRCUIT

Travel motor Swing motor

Return line
Turning
joint Main
pump

dr #, DR #
Return filter

Hydraulic
Drain
Spin fifilter
lter oil tank

Check valve
1.5kgf/cm 2

14W93CI02

Besides internal leaks from the motor, transmission, front and rear axle the oil for lubrication circulates.
The main pump drain oil have to be fed to the hydraulic tank passing through drain filter. When the
drain oil pressure exceed 1.5 kgf/cm2 (21psi), the oil returns to the hydraulic tank directly.

1) TRAVEL MOTOR DRAIN CIRCUIT

Oil leaking from the travel motor comes out of the drain ports provided in the respective motor
casing and joins with each other. This oil passes through turning joint and returns to the hydraulic
tank after being filtered by drain filter.
2) SWING MOTOR DRAIN CIRCUIT
Oil leaking from the swing motor comes out and return to the hydraulic tank passing through a drain
filter.
3) MAIN PUMP DRAIN CIRCUIT
Oil leaking from main pump come out and return to the hydraulic tank passing through drain filter.

3-5
GROUP 3 PILOT CIRCUIT

Remote control valve Dozer & outrigger Remote control valve

(LH lever) lever (RH lever)

Breaker solenoid valve

Safety lock
solenoid valve Swing parking brake
Control valve

Power boost solenoid valve

Arm regeneration cut solenoid

valve

Main pump Swing reduce EPPR valve

Line filter
Relief valve
40kgf/cm 2

Pilot pump Suction filter

140W9S3CI03

The pilot circuit consists of suction circuit, delivery circuit and return circuit.
The pilot pump is provided with relief valve, receives the oil from the hydraulic tank through the
suction filter.
The discharged oil from the pilot pump flows to the remote control valve, EPPR valve, solenoid valve
assemblies, swing parking brake, main control valve and safety lock solenoid valve through line filter.

3-6
 1. SUCTION, DELIVERY AND RETURN CIRCUIT
DOZER/ OUTRIGGER CYLINDER ARM BUCKET
CYLINDER CYLINDER BOOM CYLINDER
OSCILLATING
FRONT AXLE REAR AXLE CYLINDER

TRAVEL MOTOR

TRANSMISSION

T
P2 P1
P Pi1(Pump) Pi2(Pump)
Rs Pn2 Pn1

C6
D6 Pc6

TURNING DOZER
JOINT PS
Pd6 B5
Puo
C5 A5
D5 Pb5
Pc5
Pa5
SWING MOTOR OPT-B BUCKET
Pd5
DR5
C4 P05 P04

D4 DR3 B4
Pc41
Pb4
Pa4
Pd40
Pc40 ARM 1 Pc42
V3 ARM
REGEN Pb3
Pc3
DR2
Pa21
BOOM 2 ARM 2 Pd41
C2 B2
P D2
T2 Pc2
Pd2 Pb21 A2
ACC1 BRAKE VALVE DR1
AC1 ACC1GP ACC2 SWING Pb20
DR4
M2 BR1 Pa20
PS

BR2 P02
M BOOM 1
M1 P03 Patt
PS
P K C1 B1
P A1
TP
B D1 Pc1 Pb1
T
Pd1 Pa1
TRAVEL OPT-C
T P0 DR0
T3 SH
P1
(S/Motor)
PS T1
dr2 Ai
PGP P dr3 P3
T4(TGP)
P2 P1 Pu

ACCELERATOR
PEDAL RCV LEVER(LH) RCV LEVER(RH)

P T SWING P T ARM BUCKET P T BOOM

DOZER LEVER A1 A2 MAIN PUMP
P T PS PS

1 2 Pi1
(1) (3) (2) (4) (3) (1) (2) (4) (Pn2
Pc1(FW) Pd1(BW) MCV)
Pi2
a b d e f g h j Pc6 Pd6 (Pn1
MCV)
c
Pd2 Pc2 Pd40 Pb5 PS
Pc40 Pa5 PS Pb20 DR#, dr#
Pc3
Pa20
PS P1
SAFETY ENG
PO3 Pb4 Pu SOLENOID
(MCV) (MCV) (MCV) VALVE
B1
T2,T3,T4 P1
HYD P2
P4 PG(S/M) TANK
P3 PO(MCV)

P2
T(dr1) S2 S1 B3 A3
P1 PILOT
RELIEF VALVE
LINE FILTER

140W9S3HC02

The pilot pump receives oil from the hydraulic tank. The discharged oil from the pilot pump flows to
the safety solenoid valve through the line filter. The oil is filtered by the line filter. The pilot relief valve
is provided in the pilot pump for limiting the pilot circuit pressure.
The oil filtered by line filter flows remote control valve through safety solenoid valve.
The return oil from remote control valve is returned to the hydraulic tank.

3-7
 2. SAFETY SOLENOID VALVE (SAFETY LEVER)

DOZER/ OUTRIGGER CYLINDER ARM BUCKET

CYLINDER CYLINDER BOOM CYLINDER
OSCILLATING
FRONT AXLE REAR AXLE CYLINDER

TRAVEL MOTOR

TRANSMISSION

T
P2 P1
P Pi1(Pump) Pi2(Pump)
Rs Pn2 Pn1

C6
D6 Pc6

TURNING DOZER
JOINT PS
Pd6 B5
Puo
C5 A5
D5 Pb5
Pc5
Pa5
SWING MOTOR OPT-B BUCKET
Pd5
DR5
C4 P05 P04

D4 DR3 B4
Pc41
Pb4
Pa4
Pd40
Pc40 ARM 1 Pc42
V3 ARM
REGEN Pb3
Pc3
DR2
Pa21
BOOM 2 ARM 2 Pd41
C2 B2
P D2
T2 Pc2
Pd2 Pb21 A2
ACC1 BRAKE VALVE DR1
AC1 ACC1GP ACC2 SWING Pb20
DR4
M2 BR1 Pa20
PS

BR2 P02
M BOOM 1
M1 P03 Patt
PS
P K C1 B1
P A1
TP
B D1 Pc1 Pb1
T
Pd1 Pa1
TRAVEL OPT-C
T P0 DR0
T3 SH
P1
(S/Motor)
PS T1
dr2 Ai
PGP P dr3 P3
T4(TGP)
P2 P1 Pu

ACCELERATOR
PEDAL RCV LEVER(LH) RCV LEVER(RH)

P T SWING P T ARM BUCKET P T BOOM

DOZER LEVER A1 A2 MAIN PUMP
P T PS PS

1 2 Pi1
(1) (3) (2) (4) (3) (1) (2) (4) (Pn2
Pc1(FW) Pd1(BW) MCV)
Pi2
a b d e f g h j Pc6 Pd6 (Pn1
MCV)
c
Pd2 Pc2 Pd40 Pb5 PS
Pc40 Pa5 PS Pb20 DR#, dr#
Pc3
Pa20
PS P1
SAFETY SOLENOID VALVE ENG
PO3 Pb4 Pu
(MCV) (MCV) (MCV) LEVER UP
B1
T2,T3,T4 P1
HYD P2
P4 PG(S/M) TANK
P3 PO(MCV)

P2
T(dr1) S2 S1 B3 A3
P1

LEVER DOWN LINE FILTER

140W9S3HC03

When the lever of the safety solenoid valve is moved upward, oil flows into the remote control valve
through solenoid valve and line filter.
When the lever of the safety solenoid valve moved downward, oil does not flows into the remote
control valve, because of blocked port.

3-8
 3. MAIN RELIEF PRESSURE CHANGE SYSTEM
DOZER/ OUTRIGGER CYLINDER ARM BUCKET
CYLINDER CYLINDER BOOM CYLINDER
OSCILLATING
FRONT AXLE REAR AXLE CYLINDER

TRAVEL MOTOR

TRANSMISSION

T
P2 P1
P Pi1(Pump) Pi2(Pump)
Rs Pn2 Pn1

C6
D6 Pc6

TURNING DOZER
JOINT PS
Pd6 B5
Puo
C5 A5
D5 Pb5
Pc5
Pa5
SWING MOTOR OPT-B BUCKET
Pd5
DR5
C4 P05 P04

D4 DR3 B4
Pc41
Pb4
Pa4
Pd40
Pc40 ARM 1 Pc42
V3 ARM
REGEN Pb3
Pc3
DR2
Pa21
BOOM 2 ARM 2 Pd41
C2 B2
P D2
T2 Pc2
Pd2 Pb21 A2
DR1
Auto power boost DR4
SWING Pb20
Pa20
P02
BOOM 1 Patt
P03 PS
C1 B1
A1
D1 Pc1 Pb1
Pd1 Pa1
TRAVEL OPT-C
P0 DR0
SH
(S/Motor)
PS T1
Ai P3
Cluster type 1 P2 P1 Pu Main relief valve

ACCELERATOR
PEDAL RCV LEVER(LH) RCV LEVER(RH)

P T SWING P T ARM BUCKET P T BOOM

DOZER LEVER A1 A2 MAIN PUMP
P T PS PS

1 2 Pi1
(1) (3) (2) (4) (3) (1) (2) (4) (Pn2
Pc1(FW) Pd1(BW) MCV)
Pi2
a b d e f g h j Pc6 Pd6 (Pn1
MCV)
c
Pd2 Pc2 Pd40 Pb5 PS
Pc40 Pa5 PS Pb20 DR#, dr#
Pc3
POWER BOOST Pa20
PS P1
SOLENOID VALVE
ENG
PO3 Pb4 Pu
(MCV) (MCV) (MCV)
B1
T2,T3,T4 P1
HYD P2
P4 PG(S/M) TANK
P3 PO(MCV)

P2
T(dr1) S2 S1 B3 A3
P1
LINE FILTER

140W9S3HC04

When the power boost switch on the left control lever is pushed ON, the power boost solenoid valve
is actuated, the discharged oil from the pilot pump flows into Pu port of the main relief valve in main
control valve ; then the setting pressure of the main relief valve is raises from 350 kgf/cm2 to 380
kgf/cm2 for increasing the digging power. And even when press continuously, it is canceled after 8
seconds.
When the auto power boost function is selected to enable on the cluster, the pressure of the main
relief pressure is automatically increased to 380 kgf/cm2 as working condition by the MCU. It is also
operated max 8 seconds.
3-9
 4. SWING PARKING BRAKE RELEASE

DOZER/ OUTRIGGER CYLINDER ARM BUCKET

CYLINDER CYLINDER BOOM CYLINDER
OSCILLATING
FRONT AXLE REAR AXLE CYLINDER

TRAVEL MOTOR

TRANSMISSION

T
P2 P1
P Pi1(Pump) Pi2(Pump)
Rs Pn2 Pn1

C6
D6 Pc6

TURNING DOZER
JOINT PS
Pd6 B5
Puo
C5 A5
D5 Pb5
Pc5
Pa5
SWING MOTOR
OPT-B BUCKET
SH Pd5
DR5
C4 P05 P04
PG
D4 DR3 B4
Dr Pc41
Pb4
Pa4
Pd40
GA GB ARM 1
Pc40 Pc42
Mu
V3 ARM
REGEN Pb3
Pc3
DR2
Pa21
A(CW) B(CCW) ARM 2 Pd41
BOOM 2
C2 B2
P D2
T2 Pc2
Pd2 Pb21 A2
ACC1 BRAKE VALVE DR1
AC1 ACC1GP ACC2 SWING Pb20
DR4
M2 BR1 Pa20
PS

BR2 P02
M BOOM 1
M1 P03 Patt
PS
P K C1 B1
P A1
TP
B D1 Pc1 Pb1
T
Pd1 Pa1
TRAVEL OPT-C
T P0 DR0
T3 SH
P1
(S/Motor)
PS T1
dr2 Ai
PGP P dr3 P3
T4(TGP)
P2 P1 Pu

ACCELERATOR
PEDAL RCV LEVER(LH) RCV LEVER(RH)

P T SWING P T ARM BUCKET P T BOOM

DOZER LEVER A1 A2 MAIN PUMP
P T PS PS

1 2 Pi1
(1) (3) (2) (4) (3) (1) (2) (4) (Pn2
Pc1(FW) Pd1(BW) MCV)
Pi2
a b d e f g h j Pc6 Pd6 (Pn1
MCV)
c
Pd2 Pc2 Pd40 Pb5 PS
Pc40 Pa5 PS Pb20 DR#, dr#
Pc3
Pa20
PS P1
ENG
PO3 Pb4 Pu
(MCV) (MCV) (MCV)
B1
T2,T3,T4 P1
HYD P2
P4 PG(S/M) TANK
P3 PO(MCV)

P2
T(dr1) S2 S1 B3 A3
P1
LINE FILTER

140W9S3HC05

When one of the RCV lever is tilted, the pilot oil flows into SH port through main control valve. This
pressure move spool so, discharged oil from pilot pump flows into swing motor PG port.
This pressure is applied to swing motor disc, thus the brake released.
When the all of the RCV lever are set in the neutral position, oil in the swing motor disc cylinder is
drained, thus the brake is applied.

3-10
 5. TRAVEL SPEED SELECTION SYSTEM
DOZER/ OUTRIGGER CYLINDER ARM BUCKET
CYLINDER CYLINDER BOOM CYLINDER
OSCILLATING
FRONT AXLE REAR AXLE CYLINDER

TRAVEL MOTOR

TRANSMISSION

T
P2 P1
P Pi1(Pump) Pi2(Pump)
Rs Pn2 Pn1

C6
D6 Pc6

TURNING DOZER
JOINT PS
Pd6 B5
Puo
C5 A5
D5 Pb5
Pc5
Pa5
SWING MOTOR OPT-B BUCKET
Pd5
DR5
C4 P05 P04

D4 DR3 B4
Pc41
Pb4
Pa4
Pd40
Pc40 ARM 1 Pc42
V3 ARM
REGEN Pb3
Pc3
DR2
Pa21
BOOM 2 ARM 2 Pd41
T2 C2 B2
P TRAVEL D2
TRAVEL Pc2
SPEED Pd2 Pb21 A2
CONTROL
VALVE ACC1 BRAKE VALVE SWING DR1
VALVE ACC1GP ACC2 Pb20
HIGH DR4
AC1 BR1 Pa20
SPEED BR2 P02
M2 BOOM 1
PS

M P03 Patt
PS
M1 C1 B1
P K A1
P D1 Pc1 Pb1
B
TP T Pd1 Pa1
TRAVEL OPT-C
P0 DR0
T SH
T3 (S/Motor)
P1
PS T1
dr2 Ai
PGP P dr3 P3
LOW SPEED T4(TGP)
P2 P1 Pu

ACCELERATOR
PEDAL RCV LEVER(LH) RCV LEVER(RH)

P T SWING P T ARM BUCKET P T BOOM

DOZER LEVER A1 A2 MAIN PUMP
P T PS PS

1 2 Pi1
(1) (3) (2) (4) (3) (1) (2) (4) (Pn2
Pc1(FW) Pd1(BW) MCV)
Pi2
a b d e f g h j Pc6 Pd6 (Pn1
MCV)
c
Pd2 Pc2 Pd40 Pb5 PS
Pc40 Pa5 PS Pb20 DR#, dr#
Pc3
Pa20
PS P1
ENG
PO3 Pb4 Pu
(MCV) (MCV) (MCV)
B1
T2,T3,T4 P1
HYD P2
P4 PG(S/M) TANK
P3 PO(MCV)

P2
T(dr1) S2 S1 B3 A3
P1
LINE FILTER

140W9S3HC06

When RH multifunction switch was placed in high or low speed position, the pressure oil from pilot
pump flows to travel speed solenoid valve through travel control valve, thus the transmission is
changed into high (P1) or low (P2) speed condition.

3-11
6. ARM REGENERATION CUT SYSTEM
DOZER/ OUTRIGGER CYLINDER ARM BUCKET
CYLINDER CYLINDER BOOM CYLINDER
OSCILLATING
FRONT AXLE REAR AXLE CYLINDER

TRAVEL MOTOR

TRANSMISSION

T
P2 P1
P Pi1(Pump) Pi2(Pump)
Rs Pn2 Pn1

C6
D6 Pc6

TURNING DOZER
JOINT PS
Pd6 B5
Puo
C5 A5
D5 Pb5
Pc5
Pa5
SWING MOTOR OPT-B BUCKET
Pd5
DR5
C4 P05 P04

D4 DR3 B4
Pc41
Pb4
Pa4
Pd40
Pc40 ARM 1 Pc42
ARM
V3 REGEN
Pb3
Pc3
DR2 ARM REGEN
Pa21 VALVE
BOOM 2 ARM 2 Pd41
C2 B2
P D2
T2 Pc2
Pd2 Pb21 A2
SWING DR1
Pb20
Arm regeneration DR4
Pa20
P02
BOOM 1 Patt
P03 PS
C1 B1
A1
D1 Pc1 Pb1
Pd1 Pa1
TRAVEL OPT-C
P0 DR0
SH
(S/Motor)
PS T1
Ai P3
Cluster type 1 P2 P1 Pu

ACCELERATOR
PEDAL RCV LEVER(LH) RCV LEVER(RH)

P T SWING P T ARM BUCKET P T BOOM

DOZER LEVER A1 A2 MAIN PUMP
P T PS PS

1 2 Pi1
(1) (3) (2) (4) (3) (1) (2) (4) (Pn2
Pc1(FW) Pd1(BW) MCV)
Pi2
a b d e f g h j Pc6 Pd6 (Pn1
MCV)
c
Pd2 Pc2 Pd40 Pb5 PS
Pc40 Pa5 PS Pb20 DR#, dr#
Pc3
Pa20
PS ARM REGENERATION P1
SOLENOID VALVE ENG
PO3 Pb4 Pu
(MCV) (MCV) (MCV)
B1
T2,T3,T4 P1
HYD P2
P4 PG(S/M) TANK
P3 PO(MCV)

P2
T(dr1) S2 S1 B3 A3
P1
LINE FILTER

140W9S3HC08

When the arm regeneration is selected to disable on the cluster, the arm regeneration solenoid
valve is activated. The pilot oil from pilot pump flows into Pb4 port in main control valve through
solenoid valve and the arm regeneration spool is shifted to right.
Then, the oil from arm regeneration passage returns to tank and the arm regeneration function is
deactivated.
When the arm regeneration is selected to enable on the cluster, the arm regeneration function is
activated and arm in operation speed is increased.
Refer to page 2-37 for the arm regeneration function.

3-12
7. BOOM PRIORITY SYSTEM
DOZER/ OUTRIGGER CYLINDER ARM BUCKET
CYLINDER CYLINDER BOOM CYLINDER
OSCILLATING
FRONT AXLE REAR AXLE CYLINDER

TRAVEL MOTOR

TRANSMISSION

T
P2 P1
P Pi1(Pump) Pi2(Pump)
Rs Pn2 Pn1

C6
D6 Pc6

TURNING DOZER
JOINT PS
Pd6 B5
Puo
C5 A5
D5 Pb5
Pc5
Pa5
SWING MOTOR OPT-B BUCKET
Pd5
DR5
C4 P05 P04

D4 DR3 B4
Pc41
Pb4
Pa4
Pd40
Pc40 ARM 1 Pc42
V3 ARM
REGEN Pb3
Pc3
DR2
Pa21
BOOM 2 ARM 2 Pd41
C2 B2
P D2
T2 Pc2
Pd2 Pb21 A2
Boom speed SWING DR1
Pb20
DR4
Swing Pa20
reducing P02
spool BOOM 1 Patt
P03 PS
C1 B1
A1
D1 Pc1 Pb1
Pd1 Pa1
TRAVEL OPT-C
P0 DR0
SH
(S/Motor)
PS T1
Ai P3
Cluster type 1 P2 P1 Pu

ACCELERATOR
PEDAL RCV LEVER(LH) RCV LEVER(RH)

P T SWING P T ARM BUCKET P T BOOM

DOZER LEVER A1 A2 MAIN PUMP
P T PS PS

1 2 Pi1
(1) (3) (2) (4) (3) (1) (2) (4) (Pn2
Pc1(FW) Pd1(BW) MCV)
Pi2
a b d e f g h j Pc6 Pd6 (Pn1
MCV)
c
Pd2 Pc2 Pd40 Pb5 PS
Pc40 Pa5 PS Pb20 DR#, dr#
Pc3
Pa20
PS P1
BOOM PRIORITY ENG
EPPR VALVE PO3 Pb4 Pu
(MCV) (MCV) (MCV)
B1
T2,T3,T4 P1
HYD P2
P4 PG(S/M) TANK
P3 PO(MCV)

P2
T(dr1) S2 S1 B3 A3
P1
LINE FILTER

140W9S3HC09

When carrying out the combined operation of swing and boom up, the boom up operating speed is
slower than normal operation.
To increase working efficiency, swing speed reducing system is used.
The pilot oil from pilot pump flow into P03 port in main control valve through boom priority EPPR
valve. P03 oil pressure moves swing reducing spool to upper position and oil flow rate to the swing
motor decreased.
Then, the boom up speed is increased. This is called the boom priority system.
The boom up speed can be adjusted by the cluster. Refer to page 3-12 of the operator's manual.

3-13
 GROUP 4 SINGLE OPERATION

1. BOOM UP OPERATION

DOZER/ OUTRIGGER CYLINDER ARM BUCKET

CYLINDER CYLINDER BOOM CYLINDER
OSCILLATING
FRONT AXLE REAR AXLE CYLINDER

TRAVEL MOTOR

TRANSMISSION

T
P2 P1
P Pi1(Pump) Pi2(Pump)
Rs Pn2 Pn1

C6
D6 Pc6

TURNING DOZER
JOINT PS
Pd6 B5
Puo
C5 A5
D5 Pb5
Pc5
Pa5
SWING MOTOR OPT-B BUCKET
Pd5
DR5
C4 P05 P04

D4 DR3 B4
Pc41
Pb4
Pa4
Pd40
Pc40 ARM 1 Pc42
V3 ARM
REGEN Pb3
Pc3
DR2 Pd41
Pa21 BOOM
BOOM 2 ARM 2 HOLDING
C2 RELIEF VALVE B2
P ACC1 BRAKE VALVE VALVE
T2 ACC2 D2 Pc2
ACC1GP Pb21 A2
Pd2
BR1
BR2 SWING DR1
AC1 DR4
Pb20
M2
Pa20
PS

P02
M BOOM 1
M1 P03 Patt
PS
P K C1 B1
P A1
TP
B D1 Pc1 Pb1
T
Pd1 Pa1
TRAVEL OPT-C
T P0 DR0
T3 dr2 SH
P1
PGP P T4(TGP) dr3 (S/Motor)
PS T1
Ai P3
P2 P1 Pu

HYDRAULIC TANK A1 A2
PUMP PUMP
PILOT
PUMP

140W9S3HC10

When the right control lever is pulled back, the boom spools in the main control valve are moved to
the up position by the pilot oil pressure from the remote control valve.
The oil from the A1 and A2 pump flows into the main control valve and then goes to the large
chamber of boom cylinders. At the same time, the oil from the small chamber of boom cylinders
returns to the hydraulic oil tank through the boom spool in the main control valve. When this
happens, the boom goes up. The excessive pressure in the boom cylinder head side is prevented
by relief valve. When the boom is up and the control lever is returned to neutral position, the circuit
for the holding pressure at the head side of the boom cylinder is closed by the boom holding valve.
This prevents the hydraulic drift of boom cylinder.

3-14
 2. BOOM DOWN OPERATION

DOZER/ OUTRIGGER CYLINDER ARM BUCKET

CYLINDER CYLINDER BOOM CYLINDER
OSCILLATING
FRONT AXLE REAR AXLE CYLINDER

TRAVEL MOTOR

TRANSMISSION

T
P2 P1
P Pi1(Pump) Pi2(Pump)
Rs Pn2 Pn1

C6
D6 Pc6

TURNING DOZER
JOINT PS
Pd6 B5
Puo
C5 A5
D5 Pb5
Pc5
Pa5
SWING MOTOR OPT-B BUCKET
Pd5
DR5
C4 P05 P04

D4 DR3 B4
Pc41
Pb4
Pa4
Pd40
Pc40 ARM 1 Pc42
V3 ARM
REGEN Pb3
Pc3
DR2 Pd41
Pa21
BOOM 2 ARM 2 RELIEF
C2 VALVE B2
P ACC1 BRAKE VALVE
T2 ACC2 D2 Pc2
ACC1GP Pb21 A2
Pd2
BR1
BR2 SWING DR1
AC1 DR4
Pb20
M2
Pa20
PS

P02
M BOOM 1
M1 P03 Patt
PS
P K C1 B1
P A1
TP
B D1 Pc1 Pb1
T
Pd1 Pa1
TRAVEL OPT-C
T P0 DR0
T3 dr2 SH
P1
PGP P T4(TGP) dr3 (S/Motor)
PS T1
Ai P3
P2 P1 Pu

HYDRAULIC TANK A1 A2
PUMP PUMP
PILOT
PUMP

140W9S3HC11

When the right control lever is pushed forward, the boom 1 spool in the main control valve is moved
to the down position by the pilot oil pressure from the remote control valve.
The oil from the A2 pump flows into the main control valve and then goes to the small chamber of
boom cylinders. At the same time, the oil from the large chamber of boom cylinders returns to the
hydraulic tank through the boom 1 spool in the main control valve.
When the down speed of boom is faster, the oil returned from the large chamber of boom cylinder
combines with the oil from the A2 pump, and flows into the small chamber of the cylinder.
This prevents cylinder cavitation by the negative pressure when the A2 pump flow can not match the
boom down speed. And the excessive pressure in the boom cylinder rod side is prevented by the
relief valve.

3-15
 3. ARM IN OPERATION

DOZER/ OUTRIGGER CYLINDER ARM BUCKET

CYLINDER CYLINDER BOOM CYLINDER
OSCILLATING
FRONT AXLE REAR AXLE CYLINDER

TRAVEL MOTOR

TRANSMISSION

T
P2 P1
P Pi1(Pump) Pi2(Pump)
Rs Pn2 Pn1

C6
D6 Pc6

TURNING DOZER
JOINT PS
Pd6 B5
Puo
C5 A5
D5 Pb5
Pc5
Pa5
SWING MOTOR OPT-B BUCKET
Pd5 MAKE UP
DR5 VALVE
C4 P05 P04
RELIEF
VALVE
D4 DR3 B4
Pc41
Pb4
Pa4
Pd40
Pc40 ARM 1 Pc42
V3 ARM
REGEN Pb3
Pc3
DR2 Pd41
Pa21
BOOM 2 ARM 2
C2 B2
P ACC1 BRAKE VALVE
T2 ACC2 D2 Pc2
ACC1GP Pb21 A2
Pd2
BR1
BR2 SWING DR1
AC1 DR4
Pb20
M2
Pa20
PS

P02
M BOOM 1
M1 P03 Patt
PS
P K C1 B1
P A1
TP
B D1 Pc1 Pb1
T
Pd1 Pa1
TRAVEL OPT-C
T P0 DR0
T3 dr2 SH
P1
PGP P T4(TGP) dr3 (S/Motor)
PS T1
Ai P3
P2 P1 Pu

HYDRAULIC TANK A1 A2
PUMP PUMP
PILOT
PUMP

140W9S3HC12

When the left control lever is pulled back, the arm spools in the main control valve are moved to the
arm in position by the pilot oil pressure from the remote control valve.
The oil from the A1 and A2 pump flows into the main control valve and then goes to the large
chamber of arm cylinder.
At the same time, the oil from small chamber of arm cylinder returns to the hydraulic oil tank through
the arm spool in the main control valve. When this happens, the arm rolls in.
The excessive pressure in the arm cylinder head side is prevented by relief valve.
The cavitation which will happen to the head side of the arm cylinder is also prevented by the make-
up valve in the main control valve.

3-16
 4. ARM OUT OPERATION

DOZER/ OUTRIGGER CYLINDER ARM BUCKET

CYLINDER CYLINDER BOOM CYLINDER
OSCILLATING
FRONT AXLE REAR AXLE CYLINDER

TRAVEL MOTOR

TRANSMISSION

T
P2 P1
P Pi1(Pump) Pi2(Pump)
Rs Pn2 Pn1

C6
D6 Pc6

TURNING DOZER
JOINT PS
Pd6 B5
Puo
C5 A5
D5 Pb5
Pc5
Pa5
SWING MOTOR OPT-B BUCKET
Pd5 RELIEF
DR5 VALVE
C4 P05 P04
MAKE UP
VALVE
D4 DR3 B4
Pc41
Pb4
Pa4
Pd40
Pc40 ARM 1 Pc42
ARM V3 ARM
HOLDING REGEN Pb3
VALVE Pc3
DR2 Pd41
Pa21
BOOM 2 ARM 2
C2 B2
P ACC1 BRAKE VALVE
T2 ACC2 D2 Pc2
ACC1GP Pb21 A2
Pd2
BR1
BR2 SWING DR1
AC1 DR4
Pb20
M2
Pa20
PS

P02
M BOOM 1
M1 P03 Patt
PS
P K C1 B1
P A1
TP
B D1 Pc1 Pb1
T
Pd1 Pa1
TRAVEL OPT-C
T P0 DR0
T3 dr2 SH
P1
PGP P T4(TGP) dr3 (S/Motor)
PS T1
Ai P3
P2 P1 Pu

HYDRAULIC TANK A1 A2
PUMP PUMP
PILOT
PUMP

140W9S3HC13

When the left control lever is pushed forward, the arm spools in the main control valve are moved to
the arm out position by the pilot oil pressure from the remote control valve.
The oil from the A1 and A2 pump flows into the main control valve and then goes to the small
chamber of arm cylinder. At the same time, the oil from the large chamber of arm cylinder returns to
the hydraulic oil tank through the arm spool in the main control valve. When this happens, the arm
rolls out. The cavitation which will happen to the rod side of the arm cylinder is also prevented by the
make-up valve in the main control valve. When the arm is roll out and the control lever is returned to
neutral position, the circuit for the holding pressure at the rod side of the arm cylinder is closed by
the arm holding valve. This prevent the hydraulic drift of arm cylinder.

3-17
 5. BUCKET IN OPERATION

DOZER/ OUTRIGGER CYLINDER ARM BUCKET

CYLINDER CYLINDER BOOM CYLINDER
OSCILLATING
FRONT AXLE REAR AXLE CYLINDER

TRAVEL MOTOR

TRANSMISSION

T
P2 P1
P Pi1(Pump) Pi2(Pump)
Rs Pn2 Pn1

C6
D6 Pc6

RELIEF
VALVE
TURNING DOZER MAKE UP
JOINT PS VALVE
Pd6 B5
Puo
C5 A5
D5 Pb5
Pc5
Pa5
SWING MOTOR OPT-B BUCKET
Pd5
DR5
C4 P05 P04

D4 DR3 B4
Pc41
Pb4
Pa4
Pd40
Pc40 ARM 1 Pc42
V3 ARM
REGEN Pb3
Pc3
DR2 Pd41
Pa21
BOOM 2 ARM 2
C2 B2
P ACC1 BRAKE VALVE
T2 ACC2 D2 Pc2
ACC1GP Pb21 A2
Pd2
BR1
BR2 SWING DR1
AC1 DR4
Pb20
M2
Pa20
PS

P02
M BOOM 1
M1 P03 Patt
PS
P K C1 B1
P A1
TP
B D1 Pc1 Pb1
T
Pd1 Pa1
TRAVEL OPT-C
T P0 DR0
T3 dr2 SH
P1
PGP P T4(TGP) dr3 (S/Motor)
PS T1
Ai P3
P2 P1 Pu

HYDRAULIC TANK A1 A2
PUMP PUMP
PILOT
PUMP

140W9S3HC14

When the right control lever is pulled left, the bucket spool in the main control valve is moved to the
roll in position by the pilot oil pressure from the remote control valve.
The oil from the A2 pump flows into the main control valve and then goes to the large chamber of
bucket cylinder.
At the same time, the oil from the small chamber of bucket cylinder returns to the hydraulic oil tank
through the bucket spool in the main control valve. When this happens, the bucket rolls in.
The excessive pressure in the bucket cylinder head side is prevented by relief valve.
The cavitation which will happen to the head side of the bucket cylinder is also prevented by the
make-up valve in the main control valve.

3-18
 6. BUCKET OUT OPERATION

DOZER/ OUTRIGGER CYLINDER ARM BUCKET

CYLINDER CYLINDER BOOM CYLINDER
OSCILLATING
FRONT AXLE REAR AXLE CYLINDER

TRAVEL MOTOR

TRANSMISSION

T
P2 P1
P Pi1(Pump) Pi2(Pump)
Rs Pn2 Pn1

C6
D6 Pc6
MAKE UP
VALVE RELIEF
DOZER VALVE
TURNING
JOINT PS
Pd6 B5
Puo
C5 A5
D5 Pb5
Pc5
Pa5
SWING MOTOR OPT-B BUCKET
Pd5
DR5
C4 P05 P04

D4 DR3 B4
Pc41
Pb4
Pa4
Pd40
Pc40 ARM 1 Pc42
V3 ARM
REGEN Pb3
Pc3
DR2 Pd41
Pa21
BOOM 2 ARM 2
C2 B2
P ACC1 BRAKE VALVE
T2 ACC2 D2 Pc2
ACC1GP Pb21 A2
Pd2
BR1
BR2 SWING DR1
AC1 DR4
Pb20
M2
Pa20
PS

P02
M BOOM 1
M1 P03 Patt
PS
P K C1 B1
P A1
TP
B D1 Pc1 Pb1
T
Pd1 Pa1
TRAVEL OPT-C
T P0 DR0
T3 dr2 SH
P1
PGP P T4(TGP) dr3 (S/Motor)
PS T1
Ai P3
P2 P1 Pu

A1 A2
PUMP PUMP
PILOT
PUMP

HYDRAULIC TANK

140W9S3HC15

When the right control lever is pushed right, the bucket spool in the main control valve is moved to
the bucket out position by the pilot oil pressure from the remote control valve.
The oil from the A2 pump flows into the main control valve and then goes to the small chamber of
bucket cylinder.
At the same time, the oil from the large chamber of bucket cylinder returns to the hydraulic oil tank
through the bucket spool in the main control valve. When this happens, the bucket rolls out.
The cavitation which will happen to the rod side of the bucket cylinder is also prevented by the
make-up valve in the main control valve.

3-19
 7. DOZER/OUTRIGGER UP OPERATION

DOZER/ OUTRIGGER CYLINDER ARM BUCKET

CYLINDER CYLINDER BOOM CYLINDER
OSCILLATING
FRONT AXLE REAR AXLE CYLINDER

TRAVEL MOTOR

TRANSMISSION

T
P2 P1
P Pi1(Pump) Pi2(Pump)
Rs Pn2 Pn1

C6
D6 Pc6

TURNING DOZER
JOINT PS
Pd6 B5
Puo
C5 A5
D5 Pb5
Pc5
Pa5
SWING MOTOR OPT-B BUCKET
Pd5
DR5
C4 P05 P04

D4 DR3 B4
Pc41
Pb4
Pa4
Pd40
Pc40 ARM 1 Pc42
V3 ARM
REGEN Pb3
Pc3
DR2 Pd41
Pa21
BOOM 2 ARM 2
C2 B2
P ACC1 BRAKE VALVE
T2 ACC2 D2 Pc2
ACC1GP Pb21 A2
Pd2
BR1
BR2 SWING DR1
AC1 DR4
Pb20
M2
Pa20
PS

P02
M BOOM 1
M1 P03 Patt
PS
P K C1 B1
P A1
TP
B D1 Pc1 Pb1
T
Pd1 Pa1
TRAVEL OPT-C
T P0 DR0
T3 dr2 SH
P1
PGP P T4(TGP) dr3 (S/Motor)
PS T1
Ai P3
P2 P1 Pu

A1 A2
PUMP PUMP
PILOT
PUMP

HYDRAULIC TANK
140W9S3HC16

When the dozer control lever is pulled back, the dozer spool in the main control valve is moved to
the dozer up position by the pilot oil pressure from the remote control valve.
The oil from the A1 pump flows into the main control valve and then goes to the small chamber of
rear actuator cylinder (dozer or outrigger).
The other case, the oil flows into the small chamber of front actuator cylinder (dozer or outrigger).
At the same time, the oil from the large chamber of dozer (outrigger) cylinders returns to the
hydraulic oil tank through the dozer spool in the main control valve. When this happens, the dozer
(outrigger) goes up.

3-20
 8. DOZER/OUTRIGGER DOWN OPERATION

DOZER/ OUTRIGGER CYLINDER ARM BUCKET

CYLINDER CYLINDER BOOM CYLINDER
OSCILLATING
FRONT AXLE REAR AXLE CYLINDER

TRAVEL MOTOR

TRANSMISSION

T
P2 P1
P Pi1(Pump) Pi2(Pump)
Rs Pn2 Pn1

C6
D6 Pc6

TURNING DOZER
JOINT PS
Pd6 B5
Puo
C5 A5
D5 Pb5
Pc5
Pa5
SWING MOTOR OPT-B BUCKET
Pd5
DR5
C4 P05 P04

D4 DR3 B4
Pc41
Pb4
Pa4
Pd40
Pc40 ARM 1 Pc42
V3 ARM
REGEN Pb3
Pc3
DR2 Pd41
Pa21
BOOM 2 ARM 2
C2 B2
P ACC1 BRAKE VALVE
T2 ACC2 D2 Pc2
ACC1GP Pb21 A2
Pd2
BR1
BR2 SWING DR1
AC1 DR4
Pb20
M2
Pa20
PS

P02
M BOOM 1
M1 P03 Patt
PS
P K C1 B1
P A1
TP
B D1 Pc1 Pb1
T
Pd1 Pa1
TRAVEL OPT-C
T P0 DR0
T3 dr2 SH
P1
PGP P T4(TGP) dr3 (S/Motor)
PS T1
Ai P3
P2 P1 Pu

HYDRAULIC TANK A1 A2
PUMP PUMP
PILOT
PUMP

140W9S3HC17

When the dozer control lever is pushed forward, the dozer spool in the main control valve is moved
to the dozer down position by the pilot oil pressure from the remote control valve.
The oil from the A1 pump flows into the main control valve and then goes to the large chamber of
rear actuator cylinder (dozer or outrigger).
The other case, the oil flows into the large chamber of front actuator cylinder (dozer or outrigger).
At the same time, the oil from the small chamber of dozer (outrigger) cylinders returns to the
hydraulic oil tank through the dozer spool in the main control valve. When this happens, the dozer
(outrigger) goes down.

3-21
 9. SWING OPERATION
DOZER/ OUTRIGGER CYLINDER ARM BUCKET
CYLINDER CYLINDER BOOM CYLINDER
OSCILLATING
FRONT AXLE REAR AXLE CYLINDER

TRAVEL MOTOR

TRANSMISSION

T
P2 P1
P Pi1(Pump) Pi2(Pump)
Rs Pn2 Pn1

C6
D6 Pc6

TURNING DOZER
JOINT PS
Pd6 B5
Puo
C5 A5
D5 Pb5
Pc5
Pa5
SWING MOTOR
OPT-B BUCKET
Pd5
SH DR5
C4 P05 P04
PG
D4 DR3 B4
Dr Pc41
Pb4
Pa4
Pd40
GA GB ARM 1
Pc40 Pc42
Mu
V3 ARM
REGEN Pb3
Pc3
DR2
Pa21
A(CW) B(CCW) ARM 2 Pd41
BOOM 2
C2 B2
P D2
T2 Pc2
Pd2 Pb21 A2
ACC1 BRAKE VALVE DR1
AC1 ACC1GP ACC2 SWING Pb20
DR4
M2 BR1 Pa20
PS

BR2 P02
M BOOM 1
M1 P03 Patt
PS
P K C1 B1
P A1
TP
B D1 Pc1 Pb1
T
Pd1 Pa1
TRAVEL OPT-C
T P0 DR0
T3
P1

PS T1
dr2 Ai
PGP P dr3 P3
T4(TGP)
P2 P1 Pu

RCV LEVER(LH) RCV LEVER(RH)

DR#, dr#
A2 PILOT
SWING ARM BUCKET BOOM
A1 PUMP
P T P T PUMP
PUMP

PO3 Pb4 Pu
(MCV) (MCV) (MCV)

(1) (3) (2) (4) (3) (1) (2) (4)

P4 PG(S/M)
a b d e f g h j P3 PO(MCV)
c P2
Pd2 Pc2 Pd40 Pc40 Pa5 Pb5 PS Pb20 HYDRAULIC TANK
Pc3 T(dr1) P1
Pa20
PS LINE FILTER
140W9S3HC18

When the left control lever is pushed left or right, the swing spool in the main control valve is moved
to the left or right swing position by the pilot oil pressure from the remote control valve.
Also the swing operation preference function is operated by the pilot pressure Pc3 (refer to page
2-34).
The oil from the A1 pump flows into the main control valve and then goes to the swing motor.
At the same time, the return oil from the swing motor returns to the hydraulic oil tank through the
swing spool in the main control valve.
When this happens, the upper structure swings to the left or right.
The swing parking brake, make up valve and the motor brake valve are provided in the swing motor.
The cavitation which will happen to the swing motor is also prevented by the make up valve in the
swing motor itself.

3-22
SWING CIRCUIT OPERATION

SWING MOTOR DEVICE

PARKING BRAKE

SH BRAKE OFF
BRAKE RELEASE VALVE
PG

BRAKE ON
Au
Dr

ANTI-INVERSION VALVE
MOTOR BRAKE VALVE
MAKE UP VALVE

GA GB

B(cw) A(ccw)
MAKE UP
PORT(Mu)

TO / FROM MAIN CONTROL VALVE

14W93HC18A

1) MOTOR BRAKE VALVE

Motor brake valve for the swing motor limits to cushion the starting and stopping pressure of swing
operation and controls the swing motor operating pressure.
2) MAKE UP VALVE
The make up valves prevent cavitation by supplying return oil to the vacuum side of the motor.
3) PARKING BRAKE
This is function as a parking brake only when all of the RCV lever (except dozer lever and travel
pedal) are not operated.
PARKING BRAKE "OFF" OPERATION
The parking brake is released by the pilot pressure oil from the pilot pump.
When the RCV lever placed in the operating position, the pilot oil flows into SH port through the
MCV. This pressure transferred to the brake release valve and the brake release valve is change
over. Then the pilot oil pressure PG lift the brake piston and release the parking brake.
PARKING BRAKE "ON" OPERATION
When all of the RCV lever placed in the neutral position, the pressure of the pilot oil passage down.
Then the brake release valve returned to the neutral position and the oil is returned from the brake
piston to the tank. And the brake is set to 'ON".
4) ANTI-INVERSION VALVE
This anti-inversion valve absorbs shocks produced as swing motion stops and reduced oscillation
cause by swing motion.

3-23
 10. TRAVEL FORWARD AND RE
REVERSE
VERSE O
OPERATION
PERATION
DOZER/ OUTRIGGER CYLINDER ARM BUCKET
CYLINDER CYLINDER BOOM CYLINDER
OSCILLATING
FRONT AXLE REAR AXLE CYLINDER

TRAVEL MOTOR

TRANSMISSION

T
P2 P1
P Pi1(Pump) Pi2(Pump)
Rs Pn2 Pn1

C6
D6 Pc6

TURNING DOZER
JOINT PS
Pd6 B5
Puo
C5 A5
D5 Pb5
Pc5
Pa5
SWING MOTOR OPT-B BUCKET
Pd5
DR5
C4 P05 P04

D4 DR3 B4
Pc41
Pb4
Pa4
Pd40
Pc40 ARM 1 Pc42
V3 ARM
REGEN Pb3
Pc3
DR2
Pa21
BOOM 2 ARM 2 Pd41
C2 B2
P T2 D2 Pc2
TRAVEL CONTROL Pd2 Pb21 A2
VALVE ACC1 BRAKE VALVE DR1
TRAVEL PILOT ACC1GP ACC2 SWING MAKE UP Pb20
DR4
AC1 SOLENOID BR1 VALVE Pa20
BR2 P02
M2 BOOM 1
PS

M P03 Patt
PS
M1 C1 B1
P K A1
P D1 Pc1 Pb1
B
TP T Pd1 Pa1
TRAVEL OPT-C
P0 DR0
T SH
T3 (S/Motor)
P1
PS T1
dr2 Ai
PGP P dr3 P3
T4(TGP)
P2 P1 Pu

ACCELERATOR
PEDAL RCV LEVER(LH) RCV LEVER(RH)

P T SWING P T ARM BUCKET P T BOOM

DOZER LEVER A1 A2 MAIN PUMP
P T PS PS

1 2 Pi1
(1) (3) (2) (4) (3) (1) (2) (4) (Pn2
Pc1(FW) Pd1(BW) MCV)
Pi2
a b d e f g h j Pc6 Pd6 (Pn1
MCV)
c
Pd2 Pc2 Pd40 Pb5 PS
Pc40 Pa5 PS Pb20 DR#, dr#
Pc3
Pa20
PS P1
ENG
PO3 Pb4 Pu
(MCV) (MCV) (MCV)
B1
T2,T3,T4 P1
HYD P2
P4 PG(S/M) TANK
P3 PO(MCV)

P2
T(dr1) S2 S1 B3 A3
P1
LINE FILTER

140W9S3HC19

When the RH multifunction switch is placed in forward or reverse position, the travel spool in the
main control valve is moved to the forward or reverse position by the pilot oil pressure from pilot
pump through the travel pilot solenoid of travel control valve. The oil from the A1 pump flows into the
main control valve and then goes to the travel motor. At the same time, the oil returned from the
travel motor returns to the hydraulic oil tank through the turning joint and travel spool in the main
control valve.
When this happens, the machine moves forward or reverse.
The cavitation which will happen to the travel motor is prevented by the make-up valve in the main
control valve.

3-24
TRAVEL CIRCUIT OPERATION

TRANSMISSION
T
X2 U
T G

X1
M2 M3
MA MB

OVERLOAD RELIEF VALVE

Gext.
COUNTER BALANCE VALVE
A(fw) S B(bw)

TURNING
JOINT

TO/FROM MAIN CONTROL VALVE

14W93HC19A

Valves are provided on travel motor to offer the following functions.

1) COUNTER BALANCE VALVE

When stopping the motor on a slope descending, this valve prevents the motor from over running.
2) OVERLOAD RELIEF VALVE
Relief valve limits the circuit pressure below 380 kgf/cm2 to prevent high pressure from being
generated at the time of stopping the machine. When stopping the motor, this valve sucks the oil
from lower pressure passage for preventing the negative pressure and the cavitation of the motor.

3-25
 11. A1 AND A2 AXLE BRAKE SYSTEM (SERVICE BRAKE)
DOZER/ OUTRIGGER CYLINDER ARM BUCKET
CYLINDER CYLINDER BOOM CYLINDER
OSCILLATING
FRONT AXLE REAR AXLE CYLINDER

TRAVEL MOTOR

TRANSMISSION

T
P2 P1
P Pi1(Pump) Pi2(Pump)
Rs Pn2 Pn1

C6
D6 Pc6

TURNING DOZER
JOINT PS
Pd6 B5
Puo
C5 A5
D5 Pb5
Pc5
Pa5
SWING MOTOR OPT-B BUCKET
Pd5
DR5
C4 P05 P04

D4 DR3 B4
Pc41
Pb4
Pa4
Pd40
Pc40 ARM 1 Pc42
V3 ARM
REGEN Pb3
Pc3
DR2
Pa21
BOOM 2 ARM 2 Pd41
C2 B2
P BRAKE SUPPLY VALVE
T2 D2 Pc2
Pd2 Pb21 A2
ACC1 BRAKE VALVE DR1
ACC1GP ACC2 SWING Pb20
DR4
AC1 BR1 Pa20
BR2 P02
M2 BOOM 1
PS

M P03 Patt
PS
M1 C1 B1
P K A1
P D1 Pc1 Pb1
B
TP T Pd1 Pa1
TRAVEL OPT-C
P0 DR0
T SH
T3 (S/Motor)
P1
PS T1
dr2 Ai
PGP P dr3 P3
T4(TGP)
P2 P1 Pu

ACCELERATOR
PEDAL RCV LEVER(LH) RCV LEVER(RH)

P T SWING P T ARM BUCKET P T BOOM

DOZER LEVER A1 A2 MAIN PUMP
P T PS PS

1 2 Pi1
(1) (3) (2) (4) (3) (1) (2) (4) (Pn2
Pc1(FW) Pd1(BW) MCV)
Pi2
a b d e f g h j Pc6 Pd6 (Pn1
MCV)
c
Pd2 Pc2 Pd40 Pb5 PS
Pc40 Pa5 PS Pb20 DR#, dr#
Pc3
Pa20
PS P1
ENG
PO3 Pb4 Pu
(MCV) (MCV) (MCV)
B1
T2,T3,T4 P1
HYD P2
P4 PG(S/M) TANK
P3 PO(MCV)

P2
T(dr1) S2 S1 B3 A3
P1
LINE FILTER

POWER TRAIN PUMP

140W9S3HC20

When the brake pedal (valve) is pushed, the discharged oil from the power train pump (P2) flows
into the front and rear axle brake disc through the solenoid valve of brake supply valve.
This pressure is applied to axle brake disc, thus the brake is applied.

3-26
 12. STEERING CIRCUIT OPERATION
DOZER/ OUTRIGGER CYLINDER ARM BUCKET
CYLINDER CYLINDER BOOM CYLINDER
OSCILLATING
FRONT AXLE REAR AXLE CYLINDER
Steering cylinder TRAVEL MOTOR

TRANSMISSION

T
P2 P1
P Pi1(Pump) Pi2(Pump)
Rs Pn2 Pn1

C6
D6 Pc6

TURNING DOZER
JOINT PS
Pd6 B5
STEERING VALVE Puo
C5 A5
D5 Pb5
Pc5
Pa5
SWING MOTOR OPT-B BUCKET
Pd5
DR5
C4 P05 P04

SPOOL D4 DR3 B4
Pc41
Pb4
Pa4
Pd40
Pc40 ARM 1 Pc42
V3 ARM
REGEN Pb3
Pc3
DR2
GEROTOR Pa21
BOOM 2 ARM 2 Pd41
C2 B2
P D2
T2 Pc2
Pd2 Pb21 A2
ACC1 BRAKE VALVE DR1
ACC1GP ACC2 SWING Pb20
DR4
AC1 BR1 Pa20
BR2 P02
M2 BOOM 1
PS

M P03 Patt
PS
M1 C1 B1
P K A1
P D1 Pc1 Pb1
B
TP T Pd1 Pa1
TRAVEL OPT-C
P0 DR0
T SH
T3 (S/Motor)
P1
PS T1
dr2 Ai
PGP P dr3 P3
T4(TGP)
P2 P1 Pu

ACCELERATOR
PEDAL RCV LEVER(LH) RCV LEVER(RH)

P T SWING P T ARM BUCKET P T BOOM

DOZER LEVER A1 A2 MAIN PUMP
P T PS PS

1 2 Pi1
(1) (3) (2) (4) (3) (1) (2) (4) (Pn2
Pc1(FW) Pd1(BW) MCV)
Pi2
a b d e f g h j Pc6 Pd6 (Pn1
MCV)
c
Pd2 Pc2 Pd40 Pb5 PS
Pc40 Pa5 PS Pb20 DR#, dr#
Pc3
Pa20
PS P1
ENG
PO3 Pb4 Pu
(MCV) (MCV) (MCV)
B1
T2,T3,T4 P1
HYD P2
P4 PG(S/M) TANK
P3 PO(MCV)

P2
T(dr1) S2 S1 B3 A3
P1
LINE FILTER

POWER TRAIN PUMP

140W9S3HC21

When the steering wheel is turned to the left or right, the spool within the steering valve turns left or
right hand direction : Because the spool is connected with steering column.
At this time, the oil discharged from the power train pump (P1) flows into steering cylinder through
spool and gerotor within the steering valve.
Then the steering direction is applied.

3-27
 13. RAM LOCK CIRCUIT OPERATION
DOZER/ OUTRIGGER CYLINDER ARM BUCKET
CYLINDER CYLINDER BOOM CYLINDER
OSCILLATING
FRONT AXLE REAR AXLE CYLINDER

TRAVEL MOTOR
CHECK
TRANSMISSION VALVE
LOCKING
VALVE
M

T
P2 P1
P Pi1(Pump) Pi2(Pump)
Rs Pn2 Pn1

C6
D6 Pc6

TURNING DOZER
JOINT PS
Pd6 B5
Puo
C5 A5
D5 Pb5
Pc5
Pa5
SWING MOTOR OPT-B BUCKET
Pd5
DR5
C4 P05 P04

D4 DR3 B4
Pc41
Pb4
Pa4
Pd40
Pc40 ARM 1 Pc42
V3 ARM
REGEN Pb3
Pc3
DR2
Pa21
BOOM 2 ARM 2 Pd41
C2 B2
P D2
T2 Pc2
Pd2 Pb21 A2
ACC1 BRAKE VALVE DR1
ACC1GP ACC2 SWING Pb20
DR4
AC1 BR1 Pa20
BR2 P02
M2 BOOM 1
PS

M P03 Patt
PS
M1 C1 B1
P K A1
P D1 Pc1 Pb1
B
TP T Pd1 Pa1
TRAVEL OPT-C
P0 DR0
T SH
T3 (S/Motor)
P1
PS T1
dr2 Ai
RAM LOCK PGP P dr3 P3
T4(TGP)
SOLENOID P2 P1 Pu

ACCELERATOR
PEDAL RCV LEVER(LH) RCV LEVER(RH)

P T SWING P T ARM BUCKET P T BOOM

DOZER LEVER A1 A2 MAIN PUMP
P T PS PS

1 2 Pi1
(1) (3) (2) (4) (3) (1) (2) (4) (Pn2
Pc1(FW) Pd1(BW) MCV)
Pi2
a b d e f g h j Pc6 Pd6 (Pn1
MCV)
c
Pd2 Pc2 Pd40 Pb5 PS
Pc40 Pa5 PS Pb20 DR#, dr#
Pc3
Pa20
PS P1
ENG
PO3 Pb4 Pu
(MCV) (MCV) (MCV)
B1
T2,T3,T4 P1
HYD P2
P4 PG(S/M) TANK
P3 PO(MCV)

P2
T(dr1) S2 S1 B3 A3
P1
LINE FILTER

140W9S3HC22

When the ram lock switch is selected on the switch panel 2, the ram lock solenoid is changed over.
Thus, the oil discharged from the pilot pump flows into oscillating cylinder through ram lock solenoid
and locking valve.
This pressure is applied to check valve and oscillating cylinder, thus the oscillating function is
operated (Ram lock released).

3-28
 GROUP 5 COMBINED OPERATION

1. OUTLINE

DOZER/ OUTRIGGER CYLINDER ARM BUCKET

CYLINDER CYLINDER BOOM CYLINDER
OSCILLATING
FRONT AXLE REAR AXLE CYLINDER

TRAVEL MOTOR

TRANSMISSION

T
P2 P1
P Pi1(Pump) Pi2(Pump)
Rs Pn2 Pn1

C6
D6 Pc6

TURNING DOZER
JOINT PS
Pd6 B5
Puo
C5 A5
D5 Pb5
Pc5
Pa5
SWING MOTOR OPT-B BUCKET
Pd5
DR5
C4 P05 P04

D4 DR3 B4
Pc41
Pb4
Pa4
Pd40
Pc40 ARM 1 Pc42
V3 ARM
REGEN Pb3
Pc3
DR2 Pd41
Pa21
BOOM 2 ARM 2
C2 B2
P ACC1 BRAKE VALVE
T2 ACC2 D2 Pc2
ACC1GP Pb21 A2
Pd2
BR1
BR2 SWING DR1
AC1 DR4
Pb20
M2
Pa20
PS

P02
M BOOM 1
M1 P03 Patt
PS
P K C1 B1
P A1
TP
B D1 Pc1 Pb1
T
Pd1 Pa1
TRAVEL OPT-C
T P0 DR0
T3 dr2 SH
P1
PGP P T4(TGP) dr3 (S/Motor)
PS T1
Ai P3
P2 P1 Pu

HYDRAULIC TANK A1 A2
PUMP PUMP
PILOT
PUMP

140W9S3HC23

The oil from the A1 and A2 pump flows through the neutral oil passage, bypass oil passage and
confluence oil passage in the main control valve. Then the oil goes to each actuator and operates
them. Check valves and orifices are located on these oil passage in the main control valve. These
control the oil from the main pumps so as to correspond to the operation of each actuator and
smooth the combined operation.

3-29
 2. COMBINED SWING AND BOOM UP OPERATION

DOZER/ OUTRIGGER CYLINDER ARM BUCKET

CYLINDER CYLINDER BOOM CYLINDER
OSCILLATING
FRONT AXLE REAR AXLE CYLINDER

TRAVEL MOTOR

TRANSMISSION

T
P2 P1
P Pi1(Pump) Pi2(Pump)
Rs Pn2 Pn1

C6
D6 Pc6

TURNING DOZER
JOINT PS
Pd6 B5
Puo
C5 A5
D5 Pb5
Pc5
Pa5
SWING MOTOR OPT-B BUCKET
Pd5
DR5
C4 P05 P04

D4 DR3 B4
Pc41
Pb4
Pa4
Pd40
Pc40 ARM 1 Pc42
V3 ARM
REGEN Pb3
Pc3
DR2 Pd41
Pa21
BOOM 2 ARM 2
C2 B2
P ACC1 BRAKE VALVE
T2 ACC2 D2 Pc2
ACC1GP Pb21 A2
Pd2
BR1
BR2 SWING DR1
AC1 DR4
Pb20
M2
Pa20
PS

P02
M BOOM 1
M1 P03 Patt
PS
P K C1 B1
P A1
TP
B D1 Pc1 Pb1
T
Pd1 Pa1
TRAVEL OPT-C
T P0 DR0
T3 dr2 SH
P1
PGP P T4(TGP) dr3 (S/Motor)
PS T1
Ai P3
P2 P1 Pu

HYDRAULIC TANK A1 A2
PUMP PUMP
PILOT
PUMP

140W9S3HC24

When the swing and boom up functions are operated, simultaneously the swing spool and boom
spools in the main control valve are moved to the functional position by the pilot oil pressure from the
remote control valve.
The oil from the A1 pump flows into the swing motor through swing spool and the boom cylinder
through boom 2 spool.
The oil from the A2 pump flows into the boom cylinders through the boom 1 spool in the right control
valve.
The super structure swings and the boom is operated.
Refer to page 3-13 for the boom priority system.

3-30
 3. COMBINED SWING AND ARM OPERATION

DOZER/ OUTRIGGER CYLINDER ARM BUCKET

CYLINDER CYLINDER BOOM CYLINDER
OSCILLATING
FRONT AXLE REAR AXLE CYLINDER

TRAVEL MOTOR

TRANSMISSION

T
P2 P1
P Pi1(Pump) Pi2(Pump)
Rs Pn2 Pn1

C6
D6 Pc6

TURNING DOZER
JOINT PS
Pd6 B5
Puo
C5 A5
D5 Pb5
Pc5
Pa5
SWING MOTOR OPT-B BUCKET
Pd5
DR5
C4 P05 P04

D4 DR3 B4
Pc41
Pb4
Pa4
Pd40
Pc40 ARM 1 Pc42
V3 ARM
REGEN Pb3
Pc3
DR2 Pd41
Pa21
BOOM 2 ARM 2
C2 B2
P ACC1 BRAKE VALVE
T2 ACC2 D2 Pc2
ACC1GP Pb21 A2
Pd2
BR1
BR2 SWING DR1
AC1 DR4
Pb20
M2
Pa20
PS

P02
M BOOM 1
M1 P03 Patt
PS
P K C1 B1
P A1
TP
B D1 Pc1 Pb1
T
Pd1 Pa1
TRAVEL OPT-C
T P0 DR0
T3 dr2 SH
P1
PGP P T4(TGP) dr3 (S/Motor)
PS T1
Ai P3
P2 P1 Pu

HYDRAULIC TANK A1 A2
PUMP PUMP
PILOT
PUMP

140W9S3HC25

When the swing and arm functions are operated, simultaneously the swing spool and arm spools in
the main control valve are moved to the functional position by the pilot oil pressure from the remote
control valve.
The oil from the A1 pump flows into the swing motor through swing spool and the arm cylinder
through arm 1 spool.
The oil from the A2 pump flows into the arm cylinder through the arm 2 spool of the right control
valve.
The super structure swings and the arm is operated.
Refer to page 2-35 for the swing operation preference function.

3-31
 4. COMBINED SWING AND BUCKET OPERATION

DOZER/ OUTRIGGER CYLINDER ARM BUCKET

CYLINDER CYLINDER BOOM CYLINDER
OSCILLATING
FRONT AXLE REAR AXLE CYLINDER

TRAVEL MOTOR

TRANSMISSION

T
P2 P1
P Pi1(Pump) Pi2(Pump)
Rs Pn2 Pn1

C6
D6 Pc6

TURNING DOZER
JOINT PS
Pd6 B5
Puo
C5 A5
D5 Pb5
Pc5
Pa5
SWING MOTOR OPT-B BUCKET
Pd5
DR5
C4 P05 P04

D4 DR3 B4
Pc41
Pb4
Pa4
Pd40
Pc40 ARM 1 Pc42
V3 ARM
REGEN Pb3
Pc3
DR2 Pd41
Pa21
BOOM 2 ARM 2
C2 B2
P ACC1 BRAKE VALVE
T2 ACC2 D2 Pc2
ACC1GP Pb21 A2
Pd2
BR1
BR2 SWING DR1
AC1 DR4
Pb20
M2
Pa20
PS

P02
M BOOM 1
M1 P03 Patt
PS
P K C1 B1
P A1
TP
B D1 Pc1 Pb1
T
Pd1 Pa1
TRAVEL OPT-C
T P0 DR0
T3 dr2 SH
P1
PGP P T4(TGP) dr3 (S/Motor)
PS T1
Ai P3
P2 P1 Pu

HYDRAULIC TANK A1 A2
PUMP PUMP
PILOT
PUMP

140W9S3HC26

When the swing and bucket functions are operated, simultaneously the swing spool and bucket
spool in the main control valve are moved to the functional position by the pilot oil pressure from the
remote control valve.
The oil from the A1 pump flows into the swing motor through the swing spool in the left control valve.
The oil from the A2 pump flows into the bucket cylinder through the bucket spool in the right control
valve.
The super structure swings and the bucket is operated.

3-32
 SECTION 4 ELECTRICAL SYSTEM

Group 1 Component Location ----------------------------------------------------------------------------------------- 4-1

Group 2 Electrical Circuit -------------------------------------------------------------------------------------------------- 4-3
Group 3 Electrical Component Specification ------------------------------------------------------------------ 4-38
Group 4 Connectors --------------------------------------------------------------------------------------------------------- 4-46
 SECTION 4 ELECTRICAL SYSTEM
GROUP 1 COMPONENT LOCATION

1. LOCATION 1
1 17
2 18
3 19
4 20
21

B
A
C

Cluster type 1
Travel pilot lamp

22
5 23
6
7

9
10
11
12
13
14
Cluster type 2
24
Travel pilot lamp
27 25
W
OR
K
28
EL
AV
TR

29
P

30
31
6
7
15
16
140W9S4EL01

1 Select switch 1 11 Breaker operation switch 21 USB socket

2 Cab light switch 12 Accel dial switch 22 Speaker
3 Work light switch 13 Multi function switch (RH) 23 Radio & USB player
4 Main light switch 14 Starting switch 24 Master switch
5 Select switch 2 15 Parking brake switch 25 Fuse & relay box
(Parking/Working/Traveling) 16 Travel/Work switch 27 RS232 & J1939 service socket
6 Hazard switch 17 Quick clamp switch 28 One touch decel switch
7 Ram lock switch 18 Beacon switch 29 Emergency engine stop switch
9 Air compressor switch 19 Overload switch 30 Power max switch
10 Hour switch 20 Breaker switch 31 Multi function switch (LH)

4-1
2. LOCATION 2

4
1 21 28

1
1 23

BOOM CAB SOLENOID VALVE COUNTERWEIGHT

2 8 9 10
12
22 27
14
13 26 BR1

16
BR2

3 15 BRAKE VALVE
29

5
6

25 20
7 24 Ai
19
Patt
Pd6

17
11
H
B

1
18
SHUTTLE BLOCK BOOM SAFETY VALVE MAIN CONTROL VALVE

140W9S4EL02

1 Lamp 11 Overload pressure sensor 21 Solenoid valve

2 Fuel sender 12 Heater relay 22 Pump EPPR valve
3 Fuel filler pump 13 Alternator 23 Boom priority EPPR valve
4 Beacon lamp 14 Start relay 24 Dozer pressure sensor
5 Battery 15 Air cleaner switch 25 Auto idle pressure switch
6 Battery relay 16 Back buzzer 26 Working pressure sensor
7 Horn 17 Boom up pressure sensor 27 Brake lamp pressure sensor
8 P1 pressure sensor 18 Swing pressure sensor 28 Rear camera
9 P2 pressure sensor 19 Attach pressure sensor 29 Machine control unit (MCU)
10 P3 pressure sensor 20 Travel pressure sensor a
※ Cluster type 1 only : 10, 17, 18

4-2
GROUP 2 ELECTRICAL CIRCUIT
CIRCUIT(1/3 CLUSTER TYPE 1
1)
CN-97 189 5R
0.8B G51
1 FNR_COM 1 AIR-CON
0.8Br 163 5W 57
2 FNR_REV 2 NO. DESTINATION CN-11 AC COMP RY
0.8YW 138 MASTER SW POWER
0.8B 199
3 TR1 3 1 CONTROLLER GND 1 2RW
0.8GOr 164 R/DRYER 188 PRE-HEAT CR-66

5R 189
5R 190
4 FNR_FWD 4 ANTI-RESTART 71 0.8Gr

85
BLOWER SIG

86
2

85
2

86
186 FUEL PUMP 1
2L 29

Pa
5 TR2 5 CN-81 0.8L 4 5 1

87a 87
4D

30

87a 87
3 AC 24V 3 5C 0.8G

30
0.8LOr 136 FUSE BOX 2

85

M
2

86
6 FNR_NEUTRAL 6 4 REVERSE FAN SIG 4 ILLUMINATION FUEL HEATER G26 0.8B 4E 0.8L
0.8L 7D 3

CN-29
201

87a 87
5
2Y 1

30
7 Hi BEAM_B+ 7 34 0.8V

87a

CR-35
5 CONTROLLER B+ CS-74

87a
5

10
1

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

CS-74
CR-7
30

2
86

85
4

87

1
CN-95

30
86

85
87
0.8LW 149

4
8 TURN SIG_COM 8 1.2G 193 5W 57

2
6 AC COMP

2
TRAVEL BZ

1
6 3 2 2

CN-96
30A

10A

20A

30A

20A

10A

10A

10A

10A

20A

10A

10A

10A

20A

30A

30A

20A

20A

30A

30A

10A

30A

10A

20A

20A

20A

20A

20A

20A

10A

10A
5

CN-61
0.8Gr 46

CR-36

87a
9 HORN 9 5W 191

CR-5
5

30
3

86

85
87
7 CONDENSOR FAN

B
7

A
1

1
CN-123

5
2

4
3

1
2
0.8L 146 G27 PARKING

CS-74B
1.2Br
0.8Y 9A

ROOM LAMP/CASSETTE
0.8B

0.8WOr
1.2G
1.2Br
10 WASHER

4
10

0.8V
8 ILLUMINATION 8 1

2RW
CIRCUIT BRAKER

1.2B
2L
2L

1
2
5B 0.8G

CR-15
11 WIPER WI

2W
11 2 CR-12 5R 190

177 0.8GrW
174 0.8ROr
175 0.8BOr
165 0.8BOr

CIGAR,SEAT HEAT
166

5
ENG STOP SOL(H)
0.8YW

2Br
2

4
3

0.8BOr
2

2Y
G32 2B
AIR CON/HEATER

2B
12 Lo BEAM 12 1

0.8Br
CS-74

0.8Y
BATTERY

194
193
REV. 5R 192

176
194

SWITCH PANEL
34 0.8V

G41

2W
5 1

BEACON LAMP
4 1

2R
ILLUMINATION
ILLUMINATION
29
29

FUEL HEATER
2W
2W

188
2

TRAVEL SOL.
AC& HEATER
14
55

START,STOP

SAFETY SOL
CONVERTER
WORK LAMP
CABIN LAMP

G31
CN-122

TURN LAMP

SOLENOIDE
SOLENOIDE
HEAD LAMP

6A
0.8V

MCU CONT.
START KEY
34A

1.2Or
CN-60

185
CN-98

CASSETTE

0.8BOr
G28 0.8B

CLUSTER

44A
3 60R 60B

CLUSTER

27
0.8V 41

180
6B
1

145
0.8L
1.2L
1 HEAD LAMP_COM 1 35 1.2LW

SPARE

WIPER
184 1.2V

WIPER
4

14A
211

HORN
0.8BrW 167

EPPR
MCU
2

CN-36
2 HEAD LAMP Hi BEAM 2 36 1.2G 3 2
0.8W 45 DO-7 0.8V 62A
5

186
150
3 WIPER Lo SPEED 3 FWD. MASTER SW CR-1

7A
1 12V X 2

7
0.8W 45A 0.8ROr 26B CR-30 TRAVEL SPEED
4 WIPER Hi 4 2 G11 1.2B
0.8Br 148 87a 30 86
5 WIPER INT 5 163 0.8Br CN-70 37B 1.2G TO:STARTER "B" TERM.

26 0.8ROr

31 0.8ROr

32 1.2ROr
36

23 0.8VOr

10 0.8YOr
CN-22 1.2G

17 0.8RW

20 1.2RW

1.2RW
30 1.2VW
13 1.2R
85

12 0.8Y
0.8GrW 131 2

19 0.8Or

21 0.8Gr

1.2Or
0.8V 62

33 1.2Br
14 2W
6 PARKING SIG

24 2RW
6

16 0.8R

18 0.8R

27 2.0R
201 2Y

22 1.2V

63 1.2V

28 1.2V

0.8Y
5A 1.2G

1.2L

0.8L
1 G22 0.8 B

25 2R
87

2Y

29 2L
0.8W 130 0.8ROr 26A 1
7 WORKING SIG 7 M
2 4C 0.8L
0.8Gr 137 86 BATT RY
8 TRAVEL SIG 8
WASHER P/P 4B 0.8L 87a 87 85
HIGH SPEED SOL.(M2)
30

3
8

9
0.8BW 134
9 RAMLOCK_ON 9 DO-3
0.8VW 129 REV.RY DO-4 37A 1.2G
10 RAMLOCK_AUTO 10 36A 1.2G 2
2 G12 1.2B
CR-29 G23 0.8 B 1
CN-99 1
135 87a 30 86
0.8L 164 0.8GOr
1 CRUISE SIG 1 DIODE
0.8YOr 10A 85 CD-43
2 HAZARD SW_LAMP 2 184 1.2V 1.2ROr 2A
87 CN-181 SUPPLY A
0.8YOr 50

PRESS
3 TURN_RH 3 4A 0.8L 35 1.2LW 1.2L 1
0.8YW 86 2 SIG B
51 4 0.8L 87a 87 85 1.2BW 4A
4 TURN_LH G24 0.8 B CD-18

P2
4 RETURN C
1.2B G52 30 1
5 GND 5
CD-42 1 1.2GrW
0.8L 91 FWD.RY 1.2ROr 2 Pa
6 WORKING BRAKE LP 6 LOW SPEED SOL.(M1) SUPPLY A

PRESS
0.8V 72 1.2G 3
7 RAMLOCK LAMP 7 DO-5 SIG B
0.8LOr 8B 35A 1.2LW

P1
8 LAMP 24V 8 2 1.2BW 4 ENG OIL PS
G25 0.8 B RETURN C
9 NC 9 1
DOZER ACT. PS CD-44
10 NC 10 15A 0.8B DIODE 1.2ROr 2
NC
2 Pa SUPPLY A CN-28
11 11 147 0.8WOr 1.2G 3 2 1.2VW
1 SIG B 1
12 NC

A3
12 1.2BW 4
0.8B G53 CD-50 RETURN C
13 HAZARD SW_LAMP 13
0.8B 61
14 PWT_COM 14 AC COMP
0.8B 61A CN-2
15 RAMLOCK SW_COM 15 46 0.8Y 1.2GrW 1
0.8BrW 133 1
16 RAMLOCK_OFF 16
2 CN-79
MULTI-FUNCTION SW 60 0.8V 1.2VW 2 3 2B
3 G
00 0.8 1.2 00 4 2W
4 F
86E 0.8 1.2LW 5 5 1.2LW
CN-5 81
5 H
0.8Y 00 0.8 1.2 00
1 CLUSTER_TX 1 6
0.8L 76 00 0.8 1.2 00 FUEL CUT OFF SOL
2 CLUSTER_RX 2 7
0.8B 140 64 2W 2W 4
3 CAMERA GND 3 8 CN-75
0.8W 141 56 Or 1.2Or 6 6 1.2Or
4 CAMERA SIG. 4 9 2
0.8Gr 21 75 Br 1.2Br 7 7 1.2Br
5 CLUSTER_IG 5 10 1
0.8RW 17 8 Y 1.2Y 8
6 CLUSTER_BATT.24V 6 11
9 L 1.2L 9 EPPR V/V
7 CAMERA 12V 7 12
SH 142 00 0.8 1.2 00 CD-17
8 SHIELD 8 13 1.2Y
0.8BW 60 68 2B 2B 3 8
2 m
9 P_DUMP 9 14 9 1.2L rp
0.8Br 143 00 0.8 1.2 00 1
10 QUICK COUPLER SW_NO 10 15
11 OVERLOAD PS 11 TACHO SENSOR
12 OVERLOAD SIG_MCU 12
13 ILLUMINATION 13
0.8YOr 10 ENGINE HARNESS-REAR
0.8W 73 CR-23 CN-45
14 HOUR METER SIG. 14
0.8G 82 68A CN-3 10
15
16
RS232_RX
RS232_TX
15
16
0.8R 77 64E
0.8B
0.8
1
1.2
1.2 11
10
11 Gr
B
1
M
M
2 2
0.8B 61B 66 0.8W 1.2 12
17 GND 17 3
0.8R 16 67 0.8Y 1.2 13 B+
18 WIPER CONT_BATT.24V 18 START RY
0.8V 62 4 FROM BATT.RY
19 WIPER CONT_WASHER P/P DRIVE 19 81A 0.8 1.2 14 STARTER
5
20 CAN_Hi 20 43 0.8 1.2 15
6
21 CAN_Lo 21 7
SH 53 15 R
22 Shield 22 8 RS-1 CN-74
0.8W 45 43 0.8 0.8 15 16
23 WIPER DRIVE SIG 23 9 2 B+
0.8ROr 26 43 0.8 0.8 15 3W/300 12A
24 WIPER IG 24 10 1 G
1.2ROr 32 1 P
25 HEAT SEAT SW_COM(IG) 25
1.2B G61
43 0.8
11
0.8 15
12 1.2W
2 L
3 ~
26 HEAT SEAT_GND 26 43 SH SH 15
15 12 U
1.2B 3 FI
27 CLUSTER GND 27
1.2V 63 4 NC
28 DC-DC CONVERTER_IG 28 CN-249
1.2Or 8 0.8B 24 CR-24
29 SW_COM(IG) 1 15R ALT.
29 0.8L 22
1.2B G62 13 V
30 GND 2
30 0.8Y 23
1.2B G63 3
31 GND 31 15R
0.8R 18 0.8Gr 21
32 FLASHER UNIT B+ 32 4
1.2Br 33
33 BEACON SW_COM(IG) 33 CAMERA PRE-HEAT RY Pre-heater
1.2V 54 54 2V
34 CABIN LIGHT 34 CL-21
0.8BOr 145 0.8Y 21 CD-8
35 START KEY SW_START 35 2 14 B
2W 211 0.8B 16A 1 C
36 START KEY SW_COM 36 1 15 G
0.8L 146 2
37 WASHER SIG 37 NUMBERPLATE LAMP
1.2V 54
38 CABIN LIGHT 38 CL-4 WATER TEMP SENDOR
0.8WOr 147 48 1.2R
39 DOZER PS 39 CN-216 1 Lo
1.2RW 213 G93 0.8B 49 1.2Or
40 REAR LAMP SW 40 1 2 Hi
0.8BrW 83 206 0.8Y G8 1.2B
41 RS232 RX2(GPS) 41 2 3 E
0.8GrW 78
42 RS232 TX2(GPS) 42 FRONT
0.8Br 148 HEAD LAMP RH
43 INT_WIPER 43 CN-220
0.8LW 149 G94 0.8B CL-3
44 FLASHER UNIT_L 44 1 48 1.2R
0.8BOr 150 205 0.8L 1 Lo
45 ILLUMINATION_SW PANEL 45 2 49 1.2Or
0.8Y 12 2 Hi
46 CASSETTE RADIO_BATT.24V 46 REAR G1 2B
0.8VOr 23 3 E
47 CASSETTE RADIO_IG 47
48 ECONO SW 48 HEAD LAMP LH
0.8BrW 151
49 SWITCH PANEL_HEAD LAMP 49 CN-151
0.8VW 152 156 0.8GrW
50 SWITCH PANEL_WORK LAMP 50 1 CABIN LAMP RY(COIL)
54A 2.0V
51 SW PANEL_FRONT/RIGHT 51 2 CABIN LAMP RY
25 2.0R
52 PRE-HEAT 52 3 CABIN LAMP RY
152 0.8VW
53 SW PANEL_REAR/RIGHT 53 4 WORK LAMP RY(COIL)

HARNESS RY
0.8G 155 183 2.0RG
54 SW PANEL_FRONT/LEFT 54 5 WORK LAMP RY
0.8GrW 156 24 2.0RW
55 SWITCH PANEL_CABIN LAMP 55 6 WORK LAMP RY
0.8BW 157 G4 1.2B
56 SW PANEL_REAR/LEFT 56 7 RELAY EARTH
1.2V 22 49A 1.2Or
57 SWITCH PANEL_IG 57 8 HEAD LMP RY HI
167 0.8BrW
58 ECONO SW 58 9 HEAD LMP RY HI(COIL)
0.8WOr 55 48A 1.2R
59 START SW_ACC 59 10 HEAD LMP RY LO
0.8Or 158
60 START SW_BR 60 11 NC
8C 1.2Or
12 OUTRIGGER RY
CN-7
1 JOYSTICK_SUPPLY 1 CN-152
92 0.8V
1 FUEL HEAT RY(COIL)
2 JOYSTICK_GND 2 185 2.0Br
2 FUEL HEAT RY
3 JOYSTICK_TILT SIGNAL 3 166 0.8YW
0.8ROr 32A 3 HEAD LMP RY LO(COIL)
4 NC 4 41 0.8V
0.8Or 8D 4 HEAD LMP RY (COIL)
5 BREAKER SW 5 205 0.8L
0.8BW 159 5 REAR LH RY
6 BREAKER SW 6 206 0.8Y
0.8B G71 REAR RH RY

HARNESS RY
7 HORN 6
7 207 0.8BrW
0.8Gr 46 7 FRONT LH RY
8 HORN 8 6 2.0Y
8 FUEL HEAT RY
9 BUTTON 2 9
9 FRONT RH RY
10 BUTTON 2 10 157 0.8BW
10 REAR LH RY(COIL)
11 BUTTON 1 11 33
11 REAR RH RY(COIL)
12 BUTTON 1 12 155 0.8G
12 FRONT LH RY(COIL)
13 AIR COMP SW 13
0.8GrW 160 13 FRONT RH RY(COIL)
14 ACCEL DIAL SUPPLY 14 7B 2L
0.8W 161 14 HEAD LAMP RY
15 ACCEL DIAL SIGNAL 15 151 0.8BrW
0.8B 162 15 HEAD LAMP POWER RY
16 ACCEL DIAL GND 16

CN-8 CN-12 CL-5

G2 2B 2B 2 1A 1.2R
1 NC 1 2 1
183 2RG 2R 1 2A 1.2B
2 CRAB SW 24V 2 1 2
3 CRAB SW COM 3 WORK LAMP
4 NC
1B 1.2R
4 1
1.2B G72 2B 1.2B
5 GND 5 2
CR-2
6 CRAB SW SIG 6 28 1.2V CL-6
30
7 ACCEL DIAL LED 7 28C 0.8V 87a 87 85
0.8ROr 26C 86
8 AIR COMP SW 8 47A 1.2G
87
9 NC 9 46A 1.2Gr
85 G3 1.2B CN-25
10 NC 10 1
30 86
11 NC
87a 47 1.2G
11 2
HORN
12 AIR COMP SW 12
HORN
G5 1.2B
RH CONSOL 1
47 1.2G
CN-4 2
1 JOYSTICK_SUPPLY 1 CN-20
2 JOYSTICK_GND 2
3 JOYSTICK_ROTATE SIGNAL 3
4 EM'CY STOP SW 4
0.8Y 132
5 POWER MAX SW 5
0.8B 66
6 POWER MAX SW 6
0.8GrW 139
7 ONE TOUCH DECEL 7 CR-62
1.2B 66A 89A 0.8GrW
8 ONE TOUCH DECEL 8 1
159 0.8BW 4 5 1
9 BUTTON 2 9 2
8A 0.8Or HYD TEMP
10 BUTTON 2 10 3 84 1.2LOr
2
11 BUTTON 1 11 4 2 1.2B
C
181 0.8Br 2
1
3
12 BUTTON 1 12 5 CD-1
13 EM'CY STOP SW 13 BREAKER
1.2B G73 FUEL LEVEL
14 SAFETY SW COM 14 85 1.2YOr
2
15 SAFETY SW NC 15 2T 1.2B
1.2G 196 1
16 SAFETY SW NO 16
CD-2
LH CONSOL AIR CLEANER SW
128 1.2YOr
CN-68 2S 1.2B Pa
1.2G 196
1
1.2VW 67 CD-10
2
SAFETY SOL
CN-140
1.2B G74 CR-47
1 30 1.2VW
0.8Br 143 30
2 30A 0.8VW 87a 87 85
86
QUICK COUPLER
87
197 0.8BOr
85
67 1.2VW 30 86
CL-16 87a
0.8Y 9
TA 1 SAFETY SOL RY
NC 2
0.8YOr 50
TU 3
0.8B G75
EH 4
0.8G 5
BU 5
0.8Gr 52
ST 6

REAR COMBI RH
CL-25
0.8YOr 10B
C 1
0.8B G76
E 2
0.8YOr 50A
T 3

FRONT COMBI RH
CL-15
0.8 YOr 10C
TA 1
NC 2
0.8YW 51

103

119

198
204

101

104
105
106
107
108

110

112

118

120

126
127

128

131

132

139
TU

129
86

56

165A

130
3

138
197

137
133
134

136
135
1Q

31
87
60

78

83
84

85
40

89
90

91

44
92

93

95
96

00
88
58A

58B
53A

94
G77
76

0.8B
58 2B

74
73
2

72
71
13
1.2RW 20

42
43

77

75
81
82

EH 4
0.8G 5

0.8GrW
BU 5
0.8GrW

0.8GrW

0.8WOr

0.8GrW
0.8BrW

0.8BrW

0.8GOr

0.8ROr
0.8ROr

0.8BrW
0.8BOr

0.8BOr

1.2YOr
0.8GW

0.8VW
0.8BOr
1.2LOr

0.8LOr

0.8RW

0.8RW
0.8LOr
1.2YOr

0.8BW

0.8YW
0.8BW

0.8YW

0.8BW

0.8BW
0.8BW

0.8LOr
0.8LW

0.8LW

0.8BW
G21

0.8Gr 52
0.8Gr
181

0.8Gr

0.8Gr

0.8Or

0.8W

0.8Gr
50B

G70

0.8Br

0.8Br

0.8W

0.8Or
0.8W

0.8W

0.8W

0.8B
51B

0.8G

0.8G
1.2R

0.8R
103
G7

1P

2P

0.8V
1.2B

1.2B

0.8B

1.2B

0.8Y

0.8V

0.8V

0.8V

0.8Y
88

87
89

0.8L

0.8L
0.8L

0.8L
ST 6
56A
3

SH

0.8
105

106

107

3B

56

3D
1M

2M

90
1C

2C

1H

2H

1N

2N
107

1B

2B

3A
1M

2M

96

95

3C
86
96
1H

2H

42A

0.8GrW

REAR COMBI LH
0.8ROr

0.8GW
0.8LOr
1.2RW
0.8BW

CD-38 CN-131
0.8YOr

CN-51

CN-53
0.8Br

2
CN-52

1 1.2B
0.8YW

1.2B
0.8B

0.8B

CL-24
37A
0.8B

1
1.2B

RETURN C
63
54

36

0.8BrW

9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40

10
11
12
13
14
15
16
17
18
19
20
21
22
BOOM UP PRESS SENSOR 23
24
ARM IN.OUT BUCKET IN PS25
TRAVEL PRESS SENSOR(A)26
27
PEDAL FWD PRESS.(AD IN)28
29
30
31
PEDAL REV PRESS(AD IN) 32
33
34
WORK PRESS SENSOR(A) 35
36
37
38
39
40

10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
0.8Y
1.2RW

1
2
3
4
5
6
7
8
9

1
2
3
4
5
6
7
8
9

1
2
3
4
5
6
7
8
9
2 1.2Br 0.8Br 94
1.2RW

0.8RW

127
119
0.8WOr

1.2RW

C 1
0.8ROr

0.8ROr

0.8ROr

0.8ROr

0.8ROr
0.8BOr

0.8Gr
0.8LOr

0.8ROr
0.8BOr

SIG+ B 2
0.8LW
0.8ROr

0.8V
0.8Or

G2
0.8LW

B
0.8V

120
0.8RW 112
3 1.2ROr
0.8Gr
0.8B

0.8B

0.8B

0.8B

0.8B

0.8ROr 1
0.8B

CN-15

E 2
0.8B

REVERSE FAN_MANUAL
BOOM PRIORITY EPPR+
A 3

BOOM PRIORITY EPPR-

SUPPLY

TRAVEL LEVER NEUTRAL

RIGHT ROTATE EPPR+
0.8YW 51
WORKING BRAK LAMP

RIGHT ROTATE EPPR-

W

OPTION AUTO IDLE A_IN

G

RS485+(TX)(CLUSTER
2

COOLING FAN EPPR+

V

B
1

TWOWAY PEDAL SOL

WORK BRAKE PRESS

REVERSE FAN_AUTO
SWING PRESS SENSOR

ONE TOUCH DECEL SW

LEFT ROTATE EPPR+
3

ATT. PRESS SENSOR

6
1

4
5

7
8
9
2

10
11
12

T
COOLING FAN EPPR-

RAMLOCK SW_AUTO
3
RESERVE_PWM IN01
RESERVE_PWM IN02

LEFT ROTATE EPPR-

WATER TEMP SENDOR

EPPR POWER IN 24V

2
1

POWER OUTPUT_5V

MODE SW_PARKING

0.8BW
ENG. OIL PRESS SW
GOV. POTENTION SIG.

4
TRAVEL SPEED SOL
ATT_CONFLUX SOL.

PUMP SHIFT EPPR+

RS485-(RX)_CLUSTER

WORKING BRAKE
RS232C1_RX_HRDT

0.8LW
CN-88

N2 PRESS SENSOR

PUMP SHIFT EPPR-

P1 PRESS SENSOR
FUEL LEVEL SENSOR

0.8W
OVERLOAD PRESS
CN-135

DO-6

RS232C2_RX_RCM

FUEL WARMER RY

RIGHT TILT EPPR+

4 1.2ROr
RS232C2_TX_RCM
CN-69

POWER BATT_24V

0.8ROr 1A
CD-3

CD-5

CD-7

WATER LEVEL SW
CD-24

CD-32

TRAVEL EPPR+(w)
ANTI RESTART RY

RIGHT TILT EPPR-

HYD.TEMP SENDER
CD-31

ATT FLOW EPPR+

1

TRAVEL EPPR-(w)

MODE SW_WORK
TACHO SENSOR+

RS232C1_TX_HRDT

TRAVEL ALARM SW
2

PARKING RY OUT

AIR CLEANER SW
N1 PRESS SENSOR
CN-76

POWER_24V OUT

POWER MAX SOL

P3 PRESS SENSOR

P2 PRESS SENSOR
CD-6

MODE SW_TRAVEL
PROGRAM DUMP

ATT_PRESS SOL.

ATT FLOW EPPR-

ARM REGEN SOL

RESERVE EPPR+

LEFT TILT EPPR+

REVERVE EPPR+
TACHO SENSOR-

ATT SAFETY SOL

1

GND_PRESSURE
2

5
TRAVEL BUZZER

LEFT TILT EPPR-

REVERVE EPPR-
2

REVERVE EPPR-

BRAKE OIL PRESS

POWER MAX SW
FRONT COMBI LH

CRAB SIGNAL"ON"
1

CD-4
2

RAMLOCK LAMP

SAFETY SOL RY

ACCEL DIAL SIG

ENG OIL FILTER

PREHEATER RY
C

C
A
B

A
B

A
B

A
B

A
B

TRAVEL Hi-Lo SW
RESERVE_A_IN
C

RAMLOCK SOL.
A
B

PWM OUTPUT1

5 1.2Y
PWM OUTPUT2

T/M OIL PRESS

C

CAN2 Lo_APTC
A
B

168
6
5
4
3
2
1

0.8Y

BLOWER SIG_IN
CAN2 Hi_APTC

RAMLOCK_ON
ACCEL ACT(+)

CAN1 Lo_ECM

ENG STOP RY

RAMLOCK_OFF
HOUR METER

CAN1 Hi_ECM

PREHEAT SW
ACCEL ACT(-)
BREAKER SOL(GND)

SIG+ C 6
ROTATE SIG.
ATT.CONFLUX SOL

CAN_SHIELD
ATT.SAFETY SOL

CR-63
RETURN

RETURN

RETURN

RETURN

RETURN
SUPPLY

SUPPLY

SUPPLY

SUPPLY

SUPPLY

CRUISE SW
RETURN

CN-133

CN-242
ATT PRESS SOL
SUPPLY
RETURN

GND_MAIN

GND_MAIN
SUPPLY

0.8Y 168
CRAB SOL
POWER IG

ALT. LEVEL

RETURN B

1
BREAKER SOL

1
2
SIG

1
SENSOR GND

TILT SIG.
M+

P+
NC

CL-27
M-

GND_5V

CL-26
P-

SENSOR 24V
SIG

SIG

SIG

SIG

SIG

2B G79
D_OUT

1 5 4
SIG

A
SIG

ATT.PS SIG

2 SIDE SIDE SUPPLY ARM POWER RAMLOCK DIODE

GND
1
5

0.8V 28B MARKER RH MARKER LH REGEN BOOST

SOL 24V
2

STOP LAMP
M

3 PRESS WORK(A) SWING BOOM

TRAVEL(A) PRESS DOZER
4 SENSOR SENSOR T/M UP
6

NC

NC
NC

0.8Gr BOOM ATT FLOW

2 3 52A BRAKE FAIL MCU PRIORITY
5 ACCEL ACTUATOR
STOP LAMP TWO WAY SOL
140W9S4EC01

4-3
·ELECTRICAL
ELECTRICAL CIRCUIT(2/3,
CIRCUIT CLUSTER TYPE 1
1)
Service Tool

RS232 P_DUMP
RS232_RX
RS232_TX
CAN2_Lo

CAN1_Lo
CAN2_Hi

CAN1_Hi
RELAY

IG 24V
CN-113 INTAKE M/ACT MODE(D/FOOT) MODE(VENT) BLOWER
00 TEMP M/ACT

GND
0.8B
1
00 0.8Or 2 2
2 7 7
1 4 1 4 BLOWER
3 M M 3 M M

3
7

1
7
BUZZER 5 5

M
G
H

B
E

A
F
J

4
2
5
6
7
5
6
7

5
6
7
1
2
3
4
5
6
7

1
2
3
4

1
2
3
4
1
2
3
4
DC/DC CONVERTER CIGARLIGHT
OVERLOAD SW CS-67

1
2
24V

4
HOUR METER

2
3
12V SOCKET

12
0.8BW
1

12

10
3

4
9
0.8G

0.8G

12V
0.8R
0.8V
0.8B
2 12

0.8
0.8
0.8
2

h
3

9
8
7
6
5
4
3
2
1

B GND
12V
24V

CN-48
10 0.8Br

CN-126

CL-2
4
HARNESS-AIRCON

CN-139

3
2
1
CN-138
10
9
8
7
6
5
4

11
3
2
1
5

2
1
2

8
C
A

CS-50

10
6

11
12
CN-21

0.8YOr
1.2ROr

9
4

8
1
2
3

6
7
3

0.8RW

1.2B
7

0.8W
7

0.8BW

0.8B
3 1 WIPER CUT 9
26

0.8G
0.8G
0.8G
0.8G

0.8G
1.2Or

1.2Or
0.8R
0.8V
0.8B
0.8R 10 NO.

84N 1.2B
CN-11 DESTINATION

1.2Or
8

1.2V
84M 1.2B

0.8VOr
2
4

0.8Or

0.8Or
28A 1.2Br
0.8GY 12

0.8V

0.8B
13A

84K
GND

24A
9 8 1 1

84L
5 3

5A
10

14
82A
0.8R 4a

CS-53

75
10 2 BLOWER SIG

15
20
20
20
20

16
2

19
4

75
25
9
4 10A 0.8Br

84J
0.8G 8 11 3 FUSE(IG)

2A 0.8B

77
12

11

77
5 3
0.8L 9 84H 0.8B 11 12
2 6 12 4 4 REVERSE FAN
6 M

0.8Or
QUICK COUPLING SW 5 5 FUSE(Battery)
6 6 DPS(COMPRESSOR)
WIPER MOTOR
CS-52 7 7 CONDENSOR FAN

11
1 8 8 ILLUMINATION
2 12
2
42 0.8BW
CN-141 3
0.8G 8 78 0.8G
FEED BACK 1 CN-157 4
0.8W 1
MOTOR DRIVE SIG 2 CN-17 ANTENA 5
0.8L 9
MOTOR DRIVE- 3 1 6
0.8R 1 0.8W 0.8W 22 52 0.8LOr 3
4 10 2 7 7
MOTOR DRIVE+
0.8B 2 2 0.8B 1.2B 84P 28B 1.2Br 9
GND 5 3 8
0.8GY/W 3 3 0.8GY/W 0.8ROr 23 4
VCC 6 4 9 8
0.8R 4 4 0.8R 0.8R 17 10
CONTINUE 24V 7 5 10
0.8V 5 5 0.8V 0.8V 18 78 0.8G
WASHER P/P 8 6 11
0.8L 6 6 0.8L 0.8L 32 84G 0.8B 11 12
WASHER SIG. 9 7 12
0.8BR 7 7 0.8BR 0.8Br 37
INT. SIG 10 8 ECONO SWITCH

10
11
12
13
14
15
16
17
18

10
11
12
13
14
0.8Or 11

1
2
3
4
5
6
7
8
9

1
2
3
4
5
6
7
8
9
WIPER CUT SW 11
CN-56

32
22
N.C 12 6 0.8RW RR
0.8GY 12 1 BATT.24V

0
0

0
0
TEMP MOTOR ACT(+)

DUCT SENSOR(GND)
TEMP MOTOR ACT(-)
13

DPS(COMPRESSOR)
FEED BACK

1
2
MODE M/ACT(FOOT)
RR

0.8W

BLOWER RELAY(Lo)
INLET MOTOR(REC)
INLET MOTOR(FRE)
0.8L
2

MODE M/ACT(PBR)
SIG3

MODE M/ACT(DEF)

AMBIENT SENSOR
TEMP M/ACT(PBR)

CONDENSOR FAN
MOTOR ACT(REF)

DUCT SENSOR(+)

W/TEMP SENSOR
MODE M/ACT(M+)

POWER TR BASE
WIPER MOTOR CONT. 81J 1.2B

MODE M/ACT(M-)

FET(FEED BACK)
RR

INCAR SENSOR
3 GND > > >

REVERSE FAN
ILLUMINATION
ILLUMINATION
1 0.8Y RR

DO-16
TX

BATTERY(+)
4

1
2

FET(GATE)

POWER IG
5 0.8Gr RR POWER TR AMBIENT INCAR W/TEMP
5 IG 24V SENSOR SENSOR SENSOR
HARNESS-WIPER MOTOR

IG 24V
RR DUCT
6 SIG2

GND
4 0.8W SENSOR

NC
NC

NC
RR
7 CAMERA SIG
2 0.8L RR
8 RX
CLUSTER AC & HEATER CONTROLLER(auto)
CN-5
1 0.8Y
1 1 MCU_RX
2 0.8L
2 2 MCU_TX
3 SH
3 3 CAMERA GND
4 0.8W
4 4 CAMERA SIG.
5 0.8Gr
5 5 FUSE
6 0.8RW
6 6 FUSE
7 7 CAMERA 12V
8 SH CS-1 CN-24
8 8 NC 1.2Gr 11 0.8G 2
9 0.8BW 2
9 9 P_DUMP(MCU) 0.8V 3 CN-10 NO. DESTINATION
10 0.8Br 1
10 10 QUICK COUPLING SOL CL-1 1 1 NC
11 0.8V DOOR S.W 1.2Gr 11 SPEAKER RH
11 11 OVERLOAD PS 3 2 2 NC
12 0.8VOr 0.8Y 1 1 0.8Y
12 12 MCU_OVERLOAD 2 3 3 FUSE
13 0.8YOr 1.2B 6B 2 0.8G
13 13 ILLUMINATION FUSE 1 4 4 CASSETTE_RH-
14 0.8W 3 0.8V
CS-73 14 14 MCU_HOURMETER CN-23 ROOM LAMP MG651032 5 5 CASSETTE_RH+
0.8B 84 15 0.8G 0.8Y 4 4 0.8Y
12 15 15 RS232_RX(MCU) 2 6 6 CASSETTE_LH-
12 11 0.8G 34A 16 0.8R 0.8L 5 5 0.8L
11 16 16 RS232_TX(MCU) 1 7 7 CASSETTE_LH+
82 0.8B 6 2.0B
10 17 17 GND SPEAKER LH 8 8 GND
10 17 0.8R 7 2.0B
8 9 18 18 FUSE CL-7 9 9 GND
4 18 0.8V 1.2BrW 8 8 1.2BrW
8 19 19 WASHER P/P 10 10 BEACON SW
9 1.2Or 26A 19 0.8V M 1.2B 6A 9 2.0V
7 7 20 20 CAN_Hi 11 11 CABIN LIGHT RY
3 20 0.8G 10 2.0V
6 21 21 CAN_Lo BEACON LAMP 12 12 CABIN LIGHT RY
21 SH
5 22 22 Shieeld
22 0.8W
4
0.8G 34 23 0.8ROr
23 23 WIPER DRIVE SIG CL-8
2
2.0V 9
CL-10
2
2V 10A 10 2.0V
CL-9
2
HARNESS-CAB
3 24 24 WIPER FUSE 2B 6 2B 7A 7 2B
24 1.2ROr 1 1 1
2 25 25 FUSE
12 2 CABIN LIGHT
1 26 26 NC
81H 2.0B
SPARE 27 27 GND
25 1.2V
CS-23 28 28 FUSE
0.8B 84 26 1.2Or
12 29 29 FUSE
12 11 0.8BrW 74 84F 1.2B
11 30 30 GND
84E 1.2B
10 31 31 GND
10 27 1.2R
8 9 32 32 FUSE
4 1.2Br 28 28 1.2Br
8 33 33 FUSE
9 29 1.2V
7 7 34 34 CABIN LAMP RY
3 30 0.8BOr
6 35 35 ANTI RESTART RY
31 1.2W
5 36 36 FUSE
1.2BrW 74 32 0.8L ACCEL DIAL LED
4 37 37 WASHER SIG CS-83
0.8B 19G

CN-279
29A 0.8V 12 CS-26A

1
2
3 38 38 CABIN LAMP RY 12 11 0.8Or 18A
33 0.8WOr 11 5E 0.8BW
2 39 39 DOZER PS 2
12 2 34 0.8G 10 4E 0.8G
1 40 40 REAR WORK LAMP 1
10 0.8G 15

0.8ROr
35 0.8BrW 8 9
BEACON LAMP SW 41 RS232 RX2 BREAKER

0.8B
41 4 0.8V 16
CN-125A 36 0.8GrW 8
1.2W 31 42 42 RS232 TX2 9 0.8BrW 17
BATTERY POWER 1 37 0.8Br 7 7 CN-156
1.2R 55 43 43 INT_WIPER 3 19 1.2B

19F
32
KEY "IG" 2 38 0.8LW 6 2
44 44 MULTI-FUNCTION SW 31 1.2ROr
NC 3 39 0.8BOr 5 1
0.8BrW 35 45 45 ILLUMINATION RY 0.8Or 18
RX232(1)-TX 4 40 0.8Y 4 AIR SEAT
0.8B 82 46 46 FUSE 0.8Gr 20
RX232(1)-GND 5 41 0.8VOr 3
47 47 FUSE CN-8 NO. DESTINATION
RX232(2)-RX 6 42 0.8BW 2 15 0.8G
48 48 ECONO SW 12 1 1 1 NC
RX232(2)-TX 7 43 0.8BrW 1 16 0.8V
49 49 HEAD LAMP RY 2 2 FUSE
RX232(2)-GND 8 44 0.8VW CRAB SW 17 0.8BrW
0.8GrW 36 50 50 WORK LAMP RY 3 3 CRAB COM
RX232(1)-RX 9 45 0.8L 18 0.8Or
51 51 Front/Right CS-99 4 4 NC
NC 10 46 0.8BOr 0.8B 19A 19 1.2B
0.8B 84A 52 52 CAN_LO 12 5 5 NC
MAIN GND 11 47 0.8Br 12 11 0.8GW 21A 20 0.8Gr
0.8B 84R 53 53 Rear/Right SOL 11 6 6 CRAB SIG_MCU
MAIN GND 12 48 0.8G 32 0.8ROr
CR-11 54 54 Front/Left 10 7 7 ILLUMINATION
RMS 0.8LW 38 49 0.8GrW 10 22 0.8L
L 1 55 55 CABIN LAMP RY 8 9 8 8 NC
G 1.2R 27 50 4 0.8L 22 23 0.8VW
2 0.8BW
B 56 56 Rear/Left SOL 8 9 9 DPF REGEN
NO. DESTINATION CN-10 0.8B 84D 51 0.8V 9 0.8L 22A 24 0.8R
E 3 57 57 FUSE 7 7 10 10 DPF COM
1 NC 1 52 0.8LOr 3 25 0.8LW
FLASHER UNIT 58 58 CAN_HI 6 11 11 DPF INHIBIT
2 NC 2 53 0.8WOr 26 0.8RW
0.8Y 40A 59 59 POWER RY 5 12 12 AIR COMP RY
3 ROOM LAMP 24V 3 54 0.8Or 0.8GW 21
0.8BW 56 60 60 BATT. RY 4
4 SPEAKER RH- 4 0.8RW 26
0.8Gr 59 3
5 SPEAKER RH+ 5
0.8BOr 72 2
12 1
6
7
SPEAKER LH-
SPEAKER LH+
6
0.8Or 73
NO. DESTINATION
1 HARNESS-RH CONSOLE
7
84 2B
CN-170 AIR-COMP
1.2B 84C 15 0.8G
8 GND 8 1 1 CAMERA POWER
1.2B 84B 16 0.8V
9 GND 9 2 2 CAMERA GND CS-100
1.2BrW 74 17 0.8BrW 1 NO.
10 BEACON LAMP 10 3 3 CAMERA SIG3 CN-7 DESTINATION
1.2V 29B 29 2V 18 0.8Or 2
11 CABIN LIGHT 11 4 CAMERA SIG2 1 1 NC
4
1.2V 29 3 2 2 NC

0
12 CABIN LIGHT 12 5 5 NC 0.8VW 23
4 3 3 NC
HARNESS-CABIN 6 6 NC

0,1
32 0.8ROr 31 1.2ROr
5 4 4 FUSE
7 7 ECONO 0.8R 24 0.8G 4 0.8G
22 0.8L 4 R 6 4
8 8 PRE-HEAT BREAK 1 5 5 BREAKER SW
B 0.8BW 5 5 0.8BW
6 7 2 6 6 BREAKER RY
0.8R 24A CS-26 0.8B 6 6 0.8B
8 1 7 7 GND
HORN
R 0.8Grw 7 7 0.8Grw
10 I 9 2 8 8 HORN RY
0.8LW 25 CS-5 0.8L 8 8 0.8L
HARNESS-RH CONSOL 8 10
2 L 0.8L 9 9 0.8L
9 9 NC
11 10 10 NC
12 11 0.8Br 30 0.8Gr 10 10 0.8Gr
12 11 11 NC
DPF
1 Gr 0.8Gr 11 11 0.8Gr
12 12 NC
CN-142 13 13 AIR COMP RY
0.8Gr 12 12 0.8Gr
+ A 14 14 MCU_5V
CS-2 0.8W 13 13 0.8W
31 1.2W S B 15 15 MCU_ACCEL SIG.

H0 I
1 0.8B 14 14 0.8B
54 0.8Or - C 16 16 MCU_SUPPLY GND
0, I

2
55 1.2R ACCEL DIAL
4
H
3
4 1 BR ACC
B

2
5 3
30 0.8BOr
6
ST C

5
6
START KEY SW

CN-116
33 0.8WOr
12 DOZER PS
81G 1.2B
11 GND
51 0.8V
10 POWER
47 0.8Br CS-33
9 Rear/Right 6 6
50 0.8BW
8 Rear/Left 5 5
45 0.8L
48 0.8G
7 Front/Right 4 4 HARNESS-LH CONSOLE
6 Front/Left 3 3
46 0.8BOr
5 PRE-HEAT 2 2
49 0.8GrW
4 CABIN LAMP 1 1
44 0.8VW CN-4 NO. DESTINATION
3 WORK LAMP
43 0.8BrW EM'CY STOP SW 1 1 NC
2 HEAD LAMP
39 0.8BOr 2 2 NC
1 ILL
SWITCH PANEL 3 3 NC
4 4 NC
0.8Y 4 4 0.8Y
power 1 5 5 MCU_POWER MAX
max B 0.8B 5 5 0.8B
CN-125 CN-125 2 6 6 MCU_SIG.GND
31A 1.2W cs-29 0.8Grw 6 6 0.8Grw
1 1 1 7 7 MCU_DECEL
55 1.2R R 77 decel R 0.8B 7 7 0.8B
2 2 2 8 8 MCU_SIG.GND
81F 1.2B cs-19 0.8L 8 8 0.8L
3 3 9 9 NC
53 0.8WOr R 77 2 L 0.8L 9 9 0.8L
4 4 10 10 NC
0.8Gr 10 10 0.8Gr
GPS CONN. 11 11 NC
1 Gr 0.8Gr 11 11 0.8Gr
12 12 NC
CS-4 13 13 NC
36E

36E

0.8B 12 12 0.8B
12F

81C

81E
25
68
18

B C
HARNESS-RH SIDE
63
31

41

A 14 GND
56
57

40
13

59

14
62

0.8V 13 13 0.8V
B 15 15 NC
0.5ROr

0.8G 14 14 0.8G
0.8VOr

0.8BOr

0.8YOr
0.5BW
0.5GY

0.8BW
0.5YL

0.5LY

0.5Lg

0.8Gr

0.8Or

C 16 16 SAFETY SOL
0.5V

0.5V

0.5B

0.8Y

0.8B

A
SAFETY SW
CN-246

CN-27A

CN-27

CS-20
12 0.8B
1

4
5

10
11
12
13
14
15
16
2

4
5

8
3

6
10

1
2
3
4
5
6
7

9
8

A C B

B
15 0.8Br
REMOCON GND

C A
SPK FRT RH+

SPK FRT LH+

SPK FRT RH-
SPK FRT LH-

REMOCON+

SAFETY SW
USB(GND)

BACK UP+
AUX GND

AUX GND

TEL MUTE
USB GND
USB(D+)
USB(D-)

ANT 12V
USB D+
AUX S1

USB 5V
AUX S2

USB D-

AUX R
AUX L
USB+

GND
ACC

ILL+
NC
NC
NC

NC

ILL-
NC

NC

NC

USB & SOCKET ASSY REMOTE ASSY RADIO & USB PLAYER

140W9S4EC02

4-4
·ELECTRICAL
ELECTRICAL CIRCUIT(3/3,
CIRCUIT CLUSTER TYPE 1
1)

MULTI-FUNCTION SW

LEFT LEVER RIGHT LEVER

FRONT RH FRONT LH REAR RH HEAD LAMP

REAR LH POWER HEAD LAMP LO HEAD LAMP HI WORK LAMP CABIN LAMP FUEL HEATER

3
1

3
1

3
1

3
1

3
1

3
1

3
1

3
1
3
1

3
1
4
2

4
2

4
2

4
2

4
2

4
2

4
2

4
2
4
2

4
2
CR-81

CR-82

CR-83

CR-84

CR-13
1

4
2
3

CR-78

CR-14
COM

COM

COM

COM

4
GND

2
3

4
2
3
TR2

TR1

CR-46
INT

WA

4
2
3
HO

COM

CR-9
B+
WI

Lo

Lo

1
Hi

Hi

2
3

4
2
3

CR-4

4
R

N
R

2
3
F
L

4
1

2
3
4

1
2
3

4
2
3
0.8BrW
0.8Gr

0.8GrW
0.8Y
0.8Or
0.8Or

0.8BrW

0.8RW
0.8VW
0.8Or
0.8Or

0.8BW
0.8Or
0.8Or
12

0.8L
0.8Br
(2)

(1)

(4)

0.8L

0.8BrW
10

11

0.8G

0.8Or
1.2Or

2.0Br
0.8R
14 0.8YW
6
5

9
8
7

7
5
3

2RW
4

0.8V
2.0Y
0.8Y
2RG
1.2Or
1.2V
25A 0.8L

2R
1.2L

2V
1.2B
1.2R
7A 0.8B
26A 1.2V

1.2V
11K
11L

11H

11E
11F
11J

19A
20
24

11A

3A
18

17
23

22

12
19

13
25
16
11
21

2
3
26

1
15

10

26

6A
9
7

5
4
11
12

11
12
10

10
1

1
8
9

8
9
3
4

3
4

3
4
2

5
7

7
6

6
27
17

09

16
15
14
13
12
11
10
27
26
08
25
07

27
06
05
04
27
23
03
02
01
10
01
CN-97
8 7 9 1 1 GND
02
3 8 24 2 2 REV RY.
03 CN-151 NO. DESTINATION
2 7 35 3 3 MCU CN-53
1 1 0.8GrW
04 1 1 FROM CABIN LAMP SIG
6 26 4 4 FWD RY. 2 2.0V
6 2 2 TO:CABIN LAMP
05 3 2.0R
5 5 08 5 5 TRAVEL SPEED RY. 3 3 CABIN LAMP FUSE
4 06 4 0.8VW
6 MCU CN-53 4 4 FROM WORK LAMP SIG
4 6 5 2RG
07 5 5 TO:WORK LAMP
3 25 7 7 FUSE 24V 6 2RW
08 6 6 WORK LAMP FUSE
8 8 FLASHER UNIT 7 1.2B
2 08 7 7 EARTH
09 8 1.2Or
9 9 HORN RY. 8 8 TO:HEAD LAMP HI
1 9 0.8BrW
10 9 9 FROM HEAD LAMP HI SIG
10 10 WIPER MOTOR CONTROLLER 10 1.2R
HARZARD SW 11 10 10 TO:HEAD LAMP LO
11 11 NC 11
12 11 NC
11 1.2Or
12 12 HEAD LAMP RY. 12 12 SOL.FUSE

CN-152
12 0.8V
1 1 FUEL HEATER SIG
13 CN-98 13 2.0Br
2 2 TO:FUEL HEATER
1 14 0.8YW
1 HEAD LAMP POWER RY. 3 3 FROM HEAD LAMP LO SIG
14 15 0.8BrW
2 2 HEAD LAMP Hi RY. 4 4 FROM HEAD LAMP SIG
15 16 0.8L
5 5 TO:REAR LH SOL
3 3 WIPER MOTOR CONTROLLER 17 0.8Y
16 6 6 TO:REAR RH SOL
4 4 WIPER MOTOR CONTROLLER 18 0.8BrW
36 7 7 TO:FRONT LH SOL
17 19 2.0Y
A 5 5 WIPER MOTOR CONTROLLER 8 8 FUEL HEATER FUSE
18 18 20 0.8Gr
6 MCU CN-53
9 9 TO:FRONT RH SOL
B 6 21 0.8BW
19 19 10 10 FROM REAR LH SIG
C 7 7 MCU CN-53 22 0.8Br
11 FROM REAR RH SIG
20 11
20 23 0.8G
D 8 8 MCU CN-53 12 12 FROM FRONT LH SIG
21 24 0.8L
9 9 MCU CN-53 13 13 FROM FRONT RH SIG
22 25 2.0L
14 14 HEADLAMP FUSE
10 10 MCU CN-53 25 2.0L
15 15 PANEL SWITCH

CN-99 HARNESS-RELAY BOARD

23
1 1 MCU CN-53
24
2 2 FUSE 24V
25
3 3 REAR COMBI LAMP
26
4 4 REAR COMBI LAMP
27
5 5 GND
37 28
A 6 6 MCU CN-52
38 29
OFF B 7 7 MCU CN-52 NO. CN-15 NO. DESTINATION
21 30 CD-69 CN-15 DESTINATION CD-69
1.2ROr 1
1.2ROr 1 1 MCU_POWER 24V
ON C 8 8 FUSE 24V SUPPLY A 1 1 MCU_POWER 24V SUPPLY A 1

ATT.
22 1.2BW 2

ATT.
0.8BW 2 SIG B 2 2 MCU
AUTO D 9 9 NC SIG B 2 2 MCU 1.2BW 3
1.2BW 3
26

18

28

27

14

29

25

RETURN C 3 3 MCU RETURN C 3 3 MCU

10 10 NC
4 MCU_GND
CN-236 4 4 MCU_GND 4
1.2LOr 4

PRESS
11 11 NC 1 5 5 MCU 5 5 MCU

ATT.
1.2Or 5 6 6 FUSE
12 12 NC 2 6 6 FUSE
35 6 7 7 MCU
13 13 GND CN-149 7 7 MCU

SAFETY
1.2Br 7 8 8 MCU
36 1 8 8 MCU

SOL.
ATT.
14 14 GND 1.2Or 9 9 NC
37 2 9 9 NC
15 15 GND 10 CN-66 10 10 NC
CN-237 10 NC 1.2B 4
38

CONFLUX
1.2GW 11 1 11 11 NC
16 16 MCU CN-53 1 11 NC 1.2Br 5
1.2Or 12 2 12 12 NC
12 NC

ATT.
2
27 27 BREAKER SOL

30 30
HARNESS-TWO WAY HARNESS-BREAKER

140W9S4EC03

4-5
·ELECTRICAL
ELECTRICAL CIRCUIT(1/3,
CIRCUIT CLUSTER TYPE 2
2)
CN-97 189 5R
0.8 00
1 FNR_COM 1 AIR-CON
0.8Br 163 5W 57
2 FNR_REV 2 NO. DESTINATION CN-11 AC COMP RY POWER
0.8YW 138 0.8B 199 MASTER SW
3 TR1 3 1 CONTROLLER GND 1 2RW
0.8GOr 164 R/DRYER 188 PRE-HEAT ANTI-RESTART CR-66
0.8G 111

5R 189
5R 190
4 FNR_FWD 4 71 0.8Gr

85
BLOWER SIG FUEL PUMP

86
2

85
2

86
186 1
2L 29

Pa
5 TR2 5 CN-81 0.8L 4 5 1

87a 87
4D

30

87a 87
3 AC 24V 3 5C 0.8G

30
0.8LOr 136 FUSE BOX 2
ILLUMINATION

85

M
2

86
6 FNR_NEUTRAL 6 4 REVERSE FAN SIG 4 FUEL HEATER 0.8B 4E 0.8L
0.8L 7D G26 3

CN-29
201

87a 87
1

5
2Y

30
7 Hi BEAM_B+ 7 CS-74 34 0.8V

87a

CR-35
5 CONTROLLER B+

87a
5

10
1

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

CS-74
CN-95

CR-7
30

2
86

85
4

87

30
86

85
87
0.8LW 149

4
8 TURN SIG_COM 8 1.2G 193 TRAVEL BZ 5W 57

2
6 AC COMP

2
1
6 2

CN-96
3 2

30A

10A

20A

30A

20A

10A

10A

10A

10A

20A

10A

10A

10A

20A

30A

30A

20A

20A

30A

20A

10A

30A

10A

10A

20A

20A

20A

20A

20A

10A

10A
0.8Gr 46 5

CR-36

87a
5W 191

CN-61
9 HORN 9

CR-5
5

30
3

86

85
87
7 CONDENSOR FAN

B
7

A
1

1
CN-123

5
2

4
3
PARKING

1
2
0.8L 146

CS-74B
G27

1.2Br
0.8Y 9A

ROOM LAMP/CASSETTE
0.8B

0.8WOr
1.2G
1.2Br
10 WASHER

4
10

0.8V
8 ILLUMINATION 8 1 FUSIBLE LINK

2RW
1.2B
2L
2L

MULTI-FUNCTION SW
1
2
5B 0.8G

CR-15
11 WIPER WI

2W
11 2 CR-12 5R 190

177 0.8GrW
174 0.8ROr
175 0.8BOr
165 0.8BOr

CIGAR,SEAT HEAT
166

5
0.8YW

180 0.8BOr

2Br
2

4
3

145 0.8BOr
2

27 0.8BW
OPTION(BEACON)

2Y
G32 2B
AIR CON/HEATER
CS-74

2B
12 Lo BEAM 12 1

44A 0.8Br
REV.

0.8Y
194
193
5R 192 BATTERY

176
194

ENG STOP SOL

SWITCH PANEL
34 0.8V

G41
4 5 1 1

ILLUMINATION

ILLUMINATION
ILLUMINATION
29
29

FUEL HEATER
2W

188
2W
2

TRAVEL SOL.
AC& HEATER
14
55

SAFETY SOL
CONVERTER
WORK LAMP
CABIN LAMP

G31
TURN LAMP
CN-122

SOLENOIDE
SOLENOIDE
HEAD LAMP

6A
0.8V

MCU CONT.
START KEY
CN-98 34A CN-60

1.2Or

185
CASSETTE

0.8BOr
G28 0.8B 3 60R 60B

CLUSTER
0.8V 41

6B
1

0.8L
1.2L
1 HEAD LAMP_COM 1 35 1.2LW

SPARE
SPARE

WIPER
184 1.2V

WIPER
4

14A
211

HORN
0.8BrW 167

MCU
2

CN-36
2 HEAD LAMP Hi BEAM 2 36 1.2G 3 2
0.8W 45 DO-7 FWD. 5
0.8V 62A MASTER SW

186
150
3 WIPER Lo SPEED 3 CR-1

7A
1 TRAVEL SPEED 12V X 2

7
0.8W 45A 0.8ROr 26B CR-30
4 WIPER Hi 4 2 G11 1.2B
0.8Br 148 87a 30 86
5 WIPER INT 5 CN-22 00 0.8B CN-70 37B 1.2G TO:STARTER "B" TERM.

26 0.8ROr

31 0.8ROr

32 1.2ROr
36

23 0.8VOr

10 0.8YOr
1.2G

17 0.8RW

20 1.2RW

1.2RW
30 1.2VW
13 1.2R
85

12 0.8Y
0.8GrW 131 2

19 0.8Or

21 0.8Gr

1.2Or
0.8V 62

33 1.2Br
14 2W
6 PARKING RY

24 2RW
6

16 0.8R

18 0.8R

27 2.0R
201 2Y

22 1.2V

63 1.2V

28 1.2V

0.8Y
5A 1.2G

1.2L

0.8L
1 G22 0.8 B

25 2R
87

2Y

29 2L
0.8W 130 0.8ROr 26A 1
7 WORKING SIG 7 M
2 4C 0.8L BATT RY
0.8Gr 137 86
8 TRAVEL SIG 8 4B 0.8L 87a 87 85
WASHER P/P 30 HIGH SPEED SOL.(M2)

3
8

9
0.8BW 134
9 RAMLOCK_ON 9 DO-3
0.8VW 129 REV.RY DO-4 37A 1.2G
10 FUSE 10 36A 1.2G 2
2 G12 1.2B
CR-29 G23 0.8 B 1
CN-99 87a
1
0.8L 135 30 86
1 CRUISE SIG 1 00 0.8B DIODE
0.8YOr 10A 85
2 HAZARD SW_LAMP 2 184 1.2V
0.8YOr 50 87 CN-181
3 TURN_RH 3 4A 0.8L 35 1.2LW
0.8YW 51 86 2
4 TURN_LH 4 4 0.8L 87a 87 85
G24 0.8 B
1.2B G52 30 1
5 GND 5
0.8L 91 FWD.RY
6 WORKING BRAKE LP 6 LOW SPEED SOL.(M1)
7 RAMLOCK LAMP 7 DO-5
0.8LOr 8B 35A 1.2LW
8 LAMP 24V 8 2
G25 0.8 B
9 NC 9 DOZER ACT. PS 1
10 NC 10 15A 0.8B DIODE
NC
2 Pa
11 11 147 0.8WOr
1
12 NC 12
0.8B G53 CD-50
13 HAZARD SW_LAMP 13
0.8B 61
14 GND 14
0.8B 61A
15 GND 15
0.8BrW 133
16 PARKING SIG 16
CN-2
MULTI-FUNCTION SW 46 0.8Y
1 ENG. OIL PS
2 NC
60 0.8V
3 AIR-CON COMP
CN-5 81 00 0.8
0.8Y P3 SIG.
1 CLUSTER_TX 1 4
0.8L 76 86E 0.8
2 CLUSTER_RX 2 5 FUEL CUT-OFF SOL_HOLD
0.8B 140 00 0.8
3 SHIELD 3 6 P1 SIG.
00 0.8
4 CLUSTER_GND 4 7 P2 SIG.
0.8Gr 21 64 2W
5 CLUSTER_IG 5 8 FUEL CUT-OFF SOL_PULL
56 Or
6 CLUSTER_BATT.24V 6 9 EPPR V/V
75 Br
7 CAMERA 12V 7 10 EPPR V/V
8 Y
8 SHIELD 8 11 TACHO SENSOR
0.8BW 60 9 L
9 P_DUMP 9 12 TACHO SENSOR
0.8Br 143 00 0.8
10 QUICK COUPLER SW_NO 10 13 SENSOR SUPPLY
68 2B
11 OVERLOAD PS 11 14 FUEL CUT-OFF SOL_GND
00 0.8
12 OVERLOAD SIG_MCU 12 15 SENSOR RETURN
0.8YOr 10
13 ILLUMINATION 13
0.8W 73
14 HOUR METER SIG. 14
0.8G 82 ENGINE HARNESS
15 RS232_RX 15
0.8R 77
16 RS232_TX 16 CN-3
0.8B 61B 68A 0.8B
17 GND 17 1 GND
0.8R 16 64E 0.8
18 WIPER CONT_BATT.24V 18 2 START RY
0.8V 62 66 0.8W
19 WIPER CONT_WASHER P/P DRIVE 19 3 ALT_L
67 0.8Y
20 CAN_Hi 20 4 PRE-HEAT RY
81A 0.8
21 CAN_Lo 21 5 SENSOR RETURN
43 0.8
22 Shield 22 6 WATER TEMP SENSOR
0.8W 45
23 WIPER DRIVE SIG 23 7 ILLUMINATION LAMP
0.8ROr 26
24 WIPER IG 24 8 NC
1.2ROr 32
25 CIGARLIGHTER 25 9 CAMERA 24V
26 GND 26 10 CAMERA SIG
1.2B 15
27 GND 27 11 CAMERA GND
1.2V 63
28 DC-DC CONVERTER_IG 28 12 CAMERA SHIELD
1.2Or 8
29 SW_COM(IG) 29
1.2B G62
30 GND 30
1.2B G63
31 GND 31
0.8R 18
32 FLASHER UNIT B+ 32
1.2Br 33
33 BEACON SW_COM(IG) 33
1.2V 54 54 2V
34 CABIN LIGHT 34
0.8BOr 145
35 START KEY SW_START 35
2W 211
36 START KEY SW_COM 36
0.8L 146
37 WASHER SIG 37
1.2V 54
38 CABIN LIGHT 38 CL-4
0.8WOr 147 48 1.2R
39 DOZER PS 39 1 Lo
49 1.2Or
40 BREAKER 40 2 Hi
G8 1.2B
41 RS232 RX2(GPS) 41 3 E
42 RS232 TX2(GPS) 42 HEAD LAMP RH
0.8Br 148
43 INT_WIPER 43 CN-214 0.8B 0.8B
CN-220
0.8LW 149 G91 G94 CL-3
44 FLASHER UNIT_L 44 1 1 48 1.2R
0.8BOr 150 0.8Gr 208 205 0.8L 1 Lo
45 ILLUMINATION_SW PANEL 45 2 2 49 1.2Or
0.8Y 12 2 Hi
46 CASSETTE RADIO_BATT.24V 46 FRONT RH REAR LH G1 2B
0.8VOr 23 3 E
47 CASSETTE RADIO_IG 47
HEAD LAMP LH
48 FUEL HEATER SW 48
0.8BrW 151
49 SWITCH PANEL_HEAD LAMP 49 CN-151
0.8VW 152 156 0.8GrW
50 SWITCH PANEL_WORK LAMP 50 1 CABIN LAMP RY(COIL)
54A 2.0V
51 NC 51 2 CABIN LAMP RY
25 2.0R
52 CAN2_LO 52 3 CABIN LAMP RY
0.8Br 154 152 0.8VW
53 PRE-HEAT 53 4 WORK LAMP RY(COIL)

HARNESS RY
0.8G 155 183 2.0RG
54 SW PANEL_FRONT D/O 54 5 WORK LAMP RY
0.8GrW 156 24 2.0RW
55 SWITCH PANEL_CABIN LAMP 55 6 WORK LAMP RY
0.8BW 157 G4 1.2B
56 SW PANEL_REAR D/O 56 7 RELAY EARTH
1.2V 22 49A 1.2Or
57 SWITCH PANEL_IG 57 8 HEAD LMP RY HI
167 0.8BrW
58 ECONO SW 58 9 HEAD LMP RY HI(COIL)
0.8WOr 55 48A 1.2R
59 START SW_ACC 59 10 HEAD LMP RY LO
0.8Or 158
60 START SW_BR 60 11 NC
8C 1.2Or
12 FUSE
CN-7
1 JOYSTICK_SUPPLY 1 CN-152
92 0.8V
1 FUEL HEAT RY(COIL)
2 JOYSTICK_GND 2 185 2.0Br
2 FUEL HEAT RY
3 JOYSTICK_TILT SIGNAL 3 166 0.8YW
0.8ROr 32A 3 HEAD LMP RY LO(COIL)
4 NC 4 41 0.8V
0.8Or 8D 4 HEAD LMP RY
5 BREAKER SW 5 205 0.8L
0.8BW 159 5 REAR LH RY
6 BREAKER SW 6 206 0.8Y
0.8B G71 6 REAR RH RY

HARNESS RY
7 HORN 7 207 0.8BrW
0.8Gr 46 7 FRONT LH RY
8 HORN 8 6 2.0Y
8 FUEL HEAT RY
9 BUTTON 2 9 208 0.8Gr
9 FRONT RH RY
10 BUTTON 2 10 157 0.8BW
11 BUTTON 1 33 10 REAR LH RY(COIL)
11
12 BUTTON 1 11 REAR RH RY(COIL)
12 155 0.8G
13 AIR COMP SW 12 FRONT LH RY(COIL)
13
0.8GrW 160 13 FRONT RH RY(COIL)
14 ACCEL DIAL SUPPLY 14 7B 2L
0.8W 161 14 HEAD LAMP RY
15 ACCEL DIAL SIGNAL 15 151 0.8BrW
0.8B 162 15 HEAD LAMP POWER RY
16 ACCEL DIAL GND 16

CN-8 CN-12 CL-5

G2 2B 2B 2 1A 1.2R
1 NC 1 2 1
1.2Or 8C 183 2RG 2R 1 2A 1.2B
2 CRAB SW 24V 2 1 2
0.8B 2A
3 CRAB SW COM 3 WORK LAMP
4 NC
1B 1.2R
4 1
1.2B G72 2B 1.2B
5 GND 5 2
6 CRAB SW SIG 6
0.8W 203 CR-2 CL-6
28 1.2V
30
7 ACCEL DIAL LED 7 28C 0.8V 87a 87 85
0.8ROr 26C 86
8 SPARE SW 8 47A 1.2G
87
9 BRAKE FAIL LAMP 9 46A 1.2Gr CN-25
85 G3 1.2B
10 NC 10 1
30 86
11 TM OIL LAMP
87a 47 1.2G
11 2
12 AIR COMP SW 12
HORN
HORN
G5 1.2B
RH CONSOL 1
47 1.2G
CN-4 2
1 JOYSTICK_SUPPLY 1 CN-20
2 JOYSTICK_GND 2
CR-62
3 JOYSTICK_ROTATE SIGNAL 3 G30 0.8Br
1
4 EM'CY STOP SW 4 40 0.8BW 4 5 1
0.8Y 132 2
5 POWER MAX SW 5 18 0.8Or
0.8B 66 3
6 POWER MAX SW 6 4
0.8GrW 139
7 ONE TOUCH DECEL 7 136 0.8Br 3 2
1.2B 66A 5
8 ONE TOUCH DECEL 8
BREAKER
9 BUTTON 2 9
10 BUTTON 2 10
11 BUTTON 1 11

0.8Br
0.8B
12 BUTTON 1 12
13 EM'CY STOP SW 13
1.2B G73

CN-66
14 SAFETY SW COM 14

1
2
15 SAFETY SW NC 15
1.2G 196
16 SAFETY SW NO 16
LH CONSOL BREAKER SOL.

CN-68
1.2G 196
1
56A

1.2VW 67
3D

2
SAFETY SOL
0.8RW

CN-140
0.8V

1
1.2B G74 CR-47
30 1.2VW
0.8Br 143 30
2 30A 0.8VW 87a 87 85
86
DO-6

QUICK COUPLER
2
1

87
197 0.8BOr
85
67 1.2VW 30 86
56A

CL-16 87a
56

3D

0.8Y 9 DIODE
3C

TA 1 SAFETY SOL RY
NC 2
0.8YOr 50
0.8RW
1.2RW

TU 3
0.8V
0.8V

0.8B G75
EH 4
0.8G 5
BU 5
0.8Gr 52
DO-6
CN-69

ST 6
1
2
1
2

REAR COMBI RH
CL-25 CL-21
0.8YOr 10B 21 0.8Y
C 1 2 DIODE
0.8B G76 16A 0.8B RAMLOCK
E 2 1
0.8YOr 50A
T 3 NUMBERPLATE
FRONT COMBI RH LAMP

CL-15
168

0.8 YOr 10C

1A

TA 1
94
2

NC 2
0.8YW 51
0.8ROr
0.8ROr

TU 3
0.8Br

0.8Y

0.8B G77
0.8

EH 4
0.8G 5
141
124

140

127

123

121
CN-131

BU
46

5
32
33

36

37
38
21
39
40
41

42

44

27
28
45

47
48
49
50
51

22

53
54

56

58

59

60
24
61

63
64

65

66

57
62
25

67
68
69
70
71
72
73
0.8Gr 52
3
1

4
5
6
2

ST 6
81H
80A
81J
81H
80A

GrW

OrW

GrW

WOr
91

GOr

GOr
80
90

ROr
42A

YOr

BOr
GW

GW
RW

LOr

LOr

LOr
VW

VW

BW
91

LW

OR
GY

REAR COMBI LH

BR
Gr

Gr
Br

Br

Br
W
W

W
W

G
R
Y

B
Y

B
L

L
37A
3 1.2ROr

4 1.2ROr

CL-24
63
54

36
5 1.2Y
2 1.2Br
1 1.2B

CN-51

CN-50

0.8Y 9
0.8OrW

0.8ROr
0.8ROr

0.8BW
0.8LW
0.8BW
0.8ROr

C 1
0.8BW

G44
0.8LW

10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36

10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
0.8Gr

G43
1
2
3
4
5
6
7
8
9

1
2
3
4
5
6
7
8
9

G37
B G2

22A
51

127

3F
56
50
44

3H
54
E 2

22
47
W
G
V

0.8YW 51
T 3
CD-7
CD-31

LOr
CN-76

ROr
CD-6

VW
WATER TEMP SENDOR
GND(PRES.SENSOR)

B
L
TRAVEL SPEED SOL

LOr
FRONT COMBI LH
HYD TEMP SENDOR

LW
24V(PRES.SENSOR)

B
C
A
B

TRAVEL ALARM SW
C

FUEL LEVEL SENSOR

GW
A
B

BOOM PRIORITY SOL

Or
TACHO SENSOR(+)
6
5
4
3
2
1

B
C
A
B

TACHO SENSOR(-)

ANTI-RESTART RY

B
WATER LEVEL SW

Or
PUMP PROLIX SW

BRAKE FAIL LAMP

ENG.OIL FILTER SW
AIR CLEANER SW

ENG PREHEATER
POWER MAX SOL
TRAVEL Hi/Lo SW

PROGRAM DUMP

TRAVEL BUZZER
POWER MAX SW

GND (POT&DIAL)

BATTERY 24V(+)
RETURN

ACCEL DIAL SIG

RETURN

CD-5
HEAVY LIFT SW

MAX FLOW SOL

OVERLOAD SIG
SUPPLY

CR-63
BRAKE FAIL PS

GND (SENSOR)
SUPPLY
RETURN

CD-3

CN-88
CD-1
P1 PRESS SIG.
P2 PRESS SIG.
P3 PRESS SIG.

O/T DECEL SW

TRAVEL MODE

ENG STOP SIG

PUMP EPPR(+)
5V (POT&DIAL)
SUPPLY

PRE-HEAT SW

CD-2
PUMP EPPR(-)

ACCEL ACT(+)

CN-133
HOUR-METER

HOUR-METER

CD-10
T/M OIL LAMP

ACCEL ACT(-)
SIG

WORKING PS

0.8Y 168
WORK MODE

PARKING SW

1
BOOM UP PS

2
M+

2
P+

RS232 (GND)
NC
M-

1
2
P-

1
2
WORKING BRAKE

1
2
ENG OIL PS

GND (MAIN)
1

Pa
TRAVEL PS

1
2
CD-4
CD-38

SERIAL-RX
ALT LEVEL

T/M OIL PS
SIG

SERIAL-TX
POWER IG
SIG

RS232_RX
RS232_TX
2B G79
SIG

1 5 4
STOP LAMP
C

C
B
A

B
A

1
5

POT-SIG

C
2

Pa
M

28B

Pa
0.8V
DOZER WORK
RETURN

RETURN

3 TRAVEL

GND
SUPPLY

SUPPLY

AIR
NC

NC

NC

NC

NC
NC
NC
NC

NC

NC
6

4 CLEANER SW HYD TEMP

SIG+
SIG

0.8Gr 52A ACCEL ACTUATOR T/M PS FUEL BOOM POWER

2 3
5 BRAKE PS
MCU SENDOR PRIORITY MAX
STOP LAMP

140W9S4EC04

4-6
·ELECTRICAL
ELECTRICAL CIRCUIT(2/3,
CIRCUIT CLUSTER TYPE 2
2)
Service Tool

RS232 P_DUMP
RS232_RX
RS232_TX
CAN2_Lo

CAN1_Lo
CAN2_Hi

CAN1_Hi
CN-113

IG 24V
00 RELAY

GND
0.8B
1 INTAKE M/ACT TEMP M/ACT MODE(D/FOOT) MODE(VENT) BLOWER
00 0.8Or
2
2 7 2 7
1
M 4
M 1
M 4 BLOWER
BUZZER 3 M 3

3
7

1
7

G
H

B
E

A
F
J
DC/DC CONVERTER 5 5

M
CIGARLIGHT

4
2
SPARE CS-67

5
6
7
5
6
7

5
6
7
1
2
3
4
5
6
7

1
2
3
4

1
2
3
4
1
2
3
4
12V SOCKET HOUR METER

24V

12
0.8BW
1

12

10
3

4
9

1
2
1

4
2
3
0.8G

0.8G

12V
0.8R
0.8V
0.8B
2 12

0.8
0.8
0.8
2

h
3

9
8
7
6
5
4
3
2
1

B GND
12V
24V
10 0.8Br

CN-48
CN-126

CL-2
4

CN-139

CN-138

3
2
1
10
9
8
7
6
5
4

11
3
2
1
5

2
1
2

8
C
A

CS-50
HARNESS-AIRCON

10
6

11
12
CN-21

0.8YOr
1.2ROr

9
4

8
1
2
3

6
7
3

0.8RW

1.2B
7

0.8W
7

0.8BW

0.8B
3 1
WIPER CUT 26 9

0.8G
0.8G
0.8G
0.8G

0.8G
1.2Or

1.2Or
0.8R
0.8V
0.8B
0.8R 10

84N 1.2B

1.2Or
8

1.2V
84M 1.2B

0.8VOr
2
4

0.8Or

0.8Or
28A 1.2Br
0.8GY 12 NO. DESTINATION

0.8V

0.8B
13A

84K
CN-11

24A
9 8

84L
5 3

5A
10

14
CS-53

82A
0.8R 4a 1 1 GND

75
10

15
20
20
20
20

16
19
4

75
25
9
4 10A 0.8Br

84J
0.8G 8 11 2 2 BLOWER SIG

0.8B

77
12

11

77
5 84H 0.8B 11 12
0.8L 9 12 3 3 FUSE(IG)
6 M 2 6

0.8Or

2A
QUICK COUPLING SW 4 4 REVERSE FAN
5 5 FUSE(Battery)
WIPER MOTOR CS-52 6 6 DPS(COMPRESSOR)

11
1 7 7 CONDENSOR FAN
2 12
2 8 8 ILLUMINATION
42 0.8BW
CN-141 3
0.8G 8 78 0.8G
FEED BACK 1 CN-157 4
0.8W 1
MOTOR DRIVE SIG 2 CN-17 ANTENA 5
0.8L 9
MOTOR DRIVE- 3 1 6
0.8R 1 0.8W 0.8W 22 52 0.8LOr 3
4 10 2 7 7
MOTOR DRIVE+
0.8B 2 2 0.8B 1.2B 84P 28B 1.2Br 9
GND 5 3 8
0.8GY/W 3 3 0.8GY/W 0.8ROr 23 4
VCC 6 4 9 8
0.8R 4 4 0.8R 0.8R 17 10
CONTINUE 24V 7 5 10
0.8V 5 5 0.8V 0.8V 18 78 0.8G
WASHER P/P 8 6 11
0.8L 6 6 0.8L 0.8L 32 84G 0.8B 11 12
WASHER SIG. 9 7 12
0.8BR 7 7 0.8BR 0.8Br 37
INT. SIG 10 8 FUEL HEATER
0.8Or 11
WIPER CUT SW 11

10
11
12
13
14
15
16
17
18

10
11
12
13
14
1
2
3
4
5
6
7
8
9

1
2
3
4
5
6
7
8
9
32
22
N.C 12
0.8GY 12
FEED BACK 13

0.8W
0.8L

0
0

0
0
TEMP MOTOR ACT(+)

DUCT SENSOR(GND)
TEMP MOTOR ACT(-)

DPS(COMPRESSOR)

1
2
MODE M/ACT(FOOT)

BLOWER RELAY(Lo)
INLET MOTOR(REC)
WIPER MOTOR CONT.

INLET MOTOR(FRE)
CN-56

MODE M/ACT(PBR)
MODE M/ACT(DEF)

AMBIENT SENSOR
TEMP M/ACT(PBR)

CONDENSOR FAN
MOTOR ACT(REF)

DUCT SENSOR(+)

W/TEMP SENSOR
MODE M/ACT(M+)
17

POWER TR BASE
BR

MODE M/ACT(M-)

FET(FEED BACK)
RR

DO-16

INCAR SENSOR
1 POWER IG(24V) > > >

REVERSE FAN
ILLUMINATION
ILLUMINATION