Planetary Axle Wheel Ends Coverless

Planetary Spider Design

Extrémités - Ponts a Réduction Planétaire
Porte Satellites Sans-Couvercle
Maintenance Manual MM9G Issued 05-06
Manuel de maintenance MM9G Edité 05-06
Service Notes

Before You Begin You must follow your company procedures when
you service or repair equipment or components.
This manual provides maintenance and service You must understand all procedures and
procedures for AxleTech coverless planetary spider instructions before you begin to work on a unit.
design wheel end assemblies. Before you begin Some procedures require the use of special tools
procedures: for safe and correct service. Failure to use special
1. Read and understand all instructions and tools when required can cause serious personal
procedures before you begin to service injury to service personnel, as well as damage
components. equipment and components.

2. Read and observe all Caution and Warning The instructions contained in this Field
safety alerts that precede instructions or Maintenance Manual are intended for use by
procedures you will perform. These alerts help skilled and experienced mechanics
to avoid damage to components, serious knowledgeable in the installation, repair and
personal injury, or both. replacement of the AxleTech product described
3. Follow your company’s maintenance and herein. Installation, maintenance and replacement
service, installation, and diagnostics guidelines. (including the use of inferior or substandard
components) are grave and can result in product
4. Use special tools when required to help avoid failure and resulting loss of control of the vehicle,
serious personal injury and damage to possible injury to or death of persons and/or
components. possible future or additional axle damage.
AxleTech does not authorize anyone other than
Safety Alerts, Torque Symbol highly skilled and experienced individuals to
attempt to utilize the instructions contained in this
and Notes Manual for the installation, maintenance or
replacement of the product described herein, and
AxleTech shall have no liability of any kind for
! WARNING A Warning alerts you to an damages arising out of (or in connection with)
instruction or procedure any other use of the information contained in this
that you must follow Manual.
exactly to avoid serious
personal injury and AxleTech International uses the following
damage to components. notations to warn the user of possible safety
problems and to provide information that will
! CAUTION A Caution alerts you to an prevent damage to equipment and components.
instruction or procedure
that you must follow How to Order
exactly to avoid damage
to components and Order items from AxleTech International.
possible serious personal Phone orders are also accepted by calling
injury can also occur. AxleTech International’s Customer Service Center
at 877-547-3907 or send a fax to 866-847-3987.
T The torque symbol alerts
you to tighten fasteners to
a specified torque value.

NOTE: A Note provides

information or
suggestions that help you
correctly service a
component.
 Table of Contents
Wheel End with Outer Bearing on Spindle Journal
(PRC 1756 W3H shown as example)
! Asbestos and Non-Asbestos Fibers Warnings .......................................................................iii

Section 1: Exploded View

Coverless Planetary Wheel-End ...................................................................................................................1
Wheel-End with Outer Bearing on Spindle Journal (PRC 1756 W3H) ......................................................2
Drum Brake and Disc Brake Assemblies ....................................................................................................3

Section 2: Introduction
Description .....................................................................................................................................................4
Identification

Section 3: Disassembly
Remove and Disassemble the Planetary Wheel Ends................................................................................6
Remove the Tires and Rims
Remove the Planetary Spider Assembly ....................................................................................................7
Disassemble the Planetary Spider Assembly ............................................................................................8
Remove the Ring Gear and Axle Shaft
Prepare to Remove the Wheel Hub..............................................................................................................9
Prepare to Remove the Ring Gear Hub and Wheel Hub
Remove the Ring Gear Hub and Wheel Hub ............................................................................................10
Remove the Hub Oil Seal and Bearings ....................................................................................................11
Remove the Brake Drum or Disc Brake Rotor
Remove the Brake Shoes
Remove the Spindle

Section 4: Prepare Parts for Assembly

Clean Ground or Polished Parts ................................................................................................................14
Clean Parts With Rough Finishes
Clean Axle Assemblies
Dry Cleaned Parts
Prevent Corrosion
Inspect Parts
Inspect Tapered Roller Bearings ................................................................................................................15
Inspect Planetary Wheel End Components ..............................................................................................16
Repair or Replace Parts
Repair Welding
Remove Capscrews Fastened with Liquid Adhesive
Cleaning ......................................................................................................................................................17
Using Dri-Loc Fasteners and Meritor Liquid Adhesive
Reusing Dri-Loc Fasteners and Loctite® No. 277
Applying Silicone Gasket Material ............................................................................................................18
Flush Lube From the Axle

Page i
Table of Contents

Section 5: Assembly
Install the Spindle ......................................................................................................................................20
Install the Axle Shaft in Rigid Axle Models ..............................................................................................24
Assemble the Ring Gear Hub Assembly
Assemble the Hub, Bearings, Oil Seal and Drum or Rotor
Install the Wheel Hub ..................................................................................................................................25
Adjust the Wheel Bearing Preload ............................................................................................................26
Install the Planetary Ring Gear and Sun Gear
Assemble the Planetary Spider
Install the Planetary Spider Assembly ......................................................................................................28
Adjust the Brakes ........................................................................................................................................30
Install the Tires and Rims
Fill the Wheel Ends With Lubricant
Measure and Adjust the Toe Setting ........................................................................................................31
Tire Matching for Tandem and Tridem Axles

Section 6: Lubrication
Lubrication Schedule ..................................................................................................................................33
Lubricant Specifications

Section 7: Specifications
Rigid Axle Wet Disc Brake ..........................................................................................................................34
Rigid Axle Drum Brake
Rigid Axle Dry Disc Brake ..........................................................................................................................35
Steering Axle Dry Disc Brake
PRC 1756 W3H ............................................................................................................................................36
Planetary Axle Wheel End Torque Specifications ....................................................................................37

Page ii
 Asbestos and Non-Asbestos Fibers

! ASBESTOS FIBERS WARNING ! NON-ASBESTOS FIBERS WARNING

The following procedures for servicing brakes are recommended to reduce The following procedures for servicing brakes are recommended to reduce
exposure to asbestos fiber dust, a cancer and lung disease hazard. Material exposure to non-asbestos fiber dust, a potential cancer and lung disease
Safety Data Sheets are available from Axletech. hazard. Material Safety Data Sheets are available from Axletech.
Hazard Summary Hazard Summary
Because some brake linings contain asbestos, workers who service brakes must Most recently manufactured brake linings do not contain asbestos fibers. These brake
understand the potential hazards of asbestos and precautions for reducing risks. Exposure linings may contain one or more of a variety of ingredients, including glass fibers, mineral
to airborne asbestos dust can cause serious and possibly fatal diseases, including wool, aramid fibers, ceramic fibers and silica that can present health risks if inhaled.
asbestosis (a chronic lung disease) and cancer, principally lung cancer and mesothelioma Scientists disagree on the extent of the risks from exposure to these substances.
(a cancer of the lining of the chest or abdominal cavities). Some studies show that the risk Nonetheless, exposure to silica dust can cause silicosis, a non-cancerous lung disease.
of lung cancer among persons who smoke and who are exposed to asbestos is much Silicosis gradually reduces lung capacity and efficiency and can result in serious
greater than the risk for non-smokers. Symptoms of these diseases may not become breathing difficulty. Some scientists believe other types of non-asbestos fibers, when
apparent for 15, 20 or more years after the first exposure to asbestos. inhaled, can cause similar diseases of the lung. In addition, silica dust and ceramic fiber
Accordingly, workers must use caution to avoid creating and breathing dust when dust are known to the State of California to cause lung cancer. U.S. and international
servicing brakes. Specific recommended work practices for reducing exposure to agencies have also determined that dust from mineral wool, ceramic fibers and silica are
asbestos dust follow. Consult your employer for more details. potential causes of cancer.
Accordingly, workers must use caution to avoid creating and breathing dust when
Recommended Work Practices servicing brakes. Specific recommended work practices for reducing exposure to non-
1. Separate Work Areas. Whenever feasible, service brakes in a separate area away asbestos dust follow. Consult your employer for more details.
from other operations to reduce risks to unprotected persons. OSHA has set a maximum
allowable level of exposure for asbestos of 0.1 f/cc as an 8-hour time-weighted average Recommended Work Practices
and 1.0 f/cc averaged over a 30-minute period. Scientists disagree, however, to what 1. Separate Work Areas. Whenever feasible, service brakes in a separate area away
extent adherence to the maximum allowable exposure levels will eliminate the risk of from other operations to reduce risks to unprotected persons.
disease that can result from inhaling asbestos dust. OSHA requires that the following sign
be posted at the entrance to areas where exposures exceed either of the maximum 2. Respiratory Protection. OSHA has set a maximum allowable level of exposure for
allowable levels: silica of 0.1 mg/m3 as an 8-hour time-weighted average. Some manufacturers of non-
asbestos brake linings recommend that exposures to other ingredients found in non-
DANGER: ASBESTOS asbestos brake linings be kept below 1.0 f/cc as an 8-hour time-weighted average.
CANCER AND LUNG DISEASE HAZARD Scientists disagree, however, to what extent adherence to these maximum allowable
AUTHORIZED PERSONNEL ONLY exposure levels will eliminate the risk of disease that can result from inhaling non-
RESPIRATORS AND PROTECTIVE CLOTHING asbestos dust.
ARE REQUIRED IN THIS AREA
Therefore, wear respiratory protection at all times during brake servicing, beginning with
2. Respiratory Protection. Wear a respirator equipped with a high-efficiency (HEPA) filter the removal of the wheels. Wear a respirator equipped with a high-efficiency (HEPA)
approved by NIOSH or MSHA for use with asbestos at all times when servicing brakes, filter approved by NIOSH or MSHA, if the exposures levels may exceed OSHA or
beginning with the removal of the wheels. manufacturer’s recommended maximum levels. Even when exposures are expected to
3. Procedures for Servicing Brakes. be within the maximum allowable levels, wearing such a respirator at all times during
a. Enclose the brake assembly within a negative pressure enclosure. The enclosure brake servicing will help minimize exposure.
should be equipped with a HEPA vacuum and worker arm sleeves. With the enclosure 3. Procedures for Servicing Brakes.
in place, use the HEPA vacuum to loosen and vacuum residue from the brake parts. a. Enclose the brake assembly within a negative pressure enclosure. The enclosure
b. As an alternative procedure, use a catch basin with water and a biodegradable, non- should be equipped with a HEPA vacuum and worker arm sleeves. With the enclosure
phosphate, water-based detergent to wash the brake drum or rotor and other brake in place, use the HEPA vacuum to loosen and vacuum residue from the brake parts.
parts. The solution should be applied with low pressure to prevent dust from becoming b. As an alternative procedure, use a catch basin with water and a biodegradable, non-
airborne. Allow the solution to flow between the brake drum and the brake support or phosphate, water-based detergent to wash the brake drum or rotor and other brake
the brake rotor and caliper. The wheel hub and brake assembly components should be parts. The solution should be applied with low pressure to prevent dust from becoming
thoroughly wetted to suppress dust before the brake shoes or brake pads are removed. airborne. Allow the solution to flow between the brake drum and the brake support or
Wipe the brake parts clean with a cloth. the brake rotor and caliper. The wheel hub and brake assembly components should be
c. If an enclosed vacuum system or brake washing equipment is not available, employers thoroughly wetted to suppress dust before the brake shoes or brake pads are
may adopt their own written procedures for servicing brakes, provided that the removed. Wipe the brake parts clean with a cloth.
exposure levels associated with the employer’s procedures do not exceed the levels c. If an enclosed vacuum system or brake washing equipment is not available, carefully
associated with the enclosed vacuum system or brake washing equipment. Consult clean the brake parts in the open air. Wet the parts with a solution applied with a
OSHA regulations for more details. pump-spray bottle that creates a fine mist. Use a solution containing water, and, if
d. Wear a respirator equipped with a HEPA filter approved by NIOSH or MSHA for use available, a biodegradable, non-phosphate, water-based detergent. The wheel hub
with asbestos when grinding or machining brake linings. In addition, do such work in an and brake assembly components should be thoroughly wetted to suppress dust before
area with a local exhaust ventilation system equipped with a HEPA filter. the brake shoes or brake pads are removed. Wipe the brake parts clean with a cloth.
e. NEVER use compressed air by itself, dry brushing, or a vacuum not equipped with a d. Wear a respirator equipped with a HEPA filter approved by NIOSH or MSHA when
HEPA filter when cleaning brake parts or assemblies. NEVER use carcinogenic grinding or machining brake linings. In addition, do such work in an area with a local
solvents, flammable solvents, or solvents that can damage brake components as exhaust ventilation system equipped with a HEPA filter.
wetting agents. e. NEVER use compressed air by itself, dry brushing, or a vacuum not equipped with a HEPA
4. Cleaning Work Areas. Clean work areas with a vacuum equipped with a HEPA filter or filter when cleaning brake parts or assemblies. NEVER use carcinogenic solvents,
by wet wiping. NEVER use compressed air or dry sweeping to clean work areas. When you flammable solvents, or solvents that can damage brake components as wetting agents.
empty vacuum cleaners and handle used rags, wear a respirator equipped with a HEPA 4. Cleaning Work Areas. Clean work areas with a vacuum equipped with a HEPA filter or
filter approved by NIOSH or MSHA for use with asbestos. When you replace a HEPA filter, by wet wiping. NEVER use compressed air or dry sweeping to clean work areas. When you
wet the filter with a fine mist of water and dispose of the used filter with care. empty vacuum cleaners and handle used rags, wear a respirator equipped with a HEPA
5. Worker Clean-Up. After servicing brakes, wash your hands before you eat, drink or filter approved by NIOSH or MSHA, to minimize exposure. When you replace a HEPA filter,
smoke. Shower after work. Do not wear work clothes home. Use a vacuum equipped with wet the filter with a fine mist of water and dispose of the used filter with care.
a HEPA filter to vacuum work clothes after they are worn. Launder them separately. Do not 5. Worker Clean-Up. After servicing brakes, wash your hands before you eat, drink or
shake or use compressed air to remove dust from work clothes. smoke. Shower after work. Do not wear work clothes home. Use a vacuum equipped
6. Waste Disposal. Dispose of discarded linings, used rags, cloths and HEPA filters with with a HEPA filter to vacuum work clothes after they are worn. Launder them separately.
care, such as in sealed plastic bags. Consult applicable EPA, state and local regulations on Do not shake or use compressed air to remove dust from work clothes.
waste disposal. 6. Waste Disposal. Dispose of discarded linings, used rags, cloths and HEPA filters with
Regulatory Guidance care, such as in sealed plastic bags. Consult applicable EPA, state and local regulations
on waste disposal.
References to OSHA, NIOSH, MSHA, and EPA, which are regulatory agencies in the United
States, are made to provide further guidance to employers and workers employed within Regulatory Guidance
the United States. Employers and workers employed outside of the United States should
consult the regulations that apply to them for further guidance. References to OSHA, NIOSH, MSHA, and EPA, which are regulatory agencies in the
United States, are made to provide further guidance to employers and workers employed
within the United States. Employers and workers employed outside of the United States
should consult the regulations that apply to them for further guidance.

Page iii
Notes
 Section 1
Exploded View

Coverless Planetary Wheel-End

15

14

13B 13
16A
12
17B 17A 11
10
13A
9

10A

22

19
18

7
6
5 8
23

7
20
4
21
20
6

2 3
1

Item Description Item Description

1 Planetary Spider to Hub Capscrew 13/13A Wheel Bearing Adjusting Nut
2 Planetary Spider to Hub Washer 13B Wheel Bearing Adjusting Nut
3 Shaft Planet Pinion Setscrew 14 Planetary Ring Gear
4 Ring Gear Thrust Button 15 Planetary Ring Gear Hub
5 Planet Pinion Shaft 16A Hub Nut Lock
6 Planet Pinion Outer Thrust Washer 17A Capscrew
7 Planetary Drive Pinion 17B Capscrew
8 Planet Pinion Inner Thrust Washer 18 Axle Shaft Thrust Button
9 Planetary Sun Gear 19 Oil Drain Plug
10 Sun Gear Thrust Washer 20 Needle Roller Bearing
10A Sun Gear Thrust Washer 21 Needle Roller Bearing Spacer
11 Wheel Bearing Adjusting Jam Nut 22 Spider
12 Wheel Bearing Adjusting Washer 23 O-Ring

1
Section 1
Exploded View

Wheel End with Outer

Bearing on Spindle Journal
(PRC 1756 W3H shown as example)

3 4

1 7
8 9
2
12

13 14
5
15
6

10

11
16

34
35
17 36 38
18 19 37
20 39 40
22 41
21
23

24
25 26
27
31
28 29
30 32 33

ITEM DESCRIPTION ITEM DESCRIPTION ITEM DESCRIPTION

1 Axle Shaft 15 Bearing Cone 29 Planetary Pinion Shaft
2 O-Ring 16 Screw 30 Pinion Thrust Washer
3 O-Ring 17 Stud (Hub) 31 O-Ring Seal
4 Spindle 18 Wheel Hub 32 Planetary Gear Spider
5 O-Ring 19 Bearing Cup 33 Expansion Plug
6 Screw 20 Bearing Cone 34 Sun Gear Washer
7 Hexagon Socket Head Cap Screw 21 Planetary Ring Gear Hub 35 Sun Gear
8 Oil Seal Sleeve 22 Sleeve 36 Snap Ring
9 Face Seal 23 Wheel Bearing Nut 37 Thrust Washer
10 Hexagon Socket Head Cap Screw 24 Planeary Ring Gear 38 Thrust Button
11 Hardened Washer 25 O-Ring 39 Magnetic Plug
12 Brake Driver 26 Snap Ring 40 Washer
13 Radial Seal 27 Planet Pin Thrust Washer 41 Cap Screw
14 O-Ring 28 Planetary Gear

See MM-9G for further information on PRC 1756 W3H wheel-end.

2
 Section 1
Exploded View

Drum Brake and Disc Brake Assemblies

13
12
11

10

8
5 9
6
4 7

3 21
19 20
2 18

1 16
17

7 9

6 22
4 23
24
2

15

25
3
14
STEERING
AXLE
SHAFT
RIGID
AXLE
SHAFT

Item Description Item Description

1 Outer Wheel Bearing Cone 14 Oil Drain Plug
2 Outer Wheel Bearing Cup 15 Axle Shaft Snap Ring
3 Wheel Stud Nut 16 Brake Disc
4 Wheel Hub 17 Disc Mounting Nut (If Applicable)
5 Wheel Stud 18 Disc Mounting Washer
6 Inner Wheel Bearing Cup 19 Disc Mounting Capscrew
7 Inner Wheel Bearing Cone 20 Spindle
8 Spacer 21 Caliper Mounting Adapter
9 Hub Inner Bearing Oil Seal 22 Spindle to Housing Nut (If Applicable)
10 Oil Slinger 23 Spindle to Housing Washer
11 Brake Drum 24 Spindle to Housing Capscrew
12 Drum Mounting Washer 25 Axle Shaft
13 Drum Mounting Capscrew

3
Section 2
Introduction

Description Identification
Axletech coverless spider design planetary axles To determine the exact axle model specification,
incorporate a single or double reduction carrier refer to the identification tag located on the axle.
with hypoid gearing mounted in the axle center. Figures 2.1, 2.2 and 2.3.
Final gearing reduction occurs in the wheel hubs
by planetary design spur gears.
Figure 2.1 Axle Identification Tag Location
Axletech planetary axles permit the carrier hypoid
gearing and axle shafts to carry only nominal
torsional loads. At the same time, the planetary
axles also provide the highest practical numerical
gear reduction at the wheels.
• Power is transmitted by the hypoid gear set in
the carrier to the axle shafts and the sun gear
of the final reduction, through the revolving
planetary gears and into the planetary spider
which drives the wheel hub.
• The floating sun gear teeth mesh with teeth of
the planetary spur gears.
• The planetary gears rotate on planetary shafts
mounted on the spider. The planetary gear
teeth, in turn, mesh with the fixed or floating
ring gear teeth.

Axle Models Covered in This Manual Model No.PRC-1756-W2H-200

.................
Customer No. . . . . . . . . . . . . . .
Rigid Axles
PRC 594 PRC 866 PRLC 755 PRLC 1736 Serial No. . . . . . . . Plant . . . . . .
PRC 671 PRC 867 PRLC 756 PRLC 1756 ..
PRC 673 PRC 1314 PRLC 824 PRLC 1752 Ratio . . . . . . . . . . Date . . . . . . .
PRC 674 PRC 1756 PRLC 874 PRLC 1757
PRC 727 PRLC 616 PRLC 1735 PRLC 1794
PRLS 614

Steering Axles
PSC 594 PSC 1044 PSC 1794
PSC 822 PSC 1485 PSTC 824
PSC 824 PSC 1614
PSC 825 PSC 1615
PSC 826 PSC 1617

Tandem Axles
SPRC 673
SPRC 1356
SPRC 1735
SPRC 1756

Tridem Axles
EPRC 1356
EPRC 1735

4
 Section 2
Introduction

Figure 2.2 Single Planetary Axles

Steering P S C 1 6 1 7 P 100
Example

Rigid P R C 1 7 3 5 W4H 200

Example

Last Digit – Carrier

Designation for
Base Model Number Exact
Specification
First Two Digits Wheel
End Designation
(Basic Model Number)

Housing Type Designation

C = Integral Cast
Brake Type:
DLH — 17 in. (432 mm) Hydraulic Drum – (Dual
Only If Applicable: Leading Hydraulic)
T = Transmission on Carrier
H — Hydraulic Drum
O= Oscillating or Pin Mount
L = Mounting Other Than Pad HDB — Hydraulic Dry Disc
With Drilling M — Mechanical Drum
N — None
R = Rigid
NR — With Rotor Less Calipers
S = Steering
P — “P” Series Cam
P = Planetary RDA — Wedge (Dual Air Chamber)
N = Non-Drive
RDH — Wedge (Dual Hydraulic Cylinders)
RSA — Wedge Single Air Chamber
RSH — Wedge (Single Hydraulic Cylinders)
W2H — Dura-Disc® 9" (224) Wet Disc
W3H — Dura-Disc® 13" (330) Wet Disc or 14.2”
(360) Wet Disc
W4H — Dura-Disc® 17 in. (432 mm) Wet Disc
W4M — Dura-Disc® 17 in. (432 mm) Wet Disc
Spring Applied Hydraulic Release

Figure 2.3 Tandem and Tridem Axles

Exact Specification
S P R C – 1 7 5 6 P 200

Brake Type

S = Tandem P = Planetary R = Rigid Housing Type First Two or Last Digit –

E = Tridem N = No S = Steering Designation Three Digits Carrier
Planetary C = Integral Wheel End Designation for
Gears Cast Designation Base Model
(Basic Model Number
Number)

5
Section 3
Disassembly

Remove and Disassemble the Figure 3.1 FLANGE STYLE HUB

Planetary Wheel Ends

! WARNING
To prevent serious eye injury, always wear safe
eye protection when you perform vehicle
maintenance or service.

1. Park the vehicle on a level surface.

! WARNING
Block the wheels to prevent the vehicle from
moving. Support the vehicle with safety stands.
Do not work under a vehicle that is supported
only by jacks. Jacks can slip or fall over and cause DUAL DEMOUNTABLE HUB
serious personal injury.
2. Block the wheels that will not be raised to
prevent the vehicle from moving.
3. Raise the vehicle, so that the area you will
service is off of the ground. Support the
vehicle with safety stands. Refer to the vehicle
manufacturer’s maintenance manual for
instructions on raising the vehicle.

Remove the Tires and Rims

Planetary axles can come equipped with dual
demountable hubs or flange style hubs.
Figure 3.1. You can service the planetary gearing
on flange style hubs without removing the tire
from the wheel end.
1. For axles with dual demountable hubs: Refer
to the vehicle manufacturer’s removal
instructions.
2. If the axle is equipped with an oil drain plug
in the planetary spider, rotate the hub until
the plug is at the bottom.
3. Remove the drain plug.
4. Drain and discard the lubricant.

6
 Section 3
Disassembly

Remove the Planetary Spider Figure 3.3

Assembly
1. Match mark the spider and wheel hub for
correct alignment when you reassemble the
unit. Figure 3.2.

Figure 3.2 FLANGE STYLE HUB

MATCH MARK BOTH

SPIDER AND HUB

! WARNING
Take care when you use lifting devices. When
you use a lifting strap, inspect the strap for
damage before you use it. Do not use a lifting
strap to shock load or drop load a component.
Serious personal injury and damage to
components can result.
4. Use a lifting device to remove the planetary
DUAL DEMOUNTABLE HUB spider assembly from the wheel hub
assembly. Figure 3.4.
MATCH MARK
SPIDER AND HUB
Figure 3.4

O-RING
(PRC 1756 W3H)

! CAUTION
2. Insert a pry bar into the assembly notches Take care not to damage the O-Ring at the joint
and separate the planetary spider assembly between the spider and hub. (PRC 1756 W3H
from the wheel hub assembly. Figure 3.3. Do only)
not remove the spider assembly at this time.
• For axles without assembly notches: Hit the
spider with a plastic or rubber mallet to
separate the planetary assembly from the
wheel hub assembly. Do not remove the
spider assembly at this time.

7
Section 3
Disassembly

Disassemble the Planetary Spider 6. Press each pinion shaft out of the spider and
planetary gear. Figure 3.6 and Figure 3.7.
Assembly
Figure 3.6 Planetary pinion shaft with
! WARNING INNER OPTION needle roller bearings
THRUST WITH SNAP
Observe all WARNINGS and CAUTIONS provided WASHER RING
by the press manufacturer concerning press
operation to avoid serious personal injury and NEEDLE
ROLLERS
possible damage to components during assembly
and installation procedures. SPACER

NOTE: During disassembly, mark or tag the PLANETARY

planetary spider parts you do not plan to replace. GEAR
Marking and tagging these parts, will aid correct SETSCREW
NEEDLE
installation during assembly. ROLLERS
PINION
1. Remove the setscrew from each pinion shaft. OUTER SHAFT
THRUST
2. In designs with snap ring, remove snap ring. WASHER OPTIONAL
O-RING CAP
Figure 3.5.

Figure 3.5 Figure 3.7 Planetary pinion shaft with

CAPSCREW SUN GEAR OPTION nylon coating
WITH SNAP
RING
SPIDER

INNER THRUST
WASHER
(SMALL BORE)

PLANETARY
GEAR SETSCREW
PINION
OUTER THRUST SHAFT
WASHER
OPTIONAL
O-RING CAP
WHEEL BEARING
ADJUSTING NUT 7. Remove the planetary gears and thrust
washers from the planetary spider.
3. Place the spider assembly in a press with the 8. For planetary pinion shafts with needle roller
flange side DOWN. bearings: Remove the needle roller bearings
• If a press is not available: Use a brass drift and spacer from the bore of the planetary gear.
and mallet to remove the pinion shafts.
4. Support the spider assembly as required. Remove the Ring Gear
5. Place a container of cushioning material
and Axle Shaft
under the press to catch the planetary pinion 1. Remove the floating ring gear. If necessary,
shafts as you press them out of the spider use a lifting device to remove the ring gear.
and planetary pinion gears. Figure 3.8.
2. Remove the snap ring from the end of the
axle shaft.

8
 Section 3
Disassembly

3. Remove the sun gear. Figure 3.8. For PRC 1756 W3H, refer to Maintenance Manual
MM-20195 (360 mm WDB). To order call AxleTech
International’s Customer Service Center at 877-
Figure 3.8 WHEEL BEARING
ADJUSTING NUT 547-3907 or send a fax to 866-547-3987.
THRUST
WASHER Axles With Hydraulic or
Mechanical Brakes
ADJUSTING NUT
LOCK PLATE For hydraulic or mechanical brake removal and
service instructions refer to Maintenance Manual
4S, SCL 2 Series Dry Disc Brake Calipers and
Maintenance Manual 4Y, SCL 35, 46 and 53 Dry
Disc Brake Calipers. To order call AxleTech
International’s Customer Service Center at
877-547-3907 or send a fax to 866-547-3987.
ADJUSTING
NUT LOCK TO FLAT TO CORNER
PLATE OF NUT OF NUT Axles With P Series or RSA Drum Brakes
4. Remove the sun gear thrust washer
assembly. Figure 3.9.
! WARNING
When you work on a spring chamber, carefully
Figure 3.9 follow the service instructions of the chamber
manufacturer. Sudden release of a compressed
spring can cause serious personal injury.
1. If the brake has spring chambers, manually
compress and lock the springs to release the
brakes.
2. Turn the slack adjuster manual adjusting nut
THRUST
WASHER until the brake shoes fully retract and the
drum clears the lining. If Meritor automatic
slack adjusters are used, refer to Meritor
AXLE
SHAFT Maintenance Manual 4B, Automatic Slack
Adjuster for the correct adjustment procedure.
To order call AxleTech International’s
5. Remove the axle shaft. Customer Service Center at 877-547-3907
• To remove the axle shaft from a steering or send a fax to 866-547-3987.
axle: Remove the wheel hub and spindle
before you remove the axle shaft. Prepare to Remove the
Prepare to Remove the Wheel Hub Ring Gear Hub and Wheel Hub
Axles With Dry Disc Brakes Wheel Bearings With Single Adjusting
Nut and Lockplates
Remove the brake caliper and adapter assembly. 1. Remove the capscrews from the adjusting nut
Refer to Maintenance Manuals 4S, SCL 2 Series lock. The adjusting nut features one of the
Dry Disc Brake Calipers and Maintenance Manual following designs.
4Y, SCL 35, 46, 53 Dry Disc Brake Calipers. To
order call AxleTech International’s Customer • A ring that secures all corners of the nut
Service Center at 877-547-3907 or send a fax • One or two “bow ties” that secure one or
to 866-547-3987. two corners of the adjusting nut or the flat
of the nut
Axles With Wet Disc Brakes
2. Remove the wheel bearing adjusting nut lock
Refer to Maintenance Manual 4L, Wet Disc and wheel bearing nut.
Brakes, for instructions on removing and
servicing the wheel hub, brake driver, hub oil
seal, wheel bearings and spindle.
9
Section 3
Disassembly

Wheel Bearings With Figure 3.10

Scalloped Flange Adjusting Nut PULLER
SCREW
NOTE: To aid in capscrew removal, it may be HOLES
necessary to use a torch to apply heat to the
capscrew to loosen it. Follow the torch
manufacturer’s instructions.

1. Remove the locking capscrew located in the

scallop of the nut. Check the capscrew for
wear. Replace a worn or damaged capscrew.
2. Remove the wheel bearing nut. PULLER SCREW HOLES

Wheel Bearings With Double Adjusting 2. Remove the outer wheel bearing from the
Nuts ring gear hub.
Remove the wheel bearing jam nut, washer and NOTE: Some ring gear hub assemblies include a
wheel bearing adjusting nut. hub and ring sleeve insert. You can not service
these components separately.
Remove the Ring Gear Hub 3. Use a chain fall or similar device to lift the
and Wheel Hub hub and drum (or brake driver, if wet brake
axle) slightly to relieve the hub weight and
drum-to-brake shoe drag.
! CAUTION Figure 3.11 and Figure 3.12.
Support the wheel hub, as shown in Figure 3.10,
4. Remove the assembly from the hub spindle.
before you remove the ring gear and the ring
gear hub assembly. Do not remove the ring gear
and the ring gear hub assembly without Figure 3.11
supporting the wheel hub. Serious personal
injury and damage to components can result.
1. Remove the ring gear hub by pulling it
straight out of the wheel hub and off of the
spindle. To avoid dropping and possibly
damaging the outer wheel bearing cone,
ensure that the outer wheel bearing cone
remains in place as you remove the ring gear
hub. Figure 3.10.
• If you cannot remove the ring gear hub by
hand: Install capscrews into the puller
screw holes in the ring gear hub flange.
Tighten each capscrew the same amount Figure 3.12
to separate the ring gear hub assembly
from the spindle and the wheel hub.

10
 Section 3
Disassembly

Remove the Hub Oil Seal 3. Remove the brake drum or rotor from the
wheel hub. If necessary, use a lifting device to
and Bearings remove the brake drum or rotor.
1. Position the wheel hub with the brake end
UPWARD. Remove the Brake Shoes
2. Some axle model designs with dry disc To remove the brake shoes, refer to the correct
brakes provide enough clearance to remove maintenance manual.
the hub oil seal, bearing cone and bearing
cups without removing the rotor. • For P series brakes: Refer to Maintenance
Manual 4, Cam Brakes.
• If you can remove the hub oil seal, bearing
cone and bearing cups from the axle without • For RSA drum brakes: Refer to Maintenance
removing the rotor: Proceed to Step 5. Manual 4P, Off-Highway Heavy-Duty Brakes.
• If you must remove the rotor from the • For SCL 2 series dry disc brakes: Refer to
wheel hub to remove the hub oil seal, Maintenance Manual 4S, SCL 2 Series Dry Disc
bearing cone and bearing cups: Proceed to Brake Calipers.
Step 4.
• For SCL 35, 46 or 53 series dry disc brakes:
3. PRC 1756 W3H axle model design is with 360 Refer to Maintenance Manual 4Y, SCL 35, 46,
mm WDB. The brake driver does not provide 53 Dry Disc Brake Calipers.
enough clearance to remove the hub oil seal,
To order call AxleTech International’s Customer
bearing cone and be cup without removing
Service Center at 877-547-3907 or send a fax to
the brake driver. Remove the brake driver
866-547-3987. For PRC 1756 W3H brake
from the wheel hub to remove the hub oil
disassembly, refer to MM-20195.
seal, bearing cone and bearing cups. Proceed
to Step 4. (Make sure you mark the two pieces
for alignment. Remove the Spindle
4. Remove the rotor (or brake driver, if wet
brake axle)mounting capscrews and washers.
Axles With Dry Disc Brakes
Remove the rotor.
1. Match mark the spindle and housing flange.

! CAUTION 2. Use straps and a lifting device to support the

spindle.
Carefully remove the face seal belt from brake
driver and take care not to damage O-ring 3. Remove the spindle mounting capscrews and
between driver and hub. washers.
5. Remove the hub oil seal with a suitable puller. 4. Remove the spindle from the axle housing or
Do not scratch the hub seal bore surface. steer knuckle.
6. Remove the inner bearing cone.
Steering Axles With RSA Drum Brakes
7. Remove the bearing cups with a suitable
puller. 1. Remove all air from the air system.
2. Remove the air lines from the air chamber.
Remove the Brake Drum or Disc Tag the lines and ports to aid reassembly.
Brake Rotor
! WARNING
1. Match mark the drum and hub.
When you work on a spring chamber, carefully
2. Remove the capscrews and washers from the follow the service instructions of the chamber
brake drum or rotor joint. manufacturer. Sudden release of a compressed
spring can cause serious personal injury.
! WARNING 3. If the brake has spring chambers, manually
Take care when you use lifting devices. When you compress and lock the springs to release the
use a lifting strap, inspect the strap for damage brakes.
before you use it. Do not use a lifting strap to
shock load or drop load a component. Serious 11
personal injury and damage to components can
result.
Section 3
Disassembly

4. Match mark the air chamber housing tube Steering Axles With RSH Drum Brakes
and the brake spider plunger housing to aid
reassembly. 1. Remove the hydraulic lines from the hydraulic
5. Remove the set-screw that retains the air chamber. Tag the lines to aid reassembly.
chamber assembly in the spider plunger 2. Match mark the hydraulic chamber housing
housing. tube and the brake spider plunger housing to
6. If there is a collet nut on the threads of the aid reassembly.
chamber housing tube: Use a hammer and a 3. Remove the set screw that retains the fluid
brass drift to loosen the collet nut. within the spider plunger housing.
7. Remove the air chamber assembly from the 4. If there is a collet nut on the threads of the
plunger housing. If necessary, use a strap chamber housing tube: Use a hammer and a
wrench to remove the air chamber assembly. brass drift to loosen the collet nut.
8. Remove the brake shoe return springs. 5. Remove the hydraulic chamber assembly
9. Rotate the brake shoes to allow access to the from the plunger housing. If necessary, use a
spindle/brake spider mounting capscrews. strap wrench to remove the hydraulic
chamber assembly.
10. Match mark the brake spider and steering
knuckle to aid correct installation at assembly. 6. Remove the brake shoe return springs.

11. Remove the two capscrews and washers that 7. Rotate the brake shoes to allow access to the
mount the brake spider and spindle to the spindle/brake spider mounting screws.
steering knuckle at the 11 and 1 o’clock 8. Match mark the brake spider and steering
positions. knuckle to aid reassembly.
12. To aid spindle removal, install two 4- 6-inch 9. Remove the two capscrews and washers that
(10.16-15.24 cm) long studs with 0.875-14 UNF mount the brake spider and spindle to the
threads on the end that engage the steering steering knuckle at the 11- and 1-o’clock
knuckle. positions.
13. Support the spindle and brake spider 10. To aid spindle removal, install two 4- 6-inch
assembly. (10.16-15.24 cm) long studs with 0.875-14 UNF
14. Remove the remaining capscrews and threads on the end that engage the steering
washers. knuckle.

15. Remove the brake spider and brake shoe 11. Support the spindle and brake spider assembly.
assembly. 12. Remove the remaining capscrews and
washers.
! CAUTION 13. Remove the brake spider and brake shoe
Avoid damaging the oil seal in the spindle when assembly.
you remove the spindle. Lubricant loss and
damage to components can result. ! CAUTION
16. Carefully remove the spindle from the Avoid damaging the oil seal in the spindle when
steering knuckle by sliding the spindle over you remove the spindle. Lubricant loss and
the outer end of the axle shaft and universal damage to components can result.
joint.
14. Carefully remove the spindle from the steering
17. Remove the axle shaft and universal joint knuckle by sliding the spindle over the outer end
assembly. of the axle shaft and universal joint.
15. Remove the axle shaft and universal joint
assembly.

12
 Section 3
Disassembly

Steering Axles With P Series 7. Remove the brake camshaft from the spindle.
Cam Brakes Separate the washers you removed from the
face of the spindle boss. Prevent the washers
from mixing with the washers you previously
1. Remove the brake shoe return springs. removed.
2. Rotate the brake shoes until enough clearance
exists to remove the spindle mounting nuts ! WARNING
and washers with a wrench. Take care when you use lifting devices. When you
3. Remove the spindle mounting nuts and use a lifting strap, inspect the strap for damage
washers. before you use it. Do not use a lifting strap to
shock load or drop load a component. Serious
! CAUTION
personal injury and damage to components can
result.
Avoid damaging the oil seal in the spindle when
you remove the spindle. Lubricant loss and 8. Use straps and a lifting device to support the
damage to components can result. spindle and brake shoe assembly.

4. Carefully remove the spindle from the 9. Match mark the housing and spindle flange.
steering knuckle by sliding the spindle over 10. Remove the mounting capscrews and
the outer end of the axle shaft assembly. washers.
5. Remove the axle shaft and universal joint 11. Remove the spindle from the axle housing.
assembly.

Rigid Axles With P Series Cam Brakes PRC 1756 W3H

Some rigid axles feature a two-piece camshaft The PRC 1756 W3H features a WDB design. The
and coupling which allows you to remove the brake piston housing and the spindle are fastened
camshaft without removing the slack adjuster. to the axle housing with the same capscrews.
When servicing an axle with a two-piece camshaft
and coupling, proceed to Step 6. 1. Use straps and a lifting device to support the
brake piston housing.
1. Remove the brake shoe return springs.
2. Remove the mounting capscrews and
2. Rotate the brake shoes to allow access to the mounting O-rings under the capscrew head.
brake camshaft and the spindle mounting
capscrews. 3. Remove the brake piston housing.

3. Remove the slack adjuster clevis pin that

connects the air chamber push rod. ! CAUTION
4. Remove the snap ring and washers that Take care not to damage O-rings between brake
connect the slack adjuster to the brake piston housing and spindle and between spindle
camshaft. Stack the washers and separate and axle housing.
them from other parts. 4. Use straps and a lifting device to support the
5. Remove the slack adjuster and washers. spindle.
Separate the washers from other parts and 5. Remove two assembly hex socket screws.
prevent them from mixing with the washers
you previously removed. 6. Remove spindle from axle housing.
6. Remove the snap rings that retain the
camshaft in the spindle support boss. ! CAUTION
Take care not to damage O-rings between brake
piston housing and spindle and between spindle
and axle housing.

13
Section 4
Prepare Parts for Assembly

Clean Ground or Polished Parts Clean Axle Assemblies

• A complete axle assembly can be steam
! WARNING cleaned on the outside to remove dirt.
To prevent serious eye injury, always wear safe • Before the axle is steam cleaned, close or put a
eye protection when you perform vehicle cover over all openings in the axle assembly.
maintenance or service. Examples of openings are breathers or vents
in air chambers.
Solvent cleaners can be flammable, poisonous
and cause burns. Examples of solvent cleaners
are carbon tetrachloride, emulsion-type cleaners Dry Cleaned Parts
and petroleum-based cleaners. To avoid serious
personal injury when you use solvent cleaners, • Dry the parts immediately after cleaning and
you must carefully follow the manufacturer’s washing.
product instructions and these procedures:
• Dry the parts with soft clean paper or rags.
• Wear safe eye protection.
• Wear clothing that protects your skin.
• Work in a well-ventilated area. ! CAUTION
Damage to bearings can be caused if dried by
• Do not use gasoline or solvents that contain
rotating with compressed air.
gasoline. Gasoline can explode.
• You must use hot solution tanks or alkaline • Except for bearings, parts can be dried with
compressed air.
solutions correctly. Follow the manufacturer’s
instructions carefully.
Prevent Corrosion
• Use a cleaning solvent to clean ground or
polished parts or surfaces. Kerosene or diesel • Apply a light lubricant to cleaned and dried
fuel oil can be used for this purpose. NEVER parts that are not damaged and are to be
USE GASOLINE. assembled.
• Remove gasket material from parts. Be careful • Apply a special material that prevents
not to damage ground surfaces. corrosion to all surfaces. If parts are to be
stored, wrap the parts in special paper that
• DO NOT clean ground or polished parts in a prevents corrosion.
hot solution tank, water, steam or alkaline
solution.
Inspect Parts
Clean Parts With Rough Finishes
It is very important to inspect all parts carefully
• Parts with a rough finish can be cleaned with and completely before the axle or carrier is
cleaning solvent or in a hot solution tank with assembled. Check all parts for wear and replace
a weak alkaline solution. damaged parts. Replacement of damaged or
worn parts will prevent breakdown of assembly
• Parts must remain in hot solution tanks until later.
completely cleaned and heated.
• Parts must be washed with water until the
alkaline solution is removed.

14
 Section 4
Prepare Parts for Assembly

Inspect Tapered Roller Bearings • Deep cracks or breaks in the cup, cone inner
race or roller surfaces.
Inspect the cup, cone, rollers and cage of all
tapered roller bearings in the assembly. If any of
• Bright wear marks on the outer surface of the
roller cage. Figure 4.3.
the following conditions exist, the bearing must
be replaced:
• The center of the large diameter end of the Figure 4.3
rollers are worn level with, or below the surface.
• The center of the large diameter end of the
rollers are worn to a sharp edge. Figure 4.1.

Figure 4.1 WORN RADIUS

WEAR MARKS

• Damage on rollers and on surfaces of the cup

and cone inner race that touch the rollers.
Figure 4.4.
WORN SURFACE

Figure 4.4
• A visible roller groove in the cup or cone inner ETCHING & PITTING
race surfaces. The groove can be seen at the
small or large diameter end of both parts.

Figure 4.2

CRACK WEAR GROOVES

Figure 4.2.

15
Section 4
Prepare Parts for Assembly

• Damage on the cup and cone inner race • Remove nicks, marks and burrs from parts
surfaces that touch the rollers. Figure 4.5. having machined or ground surfaces. Use a
fine file, India stone, emery cloth or crocus
cloth for this purpose.
Figure 4.5
SPALLING & FLAKING • Clean and repair threads of fasteners and
holes. Use a die or tap of the correct size or a
fine file for this purpose.

! CAUTION
Threads must be without damage and clean so
that accurate adjustment and correct torque
values can be applied to fasteners and parts.
• Tighten all fasteners to correct torque values.

! WARNING
Do not repair axle housings by bending or
straightening. Repair of axle housings by bending
or straightening can cause poor performance and
possible unsafe operation of the axle. This can
cause serious personal injury.

Repair Welding
Do not repair weld drive axle assemblies. Repair
Inspect Planetary Wheel End welding can detract from the structural integrity of
Components a component, particularly to heat treated parts
where the benefit of heat treatment can be
nullified by welding.
Inspect the planetary reduction, planetary gears,
sun gear and ring gear assembly for wear or
damage. Replace gears, shafts or thrust washers Remove Capscrews Fastened With
that are scored, pitted, ridged, chipped or worn. Liquid Adhesive
Repair or Replace Parts ! CAUTION
Do not use impact wrenches or strike components
Replace worn or damaged parts of an axle with a hammer.
assembly. The following are some examples to
check for repair and possible replacement: To remove capscrews fastened with liquid
adhesive, use the regular mechanical disassembly
• Replace any fastener if corners of the head are procedure.
worn.
If the removal of a capscrew, for example,
• Replace washers if damaged. becomes difficult due to a worn head or unusually
• Replace gaskets, oil seals or grease seals at the high breakaway torque, the locking strength can
time of axle repair. be reduced by heating the threaded area to
approximately 300°F (150°C). Heat slowly to avoid
• Clean parts and apply new liquid gasket thermal stresses in components.
material where required when axle is
assembled.

16
 Section 4
Prepare Parts for Assembly

Cleaning NOTE: Do not apply liquid adhesive to the

fastener. Trapped air in the threaded hole will
create back pressure and “blow out” the
! WARNING adhesive as the fastener advances.
To avoid serious personal injury, trichloroethylene 2. Apply Loctite® No. 277 adhesive to the
must not come in contact with your skin. Do not threaded holes only. Before threading in the
smoke and avoid breathing vapors in closed fasteners, visually check to make sure that
rooms without ventilation. Do not use the adhesive contacts the threads. Figure 4.6.
trichloroethylene near flames, welding operations
or hot surfaces exceeding 900°F (482°C).
Figure 4.6
Clean the capscrew, nut or bolt tapped hole and
fastener thread carefully. Use a cleaning solvent
such as trichloroethylene or equivalent to remove
dirt, oil, grease or moisture.

Using Dri-Loc Fasteners and

Meritor Liquid Adhesive
NOTE: Do not apply Meritor liquid adhesive or
any other type of fastener retainer material,
sealant or adhesive on Dri-Loc fasteners or in the
threaded holes.

NOTE: No cure time is required for Dri-Loc 3. Tighten the fasteners to the specific torque
fasteners before rebuilding the axle and returning value recommended for the fastener. Loctite®
it to service. No. 277 will not alter the torque requirement.
NOTE: No cure time is required for Loctite® No.
1. Wipe excess oil residue from the threaded 277 before rebuilding the axle and returning it to
holes of all components that use Dri-Loc service.
fasteners.
4. When servicing drive units assembled with
2. Assemble the components that use Dri-Loc Dri-Loc fasteners or with Loctite® No. 277 in
fasteners. threaded holes where the fasteners do not
3. Tighten the Dri-Loc fasteners to the specified require removal: Check each fastener for
torque value. tightness by tightening the fastener to the
minimum specified torque.
Reusing Dri-Loc Fasteners and • If the fastener does not rotate, the fastener
Loctite® No. 277 is tightened to the correct torque.
• If the fastener rotates to any degree,
! WARNING remove it from the component and apply
liquid adhesive to the threaded hole.
Take care when you use Loctite® to avoid serious
personal injury. Follow the manufacturer’s
instructions to prevent irritation to the eyes and
skin.

1. Wipe excess oil residue from the Dri-Loc

fasteners and threaded holes.

17
Section 4
Prepare Parts for Assembly

Applying Silicone Gasket Material 5. Assemble the components quickly to permit the
gasket material to compress evenly between
Axletech recommends the following liquid gasket parts.
materials: 6. Tighten the fasteners with the required torque.

• ThreeBond 1216
Flush Lube From the Axle
• Loctite® 5699
The rigid axle wheel end and housing bowl share
! WARNING
the same oil. Lubricant contamination of the wheel
end or housing bowl can spread to all areas of the
Take care when you use silicone gasket materials axle.
to avoid serious personal injury. Follow the
manufacturer’s instructions to prevent irritation 1. If the housing bowl has magnets, remove all
to the eyes and skin. metallic debris from the magnets.
2. Flush lubricant from the entire axle, including
! CAUTION the wheel ends and housing bowl, before you
assemble the axle.
The amount of liquid gasket material applied must
not exceed a 0.125 in. (3.18 mm) diameter bead.
Too much gasket material can block lubrication
passages and result in damage to components.
1. Remove all old gasket material from both
surfaces.
2. Clean the surfaces where liquid gasket material
will be applied. Remove all oil, grease, dirt and
moisture.
3. Thoroughly dry both surfaces.
4. Apply approximately a 0.125 inch (3.18 mm)
diameter continuous bead of liquid gasket
material around one surface.
Also apply gasket material around the edge of all
fastener holes on that surface. Figure 4.7.

Figure 4.7
0.125" (3.18 MM)
DIAMETER
SILICONE GASKET
MATERIAL BEAD

18
Notes
Section 5
Assembly

Install the Spindle Figure 5.2

Install the Spindle on Rigid Axles

With P Series Cam Brakes

! WARNING
To prevent serious eye injury, always wear safe
eye protection when you perform vehicle
maintenance or service. GASKET
MATERIAL
1. Install two 4-inch (10.14 cm) long temporary
studs into the axle housing flange at the 1-
and 11- o’clock positions. Figure 5.1.
4. Install and hand tighten the spindle mounting
capscrews and washers. Remove the
Figure 5.1 temporary studs and replace them with
capscrews and washers.
5. Tighten the capscrews according to the
torque specifications shown in Table A.

Table A: Spindle Mounting Capscrew Torque

Specifications
Torque
Size lb-ft N•m
1/2"-12 85-115 115-156
9/16"-18 130-165 176-224
5/8"-11, - 18 210-230 284-311
2. Apply a 0.125-inch (3.18 mm) diameter 3/4"-10 310-400 420-542
continuous bead of liquid gasket material 7/8"-9, - 14 575-650 779-880
around the flange mounting face of the axle
1"-12, - 14 850-1100 1152-1491
housing.
6. Replace the brake camshaft bushings and
! WARNING grease seals in the spindle boss and camshaft
brackets. Refer to Maintenance Manual 4,
Take care when you use lifting devices. When you Cam Brakes. To order call AxleTech
use a lifting strap, inspect the strap for damage International’s Customer Service Center at
before you use it. Do not use a lifting strap to 877-547-3907 or send a fax to 866-547-3987.
shock load or drop load a component. Serious
personal injury and damage to components can 7. Install the cam head thrust washer onto the
result. camshaft. Apply STC 05-201 or -202 chassis
grease to the camshaft bushings and journals.
3. Align the spindle and axle housing match
marks. Install the spindle on the axle housing. 8. Install the camshaft through the spindle
If necessary, use an overhead crane to lift and bushings. Install the washers and slide the
support large spindles. Figure 5.2. camshaft through the air chamber support
bracket.
• For two-piece camshaft designs: Engage
the coupling when you install the
camshafts.
9. Install the slack adjuster, washers, and snap
ring. Connect the slack adjuster to the air
chamber push rod yoke. Check that the snap
ring is installed to the camshaft at the inner
face of the spindle boss.
20
 Section 5
Assembly

Install the Spindle on Rigid Axles With Figure 5.4

360 mm Wet Disc Brake PRC 1756 W3H

! WARNING
BRAKE
PISTON
HOUSING
To prevent serious eye injury, always wear safe
eye protection when you perform vehicle
maintenance or service.
1. Install two 4-inch (10.14 cm) long temporary
studs into the axle housing flange at the 1-
and 11- o’clock positions. Figure 5.3.

Figure 5.3
7. Prepare the mounting capscrews. Ensure
every capscrew has it’s own new O-rings at
capscrew head completely inside the radius
pocket.
8. Tighten the capscrews according to the
torque specifications shown in Table B.

Table B: Spindle Mounting Capscrew Torque

Specifications
Torque
Size lb-ft N•m
2. Use new O-ring and mount it on spindle pilot. 1/2"-12 85-115 115-156
Take care not to pinch the O-ring and cut it. 9/16"-18 130-165 176-224
5/8"-11, - 18 210-230 284-311
! WARNING 3/4"-10 310-400 420-542
Take care when you use lifting devices. When you 7/8"-9, - 14 575-650 779-880
use a lifting strap, inspect the strap for damage 1"-12, - 14 850-1100 1152-1491
before you use it. Do not use a lifting strap to M24-3 850-1100 1152-1491
shock load or drop load a component. Serious
personal injury and damage to components can
result.
3. Align the spindle and axle housing match
marks. Install the spindle on the axle housing.
If necessary, use an overhead crane to lift and
support large spindles. Figure 5.4.
4. Install and tighten the (2) assembly set screws.
5. Install and hand tighten the spindle brake
piston housing mounting capscrews and
O-rings. Remove the temporary studs and
replace capscrews and O-rings.
6. Use new O-ring and mount it on spindle to
brake piston housing pilot. Take care not to
pinch the O-ring and cut it. Align the brake
piston housing and spindle marks. Install the
brake piston housing or spindle. Use an
overhead crane to lift and support large
spindles. Figure 5.4.

21
Section 5
Assembly

Install the Spindle on Rigid Axles With Install the Spindle on Steering Axles
Dry Disc Brakes With P Series Cam Brakes
1. For axle models that use capscrews to mount 1. Install the differential carrier assembly and
the spindle: Install two 4-inch (10.14 cm) long the steering knuckles on the steering axles.
temporary studs into the axle housing flange at
the 1-and 11-o’clock positions. Figure 5.1. 2. Apply a thin coat of NLGI grade 1 or 2 grease
to the following areas:
2. For axle models that use a “bow-tie” caliper
configuration: Use one bolt to guide the • Oil seal lips and bushing bore in the end of
spindle onto the axle. the axle housing

3. Apply a 0.125-inch (3.18 mm) diameter • Axle shaft assembly seal and bushing
continuous bead of liquid gasket material journals
around the flange mounting face of the axle
housing. ! CAUTION
4. Align the spindle with the axle housing Avoid damaging the housing oil seal when you
match marks to correctly position the brake install the shaft assembly. Lubricant loss and
caliper mounting bosses. Install the spindle damage to components can result.
on the axle housing.
3. Carefully install the axle shaft assembly through
5. Install and hand tighten the spindle mounting the steering knuckle and axle housing until the
capscrews and washers. Remove the shaft engages the differential assembly side
temporary studs and replace them with gear. Figure 5.5.
capscrews and washers. 4. If the original shaft support bushing in the bore
• For models with studs in the axle of the spindle is worn or damaged: Remove the
housing: Install washers and locknuts. oil seal and bushing and install a new bushing.
5. Tighten the capscrews or locknuts according
to the torque specifications shown in Table B. Figure 5.5

Table B:Spindle Mounting Capscrew and Locknut

Torque Specifications
Torque
Size lb-ft N•m
1/2"-12 85-115 115-156
9/16"-18 130-165 176-224
5/8"-11, - 18 210-230 284-311
3/4"-10 310-400 420-542
7/8"-9, - 14 575-650 779-880
1"-12, - 14 850-1100 1152-1491
5. Install a new oil seal in the spindle bore. Apply a
thin coat of NLGI grade 1 or 2 grease to the seal
lips and bushing bore.

22
 Section 5
Assembly

! CAUTION ! CAUTION
Avoid damaging the oil seal in the spindle when you Avoid damaging the oil seal in the spindle when
install the spindle. Lubricant loss and damage to you install the spindle. Lubricant loss and damage
components can result. to components can result.
6. Carefully install the spindle on the steering 6. Use a lifting device to install the spindle onto the
knuckle by carefully sliding it over the outer end steering knuckle. Carefully slide the spindle over
of the axle shaft assembly. the outer end of the axle shaft assembly and
engage the two temporary guide studs.
7. Install the spindle mounting washers and nuts.
Hand tighten the nuts. 7. Align the brake spider and brake shoe
assembly with the spindle match marks.
8. Tighten the 3/4-inch-19 nuts or capscrews to
Install the brake spider and brake shoe
310-400 lb-ft (420-542 N•m).
assembly on the spindle. Refer to
9. If you removed the brake shoes or camshaft: Maintenance Manual 4P, Off-Highway Heavy-
Install the brake shoes or camshaft. Refer to Duty Brakes.
Maintenance Manual 4, Cam Brakes. To order
call AxleTech International’s Customer Service 8. Install the spindle and brake spider mounting
Center at 877-547-3907 or send a fax to capscrews and washers. Remove the two
866-547-3987. temporary studs you installed during
disassembly. Replace the temporary studs
with capscrews and washers.
Install the Spindle on Steering Axles
With RSA Drum Brakes 9. Tighten the capscrews according to the
torque specifications shown in Table C.
1. Install the differential carrier assembly and
the steering knuckles on the steering axle. Table C: Spindle Mounting Capscrew and
2. Apply a thin coat of NLGI grade 1 or 2 grease Locknut Torque Specifications
to the following areas: Torque
• Oil seal lips and bushing bore in the end of Size lb-ft N•m
the axle housing 1/2"-12 85-115 115-156
• Axle shaft assembly seal and bushing 9/16"-18 130-165 176-224
journals 5/8"-11, - 18 210-230 284-311
3/4"-10 310-400 420-542

! CAUTION
7/8"-9, - 14
1"-12, - 14
575-650
850-1100
779-880
1152-1491
Avoid damaging the housing oil seal when you
install the axle shaft assembly. Lubricant loss and 10. Install the air chamber assembly into the
damage to components can result. brake spider. Refer to Maintenance Manual
3. Carefully install the axle shaft assembly 4P, Off-Highway Heavy-Duty Brakes.
through the steering knuckle and axle 11. Install the brake shoe return spring.
housing until the shaft engages the
differential assembly side gear. 12. Connect the air lines to the correct ports in
the air chamber assembly. Release the spring
4. If the original shaft support bushing in the chamber after you adjust the wheel hub.
bore of the spindle is worn or damaged:
Remove the oil seal and bushing and install a
new bushing.
5. Install a new oil seal in the spindle bore.
Apply a thin coat of NLGI grade 1 or 2 grease
to the seal lips and bushing bore.

23
Section 5
Assembly

Install the Axle Shaft in

Rigid Axle Models
! CAUTION
Use extreme care to avoid nicking the oil seal
Install the axle shaft through the spindle bore and wear sleeve end when you install the oil seal
housing until it engages the differential side gear. wear sleeve. A nicked oil seal wear sleeve end
The shaft end with the snap ring groove must can damage the seal lip when you install the
extend beyond the outer end of the spindle. wheel hub. Lubricant loss and damage to
components can result.
Assemble the Ring Gear 5. If a sleeve is used, carefully install a new oil
Hub Assembly seal wear sleeve on the spindle.
6. Lubricate the seals in the following areas
NOTE: Install the ring gear immediately before only.
you assemble the planetary spider.
• Conventional seals: Lubricate the oil seal
1. Install the outer wheel bearing cone on the lips.
ring gear hub journal squarely against the
hub shoulder. • Unitized seals: Lubricate the inside
diameter of the seal.
2. Apply the same lubricant used in the wheel
ends to the rollers. • Face seals: Lubricate the contact surfaces
of the metal rings. Do not apply lubricant
3. Slip fit the bearing cone over the ring gear to any other part of the face seal.
hub journal. Do not install the ring gear hub
assembly on the spindle at this time. 7. Apply a thin coat of lubricant to the oil seal
journal surface of the spindle.
Assemble the Hub, Bearings, Oil 8. Install the brake rotor or drum and oil slinger.
Seal and Drum or Rotor • If the slinger fits loosely between the hub
and drum: Apply a bead of liquid gasket
1. If the hub bearing cups need to be replaced, material to prevent rattling.
install the new cups with a suitable driver.
9. Install the drum or rotor mounting capscrews
NOTE: Most models require installation of the and washers.
inner bearing cone prior to installation of the • For dual tire models: Align the air valve
wheel hub oil seal into the bore of the wheel hub. stem clearance notch in the drum outside
2. Apply lubricant to the inner bearing cone diameter with the wheel hub notch.
rollers. Install the bearing cone into the 10. Tighten the capscrews according to the
wheel hub. torque specifications shown in Table D.
3. If used, install the oil seal guard washer.
4. Position the new wheel hub oil seal so that Assemble the Hub, Bearings, Oil
the spring lip of the seal faces the wheel Seal and Brake Driver (PRC 1756
bearing. Use a suitable seal driver to drive the
seal into the same location as the original
W3H)
wheel hub oil seal. Refer to the following list
1. If the hub bearing cups need to be replaced,
for three possible seal installation locations:
install the new cups with a suitable driver.
• Bottom of the hub bore
• Pushed-in until it contacts the guard NOTE: This model requires installation of the
washer inner bearing cone into the hub and the wheel
• Flush with the end face of the hub hub oil seal into the bore of the brake driver.

24
 Section 5
Assembly

2. Apply lubricant to the inner bearing cone Install the Wheel Hub
rollers. Install the bearing cone into the
wheel hub. Figure 5.6.
! WARNING
Figure 5.6 Take care when you use lifting devices. When you
use a lifting strap, inspect the strap for damage
before you use it. Do not use a lifting strap to
shock load or drop load a component. Serious
personal injury and damage to components can
result.
1. Use a lifting device to carefully lift and slide the
wheel hub assembly over the spindle. Keep the
wheel hub assembly aligned with the spindle to
avoid oil seal damage. Figure 5.7 and Figure 5.8.
For PRC 1756 W3H, refer to Maintenance Manual
Mm-20195 for care of brake seal and wet disc
brake prior to mounting the hub.
3. Install the hub seal into the brake driver, so
that it bottoms out inside the bore. • For axle models with three threaded holes
(5/8 inch-11 UNC) in the boss area near
! CAUTION the outer wheel bearing: You can
temporarily attach the planetary ring gear
Use extreme care to avoid nicking the oil seal hub assembly to the wheel hub prior to
wear sleeve end when you install the oil seal installation on the spindle.
wear sleeve. A nicked oil seal wear sleeve end
can damage the seal lip when you install the
wheel hub. Lubricant loss and damage to Figure 5.7
components can result.
4. Install O-ring in hub at brake driver joint.
5. Align marks between brake driver and hub and
install and tighten capscrews and washers to the
torque specifications shown in Table D.
Table D: Brake Rotor Mounting Capscrew Torque
Specifications
Torque
Size lb-ft N•m
1/2"-12 85-115 115-156
9/16"-18 130-165 176-224
5/8"-11, - 18 210-230 284-311
Figure 5.8
3/4"-10 310-400 420-542
7/8"-9, - 14 575-650 779-880
1"-12, - 14 850-1100 1152-1491

6. Carefully install a new oil seal wear sleeve on

the spindle. (If necessary)
7. Lubricate the seals in the following areas
only.
• Conventional seals: Lubricate the oil seal
lips.
• Face seals: Lubricate the contact surfaces
of the metal rings. Do not apply lubricant
to any other part of the face seal.
8. Apply a thin coat of lubricant to the oil seal
journal surface of the spindle.
25
Section 5
Assembly

2. Install the ring gear hub assembly, which

includes the outer bearing cone, on the ! CAUTION
spindle. Do not loosen the adjusting nut when you install
3. Install the wheel bearing adjusting nut on the adjusting nut lockplate. Loosening the
the spindle. adjusting nut from the setting in Step 6 can result
in an incorrect bearing preload and damage to
• If you temporarily attached the planetary components.
ring gear hub assembly to the wheel hub
in Step 1: Remove the temporary 7. Use one of the following procedures to install
capscrews from the ring gear hub. the adjusting nut lockplate:
• Place the flat side of the lockplate against a
Adjust the Wheel Bearing Preload flat surface of the nut.

For wheel bearing adjustment procedures for

• Place the lockplate notch over a corner of
the adjusting nut. Figure 5.9.
axles equipped with wet disc brakes, refer to
Axletech Maintenance Manual 4L, Wet Disc
Brakes. To order call AxleTech International’s Figure 5.9 WHEEL BEARING
Customer Service Center at 877-547-3907 or send ADJUSTING NUT
a fax to 866-547-3987. THRUST
WASHER
Single Nut Design with Lockplates
ADJUSTING NUT
1. Tighten the wheel bearing adjusting nut to LOCK PLATE
the initial seating torque listed in Table E,
while rotating the wheel hub.
2. Continue to rotate the hub a minimum of one
full revolution in both directions.
3. Tighten the wheel bearing adjusting nut ADJUSTING
again to the initial seating torque listed in NUT LOCK TO FLAT TO CORNER
Table E, while rotating the wheel hub in both PLATE OF NUT OF NUT
directions.
4. Repeat Steps 1 and 2 until the adjusting nut 8. If necessary, tighten the adjusting nut to align
will not advance with the application of the the lockplate holes with the threaded holes in
initial seating nut torque. the ring gear hub. Do not loosen the adjusting
nut.
5. Loosen the adjusting nut 1/8 – 1/4 turn
6. Tighten the adjusting nut to the final
adjustment nut torque listed in Table E while
rotating the wheel hub.

Table E: Single Wheel Bearing Adjustment

Rigid Steering Adjusting Nut Torque
Axle Axle Initial Seating Final Adjustment
Models Models
lb-ft N•m lb-ft N•m
PRC594-PRC727 PSC594-PSC825 400 542 200 271

PRC1756 PSC826-PSC1617 400 542 350 474

PRLC824-PRLC1794 PSC1794 500 678 400 542

26
 Section 5
Assembly

! WARNING ! WARNING
Take care when you use Loctite® to avoid serious Take care when you use Loctite® to avoid serious
personal injury. Follow the manufacturer’s personal injury. Follow the manufacturer’s
instructions to prevent irritation to the eyes instructions to prevent irritation to the eyes
and skin. and skin.
9. Install new lockplate capscrews with
pre-applied locking agent on the threads. If 8. Install the capscrew. Apply 2 or 3 drops of
you use the original capscrews, apply 2 or 3 Loctite 242 or equivalent to the internal
drops of Loctite 277 or equivalent to the threads of the ring gear hub. Tighten the
internal threads of the ring gear hub. Tighten capscrew 20-30 lb-ft (27-40 N•m). Figure 5.10.
the capscrews 60-75 lb-ft (81-102 N•m).

Scalloped Flange Single Nut Design Figure 5.10

CAPSCREW SUN GEAR
1. Tighten the wheel bearing adjusting nut to
the initial seating torque listed in Table E,
while rotating the wheel hub.
2. Continue to rotate the hub a minimum of one
full revolution in both directions.
3. Tighten the wheel bearing adjusting nut again
to the initial seating torque listed in Table E,
while rotating the wheel hub in both
directions.
4. Repeat Steps 1 and 2 until the adjusting nut
will not advance with the application of the WHEEL BEARING
initial seating nut torque. ADJUSTING NUT
5. Loosen the adjusting nut 1/8 – 1/4 turn
6. Tighten the adjusting nut to the final Double Nut Design
adjustment nut torque listed in Table E while
rotating the wheel hub. 1. Install the wheel bearing adjusting nut so that
the nut lock faces OUTWARD. Installing the
! CAUTION wheel bearing adjusting nut will seat the
bearings and related components.
Do not loosen the adjusting nut when you install
the capscrew. Loosening the adjusting nut from 2. Tighten the nut to 400 lb-ft (542 N•m) while
the setting in Step 6 can result in an incorrect you rotate the hub in both directions.
bearing preload and damage to components. 3. Tap the hub several times with a brass or
7. If necessary, tighten the adjusting nut to align plastic hammer.
a scallop with a threaded hole in the ring gear 4. Tighten the nut to 400 lb-ft (542 N•m).
hub. Do not loosen the adjusting nut.
5. Loosen the adjusting nut to 0 lb-ft (0 N•m) to
relieve the preload on the bearings.
6. Tighten the adjusting nut to 25 lb-ft (34 N•m).
7. Install the nut lock ring washer. Ensure that
the washer tang fits into the slot on the spindle
and that the adjusting nut engages a washer
hole.
8. Install the jam nut. Tighten the jam nut to
600-800 lb-ft (813-1085 N•m).

27
Section 5
Assembly

Install the Planetary Ring Gear 6. Install the needle roller bearings. Install new
needle roller bearings if you replace the
and Sun Gear pinion shafts.
1. Apply grease to the inner face of the sun gear • To install the needle roller bearings: Install
thrust washer (the side with tangs or dowel a row of needle roller bearings around the
pins). Install the thrust washer so that the pinion bore and against the inner thrust
tangs or dowels engage the slots or holes in washer. Install as many needle roller
the wheel bearing adjusting nut. bearings as will fit. The number of needle
roller bearings installed in the pinion bore
2. Install the sun gear on the axle shaft and differs among axle models.
against the thrust washer. Figure 5.9.
7. Place the spacer into the bore of the gear on
3. Install the snap ring into the axle shaft groove. top of the needle rollers. Install another row of
4. Install the planetary ring gear onto the ring needle rollers on top of the spacer.
gear hub. 8. Apply approved STC 05-201 or -202, NLGI
grade 1 or 2 grease to the side of the outer
Assemble the Planetary Spider thrust washer opposite the tang.
9. Place the outer thrust washer on the end of
Meritor coverless spider planetary wheel ends come the planetary gear. The tang must align with
equipped with two different planetary designs. the tang of the opposite washer.
• Planetary pinion shaft with needle roller bearings 10. Set the planetary spider on a level surface
with the flange side facing UP. Carefully slide
• Nylon coated planetary pinion shafts the loaded planetary gear assembly into the
Refer to the correct assembly procedure for the planetary spider. Ensure that the following
type of planetary design you are servicing. conditions exist before you proceed to Step 11:
• The outer thrust washer (large bore) must
Planetary Pinion Shaft With be on top of the gear assembly.
Needle Roller Bearings • The washer tangs must fit in the planetary
spider grooves.
NOTE: For maximum planetary gear life, replace
the pinion shafts and needle roller bearings on • The needle roller bearings must be in place.
both wheel ends at the same time.
11. Install the pinion shaft through the spider, the
1. Separate the inner thrust washers from the planetary gear and the thrust washers. Allow
outer thrust washers. the pinion shaft to extend out from spider. Do
not press the pinion shaft into the spider at
• To differentiate between the thrust this time. Figure 5.11.
washers: Compare the washers’ inner
diameters. Outer thrust washers feature a
larger inner diameter than inner thrust Figure 5.11 PINION CAP
washers. OUTER THRUST SHAFT
WASHER O-RINGS
2. Apply approved STC 05-201 or -202, NLGI
grade 1 or 2 grease to the side of the inner NEEDLE ROLLERS
thrust washer opposite the tang.
SPACER
3. Place the greased side of the inner thrust
PLANETARY GEAR
washer toward the planetary gear. The thrust
washer tangs fit into the spider grooves. NEEDLE ROLLERS
SETSCREW
4. Place the inner thrust washer on the end of INNER SNAP RING
the new planetary gear. THRUST WASHER

5. Apply approved STC 05-201 or -202, NLGI

grade 1 or 2 grease to the planetary gear bore.

28
 Section 5
Assembly

12. Repeat Steps 1-11 to install the second and 5. Install the inner thrust washer (small bore).
third sets of pinion shafts, gears, needle roller Place the washer tab into the spider indent
bearings and thrust washers. and align the washer bore with the spider
13. Check the alignment of the pinion shafts. bore.
6. Apply a thin coat of the same gear lubricant
• Place the spider cover over the shaft ends. used in the wheel end to the planetary
When necessary, rotate the shafts so that
gear bore.
spider cover fits over the flats. After you
align the shafts, remove the cover. 7. Slide the planetary gear and the outer thrust
washer into the spider. Align the bores of the
! WARNING parts and place the outer thrust washer tab
Observe all WARNINGS and CAUTIONS provided into the spider indent.
by the press manufacturer concerning press 8. Apply a thin coat of gear lube to the nylon
operation to avoid serious personal injury and coating on the pinion shaft.
possible damage to components during assembly
and installation procedures. 9. Install the planetary pinion shaft in the spider
and through the planetary gear and thrust
14. Install each pinion shaft into the spider gear washer. Figure 5.12.
assembly by hand.
• If you cannot install a pinion shaft into the Figure 5.12 CAP
spider gear assembly by hand: Use a press SPIDER
to install the pinion shaft into the spider O-RINGS
assembly until the shoulder of the shaft
bottoms against the inner (bottom) thrust
PINION
washer. When a press is not available, use a SHAFT
brass drift and mallet to install the pinion shafts.

Nylon Coated Planetary Pinion Shaft OUTER THRUST

WASHER
1. Inspect the large bore chamfers. The
chamfers must be smooth to prevent damage PLANETARY
GEAR
to the nylon coating on the planetary pinion
shaft during installation. INNER THRUST SETSCREW
WASHER
• If the large bore chamfers are not smooth: (SMALL BORE)
Use an emery cloth to clean the chamfer OPTIONAL
SNAP RING
surface.
2. Install a new O-ring into the O-ring groove on 10. Repeat Steps 1-9 to install the second and
the pinion shaft.
third sets of planetary pinion shafts, gears
3. Inspect the planetary gear bores. Do not use and washers.
planetary gears with rough bore surfaces.
11. Install the set screw into the spider to secure
the pinion shaft. For PRC 1756 W3H, install
! WARNING
the snap rings at the end of the pinion shaft.

Observe all WARNINGS and CAUTIONS provided 12. Using appropriate tool, press caps at outer
by the press manufacturer concerning press opening of pinion shaft bores.
operation to avoid serious personal injury and
possible damage to components during assembly
and installation procedures.
4. Place the spider in a press with the flange
side UP. Support the spider as required.

29
Section 5
Assembly

Install the Planetary 5. Tighten the wheel studs, capscrews or nuts

according to the torque specifications shown
Spider Assembly in Table F.

! WARNING Table F: Planetary Spider Mounting Capscrew and

Take care when you use silicone gasket materials Stud Torque Specifications
to avoid serious personal injury. Follow the Torque
manufacturer’s instructions to prevent irritation
to the eyes and skin. Size lb-ft N•m
1/2"-13 85-115 115-156

! CAUTION
9/16"-12
5/8"-11, – 14
130-165
210-230
176-224
284-311
Use only the correct gasket material. Do not use
3/4"-10 310-400 420-542
non-approved gasket material. Lubricant loss and
damage to components can result. 7/8"-14 575-750 780-1017

1. Apply silicone (RTV) gasket material to the

spider flange at the hub mounting face. Refer Adjust the Brakes
to “Applying Silicone Gasket Material” in
Section 4. For PRC 1756 W3H install new O- Adjust the brakes for axles with P series and RSA
ring on spider pilot. drum brakes only.
• For P series brakes: Refer to Maintenance
! CAUTION Manual 4, Cam Brakes.
Take care not to pinch the O-ring during • For RSA brakes: Refer to Maintenance Manual
assembly. 4P, Off-Highway Heavy Duty Brakes.
2. Install the spider and pinion assembly in the To order call AxleTech International’s Customer
wheel hub. Align the planetary gear teeth with Service Center at 877-547-3907 or send a fax to
the sun gear and ring gear teeth. Align the 866-547-3987.
spider flange and wheel hub match marks you
previously marked at disassembly. Figure 5.13.
Install the Tires and Rims
Figure 5.13 1. Install the tires and rims. Secure them with
wheel rim clamps, nuts and washers.
2. Tighten the wheel nuts according to the
vehicle manufacturer's specifications.

Fill the Wheel Ends With Lubricant

1. Rotate the wheel end until the oil fill line and
oil level line are parallel to the ground.
2. Lower the vehicle to the ground.
O-ring
3. Remove the oil fill plug from the cover. Clean
all magnetic plugs and install the oil drain
3. Correctly align the spider mounting holes plug in the spider prior to filling the wheel
with the wheel hub holes or studs. Push the end with lubricant.
spider assembly against the hub.
4. Install the nuts and washers or capscrews and
washers.
• To install studs with integral hex and
washers: Use a 3.25-inch internal depth,
extra deep socket.

30
 Section 5
Assembly

NOTE: The rigid axle wheel end and housing Tire Matching for Tandem
bowl share the same oil and oil level.
and Tridem Axles
4. Fill each wheel-end and the axle housing
bowl to the bottom of the fill/level plug hole
with the specified oil. Do not fill oil through ! CAUTION
the bowl only. Unmatched tires on both tandem drive units and
5. Wait for the oil to evenly flow through the axle. tridem drive units will cause tire wear and
scuffing and possible damage to the drive units.
6. Check the oil level. Add oil if necessary. Axletech recommends that the tires be matched
7. Replace and securely tighten all plugs. to within 1/8-inch (3.18 mm) of the same rolling
radius, 3/4-inch (19.05 mm) of the same rolling
circumference.
Measure and Adjust the
Toe Setting Tandem Axles
Toe is the difference in distance between the The four largest tires should never be installed on
front of the front tires and the rear of the front one driving axle or the four smallest tires on the
tires. Figure 5.14. other driving axle. Such tire mounting will cause
an interaxle “fight,” unusually high axle lubricant
temperatures that result in premature lubricant
Figure 5.14 breakdown and possible costly axle service.
FORWARD
X
In addition to matching individual tire rolling radii
or rolling circumference, AxleTech recommends
matching, as nearly as possible, the total tire
circumference of one driving axle to the total tire
circumference of the other driving axle. This will
usually result in satisfactory tandem axle lubricant
temperatures that lengthen drive unit service with
higher tire mileage.
Park the vehicle on a level surface. The vehicle
Y
must carry a correctly distributed rated capacity
TOP VIEW load. All the tires must be the same size.
Measure new tires to verify that they will be
Y MINUS X EQUALS TOE-IN correctly matched.
1. Inflate all tires to the same pressure.
Check and adjust the toe setting after you install 2. Carefully measure the rolling circumference
any of the following components: of each tire with a steel tape.
• a front steering axle 3. Mark the size on each tire with chalk and
• a new steering knuckle arrange the tires in order of size, largest to
• a tie rod component smallest.

Axletech performs the toe adjustment with the 4. Mount the two largest tires on one side of one
axle in an unloaded condition. axle and mount the two smallest on the
opposite side of the same axle.
The toe specification for Axletech off-highway
steering axles is 1/16-inch (1.60 mm) toe-in 5. Mount the four other tires on the other axle in
[± 1/16-inch (1.60 mm)]. This specification is the same manner.
based on a 24-inch (60.96 cm) radius (theoretical
tire with a 48-inch (121.92 cm) outside diameter).

31
Notes

6. Test run the vehicle to gather accurate rear

axle lubricant temperature readings on the
two axle lubricant temperature gauges.
7. Vary tire air pressure within the tire
manufacturer's recommended range so the
lubricant temperature of both axles is within
30°F (-1°C) of each other and not in excess of
200°F (93°C). This will usually result in
uniform tire loading and good tire life.

Tridem Axles
When three driving axles are “hooked” together
in a tridem series, unmatched tires will compound
the problems described in the preceding
paragraphs. AxleTech recommends matching, as
nearly as possible, the total tire circumference of
each of the three driving axles.
To match tires on tridem units, follow the same
procedure used for tandem units.
Arrange the tires in order of size:
• The two largest and two smallest go on one
axle.
• The next two largest and smallest go on the
second axle.
• The remaining four tires go on the third axle.

32
 Section 6
Lubrication

Lubrication Schedule
Operation Off-HighwayÀ
Initial Oil Change 100 operating hoursÀ

Check Oil Level 250 operating hoursÀ

Petroleum Oil 1,500 operating hours or twice a year

Change (whichever comes first)À

Synthetic Oil or 3,000 operating hours or once a year

Semi-Synthetic Oil (whichever comes first)
Change

À The interval depends on the individual operating conditions, speeds and loads. Severe operating conditions may
require more frequent intervals.
PRC 1756 is equipped with magnets in the axle housing, as a result, the initial oil change is waved.

Outside Temperature
°F °C
Axletech Oil
Specifications Description Min. Max. Min. Max.
STC 05-001, Gear Oil GL-5, SAE 85W/140 10 None -12 None

STC 05-003, Gear Oil GL-5, SAE 80W/90 -15 None -26 None

STC 05-004, Gear Oil GL-5, SAE 75W/90 -40 None -40 None

STC 05-006, Gear Oil GL-5, SAE 75W/140 -40 None -40 None

STC 05-007, Gear Oil GL-5, SAE 75W/140 -40 None -40 None

STC 05-008, Gear Oil GL-5, SAE 75W/90 -40 None -40 None

33
 Section 7
Specifications

8
Rigid Axle Wet Disc Brake 3

10

Rigid Axle Drum Brake

8
3

4
10

6
13

34
 Section 7
Specifications

Rigid Axle Dry Disc Brake

8 7

12
10

11

Steering Axle Dry Disc Brake

9 7

10

35
 Section 7
Specifications

SPINDLE MOUNTING O-RING

PRC 1756 W3H CAPSCREW

WHEEL
O-RING BEARING
ADJUSTING
NUT

CAP

PLANETARY
SPIDER
MOUNTING
CAPSCREW

O-RING

CAP SCREW

NOTE: See Wet Brake Manual MM-20195 for these fastener torques.

36
 Section 7
Specifications

Planetary Axle Wheel End Torque Specifications

Torque
Item Fastener Description Size lb-ft N•m
1 Planetary Spider Mounting Capscrew 1/2"-13 85-115 115-156
9/16"-12 130-165 176-224
5/8"-11, -14 210-230 284-311
3/4"-10 310-400 420-542
7/8"-14 575-750 780-1017
2 Wheel Stud Nut 3/4"-10 310-400 420-542
7/8"-14 575-750 780-1017
3 Lockplate Capscrew 3/8"-16 30-45 41-61
4 Wheel Bearing Adjusting Nut Refer to “Adjusting the Wheel Bearing Preload”
in Section 5.
5 Wet Brake Driver Mounting Capscrew 7/8"-14 575-750 780-1017
1"-12 850-1100 1152-1491
6 Brake Drum Mounting Capscrew 5/8"-11, -18 210-230 284-311
9/16"-18 130-165 172-224
3/4"-10 310-400 420-542
7/8"-14 575-750 780-1017
7 Brake Rotor Mounting Capscrew 1/2"-12 85-115 115-156
9/16"-18 130-165 176-224
5/8"-11, -18 210-230 284-311
3/4"-10 310-400 420-542
7/8"-9, -14 575-650 779-880
1"-12, -14 850-1100 1152-1491
8 Spindle Mounting Capscrew 1/2"-12 85-115 115-156
9/16"-18 130-165 176-224
5/8"-11, -18 210-230 284-311
3/4"-10 310-400 420-542
7/8"-9, -14 575-650 779-880
(Nut on Stud) 1"-12, -14 850-1100 1152-1491
M24X3 625-810 850-1100
9 Spindle to Steer Knuckle Capscrew 1/2"-13 85-115 115-156
5/8"-11 210-230 284-311
9/16"-12 130-165 176-224
7/8"-14 575-750 780-1017
10 Pinion Shaft Locknut 3/8"-16 30-45 41-61
11 Caliper Adapter to Spindle Bolt 7/8"-9 440-580 597-786
12 Caliper to Adapter Capscrew 3/4"-10 310-400 420-542
M20 369-479 500-650
13 Wheel Rim Clamp Nut Refer to OEM specifications
14 Cap Screw M16X2 200-258 270-350
Oil Level/Drain Plug (Not Shown) 3/4"-14 35 47
Planetary Ring Gear Lock Capscrew 3/8"-16 35-50 47-68
(Not Shown) 7/16"-14 60-75 81-102

37
Suite 400 AxleTech International France AxleTech do Brasil Sistemas Automotivos Ltda.
3001 West Big Beaver Road 4, Rue Jean Servanton Avendia Joao Batista, 830
Troy, Michigan 48084 Boite Postale 656 Centro-Osasco-SP
U.S.A. 42042 Saint Etienne Cédex 1 06097095 Brasil
Toll Free: 877-877-9717 France Phone: +55 11 36846641
Non-Toll Free: 248-816-5401 (33) 477.92.88.00 Fax: +55 11 36846859
Fax: 248-435-1990 Fax: (33) 477.92.88.93
Website: www.axletech.com

MM9G © Copyright AxleTech International

Revised 05-06 Printed in the USA