Service Manual D__R440, 460, 480, D_R461, 462, 463, 521, 581, 601, 651, 652, 653 Owner manual
Table Of Contents
- Warnings and Caution
- Table of Contents - Visual
- Introduction
- Failure Analysis
- Inspection
- Differential Carrier Assembly - Parts
- Forward Axle Differential Carrier Removal and Installation
- Installation of Forward Differential Carrier
- Installation of Forward Axle Housing Cover and Output Shaft Bearing Parts
- Rear Axle Differential Carrier Removal and Installation
- Rear Differential Carrier “Installation”
- Differential Lockout
- Differential Lockout Overhaul
- Original Design Lockout Overhaul
- Cylindrical Design Lockout - Overhaul
- Power Divider - Parts Exploded View
- Remove Power Divider
- Remove Power Divider from Differential Carrier (with carrier removed from axle housing)
- Disassemble, Assemble and Overhaul the Power Divider
- Disassemble Power Divider Cover (For Axles with Input Shaft Tapered Roller Bearing)
- Assemble Power Divider Cover (For Axles with Input Shaft Tapered Roller Bearing)
- Inter-axle Differential
- Output Shaft Assembly
- Install Power Divider on Differential Carrier (with carrier assembled to axle housing)
- Install Power Divider on Differential Carrier (with carrier removed from axle housing)
- Measure and Adjust Input Shaft End-Play
- Forward Axle Carrier Assembly (Single Speed) with Diff. Lock - Parts Exploded View
- Rear Axle (Single Speed) - Parts Exploded View
- Forward Axle (Two Speed) - Parts Exploded View
- Rear Axle (Two Speed) - Parts Exploded View
- Disassemble Differential Carrier (with power divider removed)
- Drive Pinion - Parts Exploded View
- Disassemble and Overhaul Drive Pinion
- Install Drive Pinion Assembly
- Install Helical Gear and Pinion Outer Support Bearing - Forward Axle Only
- Wheel Differential Assembly - Parts Exploded View
- Disassemble, Overhaul and Assemble Wheel Differential (Forward and Rear Axles)
- Planetary and 2-Speed Models (Forward and Rear Axles)
- Disassemble Dual Reduction Differential Case
- Assemble Dual Reduction Differential Case
- Install Differential-Forward and Rear Axles
- Measure and Adjust Carrier Assembly
- Wheel Differential Lock - Parts Exploded View
- Install and Adjust Wheel Differential Lock, Dual Range Shifters
- Piston Air Shift Unit
- Air Shift Unit Replacement
- Air Shift Unit Overhaul
- Housing and Rear Cover Assembly - Parts Exploded View
- Seals
- Housing Breather
- Wheel End Seal - Parts Exploded View
- Remove and Overhaul Wheel End Seal
- Wheel Adjustment Systems
- Verify Wheel End-play Procedure
- Lubricate Wheel End
- Lubrication
- Lube Change Intervals
- Change Lube
- Standpipes
- Torque Chart
- Wheel Differential Lock
- Differential Lock Theory of Operation
- Control Systems
- Dual Range Axle Shift Systems
- Troubleshooting
- Proper Vehicle Towing
- Axle Shift System Components
- Inter-Axle Differential Lockout With Interlock Control Valve (straight-air type)
- Theory of Operation
- Power Flow and Torque Distribution
- Lubrication
- Torque Distribution in Low Range
112
Control Systems
Direct Driver-Controlled System
The driver manually locks and unlocks the wheel differential,
using a cab-mounted air valve. The following description as-
sumes the system includes a cab-mounted air valve and a so-
lenoid valve as shown in the illustration. Operation is as
follows:
1. With control switch in the unlock position, the wheel
differential functions normally.
2. When the control valve is placed in the lock position,
the air supply solenoid valve opens and air pressure
activates the shift unit.The shift fork is moved to en-
gage the sliding clutch which, in turn, locks the wheel
differential.
3. When the control switch is placed in the unlock posi-
tion, air pressure supply to the shift unit is shut off
and air pressure is released from the shift unit. A
compression spring moves the shift fork to disen-
gage the sliding clutch from the flanged case half un-
locking the wheel differential.
1 - Quick release valve
2 - Dry air supply tank 80 - 120 PSI
3 - Rear axle wheel differential lock air shift unit
4 - Fuse or circuit breaker
5 - Fuse or circuit breaker
6 - Indicator light or audible signal
7 - Wheel differential lock selector switch
8 - Exhaust
9 - Wheel differential lock selector switch
10 - Indicator light or audible signal
11 - Power supply
8
9
1
10
6
5
3
11
2
7
4
• Engage only when traction is poor.
WARNING
!
This vehicle is equipped with the
Spicer Driver Controlled Wheel
Differential Lock.
For further information
consult your owners manual
[publication #XX-XXXX]
Steering will be adversely
affected when engaged.
• Do not engage when tires are spinning.
• Disengage when going downhill.
DRIVE CAREFULLY
WHEN ENGAGED
• Disengage at speeds above 25 mph.
Disengaged
Engaged