Operation and maintenance manual

Front Axle Group - Differential Drive Head
2
Section 140-0060
SM 2148 5-02
DESCRIPTION
The axle employs a helical gear housing assembly
containing a helical pinion running in taper roller
bearings. A drive wheel transfers the input torque
through the hypoid form pinion and crownwheel to a
POWR LOK differential. The pinion is supported by
three roller bearings, the outer and centre bearings
being pre-loaded taper roller bearings whilst the nose
bearing is of the plain roller type.
REMOVAL
Numbers in parentheses refer to Fig. 1, unless
otherwise specified.
WARNING
To prevent personal injury and property
damage, be sure wheel blocks, blocking
materials and lifting equipment are properly
secured and of adequate capacity to do the job
safely.
Draining the Oil
1. Position the vehicle (preferably after a short run to
warm the oil) on a level, solid concrete floor, apply the
parking brake and switch off the engine.
2. Block appropriate road wheels and turn the battery
master switch to the 'Off' position.
3. Whilst road wheels are still on the ground, loosen
wheel nuts of each wheel.
LEGEND FOR FIG. 1
1 - Setscrew
2 - Spring Washer
3 - Bearing Retainer
4- Shim
5 - Helical Gear Housing
6- Plug
7 - Outer Bearing Cup
7A - Outer Bearing Cone
8 - Helical Pinion
9 - Inner Bearing Cup
9A - Inner Bearing Cone
10 - Outer Spacer
11 - Inner Spacer
12 - Inner Bearing Cup
12A - Inner Bearing Cone
13 - Pinion
14 - Nose Bearing
15 - Gasket
16 - Dowel
17 - Gear Casing
18 - Bolt
19 - Stud
20 - Differential Housing Body
21 - End Flange
22 - Nut
23 - Adjusting Nut
24 - Bearing Cup
24A - Bearing Cone
25 - Crownwheel
26 - Thrust Washer
27 - Clutch Plate
28 - Friction Plate
29 - Cage Half
30 - Wheel
31 - Trunnion
32 - Pinion
51 - Split Pin
53 - End Flange
54 - Nut
55 - Stud
56 - Spring Washer
57 - Nut
62 - Shim
63 - Bearing Housing
64 - Bearing Cup
64A - Bearing Cone
65 - Setscrew
66 - Helical Gear
67 - End Nut
68 - Washer
69 - Bolt
33 - Strap
34 - Washer
35 - Nut
36 - Gasket
37 - Axle Casing
38 - Shaft Nut
39 - Lockplate
40 - Shaft Bearing
41 - Oil Seal
42 - End Cap
43 - Differential Shaft
44 - Nut
45 - Spring Washer
46 - Stud
47 - Oil Filler/Level Plug
48 - Drain Plug
49 - Breather Tube
50 - Stud
4. Jack up chassis until the tyres are clear of ground
and support with suitably placed stands or timbers.
5. Remove wheel nuts then pull off road wheels.
6. Disconnect differential shaft flange (43) from
driveline.
7. Remove front axle from vehicle and place on a
suitable axle stand. Refer to Section 180-0020, FRONT
SUSPENSION.
Note: As there is no oil sealing between the drive head
and the hubs, the oil must be drained from all three
units before overhaul.
8. Place suitable containers under the drive head and
both hubs.
9. Rotate hubs to bring bolts (6, Fig. 2) to their lowest
point. Unscrew and remove filler/level plugs (7, Fig. 2).
Remove bolts (6, Fig. 2) and washers (5, Fig. 2) to
drain the oil from the hubs.
10. Unscrew and remove oil filler/level plug (47) and
drain plug (48) to drain oil from drive head.
Driveshafts and Driveline
1. Remove bolts (4, Fig. 2) and washers (3, Fig. 2).
2. Using suitable lifting equipment, pull off planet
carrier assembly (8, Fig. 2) and place on bench, small
diameter down.