Operation and maintenance manual

Rear Axle Group - Differential Drive Head
2
Section 160-0020
SM 2151 6-02
DESCRIPTION
The axle employs a differential drive unit, consisting of
a single reduction spiral bevel crownwheel and pinion.
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. The differential is a POWR LOK torque bias unit
which maintains traction at both wheels. The design
also ensures that both the engagement and
disengagement action of the POWR LOK unit does not
produce any shock torsional loads in the drive shafts.
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.
LEGEND FOR FIG. 1
1- Bolt
2 - Spring Washer
3 - End Cap
4 - Not fitted
5 - Not fitted
6- Axle Casing
7 - Diff Pinion
8 - Diff Wheel
9 - Diff Cage Assy
10 - Friction Plate (Sintered)
11 - Crownwheel
12 - See item 13
13 - Diff Housing Assy
comprising items 12-14,46,47
14 - See item 13
15 - Diff Wheel Thrust Washer
16 - Diff Bearing Adjusting Nut
17 - Diff Bearing Cup
17A - Diff Bearing Cone
18 - Nut
19 - Bolt
20 - Diff Trunnion
21 - Not fitted
22 - Not fitted
23 - Not fitted
24 - Pinion Bearing Housing
25 - Not fitted
26 - Spacer
27 - Spacer
28 - Washer Spacer
29 - Oil Seal
30 - End Cap
31 - Spring Washer
32 - Setscrew
33 - Coupling Flange
34 - Coupling Flange Nut
35 - Pinion Bearing Cup
35A - Pinion Bearing Cone
36 - Pinion Bearing Cup
36A - Pinion Bearing Cone
37 - Pinion
38 - Pinion Nose Bearing
39 - Shim
40 - Gear Casing
41 - Axle Casing Nut
42 - Spring Washer
43 - Stud
44 - Clutch Plate
45 - Not fitted
46 - See item 13
47 - See item 13
48 - Adjusting Nut Split Pin
49 - Gear Casing Strap
50 - Washer
51 - Nut
52 - Not fitted
53 - Axle Casing Stud
54 - Drain Plug
55 - Oil Plug (Filler)
3. Whilst road wheels are still on the ground, loosen the
wheel nuts of each wheel.
4. Jack up chassis until the tyres are clear of ground
and support with suitably placed stands or timbers.
5. Remove the wheel nuts then pull off road wheels.
6. Identify the relationship of the driveline flange to the
coupling flange (33). Disconnect driveline and secure
clear of drive head. Driveline may be removed if
convenient to do so. Refer to Section 130-0020, REAR
DRIVELINES.
7. Loosen coupling flange nut (34) but do not remove.
8. Disconnect breather tube from adaptor.
9. Remove rear axle from vehicle and place on a
suitable axle stand. Refer to Section 180-0040, REAR
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.
10. Place suitable containers under the drive head and
both hubs.
11. 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.