Operation and maintenance manual

2
SM 2147 Rev 1 10-03
Rear Axle Group - Axle Group (Hub)
Section 160-0030
DESCRIPTION
Numbers in parentheses refer to Fig. 1.
The hub gears are driven by a floating sun gear (9)
which is splined to driveshaft (24). Sun gear (9) mates
with three planet gears (5) mounted in planet carrier
(19) which is bolted to hub (38). The ring gear unit (12
& 13) is of the two piece variety and is splined to axle
stub (29), it also serves to support outer bearing (10).
The brake assembly (40) consists of enclosed oil
cooled, friction plates splined to hub rotor and fixed
housing. Brake assembly (40) is mounted on the back
of hub (38). Hub (38) is fully floating, running on taper
roller bearings (10 & 27) which are secured and
adjusted by a special hub nut (14) with lock ring (15)
and spring ring (16) arrangement. The whole unit is
carried on demountable axle stub (29) bolted to axle
housing (41).
REMOVAL AND DISASSEMBLY
Numbers in parentheses refer to Figs. 1 - 7.
Note: On dismantling, clean all parts in paraffin or other
suitable cleaning agent and place on a clean work
surface.
WARNINGS
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.
When necessary to drive out components
during disassembly, be sure to use a soft drift
to prevent property damage and personal injury
from flying chips.
Draining the Oil
1. Before attempting to remove the road wheels,
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.
WARNING
To prevent personal injury and property
damage, the procedure for removing tyre and
rim assembly described in Section 160-0050,
WHEEL RIM AND TYRE must be strictly
followed.
2. Block all road wheels and turn the battery master
switch to the 'Off' position.
3. Whilst road wheels are still on the ground, loosen
wheel nuts (25) of each wheel.
4. Jack up axle and support with suitably placed
stands or timbers.
5. Support tyre and rim assembly with sling and attach
lifting device.
6. Remove wheel nuts (25) and, using lifting device,
remove tyre and rim assembly from wheel and lift clear
of machine.
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.
7. Place suitable containers under drive head and hubs
(38).
8. Unscrew differential oil filler/level plug and drain bolt
to drain oil from the drive head. Refer to Sections 140-
0060, 150-0020 or 160-0020, DIFFERENTIAL DRIVE
HEAD.
9. Rotate hubs (38) to bring bolts (21) to their lowest
point.
10. Unscrew and remove oil filler/level plugs (1).
11. Unscrew and remove bolts (21) and washers (20) to
drain oil from hubs (38).
12. When oil is completely drained, remove drip tray,
and support hub (38) adequately with solid timber
blocks.
13. Replace bolts (21), washers (20) and oil filler/level
plugs (1).
14. Replace differential drain bolt and oil filler/level plug.
15. Remove brake cooling and actuation lines from brake
assembly (40). Refer to Section 165-0010, BRAKE PARTS.
Cap open lines to prevent ingress of dirt.
16. Remove drain plug from brake assembly (40) and
allow oil to drain into a suitable container. Refer to Section
165-0010, BRAKE PARTS.