Defender 90 NAS. Manual — part 45
47
PROPELLER SHAFTS
2
REPAIR
18. Press each cup into its respective yoke up to
lower land of circlip grooves. Damage may be
caused to cups and seals if cups pass this point.
19. Fit circlips and check no end float exists.
20. Engage spider in yokes of sliding member. Fit
bearing cups and circlips as described in
instructions 14 to 19.
21. Fit grease nipples to spider and sliding member.
22. Apply instructions 14 to 19 to opposite end of
propeller shaft.
23. Fit grease nipple and lubricate.
Refit
24. Fit propeller shafts to vehicle and tighten nuts to
47Nm, 35 lbf ft
Refit propeller shaft so sliding joint end of shaft
is fitted to transfer gearbox.
PROPELLER SHAFTS
1
SPECIFICATIONS, TORQUE
TORQUE VALUES
Nm
lbf ft
Propeller shaft flange nuts
47
. . . . . . . . . . . ...
35
REAR AXLE AND FINAL DRIVE
1
DESCRIPTION AND OPERATION
DESCRIPTION
The welded steel rear axle casing houses a separate
spiral bevel type differential unit, which is off set to the
right of the vehicle centre line. The differential unit
drives the rear wheels via the axle shafts and fully
floating hubs which are mounted on tapered roller
bearings.
Lubrication
The differential is lubricated with oil and the hub
bearings with grease. The hub bearings are fitted with
inner and outer seals. The outer seals prevent the
differential oil mixing with the hub grease and the
inner seals prevent dirt ingress into the hub.
Ventilation
Ventilation of the hub bearings is through the outer oil
seals and the differential ventilation pipe, which
terminates at a high level.
Rear axle hub
1. Axle casing
2. Ventilation pipe
3. Axle shaft
4. Wheel studs and hub
5. Wheel bearing stub axle
6. Wheel bearings (2)
7. Inner hub seal
8. Outer hub/axle shaft seal
9. Hub lock plate, thrust washer and nuts (2)
10. Brake disc
11. Sensing ring - road speed
REAR AXLE AND FINAL DRIVE
1
FAULT DIAGNOSIS
FAULT DIAGNOSIS
Complaint - Oil leaks
An external leak of lubricant from the hub seals can
be caused by a faulty internal seal. For example, if the
seals which separate the differential from the hubs are
faulty and the vehicle is operating or parked on an
embankment, oil from the differential may flood one
hub resulting in a lack of lubrication in the differential.
When a seal is found to be leaking check the axle
ventilation system, as a blockage can cause internal
pressure to force oil past the seals.
See ’Description and Operation’for an illustration of
oil seal locations.
When investigating hub seal leaks, check the grease
for dilution with oil. Also check the differential oil level,
for signs of metal particles in the oil and the condition
of internal seals.
If the vehicle is driven in deep water with defective oil
seals, water may contaminate the lubricants and raise
the differential oil level, giving a false impression that
the housing has been overfilled. Do not assume that
a high oil level in the differential is due to over
filling or, that a low level is because of an external
leak.
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