Operation and maintenance manual

10
SM 2147 Rev 1 10-03
Rear Axle Group - Axle Group (Hub)
Section 160-0030
300-0020, LUBRICATION SYSTEM.
With new or rebuilt units, drain (preferably after a short run
to warm the oil) and refill after 100 hours of operating, then
at intervals of 2 000 hours (12 months).
Note: When refilling centre axle, ensure that 3rd
differential unit is primed with 1 litre (1.75 pints) of oil
before filling drive head.
Oil Level Check
Check oil levels every 250 hours (monthly), following
the procedure below:
1. Drive vehicle onto 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. Unscrew differential oil filler/level plug (refer to
Sections 140-0060, 150-0020 or 160-0020,
DIFFERENTIAL DRIVE HEAD) and check that oil level
is to bottom of plug hole. Add oil if necessary.
Note: As there is no oil sealing between the drive head
and hubs (38), the hub oil levels should be the same as
the drive head i.e. 13 mm (0.5 in) above the axle centre
line. After filling, allow oil to settle for at least 15
minutes, then re-check oil level at all points. Add oil as
necessary until levels remain constant after settling
period.
4. Raise axle until both road wheels are just off the
ground then support with suitable stands or timbers.
5. Rotate each hub (38) so that bottom of oil filler/level
plugs (1) are approximately 13 mm (0.5 in) above axle
centre line (level with differential oil filler/level plug).
6. Unscrew plugs (1) and check that oil level is to
bottom of plug holes. If not, add oil to each hub (38)
through plug holes then re-check oil level in differential.
7. When level is correct, refit and tighten all oil filler/
level plugs, lower vehicle to ground and remove wheel
blocks.
SPECIAL TOOLS
Refer to Section 300-0070, SERVICE TOOLS, for part
numbers of the face seal insertion tools, plate
centralising tool, ring gear alignment tool, hub guide
sleeve and general service tools and adhesives
required. These tools and adhesives are available from
your dealer.
AXLE DIAGNOSIS
Noises originating in the tyres, transmission, brakes or
drivelines might be attributed by mistake to the axle
components, therefore, all possible sources of noise
should be investigated before deciding the axle is at
fault.
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.
True axle noises may be located by lifting or jacking
the machine up until all tyres are clear of the floor or
ground. Securely block the machine in this position.
Run power train at moderate speed. Be certain all tyres
are off the ground to prevent damage to the differential
and make sure that there is no brake drag.