18
Rear Axle Group - Differential Drive Head
Section 160-0020
SM 1969 4-00
MAINTENANCE
Proper lubrication of the differential assembly is
essential if the differentials are to deliver the service
intended. Section 300-0020, LUBRICATION SYSTEM
gives full information on the proper lubrication intervals
and the lubricant which should be used.
SPECIAL TOOLS
The special tools referenced in this section are
available from your dealer. Refer to Section 300-0070,
SERVICE TOOLS, for part numbers of general service
tools and sealants required.
DIFFERENTIAL DIAGNOSIS
Noises and vibrations originating in the tyres,
transmission, planetaries and drivelines are easily
transmitted and may be erroneously attributed to the
differential. Therefore, all possible sources of noise
should be investigated before the differential is taken
apart.
Whenever noises such as a grating or rattle are heard
coming from the differential, stop the unit immediately.
One tooth from a gear can cause damage to all gears
and bearings. When the differential is definitely at fault,
remove the axle shafts and disconnect the driveline
before moving the vehicle.
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.
Removing the axle shafts or drivelines
will make the parking brake ineffective.
* * * *
DIAGNOSIS CHART
CONDITION REASON REMEDY
Vibration Broken gear teeth Replace damaged gear
Excessive run-out of pinion or flanged case Disassemble, correct or replace faulty
part
Continual noise Bearing worn Replace worn parts
Gears damaged or worn Replace gears
Noise on drive Ring or pinion gear adjustment tight Adjust
Noise on coast Bearings damaged Replace bearings
Loose ring and pinion gear adjustment Adjust
Excessive pinion gear end play Adjust
Noise on turns Normal limited slip differential operation Use an EP oil with limited slip
additives. Refer to Section 300-0020,
LUBRICATION SYSTEM
Worn pinion gears or side gears Replace gears
Worn or damaged axles (spiders) Replace axles (spiders)
Loss of lubricant Oil seals worn Replace seals
Loose nuts or bolts Tighten nuts or bolts to correct torque
Cracked housing/case Repair or replace housing/case
SPECIAL TORQUE SPECIFICATIONS
TORQUE
FIG. NO. ITEM NO. PART NAME Nm lbf ft
3 2 Slotted Nut 600 443
3 20 Bolt 295 218
3 25 Bolt 110 82
Courtesy of Machine.Market
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