58 Meritor Differential Carrier 18X
7 Troubleshooting
The following chart shows the most common faults occurring to a differential unit.
Fault
1. Noise and
possible overheating
2. Anomalous knocks from the
differential during
acceleration / deceleration
stages
3. Noise when travelling
4. Oil leakages
(see also TP0838 & TP0445)
Possible causes
The oil used is not of the type specified by the
manufacturer
Low oil level
Incorrect backlash between drive gear teeth
Gears damaged
Bearings worn or maladjusted
Bearings preload
Incorrect use of retarder/exhaust brake
Driving wheel loose on hub
Differential unit splined sections worn
Prop Shaft - Flange - Splines - Bolts
Low oil level in axle housing
Gear teeth and/or bearings worn or damaged
Bearings preload maladjusted or damaged
Excessively high oil level in axle housing
Breather blocked
Contaminant in oil
Seal rings damaged
Screws/nuts loose
Seal between axle housing and differential unit
is damaged
Remedy
Drain oil from housing and fill with new oil of the
specified type
Top up oil level in housing
Remove bevel drive gear pair. Trace cause for
possible gear damage. Adjust as required
Replace defective components
Replace defective components
Adjust or replace damaged bearing.
Check retarder/exhaust brake efficiency and
setting. Look for possible damage to bevel drive
gear set and bearings
Check wheel nuts at regular intervals and tighten,
as required
Replace worn components
Checks
Top up oil level
Replace damaged components
Adjust bearings preload and replace as required
Check oil level
Clear/replace breather
Check oil PPM limits
Replace damaged seal rings
Clean threads, coat with sealant if necessary, and
tighten to the specified torque
Remove differential unit, check and clean all
sealing surfaces and coat parts concerned with
sealant, as required
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