SECTION 25 - FRONT AXLES 79
Excessive wearing out of input
flange spline
Exhaustive use
Pinion nut loose
Pinion axle backlash
Replace the flange.
Check that the pinion spline is not
excessively worn out.
Replace bevel gear set if required.
Fatigue failure of pinion teeth
See if the fracture line is well
defined
(wave lines, beach lines)
Exhaustive use
Continuous overload
Replace bevel gear set.
Pinion and ring teeth breakage Crash load of differential compo-
nents
Check and/or replace other differen-
tial components.
Side gear spline worn out
Replace all scratched washers
(Excessive backlash)
Excessive use Replace differential gear group.
Replace half shaft if required.
Thrust washer surface worn out
or scratched
Insufficient lubrication
Incorrect lubrication
Contaminated oil
Use correct lubrication and fill up to
right level.
Replace at intervals recommended.
Replace all scratched washers and
those with a thickness by 0.1 mm
lower than the new ones.
Inner diameter of tapered roller
bearing worn out
Excessive use
Excessive pinion axial backlash
Insufficient lubrication
Contaminated oil
Replace bearing.
Check pinion axial backlash.
Use proper lubrication, fill up to right
level and replace at recommended
intervals.
Bent or broken half shaft Vehicle intensively operated or
overloaded
Replace.
Half shaft broken at wheel side Wheel support loose
Beam body bent
Replace.
Check that wheel support is not
worn out or wrongly adjusted.
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