Case 570T Operator's Manual page 200

Problem
Vibrations during travel
Break towards the outer
end of the ring gear tooth
Break towards the inner
end of the ring gear tooth
Worn-out or scored Pinion
teeth and ring gear teeth
Overheated ring gear
teeth or pinion teeth.
Check if gear teeth have
faded
Pitted drive pinion teeth
Bent axle beam body
Worn-out or pitted
bearings
Gaskets leak oil
Excessive wear of input
flange spline
Fatigue break of pinion
gear tooth. Check if the
fracture line is wavy or
clearly delineated (stop
line)
Break of pinion teeth and
ring gear teeth
Splines of planetary
gear worn-out (excessive
backlash)
8 - TROUBLESHOOTING
Possible Cause
Incorrect installation
Defective axle
Wrong weight distribution
Bent or broken axle shaft
Excessive gear load compared to the pre-
scribed one
Incorrect gear adjustment (excessive back-
lash). Loose pinion nut
Load crash
Incorrect gear adjustment (insufficient
backlash). Loose pinion nut
Insufficient lubrication
Contaminated lubricant. Incorrect lubricant
or poor additives
Worn-out pinion bearings that cause an
incorrect pinion axial backlash and wrong
contact between pinion and ring gear
Prolonged operation at high temperature
Unsuitable lubricant. Low oil level. Con-
taminated lubricant
Extremely intense use
Insufficient lubrication
Overloaded vehicle.
Load crash
Insufficient lubrication
Contaminated lubricant. Extremely intense
use. Normal wear. Loose pinion nut
Prolonged operation at excessive oil tem-
perature
Oil gasket wrongly installed. Gasket edge
cut or scored. Contaminated lubricant
Intense use
Loose pinion nut
Axial backlash of pinion
Intense use. Continuous overload
Crash load of differential components
Intense use
Correct the installation
Inspect and repair
Distribute the weight differently
Replace the axle beam
Replace the bevel gear
Carefully follow the recommended adjust-
ment operations for ring gear and pinion
backlash and for tooth mark detection
Replace the bevel gear
Carefully follow the recommended adjust-
ment operations for ring gear and pinion
backlash and for tooth mark detection
Replace the bevel gear
Replace the pinion bearings, paying atten-
tion to correctly position the ring gear, the
pinion and the bearing preloading
Use proper lubricant, fill up to the correct
level and change at recommended inter-
vals
Replace the bevel gear
Use proper lubricant, fill up to the correct
level and change at recommended inter-
vals
Replace the bevel gear
Use proper lubricant, fill up to the correct
level and change at recommended inter-
vals
Replace the axle beam body
Vehicle's accident.
Replace bearings
Use proper lubricant, fill up to the correct
level and change at recommended inter-
vals
Replace the gasket and matching surface
if damaged
Use proper lubricant, fill up to the correct
level and change at recommended inter-
vals
Replace the flange
Check that the pinion spline is not exces-
sively worn out
Replace the bevel gear, if necessary
Replace the bevel gear
Check and/or replace other differential
components
Replace differential gear assy. Replace the
axle beam, if necessary
8-8
Correction