Specifications

Power Train Testing and Adjusting 41
6. Too much or too little gear backlash.
7. Loose or worn pinion bearings.
8. Loose or worn shaft bearings.
9. Loose or worn differential bearings.
Problem: Noise at different intervals.
Probable cause:
1. Bolts on drive gear not tightened correctly.
2. Drive gear has a defect (warped).
3. Loose or broken differential bearings.
4. Bevel gear bearing failure.
Problem: Noise on turns only
Probable cause:
1. Differential pinion gears too tight on the spider or
the pinion shaft.
2. Side gears tight in differential case.
3. Differential pinion or side gears have a defect.
4. Thrust washers worn or have damage.
5. Too much clearance (backlash) between side gears
and pinion.
6. Worn axle shaft assembly gear.
7. Hub gear worn.
8. Wheel bearings worn or out of adjustment.
Problem: Leakage of lubricant.
Probable cause:
1. Loss through hub seals.
a. Lubricant above specification level.
b. Wrong kind of lubricant.
c. Restriction of axle housing breather.
d. Hub oil seal installed wrong or has damage.
2. Loss at bevel input pinion shaft.
a. Lubricant above specification level.
b. Wrong kind of lubricant.
c. Restriction of axle housing breather.
d. Pinion oil seal worn or not installed correctly.
Problem: Drive wheels do not turn.
Probable cause:
1. Broken axle shaft.
a. Loose wheel bearings.
b. Axle shaft too short.
2. Side gear or differential pinion broken.
3. Differential pinion shaft or spider broken.
Check List from Pressure Test
Problem: Low pressure to FORWARD and
REVERSE clutches.
Probable cause:
1. Inching valve linkage adjustment is not correct.
2. Inching valve reducing spool stuck open.
3. Clutch piston seals cause leakages.
4. Main relief valve setting too low caused by a
defective relief valve spring.
5. Low oil pressure. See Probable Cause for Low Oil
Pressure.
6. External oil lines are not connected correctly.
7. Modulating valve assembly stuck.
Problem: Clutch pressure and pump pressure are
high.
Probable cause:
1. Main relief valve is stuck.
2. A restriction in the hydraulic circuit.
3. Main relief valve not adjusted properly.