TM 5-3810-300-24 & P2
TRANSMISSION TROUBLESHOOTING
TROUBLE
PROBABLE CAUSE
REMEDY
position. Connect U-
joints and tighten
set screws.
Noise (from other
Fan bent or out of balance
Replace fan.
sources)
Damaged vibration damper
Replace damper.
Crankshaft out of balance
Check balance. Replace
crankshaft if neces-
sary.
Flywheel out of balance
Check balance. Re-
place flywheel if nec-
essary.
Unbalanced clutch assembly
Check clutch and clutch
housing for proper
alignment.
Loose engine mountings
Tighten mountings.
Worn universal joints
Replace universal
joints.
Sprung driveshaft
Replace driveshaft.
Noisy transmission
Transmission misaligned
Align engine and trans-
(in neutral)
mission (assembled)
with rear axle so as
to correct angles of
universal joints.
Worn transmission pinion
Replace bearing.
bearing.
Worn or scored countershaft
Replace bearings.
Damaged second speed mainshaft
Replace bushing.
gear bushing.
Unmatched gears.
Replace unmatched
gears.
Worn or rough reverse-idler
Replace gear.
gear.
Eccentric countershaft gear
Replace gear.
assembly.
Sprung or worn countershaft.
Replace countershaft.
Excessive backlash in gears.
Replace worn gears.
Excessive end play in counter-
Adjust to reduce end play.
shaft, reverse-idler pinion.
Worn mainshaft pilot bearing.
Replace pilot bearing.
Scuffed gear tooth contact sur-
Replace gear.
face.
Insufficient lubrication.
Check for leaks; fill
to proper level.
4-101