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Grove
Published 01-14-2021 Control # 707-01
7-35
TMS9000-2 SERVICE MANUAL
POWER TRAIN
7
bushings and sleeves as gears float between mating gears
on the countershafts.
Maintenance
Troubleshooting
Before attempting to determine a cause of transmission
noise or trouble, note what position the gearshift lever is in
when the trouble occurs. If the noise is evident in only one
gear position, the cause of the trouble is generally traceable
to the gears in operation. There are times, however, due to
abnormal conditions in other parts of the crane, when noises
are transmitted from the engine, power train, frame, or body
to the transmission and will appear to originate there. All
such sources should be checked out before removing and
disassembling the transmission.
Another source of trouble could be a faulty air system or in
the actuating parts of the shifting bar housing. This will be
noticed when the transmission fails to make a range shift, or
shifts too slowly.
SYMPTON
PROBABLE CAUSE
SOLUTION
Noise (from other sources).
Fan bent or out of balance.
Replace fan.
Damaged vibration damper.
Replace damper.
Flywheel out of balance.
Check balance. Replace flywheel if
necessary.
Unbalanced clutch assembly.
Check clutch and clutch housing for proper
alignment.
Loose engine mountings.
Tighten mountings.
Worn U-joints.
Replace U-joints.
Noisy transmission (in
neutral).
Transmission misaligned.
Align engine and transmission (assembled)
with rear axle so as to correct angles of U-
joints.
Worn transmission pinion bearing.
Replace bearing.
Worn or scored countershaft bearing.
Replace bearings.
Damaged second speed mainshaft gear
bushing.
Replace bushing.
Unmatched gears.
Replace unmatched gears.
Worn or rough reverse-idler gear.
Replace gear.
Eccentric countershaft gear assembly.
Replace gear.
Sprung or worn countershaft.
Replace countershaft.
Excessive backlash in gears.
Replace worn gears.
Excessive end play in countershaft.
Adjust to reduce end play.
Worn main shaft pilot bearing.
Replace pilot bearing.
Scuffed gear tooth contact surface.
Replace gear.
Insufficient lubrication.
Check for leaks; fill to proper level.
Sticking in gear.
Clutch operating improperly.
Adjust clutch. Check alignment.
Sliding gear tight on main shaft splines.
Check for galling. Replace as necessary.
Improper adjustment of linkage
Adjust linkage.
Fo
r
Reference
Only