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MANUAL TRANSMISSION 7B1-53
Torque Specifications (Cont'd)
RTW47BLF000601
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7B1-54 MANUAL TRANSMISSION
TROUBLESHOOTING
1. ABNORMAL NOISE
1) NOISY IN NEUTRAL
Checkpoint Trouble Cause Countermeasure
Replenish or replace the gear
oilInsufficient or improper gear
oil NG
Mainshaft splines
Synchronizer clutch hub
splinesReplace the main shaft and
the synchronizer clutch hub
Replace the gear(s)
Replace the flywheel pilot
Worn splines
Worn or scuffed gear tooth
contact surfaces
Flywheel pilot bearingWorn flywheel pilot bearing
Bearings (Mainshaft,
countershaft, and transfer
shaft)
Gears (Mainshaft,
countershaft, reverse idler
gear and transfer gears)
Replace the bearing(s)Worn or broken bearing(s)
OK
NG NG NG NG OK
OK
OK
Gear oil
TransmissionRealign the transmissionTransmission misalignment OK
NG
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MANUAL TRANSMISSION 7B1-55
2) NOISY OPERATION
Checkpoint Trouble Cause Countermeasure
Replenish or replace the gear
oilInsufficient or improper engine
oil NG
Replace the gear(s)
Replace the gear(s)
Replace the bearing(s)
Gears (Gear whining)Lack of backlash between
meshing gears
Free running gears seizing on
the thrust face or the inner
face
Bearings (Hissing, thumping
or bumping)Worn or broken bearing(s)
Gears (Squealing at high
speeds)
Replace the gear(s)Gears (Growling, humming, or
grinding)Worn, chipped, or cracked
gear(s)
NG NG NG NG OK
OK
OK OK
Gear oil (Metallic rattling)
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7B1-56 MANUAL TRANSMISSION
2. HARD SHIFTING
Checkpoint Trouble Cause Countermeasure
Change lever play
Clutch pedal free play
Repair or replace the
applicable parts and regrease
Readjust the clutch pedal free
play
Worn change lever sliding
portions
Improper clutch pedal free
play
Change lever operationRepair or regrease the change
lever assembly
Replenish or replace the
engine oil
Hard operating change lever
caused insufficient grease
Insufficient or improper gear
oil
OK
OKNG NG NG NG
OK OKGear oil
Continued on the next page
Shift rod and quadrant box
sliding faces, and other partsReplace the shidt rod and/or
the quadrant boxWorn shift rod and/or sliding
faces
Repair or replace the sleeveSleeve movement failure
NG NG
OKShift block sleeve movement
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MANUAL TRANSMISSION 7B1-57
Checkpoint Trouble Cause Countermeasure
Synchronizer assembly
Shift arm and synchronizer
sleeve
Replace the worn parts
Replace the worn parts
Worn synchronizer parts
Worn shift arm and/or
synchronizer sleeve groove
Mainshaft and countershaft
thrust playReplace the worn partsWorn thrust washer, collar,
and/or gear thrust faces
OK
NG NG NG
OK OK
Continued from the previous
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7B1-58 MANUAL TRANSMISSION
3. WALKING OR JUMPING OUT OF GEAR
Checkpoint Trouble Cause Countermeasure
Shift rod and quadrant box
sliding faces
Detent ball
Replace the shift rod and/or
the quadrant box
Replace the detent ball
Worn shift rod and/or sliding
faces
Worn detent ball
Detent springRepair or replace the detent
spring
Replace the worn parts
Detent spring weak or broken
Insufficient stroke caused by
sliding position wear and
excessive play
OK
OKNG NG NG NG
OK OK
Change lever play
Continued on the next page
Mainshaft and countershaft
thrust playReplace the worn partsWorn thrust washer, collar,
and/or gear thrust faces
Replace the worn partsWorn shift arm and/or
synchronizer sleeve groove
NG NG
OKShift arm and synchronizer
sleeve
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MANUAL TRANSMISSION 7B1-59
Checkpoint Trouble Cause Countermeasure
Synchronizer assembly
Bearings (Mainshaft,
countershaft, and individual
gears)
Replace the spring
Replace the bearing(s)
Weak or broken spring
Worn or broken bearings(s)
Mainshaft splines
Synchronizer clutch hub
splinesReplace the main shaft and
the synchronizer clutch hubWorn splines
OK
NG NG NG
OK OK
Continued from the previous page
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7B1-60 MANUAL TRANSMISSION
4. OIL LEAKAGE
Checkpoint Trouble Cause Countermeasure
Gear oilReplace the gear oilImproper gear oil
Drain plug and/or filler plugTighten the plug(s) and
replenish the oil
Drain the oil to the correct
level
Loose plug(s)
Oil level too high
OKNG NG NG
OK OKOil level
Rear cover oil seal
Air breather
Replace the oil seal
Install the air breather
Replace the air breather
Worn or scratched oil seal
Air breather not installed
Air breather clogged
Front cover oil sealReplace the oil seal
Replace the gasket(s)
Worn or scratched oil seal
Defective or improperly
installed gasket(s)
OK
NG NG NG NG
OK OKGaskets