Isuzu Trooper 1999 Workshop Manual page 1542

Diagnosis
Condition
Abnormal noise
Hard Shifting
Walking or Jumping out of gear
Oil leakage
Possible cause
Flywheel pilot bearing worn
Bearings worn or broken (Mainshaft,
counter shaft, and transfer shaft)
Gear tooth contact surfaces worn or
scuffed (Mainshaft, counter shaft,
reverse idler gear and transfer gears)
Splines worn (Mainshaft,
synchronizer clutch hub)
Gear or bearing thrust face seized
Lack of backlash between meshing
gears
Improper clutch pedal free play
Change lever sliding portions worn
Shift block, shift rod and/or control
box sliding faces worn
Shift arm and synchronizer sleeve
groove worn
Thrust washer, collar, and/or gear
thrust faces worn (Mainshaft and
counter shaft thrust play)
Synchronizer parts worn
Detent ball worn
Detent spring weakened or broken
Shift rod and/or control box sliding
faces worn
Shift arm and synchronizer sleeve
groove worn
Thrust washer, collar, and/or gear
thrust faces worn (Mainshaft and
counter shaft thrust play)
Bearings worn or broken
Splines worn (Mainshaft,
synchronizer hub)
Synchronizer spring weakened or
broken
Loose drain plug(s) and/or filler
plug(s)
Defective or improperly installed
gasket(s)
Oil seal worn or scratched
MANUAL TRANSMISSION
Correction
Replace
Replace
Replace
Replace
Replace
Replace
Readjust
Repair or replace
Regrease
Replace
Replace worn parts
Replace worn parts
Replace
Replace
Replace
Replace
Replace worn parts
Replace worn parts
Replace
Replace
Replace
Tighten
Replenish oil
Replace
Replace
7B–3