Isuzu KB P190. Service manual — part 1180
Manual Transmission (MUX) 7B1-1
TRANSMISSION/TRANSAXLE
Manual Transmission
(MUX)
TABLE OF CONTENTS
General Description . . . . . . . . . . . . . . . . . . . . . . 7B1-2
Transmission Assembly . . . . . . . . . . . . . . . . . . . 7B1-8
Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . 7B1-16
Front Case Assembly . . . . . . . . . . . . . . . . . . . . 7B1-34
Rear Case Assembly . . . . . . . . . . . . . . . . . . . . 7B1-36
End Cover Assembly. . . . . . . . . . . . . . . . . . . . . 7B1-39
Input Shaft Assembly . . . . . . . . . . . . . . . . . . . . 7B1-40
Counter Shaft Assembly . . . . . . . . . . . . . . . . . . 7B1-43
Output Shaft Assembly . . . . . . . . . . . . . . . . . . . 7B1-50
Shift & Select Rod Assembly . . . . . . . . . . . . . . 7B1-51
Intermediate Plate Assembly . . . . . . . . . . . . . . 7B1-53
Control Rod Assembly . . . . . . . . . . . . . . . . . . . 7B1-55
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . 7B1-55
5th-Reverse Shift Block Assembly . . . . . . . . . . 7B1-56
3rd-4th Shift Arm Assembly. . . . . . . . . . . . . . . . 7B1-57
Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . 7B1-58
Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . 7B1-58
7B1-2 Manual Transmission (MUX)
General Description
General Description
MUX5S Transmission(4x2 model)
RTW77BMF000701
Manual Transmission (MUX) 7B1-3
MUX5S Transmission(4x4 model)
The MUX5S is a constant mesh transmission,
synchronized in all speeds.
The transmission is designed for a reduction of the shift
effort and the quietest possible operation.
Principle parts of the transmission are the clutch
housing, the front case, the intermediate plate, the rear
case, the end cover, and the gears.
The transmission control box is built into the
transmission.
RTW77BMF000601
7B1-4 Manual Transmission (MUX)
Troubleshooting
Condition
Possible Cause
Correction
Abnormal Noise (Noisy in Neutral)
Insufficient or improper lubricant
Replenish or replace lubricant
Flywheel pilot bearing worn or
broken
Replace flywheel pilot bearing
Bearing(s) worn or broken (Input
shaft, counter shaft, and output
shaft)
Replace bearing(s)
Gear tooth contact surfaces worn or
scuffed (Input shaft, counter shaft,
output shaft, and reverse idler gear)
Replace gear(s)
Spline worn (Input shaft, output
shaft, counter shaft, and
synchronizer clutch hub)
Replace worn parts
Transmission misalignment
Realign transmission
Abnormal Noise (Noisy Operation)
Insufficient or improper lubricant
(Metallic rattling)
Replenish or replace lubricant
Bearing(s) worn or broken (Hissing,
thumping, or bumping)
Replace bearing(s)
Gear(s) worn, chipped, or cracked
(Growling, humming, or grinding)
Replace gear(s)
Gears seizing on thrust face or
inner face free running (Squealing
at high speeds)
Replace gear(s)
Gears lack of backlash between
meshing (Gear whining)
Replace gear(s)
Hard Shifting
Insufficient or improper lubricant
Replenish or replace lubricant
Improper clutch pedal free play
Readjust clutch pedal free play
Hard operating of change lever
caused insufficient grease
Repair or regrease change lever
assembly
Change lever sliding portions worn
Repair or replace applicable parts
and regrease
Shift block sleeve movement failure
Repair or replace sleeve
Shift rod and/or quadrant box
sliding face worn
Replace worn parts
Shift arm and/or synchronizer
sleeve groove worn
Replace worn parts
Collar, and/or gear thrust faces
worn (Input shaft and counter shaft
thrust play)
Replace worn parts
Synchronizer parts worn
Replace worn parts
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