Isuzu N-Series. Manual — part 835
MANUAL TRANSMISSION 7B-1
MANUAL TRANSMISSION AND CLUTCH
MYY SERIES
SECTION 7B
MANUAL TRANSMISSION
Contents
MANUAL TRANSMISSION MECHANISM. . . 7B-2
Function and Operation . . . . . . . . . . 7B-2
Inspection . . . . . . . . . . . . . . .. 7B-3
ON-VEHICLE SERVICE . . . . . . . . . ... 7B-7
7B-2 MANUAL TRANSMISSION
MANUAL TRANSMISSION MECHANISM
Function and Operation
• 5MT
N7A0275E
MANUAL TRANSMISSION 7B-3
• 6MT
MYY transmission is designed to enable weight saving
and to adapt larger available torque input 392 N
⋅m (40
kg
⋅m/289.3 lb⋅ft). New technology is adopted such as
aluminum-tube type case (3 piece) structure, tapered
roller bearing (main shaft front and rear, counter shaft
front and rear) and twin-rod type shift control layout.
Inspection
Diagnostic chart for troubleshooting
N7A0276E
Trouble
Cause
Treatment
Noise
Wear of flywheel pilot bearing
Replace
Wear or damage of bearing (main shaft, counter
shaft)
Replace
Wear, crack and damage of gear (main shaft,
counter shaft, reverse idle gear)
Replace
Wear of spline (main shaft, synchronizer clutch hub)
Replace
Seizure of gear or bearing thrust surface
Replace
Backlash shortage of mesh gear
Replace
Shift difficulty
Clutch pedal play inaccuracy
Adjust
Wear of change lever sliding portion
Repair or replace, lubricate
grease
Wear of shift block, shift rod or control box sliding
portion
Replace
Wear of shift arm or synchronizer sleeve groove
Replace the worn parts
Wear of thrust washer, collar or gear thrust surface
(main shaft and counter shaft thrust play)
Replace the worn parts
Wear of synchronizer parts
Replace
7B-4 MANUAL TRANSMISSION
Oil Inspection
1. Remove the filler plug.
2. Check the oil level by inserting a finger to the filler
plug hole.
3. Refill oil when the oil level is out of the specified
amount.
• Applicable oil = Besco gear oil transaxle (5W-
30)
4. Fix the filler plug to the specified torque.
Tighten:
Filler plug to 39 N
⋅m (4.0 kg⋅m / 29 lb⋅ft)
• 5MT
• 6MT
Oil Replacement
1. Start the engine and idle the transmission suffi-
ciently.
2. Stop the engine, remove the drain plug, and then
drain oil.
3. Fix the drain plug.
Tighten:
Drain plug to 39 N
⋅m (4.0 kg⋅m / 29 lb⋅ft)
4. Remove the filler plug.
5. Fill oil through the filler plug hole to the lower edge
of the hole.
• Applicable oil = Besco gear oil transaxle (5W-
30)
Out of gear
Wear of detent ball
Replace
Wear of shift rod or control box sliding portion
Replace
Wear of shift arm or synchronizer sleeve groove
Replace the worn parts
Wear of thrust washer, collar or gear thrust surface
(main shaft and counter shaft thrust play)
Replace the worn parts
Wear or damage of bearing
Replace
Wear of spline (main shaft, synchronizer hub)
Replace
Fatigue or damage of synchronizer spring
Replace
Oil leakage
Looseness of drain plug or filler plug
Tighten the plug or refill oil
Damaged gasket
Replace
Wear or damage of oil seal
Replace
Trouble
Cause
Treatment
N7A1005E
Legend
1. Filler plug
2. Drain plug
N7A1006E
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