Isuzu N-Series. Manual — part 823
7B-62 MANUAL TRANSMISSION (MSB)
Unit Repair
Legend
1. Spring pin
13. Thrust collar
2. Idle gear shaft
14. Front bearing
3. Idle gear
15. Upper cover
4. Needle bearing
16. Plug
5. Lock nut and washer
17. Detent spring
6. Coupling driver
18. Detent pin
7. Front cover
19. Spring pin
8. Rear cover with oil seal
20. Shift rod plug
9. Output shaft
21. Shift rod
10. Rear bearing
22. Shift arm
11. Sleeve
23. Shift rod oil seal
12. Output gear with bushing
24. Gear case
N7A0185E
MANUAL TRANSMISSION (MSB) 7B-63
Disassembly
1. Spring Pin
• Tap the spring pin into the idle shaft.
Spring Pin Remover: 9-8529-2201-0
2. Idle Gear Shaft
• Drive out the idle gear shaft by tapping on its
front end with a suitable bar and hammer.
• Remove the spring pin from the idle gear shaft.
Spring Pin Remover: 9-8529-2201-0
3. Idle Gear
4. Needle Bearing
5. Lock Nut and Washer
• Attach a backing plate to the vice, secure the
coupling driver, and remove the lock nut, spring
washer and plain washer.
6. Coupling Driver
7. Front Cover
8. Rear Cover (with Oil Seal)
• Remove the oil seal from the rear cover.
9. Output Shaft
10. Rear Bearing
• Drive out the output shaft by tapping on its front
end with a suitable bar and hammer.
• Remove the rear bearing from the output shaft.
11. Sleeve
12. Output Gear with Bushing
13. Thrust Collar
14. Front Bearing
15. Upper Cover
N7A0186E
N7A0187E
N7A0188E
N7A0189E
7B-64 MANUAL TRANSMISSION (MSB)
16. Plug
17. Detent Spring
18. Detent Pin
19. Spring Pin
Spring Pin Remover: 9-8529-2201-0
20. Shift Rod Plug
21. Shift Rod
22. Shift Arm
• Move the shift rod (1) rearward by tapping on its
front end. Then, remove the each parts.
23. Shift Rod Oil Seal
24. Gear Case
Inspection and Repair
Make the necessary adjustments, repairs and part re-
placement if excessive wear or damage is discovered
during inspection.
Bearings
Check the each bearing, and replace in either of the fol-
lowing cases.
• Rotation is not smooth.
• Abnormal sound is generated.
N7A0190E
N7A0191E
Legend
1. Spring pin
N7A0192E
N7A0193E
MANUAL TRANSMISSION (MSB) 7B-65
• There is extreme damage or rust.
• Rolling element or rolling contact surface of needle
roller bearing is discolored, extremely worn or pit-
ted.
Gears
Check each gear for the following points. Correct a slight
stepped wear or surface roughness with an oil stone or
pencil grinder, or replace the gear if unrecoverable dam-
age is found.
• Break or damage of tooth.
• Extreme wear of tooth.
Idle Gear Shaft and Output Shaft
Check the shaft external surface for any damage or
wear, and its spline section for wear, damage or bent.
When there is any abnormal condition, or when it is used
excessively beyond a proper use limit, replace it with
new one.
Shift Mechanism
Inspect all disassembled parts for wear, damage or oth-
er abnormal conditions.
• Check the shift rod for wear, bent and damage.
• Check the shift arm for wear or deformation.
• Check the detent spring and detent pin for wear,
weakening and deformation.
• The wear of the shift rod, and the awkward opera-
tion of the gear case.
Sleeve
Check the sleeve for any abnormal conditions.
Correct a slight stepped wear or surface roughness with
an oil stone or pencil grinder, or replace the sleeve if un-
recoverable damage is found.
Ball Bearing Run-out
mm (in)
Limit
0.2 (0.01)
Output Shaft and Output Gear Bushing
Clearance
mm (in)
Limit
0.2 (0.01)
N7A0194E
Shift Arm Thickness
mm (in)
Standard
Limit
9.0 (0.35)
8.0 (0.31)
N7A0195E
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