Isuzu N-Series. Manual — part 876
7B1-28 MANUAL TRANSMISSION (MZZ)
85. Align the lip portion of the lock nut with the V-
groove at the end of the shaft (length (B) must be
at least 5 mm (0.2 in)). Wedge the lipped portion of
the nut into the V-groove so that the gap between
the nut and the bottom of the V-groove (A) is less
than 2.5 mm (0.1 in).
86. Caulk the lock nut at two places (caulking form: tip
radius approximately 1 mm with caulking sites 60
degrees away form each other).
87. Install the parking brake drum.
• Refer to PARKING BRAKES.
88. Install the shift block together with the release
bearing, the clutch shaft, and the shift fork.
• Refer to CLUTCH.
MIN
5.0mm
MIN
5.0mm
MAX
2.5mm
MAX
2.5mm
A
B
N7A0297E
MANUAL TRANSMISSION (MZZ) 7B1-29
Top Gear Shaft
Parts
Disassembly
1. Remove the block ring from the top gear shaft.
2. Remove the needle bearing from the top gear
shaft.
Notice:
The needle bearing is of a separator type. Be careful not
to drop the roller when dissembling.
3. Use a pair of snap ring pliers to remove the snap
ring from the top gear shaft.
4. Use a press and a bearing remover to remove the
bearing from the top gear shaft.
5. Inspect each of the disassembled parts for wear
and damage. If wear or damage is present, make
the necessary repairs or replace the part(s).
6. Inspect the gear teeth, the spline, and the end con-
tact surfaces for wear and damage. If wear or dam-
age is present, the part(s) must be replaced.
7. Inspect each of the bearings. The bearings must
rotate smoothly and quietly. There must be no cor-
rosion. Play in the thrust direction must be normal.
Replace the bearing(s) if these conditions are not
met.
Legend
1. Snap ring
4. Needle bearing
2. Bearing
5. Block ring
3. Top gear shaft
1
2
3
4
5
N7A0367E
N7A0368E
7B1-30 MANUAL TRANSMISSION (MZZ)
8. Inspect the needle bearing rolling surface and roll-
er for discoloration, excessive wear, and pitching.
Replace the bearing if any of these conditions are
present.
Reassembly
1. Use the installer (5-8840-2345-0) and a press to in-
stall the bearing to the top gear shaft.
2. Use a pair of snap ring pliers to install the snap ring
to the top gear shaft.
3. Install the needle bearing to the top gear shaft.
4. Thoroughly apply 5W-30 engine oil to the inner sur-
face of the block ring, then attach the block ring to
the upper gear shaft.
N7A1193E
MANUAL TRANSMISSION (MZZ) 7B1-31
Main Shaft
Parts
Legend
1. Snap ring
18. 3rd gear inside ring
2. 4th / 5th clutch hub assembly and sleeve
19. Main shaft
3. 4th block ring
20. Needle bearing
4. 4th gear
21. 1st gear
5. Needle bearing
22. 1st gear inside ring
6. Snap ring
23. 1st gear outside ring
7. Collar
24. 1st gear block ring
8. Needle bearing
25. 6th gear
9. 3rd gear
26. Bearing
10. Needle bearing
27. Spacer
11. 2nd gear
28. Collar
12. 2nd gear inside ring
29. Needle bearing
13. 2nd gear outside ring
30. Reverse gear
14. 2nd gear block ring
31. Reverse gear inside ring
15. 2nd / 3rd clutch hub assembly and sleeve
32. Reverse gear outside ring
N7A0536E
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