Isuzu N-Series. Service manual — part 872
7B1-12 MANUAL TRANSMISSION (MZZ)
9. 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).
10. Caulk the lock nut at two places.
11. Install the parking brake drum.
• Refer to PARKING BRAKES.
12. Install the parking brake cable.
• Refer to PARKING BRAKES.
13. Install the rear propeller shaft assembly.
• Refer to PROPELLER SHAFT.
MIN
5.0mm
MIN
5.0mm
MAX
2.5mm
MAX
2.5mm
A
B
N7A0297E
MANUAL TRANSMISSION (MZZ) 7B1-13
Transmission
Parts
N7A0527E
7B1-14 MANUAL TRANSMISSION (MZZ)
Legend
1. Clutch housing
22. Counter rear bearing
2. Bush (Clutch housing)
23. Detent assembly
3. 4th / 5th, 6th shift arm
24. Reverse gear idle cover
4. Interlock plate
25. PTO cover
5. Control box
26. Sensor dummy plug
6. Reverse switch
27. Transmission case
7. Detent assembly
28. Detent assembly
8. Filler plug
29. 1st / reverse and 2nd/ 3rd shift arm
9. Detent assembly
30. Front oil seal
10. Snap ring
31. Bearing outer race
11. 6th relay lever
32. Magnet
12. Snap ring
33. Speedometer driven gear
13. 6th shift arm and shift rod
34. Rear cover
14. Speedometer gear
35. Parking brake cable bracket
15. Snap ring
36. Drain plug
16. 6th clutch hub assembly and sleeve
37. Needle bearing (Main end)
17. 6th gear and needle bearing
38. Rear oil seal
18. Reverse idle shaft
39. Parking brake assembly
N7A0528E
MANUAL TRANSMISSION (MZZ) 7B1-15
Disassembly
Caution:
The transmission case and clutch housing are made of
aluminum. They are easily damaged. Exercise care dur-
ing the disassembly and reassembly procedure.
Caution:
Be especially careful not to damage the transmission
case ribs. A damaged rib greatly weakens the case.
Caution:
Remember that transmission and clutch parts are heavy
and must be handled with great care to avoid serious in-
jury to yourself and others around you.
1. Remove the shift block together with the release
bearing, the clutch shaft, and the shaft fork.
• Refer to CLUTCH.
2. Remove the parking brake drum.
• Refer to PARKING BRAKES.
3. Use the special tool (9-8529-2101-0) to break the
coupler driver lock nut caulking (2 locations) and
remove the nut.
4. Remove the coupling driver together with the O-
ring.
5. Remove the parking brake assembly.
• Refer to PARKING BRAKES.
6. Remove the parking brake cable bracket from the
transmission case.
7. Remove the filler plug and O-ring.
8. Remove the drain plug and the O-ring.
• Allow time for the transmission oil to drain into a
suitable container. Check the oil volume. Look for
metallic particles and other foreign material in the
oil.
9. Remove the speedometer driven gear (2).
10. Remove the reverse switch (3).
11. Remove the 4 detent assemblies ((4), (5), (6) and
(7)).
12. Remove the control box (1) together with the inter-
lock plate (8).
13. Remove the PTO cover (1).
14. Remove the reverse idle cover (2).
15. Remove the rear cover assembly.
16. Inspect the rear cover oil seal for wear and other
damage. If wear or damage is present, the oil seal
must be replaced. Use an ordinary screwdriver to
remove it from the rear cover.
19. Reverse idle gear and needle bearing
40. Top gear shaft assembly
20. Retainer
41. Main shaft assembly
21. Counter shim
42. Countershaft assembly
8
1
2
3
4
5
7
6
N7A0529E
2
1
N7A0530E
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