Isuzu N-Series. 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

MAX
2.5mm

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

N7A0529E

N7A0530E

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