Isuzu N-Series. Service manual — part 958
7B-68 Automatic Transmission (Smoother)
MYY Transmission (6-Speed)
Components
N7A1131E
Automatic Transmission (Smoother) 7B-69
Legend
1. Clutch Housing
19. 6th Clutch Hub Assembly and Sleeve
2. Clutch Housing Bushing
20. Snap Ring
3. 4th — 5th, 6th Shift Arm
21. 6th Gear and Needle Bearing
4. Interlock Plate
22. Reverse Idle Shaft
5. Gearshift Control Box
23. Reverse Idle Gear and Needle Bearing
6. Reverse Switch
24. Retainer
7. Detent Assembly
25. Counter Shim
8. Filler Plug
26. Counter Rear Bearing
9. Control Box Bracket
27. Detent Assembly
10. Harness Protector
28. Reverse Idle Cover
11. Detent Assembly
29. PTO Cover
12. Spring Pin
30. Input Shaft Speed Sensor
13. Drain Plug
31. Transmission Case
14. 6th Relay Lever
32. Detent Assembly
15. Snap Ring
33. 1st — Reverse and 2nd — 3rd Shift Arm
16. 6th Shift Arm and Shift Rod
34. Front Oil Seal
17. Speedometer Gear
35. Bearing Outer Race
18. Collar
36. Magnet
N7A1132E
7B-70 Automatic Transmission (Smoother)
Disassembly
Caution:
The transmission case and clutch housing are made of
aluminium, to be sure to exercise sufficient care to
ensure they are not damaged. A particularly high level of
care is required to protect against rib damage, which
can affect the strength of the case.
Also take care to avoid personal injury when working
with cases, gears, and other heavy items.
1. Remove the parking brake drum.
• Refer to “Parking Brake”.
2. Carefully release the caulking (two points) of the
coupling driver lock nut, and remove the lock nut by
fixing it with the flange holder (5-8840-2043-0).
3. Remove the coupling driver and O-ring.
4. Remove the parking brake assembly.
• Refer to “Parking Brake”.
5. Remove the parking brake cable bracket from the
transmission case.
6. Remove the filler plug and O-ring.
7. Remove the drain plug and O-ring.
• Drain the transmission oil. When draining the
oil, check the oil amount, and check for metal
bits and foreign matter.
8. Remove the heat protector (2) and heat protector
bracket (1).
9. Remove the gearshift control box.
a. Disconnect the five connectors from the control
box.
• Disconnect the connectors of the select
sensor (3), shift sensor (4), select solenoid
(5), 2-4-6-R shift solenoid (6), and 1-3-5 shift
solenoid (7).
37. Speedometer Driven Gear
42. Parking Brake Assembly
38. Rear Cover
43. Top Gear Shaft Assembly
39. Drain Plug
44. Main Shaft Assembly
40. Main End Needle Bearing
45. Counter Shaft Assembly
41. Rear Oil Seal
N7A0294E
N7A1083E
N7A1084E
Automatic Transmission (Smoother) 7B-71
b. Remove the harness from the clip (two points),
and remove the neutral switch connector from
the bracket.
c. Remove the six bolts and the gearshift control
box.
10. Remove the interlock plate (8).
11. Remove the speedometer driven gear (9).
12. Remove the reverse switch (10).
13. Remove the detent assembly (11), (12), (13), (14).
14. Remove the input shaft speed sensor.
15. Remove the PTO cover (1).
16. Remove the reverse idle cover (2).
17. Remove the rear cover assembly.
18. Inspect the rear cover oil seal. If it is worn or
damaged, remove it from the rear cover.
19. Use a remover (5-8840-0027-0) and sliding
hammer (5-8840-0084-0) to remove the main end
needle bearing from the rear cover.
20. Remove the 6th relay lever (1).
21. Remove the 6th shift arm (3) and 6th shift rod (4).
• Use a spring remover to drive out the spring pin
(2).
N7A1085E
N7A1137E
N7A0312E
N7A1139E
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