Isuzu N-Series. Service manual — part 967
7B-104 Automatic Transmission (Smoother)
Main Shaft (6-Speed)
Components
Legend
1. Snap Ring
15. 2nd — 3rd Clutch Hub Assembly and Sleeve
2. 4 — 5th Clutch Hub Assembly and Sleeve
16. 3rd Block Ring
3. 4th Block Ring
17. 3rd Outside Ring
4. 4th Gear
18. 3rd Inside Ring
5. Needle Bearing
19. Main Shaft
6. Snap Ring
20. Needle Bearing
7. Collar
21. 1st Gear
8. Needle Bearing
22. 6th Gear
9. 3rd Gear
23. Bearing
10. Needle Bearing
24. Spacer
11. 2nd Gear
25. Collar
12. 2nd Inside Ring
26. Needle Bearing
13. 2nd Outside Ring
27. Reverse Gear
14. 2nd Block Ring
28. 1st — Reverse Clutch Hub Assembly and Sleeve
N7A1223E
Automatic Transmission (Smoother) 7B-105
Disassembly
1. Remove the 6th gear.
2. Use a bearing remover to remove the following
items simultaneously with a press: bearing,
spacer, collar, reverse gear, needle bearing, 1st —
Reverse clutch hub assembly and sleeve, 1st gear,
and needle bearing.
3. Disassemble the 1st — Reverse clutch hub
assembly and sleeve.
4. Use snap ring pliers to remove the snap ring that
secures the 4th — 5th clutch hub assembly.
5. Use a bearing remover to remove the following
items simultaneously with a press: 4th — 5th clutch
hub assembly and sleeve, 4th block ring, 4th gear,
and needle bearing.
6. Disassemble the 4th — 5th clutch hub assembly
and sleeve.
7. Use snap ring pliers to remove the snap ring that
secures the 3rd gear collar.
Legend
1. Clutch Hub
2. Sleeve
N7A1195E
N7A1196E
Legend
1. Spring
2. Insert Key
3. Clutch Hub
4. Sleeve
N7A1197E
N7A1143E
7B-106 Automatic Transmission (Smoother)
8. Use a gearing remover to remove the following
items from the main shaft simultaneously with a
press: collar, 3rd gear, needle bearing, 3rd inside
ring, 3rd outside ring, 3rd block ring, 2nd — 3rd
clutch hub assembly and sleeve, 2nd block ring,
2nd outside ring, 2nd inside ring, 2nd gear, and
needle bearing.
9. Disassemble the 2nd — 3rd clutch hub assembly
and sleeve.
Inspect each part. Replace or repair as required if
anything is worn or damaged or if any other defect is
discovered.
10. Inspect each of the bearings for the following
characteristics. If any abnormality is detected,
replace the applicable bearing.
• Smoothness of rotation
• Noise
• Damage, rust, or other visible abnormality
• Abnormal play in the thrust direction
11. Inspect the gear bore.
• Use an inside dial gauge to measure the bore
of each gear.
• If the measured value exceeds the limit,
replace the gear.
12. Inspect the main shaft runout.
• Use a dial gauge to measure the bend of the
main shaft.
Legend
1. Clutch Hub
2. Sleeve
3. Ball
4. Index Block
5. Spring
N7A1199E
N7A1200E
Gear Bore (mm)
Specified Value
Limit
6th Gear
50.009 — 50.025
50.065
5th Gear
44.009 — 44.025
44.065
4th Gear
44.009 — 44.025
44.065
3rd Gear
63.010 — 63.029
63.069
2nd Gear
63.010 — 63.029
63.069
1st Gear
63.010 — 63.029
63.069
Reverse Gear
63.010 — 63.029
63.069
N7A1201E
Automatic Transmission (Smoother) 7B-107
• If the measured value exceeds the limit,
replace the main shaft.
Standard value: 0.015 mm Limit: 0.1 mm
13. Inspect the synchromesh mechanism.
• Inspect the component parts. Use an oil stone
or pencil grinder to repair any minute stepped
wear or damage.
14. Use a thickness gauge to measure the gap
between the block ring and dog gear.
• If the measured value exceeds the limit,
replace the block ring.
15. Inspect the sliding part of the clutch hub and sliding
sleeve, the insert key of the spline, and the insert
groove for wear and damage.
16. Measure the play in the spline rotation direction (on
the clutch hub outer circumference).
• If the measured value exceeds the limit,
replace.
Gap Between the Block Ring and Dog Gear (mm)
Specified Value
Limit
4th/5th/6th
1.30 — 2.60
0.5
2nd/3rd
1.00 — 2.50
0.5
N7A1202E
N7A1203E
Legend
1. Block Ring
2. Outside Ring
3. Inside Ring
Spline Play (mm)
Specified Value
Limit
0 — 0.05
0.3
N7A1204E
N7A1205E
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