Isuzu N-Series. 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