Isuzu KB P190. Manual - part 1127

UNIT REPAIR (JR405E)  7A4-31 

 
 

 
 

Reassembly steps 

 

15PUMP18 

 
 

1. O-ring (small) 

Install new O-ring (small) to the oil pump housing. 

 

 

16PUMP29 

 
 

2. Outer rotor 

3. Inner rotor 

Install the outer rotor and the inner rotor to the oil pump

housing. 

 

 

17PUMP42 

 
 

NOTE: 
The identification mark on the inner rotor must be facing 
the inside of the oil pump housing. 

 

18PUMP07 

 
 

4.  Oil pump cover 

5.  Oil pump housing 

Install the oil pump cover to the oil pump housing. 

Tighten the 8 bolts to the specified torque. 

Torque: 9 N

⋅⋅⋅⋅m (0.9 kgf⋅⋅⋅⋅m/78 Ib⋅⋅⋅⋅in) 

 

 

 

 
 

6. O-ring (large) 

Install the O-ring (large) to the oil pump cover. 

7. Seal ring 

Install the 4 seal rings to the oil pump cover. 

 

7A4-32  UNIT REPAIR (JR405E) 

 

 

CLUTCH PACK (REVERSE AND 
HIGH CLUTCH ASSEMBLY) 

 

 

01R&H17 

Legend 

 

1. Reverse and high clutch drum 

 

2. Seal ring (reverse clutch) 

 

3. Lip seal (reverse clutch) 

 

4. Reverse clutch piston 

 

5. Seal ring (small, high clutch) 

 

6. Seal ring (large, high clutch) 

 

7. High clutch piston 

 

8. Return spring 

 

9. High clutch cover 

  10. Snap ring 

 

 

  11. Dish plate (high clutch) 
  12. Driven plate (5, high clutch) 
  13. Drive plate (5, high clutch) 
  14. Retaining plate (high clutch) 
  15. Snap ring (high clutch) 
  16. Dish plate (reverse clutch) 
  17. Driven plate (2, reverse clutch) 
  18. Drive plate (2, reverse clutch) 
  19. Retaining plate (reverse clutch) 
  20. Snap ring (reverse clutch) 

 

 

 

 

02R&H18 

 
 

Disassembly steps 

1. Snap ring 

Remove the reverse clutch snap ring. 

 

UNIT REPAIR (JR405E)  7A4-33 

 

03R&H21 

 
 

2. Retaining plate, drive plates, driven plates and dish 

plate 

Remove the reverse clutch retaining plate, the 2 drive

plates, the 2 driven plates, and the dish plate. 

 

 

04R&H22 

 
 

3. Snap ring 

Remove the high clutch snap ring. 

 

 

05R&H25 

 
 

4. Retaining plate, drive plates, driven plates and dish

plate 

Remove the high clutch retaining plate, the 5 drive plates, 

the 5 driven plates, and the dish plate. 

 

 

07R&H28 

 
 

5. Snap ring 

6.  High clutch cover 

7. Return spring 

•  Install the spring compressor to the reverse and high 

clutch drum. 

Spring compressor: 5-8840-2767-0 

•  Carefully press the high clutch cover down. 

Take care not to damage the return spring. 

•  Remove the snap ring. 
•  Remove the high clutch cover and the return spring. 
 

 

 

 

7A4-34  UNIT REPAIR (JR405E) 

 

08R&H36 

 
 

8.  High clutch piston 

9.  Reverse clutch piston 

•  Install the reverse and high clutch drum to the oil pump.
•  Force compressed air into the oil pump oil channels. 
•  Remove the high clutch piston and the reverse clutch 

piston. 

 

 

09R&H37 

 
 

 

 

12R&H39 

 
 

10.Seal ring (high clutch) 

Remove the 2 seal rings from the high clutch piston. 

 

13R&H38 

 
 

11.Seal ring (reverse clutch) 

Remove the 2 seal rings from the reverse clutch piston. 

 

 

 

 
 

Inspection 

Drive plates 

•  Measure the drive plate facing thickness at 3 points. 
•  Calculate the average value. 

If the average value is less than the specified limit, the

drive plate must be replaced. 

Drive plate facing thickness:  

Standard – 2.0 mm (0.079 in) 

Limit – 1.8 mm (0.071 in)