Isuzu KB P190. Manual - part 1126

UNIT REPAIR (JR405E)  7A4-27 

 

Spring specifications 

No. Valve 

nomenclature 

Free length 

(mm / in) 

Outside 

diameter 
(mm / in) 

Linear 

diameter 
(mm / in) 

Number of 

coils 

14 

Pressure relief 

49.0 / 1.929 

7.6 / 0.299 

1.1 / 0.043 

17.3 

15 

Pressure regulator 

30.5 / 1.201 

14.0 / 0.551 

1.4 / 0.055 

5.7 

16 

Low and reverse brake fail (A) 

22.0 / 0.866 

7.0 / 0.276 

0.6 / 0.024 

10.0 

17 

Fail 

23.0 / 0.906 

11.0 / 0.433 

0.5 / 0.020 

13.2 

18 

Low and reverse brake amp 

19.5 / 0.768 

7.9 / 0.311 

0.5 / 0.020 

6.9 

19 

2 – 4 brake fail (A) 

24.8 / 0.976 

8.5 / 0.335 

0.9 / 0.035 

7.8 

20 

Low clutch amp (B) 

26.0 / 1.024 

11.0 / 0.433 

0.5 / 0.020 

6.9 

21 

Torque converter relief 

More than 47.2 

/ 1.858 

9.2 / 0.362 

1.6 / 0.063 

20.2 

22 

2 – 4 brake solenoid accumulator 

31.4 / 1.236 

9.8 / 0.386 

1.3 / 0.051 

9.3 

23 

High clutch accumulator 

51.0 / 2.008 

6.5 / 0.256 

0.8 / 0.031 

23.5 

 

 

 
 

Oil pressure switch 

Apply compressed air (390 kPa/4.0 kgf/cm

2

/57 psi) to the oil 

pressure switch to check the oil pressure switch continuity 
between the connector and screw. 

 

  

 

 

 

244L300011 

 
 

Oil temperature sensor (harness assembly) 

Check the oil temperature sensor resistance between harness 
terminals 7 and 6 (ground). 
 
Oil temperature sensor resistance: 2,400～

～

～

～2,600 ohms 

(20

°°°°C) 

 
 

 

 

Solenoids 

Measure the resistance of each solenoid. 
 
Resistance: 
Brown connector – 3.0

∼∼∼∼3.4 ohms (20°°°°C) 

Gray connector – 12.0

∼∼∼∼13.2 ohms (20°°°°C) 

White connector – 12.2

∼∼∼∼13.4 ohms (20°°°°C) 

 

Reassembly steps 

•  Coat the parts with ATF before installing them. 
•  Install the control valve to the control valve lower body. 
•  Install the oil filter to the control valve lower body. 

 
 

7A4-28  UNIT REPAIR (JR405E) 

 

 

OIL PUMP ASSEMBLY 

 

 

01PUMP32 

Legend 

 

1. Oil seal 

 

2. O-ring (small) 

 

3. Oil pump housing 

 

4. Inner rotor 

 

5. Outer rotor 

 

 

 

6. Oil pump cover 

 

7. O-ring (large) 

 

8. Seal ring (large) 

 

9. Seal ring (small) 

  10. Bearing race 

 

 

 

 

02PUMP07 

 
 
 

Disassembly steps 

1.  Oil pump cover 

2.  Oil pump housing 

•  Loosen the 8 bolts evenly a little at a time. 
 

UNIT REPAIR (JR405E)  7A4-29 

 

04PUMP10 

 
 

•  Separate the oil pump cover from the oil pump housing

by tapping on each of the bolts with a plastic hammer. 

 
 

 

06PUMP13 

 
 

3. Inner rotor 

Remove the inner rotor from the oil pump housing. 

 
 

 

07PUMP14 

 
 

4. Outer rotor 

Remove the outer rotor from the oil pump housing. 

 
 

 

15PUMP18 

 
 

5. O-ring (small) 

Remove the O-ring (small) from the oil pump housing. 

 
 

 

08PUMP09 

 
 

6. O-ring (large) 

Remove the O-ring (large) from the oil pump cover. 

 
 

7A4-30  UNIT REPAIR (JR405E) 

 

09PUMP05 

 
 

7. Seal ring 

Remove the 4 seal rings from the oil pump cover. 

 
 

 

11PUMP43 

 
 

Inspection 

Oil pump cover 

•  Install new seal rings to the oil pump cover. 

NOTE: 
The seal ring with the large inside diameter fits into the 
primary mating surface of the cover. 

•  Measure the gap between the seal ring and the seal ring 

groove. 

If the measured gap is outside the specified range, the

oil pump cover must be replaced. 

Seal ring and seal ring groove gap: 0.10

∼∼∼∼0.25 mm  

(0.0039

∼∼∼∼0.0098 in)

 

12PUMP45 

 
 

Inner rotor 

•  Install the inner rotor to the oil pump housing. 
•  Use a straight edge to measure the side clearance 

between the oil pump housing and the inner rotor. 

If the measured clearance is outside the specified range, 

the inner rotor must be replaced. 

Oil pump housing and inner rotor side clearance:  

0.02~0.04 mm (0.0008~0.0016 in)  

 

 

13PUMP46 

 
 

Outer rotor 

•  Install the outer rotor to the oil pump housing. 
•  Measure the gap between the outer rotor and the 

crescent. 

If the measured gap is outside the specified range, the

outer rotor must be replaced. 

Outer rotor and crescent gap: 

0.02~0.15 mm (0.0008~0.0059 in)