Isuzu KB P190. Service 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)