Isuzu KB P190. Manual — part 1124

UNIT REPAIR (JR405E) 7A4-19

Disassembly steps

• Remove the 11 steel balls and springs from the control

valve upper body.

244L300005

Legend

1. Steel ball: A – 10 (Silver)

B – 1 (Black)

2.

Spring

3. Separation plate

• Remove the control valves from the control valve upper

body.

NOTE:
Place the control valve where it will not get mixed up with
the other parts.

7A4-20 UNIT REPAIR (JR405E)

Inspection

Valve

Inspect each of the valves for denting and other damage.

Spring

Inspect each of the springs for wear and fatigue.

Valve specifications

244L300006

UNIT REPAIR (JR405E) 7A4-21

No.

Valve

nomenclature

Diameter

(mm / in)

Length

(mm / in)

Configuration

1 Manual

12.0 /
0.472

82.0 /
3.228

2

2 – 4 brake
accumulator

15.0 /
0.591

37.5 /
1.476

3

Low and reverse
brake fail (B)

10.0 /
0.394

52.0 /
2.047

4 Reverse

stall

8.0 /

0.315

50.0 /
1.969

5

Low and reverse
brake solenoid
accumulator

14.0 /
0.551

19.5 /
0.768

6 Pilot

12.0 /
0.472

38.5 /
1.516

7

Low clutch
solenoid
accumulator

14.0 /
0.551

19.5 /
0.768

8

Low clutch amp
(A)

12.0 /
0.472

53.5 /
2.106

9

2 – 4 brake fail
(B)

10.0 /
0.394

39.0 /
1.535

10 Lock-up

control

12.9 /
0.508

57.5 /
2.264

11

2 – 4 brake amp

12.0 /
0.472

53.5 /
2.106

7A4-22 UNIT REPAIR (JR405E)

12

High clutch amp

12.0 /
0.472

53.5 /
2.106

13

High clutch
solenoid
accumulator

14.0 /
0.551

19.5 /
0.768

Spring specifications

No. Valve

nomenclature

Free length

(mm / in)

Outside

diameter (mm

/ in)

Linear

diameter (mm

/ in)

Number of

coils

1 Manual

----

----

----

----

2

2 – 4 brake accumulator

43.9 / 1.728

11.0 / 0.433

2.0 / 0.079

13.1

3

Low and reverse brake fail (B)

22.0 / 0.866

7.0 / 0.276

0.6 / 0.024

10.0

4

Reverse stall

31.5 / 1.240

7.0 / 0.276

1.0 / 0.039

12.8

5 Low and reverse solenoid brake

accumulator

31.4 / 1.236

9.8 / 0.386

1.3 / 0.051

9.3

6

Pilot

32.0 / 1.260

11.0 / 0.433

1.3 / 0.051

9.2

7

Low clutch solenoid accumulator

31.4 / 1.236

9.8 / 0.386

1.3 / 0.051

9.3

8

Low clutch amp (A)

23.0 / 0.906

11.0 / 0.433

0.5 / 0.020

13.2

9

2 – 4 brake fail (B)

24.8 / 0.976

8.5 / 0.335

0.9 / 0.035

7.8

10

Lock-up control

27.0 / 1.063

14.0 / 0.551

1.1 / 0.043

5.7

11

2 – 4 brake amp

23.0 / 0.906

11.0 / 0.433

0.5 / 0.020

13.2

12

High clutch amp

23.0 / 0.906

11.0 / 0.433

0.5 / 0.020

13.2

13

High clutch solenoid accumulator

31.4 / 1.236

9.8 / 0.386

1.3 / 0.051

9.3

Reassembly steps

• Coat the parts with ATF before installing them.
• Install the control valve to the upper body.
• Install the 11 steel balls and springs to the upper body.