ISUZU TROOPER 1998 Service Repair Manual

POWER STEERING 2A – 29
DISASSEMBLY
Preparation:
Clean oil pump with solvent (plug the discharge and
suction port, to prevent the entry of solvent). Be careful
not to expose the oil seal of shaft assembly to solvent.
1. Bolt
2. Pipe, Suction
3. O-ring
4. Connector
5. O-ring
6. Valve Assembly
7. Retaining Ring
8. Filter
9. Spring
10. Pressure switch
11. Retaining Ring
12. Shaft Assembly
13. Bearing
14. Shaft
15. Retaining Ring
16. Oil Seal
CAUTION:
When removing the oil seal, be careful not to damage the
housing.
17. Bolt
18. Rear Housing Assembly and Pump Cartridge
19. Gasket
20. O-ring
21. O-ring
22. Front Housing
23. Pressure Plate
24. Rotor and Vane
25. Cam
26. Pin
27. Rear Housing
INSPECTION AND REPAIR
Make all necessary adjustments, repairs, and part
replacements if wear, damage, or other problems are
discovered during inspection.
Rotor
Check that the groove in the vane is free from excessive
wear and that the vane slides smoothly.
When part replacement becomes necessary, the pump
cartridge should be replaced as a subassembly.

2A – 30 POWER STEERING
Vane
Sliding faces of the vane should be free from wear.
(Particularly the curved face at the tip in contact with the
cam should be free from wear and distortion).
When part replacement becomes necessary, the pump
cartridge should be replaced as a subassembly.
Cam
The inner face of the arm should have a uniform contact
pattern without a sign of step wear.
When part replacement becomes necessary, the pump
cartridge should be replaced as a subassembly.
Side plate
The sliding faces of parts must be free from step wear
(more than 0.01 mm), which can be felt by the finger nail.
The parts with minor scores may be reused after lapping
the face.
Valve
The sliding face of the valve must be free from burrs and
damage.
The parts with minor scores may be reused after
smoothing with emery cloth (#800 or finer).
Shaft
Oil seal sliding faces must be free from a step wear which
can be felt by the finger nail.
Bushing face must be free from damage and wear.
O-ring, oil seal, retaining ring
Be sure to discard used parts, and always use new parts
for installation. Prior to installation, lubricate all seals and
rings with power steering fluid.
REASSEMBLY
27. Rear Housing
26. Pin
25. Cam
24. Rotor and Vane
1. Install the rotor with its punch mark facing the front
housing.
2. Install the vanes with curved face in contact with
the inner wall of the cam.

POWER STEERING 2A – 31
23. Pressure Plate
CAUTION:
When installing side plate, be careful not to damage its
inner surface. Damaged side plate may cause poor pump
performance, pump seizure or oil leakage.
22. Front Housing
21. O-ring
20. O-ring
Be sure to discard used O-rings, and always use new
parts for installation.
19. Gasket
Be sure to discard used parts, and always use new
parts for installation.
18. Rear Housing Assembly and Pump Cartridge
17. Bolt
Rear Housing Bolt Torque N·m (kg·m/lb·ft)
17.6 (1.8 / 12.8)
16. Oil Seal
Be sure to discard used parts, and always use new
parts for installation.
CAUTION:
When installing the oil seal, be careful not to damage the
oil seal contacting surface of the housing.
15. Retaining Ring
14. Shaft
13. Bearing
12. Shaft Assembly
11. Retaining Ring
10. Pressure switch
Pressure Switch Torque N·m (kg·m/lb·ft)
20 (2.0 / 14)
9. Spring
8. Filter
7. Retaining Ring
6. Valve
5. O-ring
Be sure to discard used parts, and always use new
parts for installation.
4. Connector
Connector Torque N·m (kg·m/lb·ft)
74 (7.5 / 54)
3. O-ring
Be sure to discard used parts, and always use new
parts for installation.
2. Pipe, Suction
1. Bolt
Suction Pipe Bolt Torque N·m (kg·m/lb·ft)
15.7 (1.6 / 11.5)

2A – 32 POWER STEERING
POWER STEERING PUMP (4JG2 Engine Model)
Disassembly Steps
1. Bolt
2. Pipe, suction
3. O-ring
4. O-ring
5. O-ring
6. Connector
7. O-ring
8. Valve
9. Retaining ring
10. Filter
11. Spring
12. Retaining ring
13. Shaft assembly
14. Bearing
15. Shaft16. Retaining ring
17. Oil seal
18. Bolt
19. Rear housing assembly and pump
cartridge
20. Gasket
21. O-ring
22. O-ring
23. Front housing
24. Pressure plate
25. Rotor and vane
26. Cam
27. Pin
28. Rear housing
Reassembly Steps
28. Rear housing
27. Pin
26. Cam
25. Rotor and vane
24. Pressure plate
23. Front housing
22. O-ring
21. O-ring
20. Gasket
19. Rear housing assembly and pump
cartridge
18. Bolt
17. Oil seal
16. Retaining ring
15. Shaft14. Bearing
13. Shaft assembly
12. Retaining ring
11. Spring
10. Filter
9. Retaining ring
8. Valve
7. O-ring
6. Connector
5. O-ring
4. O-ring
3. O-ring
2. Pipe, suction
1. Bolt

POWER STEERING 2A – 33
DISASSEMBLY
Preparation:
Clean oil pump with solvent (its plug discharge and
suction port to prevent the entry of solvent). Be careful not
to expose the oil seal of shaft assembly to solvent.
1. Bolt
2. Pipe, Suction
3. O-ring
4. O-ring
5. O-ring
6. Connector
7. O-ring
8. Valve
9. Retaining Ring
10. Filter
11. Spring
12. Retaining Ring
13. Shaft Assembly
14. Bearing
15. Shaft
16. Retaining Ring
17. Oil Seal
CAUTION:
When removing the oil seal, be careful not to damage the
housing.
18. Bolt
19. Rear Housing Assembly and Pump Cartridge
20. Gasket
21. O-ring
22. O-ring
23. Front Housing
24. Pressure Plate
25. Rotor and Vane
26. Cam
27. Pin
28. Rear Housing

2A – 34 POWER STEERING
REASSEMBLY
28. Rear Housing
27. Pin
26. Cam
25. Rotor and Vane
Install the rotor with its punch mark facing the front
housing.
Install the vane with curved face in contact with the
inner wall of the cam.
24. Pressure Plate
CAUTION:
When install pressure plate, be careful not to damage its
inner surface. Damaged pressure plate may cause poor
pump performance, pump seizure or oil leakage.
23. Front Housing
22. O-ring
Be sure to discard used parts, and always used new
parts for installation.
21. O-ring
Be sure to discard used parts, and always used new
parts for installation.
20. Gasket
Be sure to discard used parts, and always used new
parts for installation.
19. Rear Housing Assemble and Pump Cartridge
18. Bolt
Rear Housing Bolt Torque N·m (kg·m/lb·ft)
54 (5.5 / 40)
17. O-ring
Be sure to discard used parts, and always used new
parts for installation.

POWER STEERING 2A – 35
CAUTION:
When install pressure plate, be careful not to damage its
inner surface. Damaged pressure plate may cause poor
pump performance, pump seizure or oil leakage.
16. Retaining Ring
15. Shaft
14. Bearing
13. Shaft Assembly
12. Retaining Ring
11. Spring
10. Filter
9. Retaining Ring
8. Valve
7. O-ring
Be sure to discard used parts, and always used new
parts for installation.
6. Connector
Connector Torque N·m (kg·m/lb·ft)
54 (5.5 / 40)
5. O-ring
Be sure to discard used parts, and always used new
parts for installation.
4. O-ring
Be sure to discard used parts, and always used new
parts for installation.
3. O-ring
Be sure to discard used parts, and always used new
parts for installation.
2. Pipe, Suction
1. Bolt
Suction Pipe Bolt Torque N·m (kg·m/lb·ft)
21 (2.1 / 15)

2A – 36 POWER STEERING
POWER STEERING PUMP (4JX1 Engine Model)
17 1 18 227654
3 2
19
20 2115
14
16
8
10
12
11
13 9
23
Disassembly Steps
1. O-ring
2. Pipe, suction
3. O-ring
4. Connector
5. O-ring
6. Valve
7. Spring
8. Bolt
9. Rear housing assembly
10. O-ring
11. Pump cartridge
12. Cam13. Rotor and vane
14. Pressure plate
15. O-ring
16. O-ring
17. Gear
18. Retaining ring
19. Shaft assembly
20. Bearing
21. Shaft
22. Oil seal
23. Front housing
Reassembly Steps
23. Front housing
22. Oil seal
21. Shaft
20. Bearing
19. Shaft assembly
18. Retaining ring
17. Gear
16. O-ring
15. O-ring
14. Pressure plate
13. Rotor and vane
12. Cam11. Pump cartridge
10. O-ring
9. Rear housing assembly
8. Bolt
7. Spring
6. Valve
5. O-ring
4. Connector
3. O-ring
2. Pipe, suction
1. O-ring
412RW048

POWER STEERING 2A – 37
DISASSEMBLY
Preparation:
Clean oil pump with solvent (plug the discharge and
suction port to prevent the entry of solvent). Be careful not
to expose the oil seal of shaft assembly to solvent.
1. O-ring
2. Pipe, Suction
3. O-ring
4. Connector
5. O-ring
6. Valve
7. Spring
8. Bolt
9. Rear Housing Assembly
10. O-ring
11. Pump Cartridge
12. Cam
13. Rotor and Vane
14. Pressure Plate
15. O-ring
16. O-ring
17. Gear
18. Retaining Ring
19. Shaft Assembly
20. Bearing
21. Shaft
22. Oil seal
CAUTION:
When removing the oil seal, be careful not to damage the
housing.
23. Front Housing

2A – 38 POWER STEERING
REASSEMBLY
23. Front Housing
22. Oil Seal
Be sure to discard used parts, and always used new
parts for installation.
21. Shaft
20. Bearing
19. Shaft Assembly
18. Retaining Ring
17. Gear
16. O-ring
Be sure to discard used parts, and always used new
parts for installation.
15. O-ring
Be sure to discard used parts, and always used new
parts for installation.
14. Pressure Plate
CAUTION:
When install pressure plate, be careful not to damage its
inner surface. Damaged pressure plate may cause poor
pump performance, pump seizure or oil leakage.
13. Rotor and Vane
Install the vane with curved face in contact with the
inner wall of the cam.
12. Cam
11. Pump Cartridge
10. O-ring
Be sure to discard used parts, and always used new
parts for installation.
9. Rear Housing Assembly
8. Bolt
Rear Housing Bolt Torque N·m (kg·m/lb·ft)
24 (2.4 / 17)