Isuzu N-Series. Manual — part 128
POWER STEERING 3B1-31
Tandem Hydraulic Pump
N3A0242E
3B1-32 POWER STEERING
Disassembly
1. O-ring
2. Hose Connector: HBB
3. Hose Connector: P/S
4. O-ring
5. Connector: HBB
6. O-ring
7. O-ring
8. Valve
9. Spring
10. Connector: P/S
11. O-ring
12. O-ring
13. Valve
14. Spring
15. Nut
16. Gear
17. Key
18. Rear Body
19. Gasket
20. Pin
21. Cam
22. Rotor and Vane: P/S
23. Pressure Plate
24. O-ring
25. Bolt
26. O-ring
27. Side Plate
28. Rotor and Vane: HBB
29. Cam
30. Pressure Plate
31. Pin
32. Shaft
33. Retainer
34. O-ring
35. Oil Seal
36. Pump Housing
• Use a brass drift to remove the oil seal from the
pump housing.
37. Snap Ring
• Use a mallet to remove the shaft assembly from
the front body.
38. Ball Bearing
39. Shaft
• A press and rod will be necessary to remove the
ball bearing from the shaft.
40. Retainer Ring
41. Oil Seal
42. Front Body
• Use a brass drift to remove the oil seal from the
front body.
Clean
• All parts in a suitable solvent and blow dry with
compressed air. Be sure to use clean solvent to
clean internal parts.
Inspection
• Cartridge assembly
Legend
1. O-ring
23. Pressure plate
2. Hose connector: HBB
24. O-ring
3. Hose connector: P/S
25. Bolt
4. O-ring
26. O-ring
5. Connector: HBB
27. Side Plate
6. O-ring
28. Rotor and vane: HBB
7. O-ring
29. Cam
8. Valve
30. Pressure plate
9. Spring
31. Pin
10. Connector: P/S
32. Shaft
11. O-ring
33. Retainer
12. O-ring
34. O-ring
13. Valve
35. Oil seal
14. Spring
36. Pump housing
15. Nut
37. Snap ring
16. Gear
38. Ball bearing
17. Key
39. Shaft
18. Rear body
40. Retainer ring
19. Gasket
41. Oil seal
20. Pin
42. Front body
21. Cam
P/S: Power steering
22. Rotor and vane: P/S
HBB: Hydraulic booster brake
POWER STEERING 3B1-33
– Vane tips of cartridge assembly for wear.
– Vanes for scoring or wear.
– Inner surface of the ring for scoring, wear, dam-
age, etc.
– Fit of the vanes in the rotor. The vanes must fit
property in the rotor slots, without sticking or
excessive play. Also check for burrs in the rotor
slots, and excessive wear at the thrust faces.
– If heavy wear is present, or if parts are dam-
aged, replace the entire cartridge assembly.
• Side place for wear at the thrust faces.
Replace if excessive wear is evident.
• Ball bearing. If the bearing is rough or loose, re-
place it.
• Seal contact area of the shaft. If fretting or rough-
ness is present, replace the shaft.
• Gear for rough or chipped teeth.
• Flow control valve assembly for scoring or burrs.
Also, inspect the flow control valve bore in the
pump housing for burrs.
If heavy damage is present, replace pump housing as-
sembly together with valves.
Reassembly
1. Oil Seal
2. Front Body
• Oil seal into the front body using a proper size rod
and press or hammer.
3. Shaft
4. Ball Bearing
• Press the shaft, into the ball bearing as illustration.
5. Retaining Ring
• Place the retaining ring in the front body and install
the shaft assembly into the front body using a
press or hammer.
6. Snap Ring
• Snap ring into front body.
7. Oil Seal
8. Pump Housing
• Oil seal into pump housing using a proper size rod
and press or hammer.
9. O-ring
10. Retainer
11. Shaft
12. Pressure Plate
13. Cam
14. Rotor and Vane: HBB
15. Side Plate
16. Pin
• Set pressure plate, cam, rotor and vane, side plate,
and pins into pump housing as illustration.
Legend
1. Shield plate
2. Stamping
N3A0244E
N3A0245E
N3A0246E
3B1-34 POWER STEERING
17. O-ring
18. Bolt
• Attach O-rings into front body grooves and assem-
ble front body and pump housing by tightening
bolts.
Tighten:
• Bolt and nut to
4 (four) bolts: 54 N
⋅m (5.5 kg⋅m / 40 lb⋅ft)
1 (one) bolt: 25 N
⋅m (2.5 kg⋅m / 18 lb⋅ft)
19. O-ring
20. Pressure Plate
21. Rotor and Vane: P/S
22. Cam
23. Pin
• Set pressure plate, rotor and vane, cam and pins
into pump housing as illustration.
24. Gasket
25. Rear Body
Tighten:
• Bolt and nut to 34 N
⋅m (3.5 kg⋅m / 25 lb⋅ft)
26. Key
27. Gear
28. Nut
• Key, gear and nut onto shaft.
• The long hub of the gear faces front body.
Tighten:
• Bolt and nut to 103 N
⋅m (10.5 kg⋅m / 76 lb⋅ft)
29. Spring
30. Valve
31. O-ring
32. O-ring
33. Connector: P/S
• Spring, valve, O-ring, O-rings and connector into
pump housing.
Tighten:
• Bolt and nut to 54 N
⋅m (5.5 kg⋅m / 40 lb⋅ft)
34. Spring
35. Valve
36. O-ring
37. O-ring
38. Connector: HBB
• Spring, valve, O-ring, O-rings and connectors into
pump housing.
Tighten:
• Bolt and nut to 54 N
⋅m (5.5 kg⋅m / 40 lb⋅ft)
39. O-ring
40. Hose Connector: P/S
41. Hose Connector: HBB
Tighten:
• Bolt and nut to 21 N
⋅m (2.1 kg⋅m / 15 lb⋅ft)
42. O-ring
Legend
A. Front view
B. Rear view
1. Pressure plate
2. Cam, Rotor and vane
3. Side plate
4. Oblong hole
5. Stamping
Legend
A. Front view
1. Pressure plate
2. Rotor and vane, Cam
3. Oblong hole
4. Stamping
N3A0247E
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