lug pattern ISUZU TF SERIES 2004 Workshop Manual

3B-18 POWER-ASSISTED STEERING SYSTEM

Disassembly
1. Clean the oil pump with solvent (plug the discharge
and suction ports to prevent the entry of solvent).
Be careful not to expose the oil seal of shaf
t
assembly to solvent.
2. Remove the bolt, suction pipe and O-ring.
3. Remove the connector, O-ring, relief valve and
spring.
4. Remove the bolt, rear housing and O-ring.
5. Remove the snap ring.
6. Remove the shaft assembly.
7. Remove the oil seal.
CAUTION: When removing the oil seal, be careful
not to damage the housing.
8. Remove the pump cartridge assembly from the fron
t
housing.
9. Remove two O-rings.

Inspection and Repair
Make all necessary adjustments, repairs, and part
replacements if wear, damage, or other problems are
discovered during inspection.

Rotor
442RS002
Check that the groove in the vane is free from excessive
wear and that the vane slides smoothly. When par
t
replacement becomes necessary, the pump cartridge
should be replaced as a subassembly.



Vane
442RS003
Sliding faces of the vane should be free from wear.
(Particularly the curved face at the tip that 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 finge
r
nail.
The parts with minor scores may be reused after lapping
the face.

Relief 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 fitting face
must be free from damage and wear.

O-ring, Oil Seal, Snap 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.

POWER-ASSISTED STEERING SYSTEM 3B-23

Disassembly
1. Clean the oil pump with solvent (plug the discharge
and suction ports to prevent the entry of solvent). Be
careful not to expose the oil seal of shaft assembl
y
to solvent.
2. Remove the bolt, suction pipe and O-ring.
Remove the O-ring.
3. Remove the connector, O-ring, relief valve and
spring.
4. Remove the pressure switch assembly.
5. Remove the bolt, rear housing and O-ring.
6. Remove the snap ring.
7. Remove the shaft assembly.
8. Remove the oil seal.
CAUTION: When removing the oil seal, be careful
not to damage the housing.
9. Remove the pump cartridge assembly from the fron
t
housing.
10. Remove two O-rings.
Inspection and Repair
Make all necessary adjustments, repairs, and part
replacements if wear, damage, or other problems are
discovered during inspection.


Rotor
442RS002
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.

Vane
442RS003
Sliding faces of the vane should be free from wear.
(Particularly the curved face at the tip that 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.