2007 ISUZU KB P190 steering rack

3B-4 POWER-ASSISTED STEERING SYSTEM
General Description
The hydraulic power steering system consists of a
pump, an oil reservoir, a steering unit, a pressure hose
and a return hose.

Power Steering Unit

440R300001
The power steering unit is a rack and pinion type.
The toe-in angle can be adjusted by turning the rod on
each side.
The steering housing cannot be disassembled.


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ISUZU KB P190 2007

POWER-ASSISTED STEERING SYSTEM 3B-11
Power Steering Unit
Power Steering Unit and Associated Parts


431R300016
Legend
(1) Crossmember
(2) Power Steering Unit Assembly
(3) Bracket
(4) Universal joint (Steering shaft)


Removal
1. Remove the universal joint assembly. Make a setting mark across the coupling flange and
steering unit to insure reassembly of the parts in the
original position.
2. Drain power steering fluid.

3. Remove the tie rod end assembly from knuckle.
Use tie rod end remover 5-8840-2005-0.


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ISUZU KB P190 2007

POWER-ASSISTED STEERING SYSTEM 3B-13
Power Steering Unit Disassembled View

RTW 53BLF000401
Legend
(1) Tie-rod End
(2) Lock Nut
(3) Clip
(4) Bellows
(5) Band
(6) Tie-rod Assembly
(7) Oil Line
(8) Rack Bar
(9) Tab W asher
(10) Mounting Rubber
(11) Housing Assembly
(12) Dust Cover



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ISUZU KB P190 2007

POWER-ASSISTED STEERING SYSTEM 3B-15
3. Install tie-rod assembly with tab washer, then tighten
to specified torque. For 4 ×2 except High ride suspension models;
Torque: 83 N ⋅
⋅⋅
⋅
m (8.5 kgf ⋅
⋅⋅
⋅
m/61 lb ⋅
⋅⋅
⋅
ft)
For 4 ×4 and 4 ×2 High ride suspension models;
Torque: 108 N ⋅
⋅⋅
⋅
m (11.0 kgf ⋅
⋅⋅
⋅
m/80 lb ⋅
⋅⋅
⋅
ft)
After tightening, bend tab washer against width
across flat of inner ball joint.
4. Apply grease to the tie-rod groove. Install bellows on housing assembly.
CAUTION :
Make sure that there are no bulges or dents in the
bellows.
After installation, confirm the small end of the
bellows is inserted into the tie-rod groove.











RUW 53BSH000301

5. Caulk the band using clamp pliers 5-8840-2745-0.
For 4 ×2 except High ride suspension models;
Caulk gap(A): less than 2.0mm(0.08in).
For 4 ×4 and 4 ×2 High ride suspension models;
Caulk gap(A): 2.6 – 3.3mm(0.10 – 0.13in).

CAUTION :
Be sure to use a new band.





RUW 53BSH000601
6. Install clip.
7. Install tie-rod end and tighten lock nut.
Torque:
98 N ⋅
⋅⋅
⋅
m (10 kgf ⋅
⋅⋅
⋅
m/72 lb ⋅
⋅⋅
⋅
ft)


Main Data and Specifications
General Specifications
2W D 4W D
Power steering W ithout W ith
Type Rack and pinion
Rack stroke mm (in) 138 (5.43) 138 (5.43) 152 (5.98)
Steering unit
Lock to lock 4.84 3.38 3.23


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ISUZU KB P190 2007

POWER-ASSISTED STEERING SYSTEM 3B-17
Power Steering Pump (4JH1-TC, 4JA1-T)
Power Steering Pump and Associated Parts


RTW 53BMF000401
Legend (1) Pump Assembly
(2) Suction Hose
(3) Flexible Hose
(4) Bolt
(5) Bracket


Removal
1. Remove the drive belt.
2. Remove the pulley
3. Place a drain pan below the pump.
4. Disconnect the suction hose.
5. Disconnect the flexible hose.
6. Remove the power steering fixing bolt and remove the pump assembly.

Installation
1. Install the pump assembly to the pump braket,
tighten the fixing bolt to the specified torque.
Torque: 40 N·m (4.1 kgf·m/30 lb·ft)
2. Install the flexible hose.
Tighten the nut to specified torque.
Torque: 20 N·m (2.0 kgf·m/14 lb·ft)
3. Install the pulley and tighten the bolt to the specified torque.
Torque: 28 N·m (2.9 kgf·m/21 lb·ft)
4. Install the drive belt.
5. Connect the suction hose, then fill and bleed system.
Refer to Bleeding the Power Steering System in this section.

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ISUZU KB P190 2007

POWER-ASSISTED STEERING SYSTEM 3B-23
Power Steering Pump Disassembled View







RTW 53BLF002001
Legend (1) Bolt
(2) Suction Pipe
(3) O-ring
(4) O-ring
(5) O-ring
(6) O-ring
(7) Side Plate
(8) Rotor and Vanes
(9) Pump Cartridge Assembly
(10) O-ring
(11) Rear Housing
(12) Bolt
(13) Spring
(14) Relief Valve
(15) O-ring
(16) Connector
(17) O-ring
(18) Joint
(19) W asher
(20) Nut
(21) Bracket
(22) Nut
(23) Shaft and Housing Assembly



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ISUZU KB P190 2007

3B-24 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 the shaft assembly to solvent.
2. Remove the bolt, suction pipe and O-ring.
3. Remove the nut and bracket.
4. Remove the nut, washer and joint.
5. Remove the connector, O-ring, relief valve and spring.
6. Remove the bolt, rear housing and O-ring.
7. Remove the pump cartridge assembly and the side plate from the shaft. 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. W hen 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. (In
particular the curved face at the tip that makes contact
with the cam should be free from wear and distortion).
W hen part replacement becomes necessary, the pump
cartridge should be replaced as a subassembly.

Cam
The inner face of the cam should have a uniform
contact pattern without a sign of step wear. W hen 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 (0.0004 in)), which can be felt by a
finger nail.
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. Parts with minor scores may be reused
after smoothing with emery cloth (#800 or finer).

Shaft and Housing Assembly
The bushing fitting face on the shaft must be free from
damage and wear.

O-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.



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ISUZU KB P190 2007

POWER-ASSISTED STEERING SYSTEM 3B-25
Reassembly
1. Install two new O-rings on shaft and housing
assembly. Be sure to discard used O-ring.
2. Install side plate.
CAUTION: When installing side plate, be careful not
to damage its inner surface. A damaged side plate
may cause poor pump performance, pump seizure
or oil leakage.
3. Install the vanes on rotor with curved face in contact with the inner wall of cam.
442RS005
4. Install rotor and vanes on cam.
5. Install pump cartridge assembly on shaft and housing assembly.
6. Install a new O-ring on rear housing. Be sure to discard used O-ring. Then install bolt and tighten it to
specified torque.
Torque: 25 N ⋅
⋅⋅
⋅
m (2.5 kgf ⋅
⋅⋅
⋅
m/18 lb ⋅
⋅⋅
⋅
ft)
7. Install a new O-ring on suction pipe. Be sure to
discard used O-ring. Then install bolt and tighten it to
specified torque.
Torque: 10 N ⋅
⋅⋅
⋅
m (1.0 kgf ⋅
⋅⋅
⋅
m/87 lb ⋅
⋅⋅
⋅
in)
8. Install relief valve and spring.
9. Install a new O-ring on connector. Be sure to discard used O-ring. Tighten the connector to specified
torque.
Torque: 59 N ⋅
⋅⋅
⋅
m (6.0 kgf ⋅
⋅⋅
⋅
m/43 lb ⋅
⋅⋅
⋅
ft)
10. Install new O-rings on joint. Be sure to discard used
O-rings. Temporarily tighten the nut with washer.
11. Install bracket. Then install nut and tighten it to specified torque.
Torque: 12 N ⋅
⋅⋅
⋅
m (1.2 kgf ⋅
⋅⋅
⋅
m/104 lb ⋅
⋅⋅
⋅
in)
12. Tighten the nut to the specified torque (This nut was
temporarily tightened in step 10).
Torque: 20 N ⋅
⋅⋅
⋅
m (2.0 kgf ⋅
⋅⋅
⋅
m/14 lb ⋅
⋅⋅
⋅
ft)


Main Data and Specifications
General Specifications
Oil pump Type Vane
Operating fluid
ATF DEXRON®―III


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ISUZU KB P190 2007