Isuzu KB P190. Manual - part 71

POWER-ASSISTED STEERING SYSTEM 3B-23 

Power Steering Pump Disassembled View 

  
 
 
 
 

 

 

RTW53BLF002001 

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) Washer 

(20) Nut 

(21) Bracket 

(22) Nut 

(23)  Shaft and Housing Assembly 

 

 

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. 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. (In 
particular the curved face at the tip that makes 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 cam 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 (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. 
 

 

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 

 

3B-26 POWER-ASSISTED STEERING SYSTEM 

Torque Specifications 

 

N

⋅m (kgf⋅m/Ib⋅ft) 

 

 

 

 

RTW73BLF000701