Isuzu KB P190. Manual - part 66

POWER-ASSISTED STEERING SYSTEM 3B-3 

 

 PAGE 

Steering Column ..............................................................................................................   3B –  51 

Steering Column and Associated Parts ....................................................................   3B –  51 

Removal .......................................................................................................................   3B –  51 

Inspection ....................................................................................................................   3B –  54 

Installation ...................................................................................................................  3B –  55 

System Inspection (with SRS air bag).......................................................................   3B –  57 

Supplemental Restraint System Steering Wheel & Column and Associated Parts ...   3B –  58 

Main Data and Specifications ....................................................................................   3B –  58 

Special Tools ...............................................................................................................   3B –  58 

 

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. 

 

 

 

POWER-ASSISTED STEERING SYSTEM 3B-5 

Hydraulic Pump 

4JJ1-TC, 4JK1-TC 

  

 

 

RTW53BMF0003 

The hydraulic pump is vane-type design. The
submerged pump has a housing and internal parts that
are inside the reservoir and operate submerged in oil.
There are two bore openings at the rear of the pump
housing. The larger opening contains the cam ring,
pressure plate, thrust plate, rotor and vane assembly,
and end plate. The smaller opening contains the
pressure line union, flow control valve and spring. 

 

The flow control orifice is part of the pressure line union.
The pressure relief valve inside the flow control valve
limits the pump pressure. 
 

 

3B-6 POWER-ASSISTED STEERING SYSTEM 

Steering Column 

 

 

 

RTW53BLF000901 

WARNING: TO AVOID DEPLOYMENT WHEN
TROUBLE-SHOOTING THE SRS SYSTEM, DO NOT
USE ELECTRICAL TEST EQUIPMENT, SUCH AS A 
BATTERY-POWERED OR A/C-POWERED
VOLTMETER, OHMMETER, ETC., OR ANY TYPE OF 
ELECTRICAL EQUIPMENT OTHER THAN SPECIFIED
IN THIS MANUAL. DO NOT USE A NON-POWERED
PROBE-TYPE TESTER. 

INSTRUCTIONS IN THIS MANUAL MUST BE
FOLLOWED CAREFULLY, OTHERWISE PERSONAL
INJURY MAY RESULT. 
When servicing a vehicle equipped with a Supplemental 
Restraint System, pay close attention to all WARNINGS
and CAUTIONS. 
For detailed explanations about SRS, refer to Restraints
section. 
The steering column has three important features in
addition to the steering function: 

 

1.  The column is energy absorbing, designed to 

compress in a front-end collision to minimize the
possibility of injury to the driver of the vehicle. 

2. The ignition switch and lock are mounted 

conveniently on the column. 

3.  With the column mounted lock, the ignition and 

steering operation can be locked to prevent theft of 
the vehicle. 

The column can be disassembled and reassembled.
However, to insure the energy absorbing action, use
only the specified screws, bolts and nuts as designated,
and tighten them to the specified torque. 
Handle the column with care when it is removed from 
the vehicle. A sharp blow on the end of the steering 
shaft or shift lever, or dropping the assembly could
shear or loosen the fasteners that maintain column 
rigidity.