Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Service manual — part 568
POWER ASSISTED SYSTEM
2A–1
TROOPER
STEERING
POWER ASSISTED SYSTEM
CONTENTS
Service Precaution
2A–2
. . . . . . . . . . . . . . . . . . . . . .
General Description
2A–2
. . . . . . . . . . . . . . . . . . . . .
Diagnosis
2A–5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Steering System Test
2A–11
. . . . . . . . . . . . . .
Maintenance
2A–12
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid Level
2A–12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bleeding The Power Steering System
2A–12
. . . . . .
Bleeding Procedure
2A–12
. . . . . . . . . . . . . . . . . . . . .
Flushing The Power Steering System
2A–12
. . . . . .
Steering Wheel Free Play Adjustment
2A–13
. . . . . .
Front End Alignment Inspection and
Adjustment
2A–13
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main Data and Specifications
2A–18
. . . . . . . . . . . . .
Special Tools
2A–19
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Steering Gear
2A–20
. . . . . . . . . . . . . . . . . . . .
Power Steering Gear and Associated
Parts
2A–20
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal
2A–20
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation
2A–21
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Steering Gear Disassembled View
2A–22
. . . . . . .
Disassembly
2A–23
. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Repair
2A–24
. . . . . . . . . . . . . . . . . .
Reassembly
2A–25
. . . . . . . . . . . . . . . . . . . . . . . . . .
Main Data and Specifications
2A–27
. . . . . . . . . . .
Power Steering Pump
2A–28
. . . . . . . . . . . . . . . . . . . .
Power Steering Pump and Associated
Parts
2A–28
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal
2A–28
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation
2A–29
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Steering Pump Disassembled View
2A–30
Disassembly
2A–30
. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Repair
2A–31
. . . . . . . . . . . . . . . . . .
Reassembly
2A–32
. . . . . . . . . . . . . . . . . . . . . . . . . .
1Main Data and Specifications
2A–33
. . . . . . . . . .
Center Track Rod Assembly
2A–34
. . . . . . . . . . . . . .
Center Track Rod Assembly and
Associated Parts
2A–34
. . . . . . . . . . . . . . . . . . . . . .
Removal
2A–35
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Repair
2A–35
. . . . . . . . . . . . . . . . . .
Installation
2A–35
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Outer Track Rod Assembly
2A–36
. . . . . . . . . . . . . . .
Outer Track Rod Assembly and Associated
Parts
2A–36
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal
2A–37
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Repair
2A–37
. . . . . . . . . . . . . . . . . .
Installation
2A–38
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Relay Lever
2A–39
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Relay Lever and Associated Parts
2A–39
. . . . . . .
Removal
2A–39
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation
2A–40
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Steering Linkage and Associated Parts
2A–41
. . . .
Main Data and Specifications
2A–41
. . . . . . . . . . .
Special Tools
2A–42
. . . . . . . . . . . . . . . . . . . . . . . . . .
Supplemental Restraint System Steering
Wheel & Column
2A–43
. . . . . . . . . . . . . . . . . . . . . . .
Service Precaution
2A–43
. . . . . . . . . . . . . . . . . . . .
SRS Connectors
2A–43
. . . . . . . . . . . . . . . . . . . . . .
Inflator Module
2A–45
. . . . . . . . . . . . . . . . . . . . . . . . . .
Inflator Module and Associated Parts
2A–45
. . . . .
Removal
2A–45
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Repair
2A–46
. . . . . . . . . . . . . . . . . .
Installation
2A–46
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Steering Wheel
2A–47
. . . . . . . . . . . . . . . . . . . . . . . . .
Steering Wheel and Associated Parts
2A–47
. . . .
Removal
2A–47
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation
2A–49
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Combination Switch
2A–50
. . . . . . . . . . . . . . . . . . . . .
Combination Switch and Associated Parts
2A–50
Removal
2A–50
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation
2A–52
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lock Cylinder
2A–54
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Lock Cylinder and Associated Parts
2A–54
. . . . . .
Removal
2A–54
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation
2A–56
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Inspection
2A–57
. . . . . . . . . . . . . . . . . . . . .
Steering Column
2A–58
. . . . . . . . . . . . . . . . . . . . . . . .
Steering Column and Associated Parts
2A–58
. . .
Removal
2A–58
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection
2A–60
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation
2A–62
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Inspection
2A–63
. . . . . . . . . . . . . . . . . . . . .
Supplemental Restraint System Steering
Wheel & Column and Associated Parts
2A–64
. . . .
Main Data and Specifications
2A–64
. . . . . . . . . . .
Special Tools
2A–65
. . . . . . . . . . . . . . . . . . . . . . . . . .
2A–2
POWER ASSISTED SYSTEM
Service Precaution
WARNING: THIS VEHICLE HAS A SUPPLEMENTAL
RESTRAINT SYSTEM (SRS). REFER TO THE SRS
COMPONENT AND WIRING LOCATION VIEW IN
ORDER TO DETERMINE WHETHER YOU ARE
PERFORMING SERVICE ON OR NEAR THE SRS
COMPONENTS OR THE SRS WIRING. WHEN YOU
ARE PERFORMING SERVICE ON OR NEAR THE SRS
COMPONENTS OR THE SRS WIRING, REFER TO
THE SRS SERVICE INFORMATION. FAILURE TO
FOLLOW WARNINGS COULD RESULT IN POSSIBLE
AIR BAG DEPLOYMENT, PERSONAL INJURY, OR
OTHERWISE UNNEEDED SRS SYSTEM REPAIRS.
CAUTION: Always use the correct fastener in the
proper location. When you replace a fastener, use
ONLY the exact part number for that application.
ISUZU will call out those fasteners that require a
replacement after removal. ISUZU will also call out
the fasteners that require thread lockers or thread
sealant. UNLESS OTHERWISE SPECIFIED, do not
use supplemental coatings (Paints, greases, or other
corrosion inhibitors) on threaded fasteners or
fastener joint interfaces. Generally, such coatings
adversely affect the fastener torque and the joint
clamping force, and may damage the fastener. When
you install fasteners, use the correct tightening
sequence and specifications. Following these
instructions can help you avoid damage to parts and
systems.
General Description
The hydraulic power steering system consists of a pump,
an oil reservoir, a steering gear, a pressure hose and a
return hose.
Power Steering Gear
A03RS001
The power steering gear has a recirculating ball system
which acts as a rolling thread between the worm shaft and
the rack piston. When the worm shaft is turned right, the
rack piston moves up in gear.
Turning the worm shaft left moves the rack piston down in
gear. The rack piston teeth mesh with the sector gear,
which is part of the sector shaft.
Turning the worm shaft turns the sector shaft, which turns
the wheels through the steering linkage.
The control valve in the steering gear directs the power
steering fluid to either side of the rack piston.
The rack piston converts the hydraulic pressure into a
mechanical force. If the steering system becomes
damaged and loses hydraulic pressure, the vehicle can
be controlled manually.
POWER ASSISTED SYSTEM
2A–3
Hydraulic Pump
442RV006
The hydraulic pump is a vane-type design. There are two
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.
Pressure Switch
When hydraulic pressure reaches 3650
±
350 kPa (530
±
50 psi), the pressure switch of the power steering pump
closes causing the Powertrain Control Module (PCM) to
actuate the throttle valve, which increases the engine rpm
to prevent the overload-induced engine speed slow
down. The switch opens when hydraulic pressure drops
to 3150
±
350 kPa (460
±
50 psi).
2A–4
POWER ASSISTED SYSTEM
Steering Linkage
433RS007
Legend
(1) Center Track Rod Assembly
(2) Outer Track Rod Assembly
(3) Pitman Arm
(4) Relay Lever
(5) Rod End,Outer
(6) Track Rod
(7) Rod End,Inner
The steering linkage consists of a pitman arm, relay lever,
center track rod, and two adjustable outer track rods.
When the steering wheel is turned, the gear rotates the
pitman arm which forces the center track rod to one side.
The outer track rods, connected to the center track rod by
ball studs, transfers the steering force to the wheels. The
outer track rods are adjustable and are used for toe-in
adjustments. The center track rod is supported by the
pitman arm and relay lever. The relay lever pivots on a
support attached to the frame.
The overall condition of the steering linkage affects
steering performance. If parts are bent, damaged, worn
or poorly lubricated, improper and possibly dangerous
steering action will result.
Whenever any steering linkage components are repaired
or replaced, check the steering geometry and front end
alignment. Refer to Front End Alignment Inspection and
Adjustment in this section.
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