POWER ASSISTED SYSTEM
2A–2
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.
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
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.
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.
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.
A03RS001