The hydraulic power steering system consists of the following
components:
Power Steering Pump
The power steering pump
(1) is a vane type, non-submerged design.The reservoir is separate from
the housing and the internal parts. The reservoir is mounted
on the cowl next to the wiper motor.
There are 2 bore openings at the rear of the pump housing. The larger
opening contains the following components:
The smaller opening contains the following components:
• | The pressure hose discharge fitting |
The pressure relief valve inside the flow control valve limits the pump
pressure.
Power Steering Gear
The power steering gear contains a recirculating ball system that acts
as a rolling thread between the worm shaft and the rack piston. The worm
shaft is supported by a pre-loaded thrust bearing and two conical
thrust races at the lower end. A bearing assembly in the adjuster
plug supports the shaft's upper end. 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, which is part of the pitman shaft. Turning the worm
shaft turns the pitman shaft, and the pitman shaft turns the wheels
through the pitman arm and 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 loses hydraulic
pressure, the vehicle can be controlled manually.
Power Steering Cooler Pipe
The power steering cooler
pipe mounts along the lower radiator support (1). In this location, air
can circulate freely around the pipe. As the vehicle is driven, heat
dissipates from the power steering fluid as it flows through the
pipe.