Power Steering Pump; Hydraulic Assist - Jeep 1979 CJ-5 Technical & Service Manual

Table of Contents

STUB S H A F T SEAL

UPPER T H R U S T

V A L V E BODY SEAL RINGS

A N D BACKUP O-RINGS

P I T M A N S H A F T

Power Steering gear

In a right-turn position, the rack piston moves upward

within the gear. In a left-turn position, the rack piston

moves downward within the gear. The rack piston teeth

mesh with the pitman shaft sector teeth. The sector is

forged as an integral part of the pitman shaft. Turning

the wormshaft also turns the pitman shaft which,

through mechanical linkage, turns the wheels.

Power Steering Pump

A vane-type, constant displacement hydraulic pump

is used to develop system fluid pressure (fig. 2L-2). The

pump has an integral reservoir that contains the system

fluid supply.

The reservoir cap is vented to maintain atmospheric

pressure within the reservoir and allow air trapped in

the system to escape. A dipstick mounted in the reser-

voir cap is used to check system fluid level.

System operating pressures are maintained by a com-

bination flow control/relief valve located in the pump

(fig. 2L-2). The relief section of the valve prevents exces-,

sive system pressure buildup.

I f draulic Assist

An open center, three position, rotary-type valve body

is used to control fluid flow within the gear (fig. 2L-1).

Pump supplied fluid enters the valve body through a

pressure port in the gear housing. The valve then directs

fluid to the rack piston through passages in the housing.

The valve body, spool valve, torsion bar, and stub

shaft (which is pinned to the torsion bar) are connected

to the front wheels through mechanical linkage.

. Because of the pressure exerted on the front wheels by

vehicle weight, the wheels and valve body tend to resist

Troubleshooting