Power Steering - Jeep Wrangler 1999 Electronic Service Manual

TJ

POWER STEERING . . . . . . . . . . . . . . . . . . . . . . . . 1

POWER STEERING GEAR . . . . . . . . . . . . . . . . . . 11
POWER STEERING PUMP . . . . . . . . . . . . . . . . . . 6
DESCRIPTION AND OPERATION
STEERING SYSTEM . . . . . . . . . . . . . . . . . . . . . . 1
DIAGNOSIS AND TESTING
POWER STEERING FLOW AND PRESSURE . . . . 4
DESCRIPTION AND OPERATION
STEERING SYSTEM
This vehicle has manual steering or optional power
steering. The power steering system has a hydraulic
pump. The pump is a constant flow rate and dis-
placement vane-type pump. The pump reservoir on
the 4.0L engine is mounted to the pump body (Fig.
1). The 2.5L engine has a remote pump reservoir
mounted to the fan shroud (Fig. 2).
The steering gear used is a recirculating ball type
gear. The gear acts as a rolling thread between the
worm shaft and rack piston. The worm shaft is sup-
ported by a thrust bearing at the lower end and a
bearing assembly at the upper end. When the worm
shaft is turned the rack piston moves. The rack pis-
ton teeth mesh with the pitman shaft. Turning the
worm shaft turns the pitman shaft, which turns the
steering linkage.
The power steering system consists of:
• Hydraulic pump
• Recirculating ball steering gear
• Steering column
• Steering linkage
STEERING
CONTENTS
page
STEERING COLUMN . . . . . . . . . . . . . . . . . . . . . . 25
STEERING LINKAGE . . . . . . . . . . . . . . . . . . . . . . 22
POWER STEERING
INDEX
page
POWER STEERING SYSTEM DIAGNOSIS
CHARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Fig. 1 Power Steering Gear & Pump – 4.0L
Fig. 2 Power Steering Gear & Pump – 2.5L
STEERING 19 - 1
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