Jeep cherokee 2000 Service Manual page 885

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DESCRIPTION AND OPERATION
POWER STEERING PUMP . . . . . . . . . . . . . . . . . . 5
POWER STEERING PRESSURE LINE . . . . . . . . . . 5
POWER STEERING RETURN LINE . . . . . . . . . . . . 6
DIAGNOSIS AND TESTING
POWER FLOW AND PRESSURE . . . . . . . . . . . . . . 6
PUMP LEAKAGE DIAGNOSIS . . . . . . . . . . . . . . . . 7
SERVICE PROCEDURES
POWER STEERING PUMP - INITIAL
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
DESCRIPTION AND OPERATION
POWER STEERING PUMP
DESCRIPTION
Hydraulic pressure for the power steering system
is provided by a belt driven power steering pump
(Fig. 1). The pump shaft has a pressed-on high
strength plastic drive pulley that is belt driven by
the crankshaft pulley. The reservoir is attached to
the pump body with spring clips on the 4.0L engine.
A remote pump reservoir is used on the 2.5L engine
mounted to the fan shroud. The power steering pump
is connected to the steering gear by the pressure and
return hoses.
OPERATION
The power steering pump is a constant flow rate
and displacement, vane-type pump. The pump inter-
nal parts operate submerged in fluid. The flow con-
trol orifice is part of the high pressure line fitting.
The pressure relief valve inside the flow control valve
limits the pump pressure.
NOTE: Power steering pumps have different pres-
sure rates and are not interchangeable with other
pumps.
POWER STEERING PRESSURE LINE
DESCRIPTION
The hose consists of two metal ends and rubber
center section that contains a tuning cable.
POWER STEERING PUMP
TABLE OF CONTENTS
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REMOVAL AND INSTALLATION
POWER STEERING PUMP . . . . . . . . . . . . . . . . . . 7
PUMP RESERVOIR-2.5L . . . . . . . . . . . . . . . . . . . . 7
DISASSEMBLY AND ASSEMBLY
PUMP PULLEY . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
PUMP RESERVOIR . . . . . . . . . . . . . . . . . . . . . . . . 8
SPECIFICATIONS
TORQUE CHART . . . . . . . . . . . . . . . . . . . . . . . . . 10
SPECIAL TOOLS
POWER STEERING PUMP . . . . . . . . . . . . . . . . . 10
Fig. 1 Pump With Integral Reservoir
1 - CAP
2 - FLUID RESERVOIR (TYPICAL)
3 - HIGH-PRESSURE FITTING
4 - DRIVE PULLEY
5 - PUMP BODY
6 - RESERVOIR CLIP
OPERATION
Power steering pressure line, is used to transfer
high pressure power steering fluid, from the power
steering pump to the power steering gear.
STEERING 19 - 5
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