Power Steering Pump - Jeep 1997 Grand Cherokee Service Manual

19 - 4 STEERING
DESCRIPTION AND OPERATION

POWER STEERING PUMP

DIAGNOSIS AND TESTING
POWER STEERING PUMP
PUMP LEAKAGE DIAGNOSIS . . . . . . . . . . . . . . 5
SERVICE PROCEDURES
POWER STEERING PUMP—INITIAL
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . 5
REMOVAL AND INSTALLATION
POWER STEERING PUMP – 5.2L/5.9L
DESCRIPTION AND OPERATION
POWER STEERING PUMP
Hydraulic pressure is provided for operation of the
power steering gear by a belt driven power steering
pump. The power steering pump is a constant flow
rate and displacement, vane-type pump. The internal
parts in the housing operate submerged in fluid. The
flow control orifice is part of the high pressure line
fitting. The pressure relief valve inside the flow con-
trol valve limits the pump pressure. The reservoir is
attached to the pump body with spring clips (Fig. 1).
The power steering pump is connected to the steer-
ing gear by the pressure and return hoses. The pump
shaft has a pressed-on drive pulley that is belt driven
by the crankshaft pulley (Fig. 1).
NOTE: Power steering pumps have different pres-
sure rates and are not interchangeable with other
pumps.
DIAGNOSIS AND TESTING
POWER STEERING PUMP
The following procedure is used to test the opera-
tion of the power steering system on the vehicle. This
test will provide the flow rate of the power steering
pump along with the maximum relief pressure. Per-
form test any time a power steering system problem
is present. This test will determine if the power
steering pump or power steering gear is not function-
ing properly. The following pressure and flow test is
performed using Power Steering Analyzer Tool kit
6815 (Fig. 2) and Adapter Kit 6893.
POWER STEERING PUMP PRESSURE TEST
(1) Check belt tension and adjust as necessary.
POWER STEERING PUMP
INDEX
page
. . . . . . . . . . . . . . . . 4
. . . . . . . . . . . . . . . . 4
. . . . . . . 6
RESERVOIRCLIP CAP PUMP BODY
POWER STEERING PUMP– 4.0L . . . . . . . . . . . . 6
DISASSEMBLY AND ASSEMBLY
PUMP PULLEY . . . . . . . . . . . . . . . . . . . . . . . . . 7
TC-SERIES PUMP RESERVOIR . . . . . . . . . . . . . 7
SPECIFICATIONS
TORQUE CHART . . . . . . . . . . . . . . . . . . . . . . . . 8
SPECIAL TOOLS
POWER STEERING PUMP
Fig. 1 TC Series Pump With Integral Reservoir
(2) Disconnect high pressure hose at gear or pump.
Use a container for dripping fluid.
(3) Connect pressure gauge from Power Steering
Analyzer Tool kit 6815 to both hoses using appropri-
ate adapter from Adapter Kit 6893. Connect spare
pressure hose to gear or pump.
(4) Open the test valve completely.
(5) Start engine and let idle long enough to circu-
late power steering fluid through flow/pressure test
gauge and to get air out of the fluid. Then shut off
engine.
FLUID VOIR (TYPICAL) RESER- HIGH-PRESSURE DRIVE PULLEY FITTING
. . . . . . . . . . . . . . . . 8
ZG
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