Power Steering Pump; Power Steering Pump Pressure Test; Pump Pressure Test - Jeep Wrangler 1997 Manual

19- 4
STEERING
REMOVAL AND INSTALLATION
POWER STEERING PUMP . . . . . . . . . . . . . . . . . 6
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 on the
4.0 L engine . On the 2.5 L engine the reservoir is
separate from the pump . It is mounted to the fan
shroud .
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
page
POWER STEERING PUMP PRESSURE TEST
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
POWER STEERING PUMP
INDEX
TJ
page
POWER STEERING PUMP . . . . . . . . . . . . . . . . . 8
FLUID
HIGH-PRESSURE
RESERVOIR
FITTING
(TYPICAL)
Fig. 1 Typical TC Series Pump With Integral
Reservoir
DRIVE
PULLEY
performed using Pressure/Flow tester, Special Tool
6815 (Fig. 2).
PUMP PRESSURE TEST
(1)
Check belt tension and adjust as necessary.
(2) Disconnect high pressure hose at gear or pump .
Use a container for dripping fluid .
(3) Connect Pressure Gauge/Flow Meter Tool 6815
between the pump pressure fitting and pressure hose
using adapters from Adapter Kit 6893 .
(4) Open the test valve completely.
(5) Start engine and let idle long enough to circu-
late power steering fluid through flow/pressure test
DESCRIPTION AND OPERATION
POWER STEERING PUMP . . . . . . . . . . . . . . . . .
DIAGNOSIS AND TESTING
POWER STEERING PUMP PRESSURE TEST . . .
4
4
PUMP REMOTE RESERVOIR-2.5L . . . . . . . . . . . 6
DISASSEMBLY AND ASSEMBLY
FLOW CONTROL VALVE . . . . . . . . . . . . . . . . . . . 8
TC-SERIES PUMP PULLEY . . . . . . . . . . . . . . . . . 7
PUMP LEAKAGE DIAGNOSIS . . . . . . . . . . . . . . . 5
TC-SERIES PUMP RESERVOIR . . . . . . . . . . . . . . 7
SERVICE PROCEDURES
SPECIFICATIONS
POWER STEERING PUMP-INITIAL
TORQUE CHART . . . . . . . . . . . . . . . . . . . . . . . . . 8
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
SPECIAL TOOLS