JEEP CHEROKEE 1995 Service Repair Manual

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.
Power steering pumps have different pres-
sure rates and are not interchangeable with
other pumps.
The power steering pump is connected to the steer-
ing gear via high pressure and return hose. The
pump shaft has a pressed-on drive pulley that is belt
driven by the crankshaft pulley (Fig. 3).
XJ vehicles with 2.5L engines and all YJ vehicles:
The reservoir is mounted at the front left side of the
engine compartment. XJ vehicles equipped with a
4.0L engine have the reservoir attached to the pump
body with spring clips.
STEERING COLUMNS
Two general types of steering columns are installed
on Jeep vehicles: a fixed, non-tilt column and a tilt
column (Fig. 4).
The ignition key/lock cylinder is located in the
steering column. When the key/lock cylinder is
turned to the LOCK position, the ignition switch and
steering shaft cannot be operated. For vehicles withan automatic transmission, the lock mechanism also
prevents operation of the gear shift mechanism.
The center, slip-type intermediate shaft is attached
to the steering gear and steering column shaft with
universal joints.
Both types of steering columns have anti-theft pro-
visions. They are energy-absorbing.
Fig. 2 Ratio Code Location
Fig. 3 TC Series Pump With Integral Reservoir
Fig. 4 Steering Columns
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POWER STEERING SYSTEM DIAGNOSIS
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 Gauge 7617 to both hoses using
adapter fitting (Fig. 1). Connect spare pressure hose
to gear or pump.
(4) Open the test valve completely.
(5) Start engine and let idle.
(6) Check fluid level, add fluid as necessary.
(7) Gauge should read below 862 kPa (125 psi), if
above, inspect the hoses for restrictions and repair as
necessary. The initial pressure should be in the range
of 345-552 kPa (50-80 psi).CAUTION: The following test procedure involves
testing maximum pump pressure output and flow
control valve operation. Do not leave valve closed
for more than 5 seconds as the pump could be
damaged.
(8) Close valve fully three times and record highest
pressure indicated each time.All three readings
must be above specifications and within 345
kPa (50 psi) of each other.
²Pressures above specifications but not within 345
kPa (50 psi) of each other, replace pump.
²Pressures within 345 kPa (50 psi) of each other
but below specifications, replace pump.
CAUTION: Do not force the pump to operate against
the stops for more than 2 to 4 seconds at a time.
Pump damage will result.
(9) Open the test valve, turn steering wheel ex-
treme left and right positions against the stops.
Record the highest indicated pressure at each posi-
tion. Compare readings to specifications. If highest
output pressures are not the same against either
stop, the gear is leaking internally and must be re-
paired.
Fig. 1 Pressure Test Gauge
PUMP OPERATING SPECIFICATIONS
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POWER STEERING SYSTEM DIAGNOSIS
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POWER STEERING SYSTEM DIAGNOSIS
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POWER STEERING SYSTEM DIAGNOSIS
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POWER STEERING SYSTEM DIAGNOSIS
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POWER STEERING SYSTEM DIAGNOSIS
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POWER STEERING SYSTEM DIAGNOSIS
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PUMP LEAKAGE DIAGNOSISGEAR LEAKAGE DIAGNOSIS
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POWER STEERING PUMP
INDEX
page page
Drive Pulley Replacement................... 13
Flow Control Valve Fitting O-Ring Seal......... 14
Power Steering PumpÐInitial Operation........ 15
Pressure and Return Hose Replacement........ 11Pump Replacement........................ 12
Reservoir Replacement..................... 14
Service Information........................ 11
SERVICE INFORMATION
The power steering pump internal components are
not serviced or adjusted. If a malfunction or an inter-
nal fluid leak occurs, the complete unit must be re-
placed. A reservoir, cap, and O-ring seal kit are the
only service components available.
PRESSURE AND RETURN HOSE REPLACEMENT
Cap hose open ends and pump/steering gear fit-
tings to prevent entry of foreign material.
WARNING: POWER STEERING FLUID (AND PUMP
COMPONENTS) AND THE EXHAUST SYSTEM CAN
BE EXTREMELY HOT IF THE ENGINE HAS BEEN
RECENTLY OPERATING. DO NOT START THE EN-
GINE WITH ANY LOOSE OR DISCONNECTED
HOSES. DO NOT ALLOW THE HOSES TO TOUCH A
HOT EXHAUST MANIFOLD OR THE CATALYTIC
CONVERTER.
REMOVAL
(1) Remove fasteners from hose retaining brackets
at all locations.
(2) If applicable, remove pressure sensor from
pressure hose (Fig. 1, 2).
(3) Disconnect pressure and return hose from the
steering gear. Drain the fluid from pump and reser-
voir (Fig. 1, 2, 3).
(4) Disconnect pressure and return hose from the
pump. Remove hoses from vehicle (Fig. 1, 2, 3).
INSTALLATION
(1) Wipe hose ends, pump and gear unions clean.
(2) Connect hose at steering gear and pump. Route
hose while avoiding extreme bends or kinks.The
hose must be kept away from exhaust system
components.Do not distort hose tube ends by bend-
ing, kinking or over tightening.
(3) If applicable, install and tighten pressure sen-
sor to 28 Nzm (252 in. lbs.) torque (Fig. 1, 2).
(4) When used, the protective foam sleeves must be
properly positioned on the hose to prevent chafing.
Fig. 1 Power Steering HoseÐYJ
JSTEERING 19 - 11