1994 JEEP CHEROKEE power steering fluid

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 with
an 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. 3 TC Series Pump With Integral Reservoir
Fig. 4 Steering Columns
Fig. 2 Ratio Code Location
19 - 2 STEERINGJ

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 (J21567) to both hoses us-
ing 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
JSTEERING 19 - 3

POWER STEERING PUMP
INDEX
page page
Drive Pulley Replacement.................. 11
Flow Control Valve Fitting O-Ring Seal........ 12
Power Steering PumpÐInitial Operation....... 13
Pressure and Return Hose Replacement........ 9Pump Replacement....................... 10
Reservoir Replacement.................... 12
Service Information........................ 9
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.
(5) Tighten fittings at pump and gear to 35 Nzm
(25 ft. lbs.) torque.
(6) Install clamps on return hose on gear, pump
and reservoir.
Fig. 1 Power Steering Hose YJ
JSTEERING 19 - 9

(7) After installation, inspect and test for fluid
leaks.
PUMP REPLACEMENT
REMOVAL
CAUTION: The drive belt tension must be released
before removing the pump. If the belt is not loos-
ened, the pump pulley could be damaged.
(1) Remove serpentine drive belt. Refer to Group 7,
Cooling for additional information.
(2) Place a drain pan under pump.
(3) Remove pressure and return hoses from pump.
Refer to Pressure and Return Hose Replacement in
this section.
(4) Remove 2 rear bracket-to-pump bolts (Fig. 4).
(5) Remove lower nut at adjustment bracket.
(6) Remove adjuster bolt.
(7) Remove upper pivot bolt.
(8) Tilt pump forward and remove pump and front
bracket assembly from engine bracket.
(9) Remove adjuster collar at lower stud on pump
bracket.
(10) Remove pulley from pump. Refer to Drive Pul-
ley Replacement in this section (Fig. 5).
(11) Remove 3 front bracket-to-pump bolts.
Fig. 2 Power Steering Hose XJ 4 Cylinder
Fig. 3 Power Steering Hose XJ 6 Cylinder
19 - 10 STEERINGJ

INSTALLATION
(1) Install 3 front bracket-to-pump bolts. Tighten
to 28 Nzm (21 ft. lbs.) torque.
(2) Install pulley on pump. Refer to Drive Pulley
Replacement in this section (Fig. 6).
(3) Install adjuster collar on adjuster bracket stud
(Fig. 4).
(4) Tilt pump forward and install pump onto en-
gine bracket.
(5) Install upper pivot bolt.
(6) Install lower adjuster bolt.
(7) Install lower adjuster stud nut.
(8) Install 2 rear engine bracket to pump bolts.
Tighten to 28 Nzm (21 ft. lbs.) torque.
(9) Install the serpentine drive belt. Refer to Group
7, Cooling for additional information.
(10) Install the pressure and return hoses to
pump. Refer to Pressure and Return Hose Replace-
ment in this section.
(11) Add power steering fluid. Refer to Power
Steering Pump Initial Operation in this section.
DRIVE PULLEY REPLACEMENT
REMOVAL
(1) Remove power steering pump. Refer to Pump
Replacement in this section.(2) Remove the drive pulley with Puller C-4333 (J-
25034-B) (Fig. 5).
Do not hammer on any part of drive pulley,
damage will occur to the pump and pulley.
INSTALLATION
(1) Install the pulley with Installer C-4063 (J-
25033-B) (Fig. 6). Do not use the tool adapters.
Fig. 4 Pump Mounting (4.0L I-6)
Fig. 5 Remove Drive Pulley (Typical)
JSTEERING 19 - 11

(2) Be sure tool and pulley remain aligned and
NOT cocked with the pump shaft.
(3) Press the pulley on flush with end of pump
shaft (Fig. 7).
(4) Install power steering pump. Refer to Pump
Replacement in this section.
With Serpentine Belts; Run engine until warm (5
min.) and note any belt chirp. If chirp exists, move
pulley outward approximately 0.5 mm (0.020 in.). If
noise increases, press on 1.0 mm (0.040 in.).Be
careful that pulley does not contact mounting
bolts.
RESERVOIR REPLACEMENT
REMOVAL
(1) Remove power steering pump. Refer to Pump
Replacement in this section.
(2) Clean exterior of pump with solvent.
(3) Clamp the pump body in a soft jaw vice.
(4) Pry up tab and slide the retaining clip off (Fig.
8).
(5) Remove fluid reservoir from pump body. Re-
move and discard O-ring seal (Fig. 9).
INSTALLATION
(1) Lubricate new O-ring Seal with Mopar Power
Steering Fluid or equivalent.
(2) Install O-ring seal in housing.
(3) Install reservoir onto housing.
(4) Slide and tap in reservoir retainer clips until
tab locks to housing.
(5) Install power steering pump. Refer to Pump Re-
placement in this section.
FLOW CONTROL VALVE FITTING O-RING SEAL
REMOVAL
(1) Clean area around fitting to prevent dirt from
entering pump. Remove pressure hose from pump fit-
ting.
Fig. 8 Remove Reservoir Clips (Typical)
Fig. 9 Remove Reservoir (Typical)
Fig. 6 Install Drive Pulley (Typical)
Fig. 7 Pump Shaft Location
19 - 12 STEERINGJ

(2) Remove fitting from pump housing (Fig. 10).
Prevent flow control valve and spring from
sliding out of housing bore.
(3) Remove and discard O-ring seal.
INSTALLATION
(1) If necessary, clean and install flow control valve
and spring in pump housing bore.Be sure the hex
nut end of the valve is facing in toward pump.
(2) Install O-ring seal onto fitting (Fig. 10).(3) Install flow control valve in pump housing and
tighten to 75 Nzm (55 ft. lbs.) torque.
(4) Install pressure hose to valve.
POWER STEERING PUMPÐINITIAL OPERATION
CAUTION: The fluid level should be checked with
engine off to prevent injury from moving compo-
nents. Use only Mopar Power Steering Fluid. Do not
use automatic transmission fluid. Do not overfill.
Wipe filler cap clean, then check the fluid level.
The dipstick should indicate FULL COLD when the
fluid is at normal temperature 21ÉC to 27ÉC (70ÉF to
80ÉF).
(1) Fill the pump fluid reservoir to the proper level
and let the fluid settle for at least two (2) minutes.
(2) Start the engine and let run for a few seconds.
Then turn the engine off.
(3) Add fluid if necessary. Repeat the above proce-
dure until the fluid level remains constant after run-
ning the engine.
(4) Raise the front wheels off the ground.
(5) Start the engine. Slowly turn the steering
wheel right and left, lightly contacting the wheel
stops.
(6) Add power steering fluid if necessary.
(7) Lower the vehicle and turn the steering wheel
slowly from lock to lock.
(8) Stop the engine. Check the fluid level and refill
as required.
(9) If the fluid is extremely foamy, allow the vehi-
cle to stand a few minutes and repeat the above pro-
cedure.
Fig. 10 Flow Control Valve Fitting
JSTEERING 19 - 13

PITMAN SHAFT SEALSÐIN CAR REPLACEMENT
REMOVAL
(1) Remove pitman arm from gear. Refer to Pit-
man Arm Removal in Steering Linkage.
(2) Clean exposed end of pitman shaft and housing.
Use a wire brush to clean the shaft splines.
(3) Remove retaining ring with snap ring pliers
(Fig. 2).
CAUTION: Use care not to score the housing bore
when prying out seals and washers.
(4) Remove backup washer and double lip seal
with screwdriver.
²Start the engine and turn the steering wheel fully
to the LEFT to force out the seals and washers.
²Stop the engine
(5) Remove backup washer and single lip seal with
screwdriver.
(6) Inspect the housing for burrs and remove if
necessary. Inspect the pitman shaft seal surface for
roughness and pitting. If pitted replace shaft.
INSTALLATION
(1) Install single lip seal with Installer or a suit-
able size deep socket (Fig. 3).
(2) Coat the double lip seal and washer with
grease.
(3) Install the backup washer.
(4) Install the double lip seal.
(5) Install the backup washer.
(6) Install the retainer ring with snap ring pliers.
(7) Center the steering gear.
(8) Install the pitman arm. Refer to Pitman Arm
Installation in Steering Linkage.(9) Add power steering fluid. Refer to Power Steer-
ing Initial Operation.
INTERMEDIATE (COUPLING) SHAFT
REMOVAL
(1) Place the front wheels in the straight ahead po-
sition.
(2) Remove the shaft pinch bolt at the steering
gear and column (Fig. 4, 5). Unbolt steering gear
from frame rail to remove shaft. Refer to Steering
Gear Replacement in this section.
INSTALLATION
(1) Align the intermediate (coupler) shaft to the
steering gear and column.
(2) Position the steering gear on the frame. Refer
to Steering Gear Replacement in this section.
(3) Install and tighten the pinch bolts to 34 Nzm
(25 ft. lbs.) torque.
STEERING GEAR REPLACEMENT
REMOVAL
(1) Place the front wheels in the straight ahead po-
sition with the steering wheel centered.
(2) Disconnect and cap the fluid hoses from steer-
ing gear. Refer to Pressure and Return Hose Replace-
ment in this Group.
(3) Remove the column coupler shaft from the gear.
Refer to the removal procedures in this section.
(4) Remove pitman arm from gear. Refer to Pitman
Arm Removal in the Steering Linkage section.
Fig. 2 Pitman Shaft Seals
Fig. 3 Pitman Shaft Seal Installation
JSTEERING 19 - 21