1994 JEEP CHEROKEE front

(8) If the vibration decreased, install a second
clamp (Fig. 2) and repeat the test.
(9) If the clamps cause an additional unbalance,
separate the clamps (1/4 inch above and below the
mark). Repeat the vibration test (Fig. 3).(10) Increase distance between the clamp screws
and repeat the test until the amount of vibration is
at the lowest level. Bend the slack end of the clamps
so the screws will not loosen.
(11) Install the wheel and tires. Lower the vehicle.
(12) If the amount of vibration remains unaccept-
able, apply procedures at the front end of the propel-
ler shaft.
RUNOUT
(1) Remove dirt, rust, paint, and undercoating
from the propeller shaft surface. Areas where the
dial indicator will contact the shaft must be clean.
(2) The dial indicator must be installed perpendic-
ular to the shaft surface.
(3) Measure runout at the center and ends away
from welds.
(4) Refer to Runout Specifications chart.
(5) Replace the propeller shaft if the runout ex-
ceeds the limit.
UNIVERSAL JOINT ANGLE MEASUREMENT
INFORMATION
When two shafts come together at any common
joint, the bend that is formed is called the operating
angle. The larger the angle, the larger the amount of
acceleration and deceleration of the joint. This speed-
ing up and slowing down of the joint must be can-
celled to produce a smooth power flow. This is done
through phasing and proper universal joint working
angles.
A propeller shaft is properly phased when the yoke
ends are on the same plane or in line. A twisted
shaft will throw the yokes out of phase and cause a
noticeable vibration.
When taking universal joint angle measurements
or checking phasing with two piece shafts, consider
each shaft separately. On 4WD vehicles, the front
shaft input (pinion shaft) angle has priority over the
caster angle.
Ideally the driveline system should have;
²Angles that are in equal or opposite within 1 de-
gree of each other
Fig. 1 Clamp Screw At Position 1
Fig. 2 Two Clamp Screws At The Same Position
Fig. 3 Clamp Screws Separated
RUNOUT SPECIFICATIONS
16 - 4 PROPELLER SHAFTSJ

²Have a 3 degree maximum operating angle
²Have at least a 1/2 degree continuous operating
(propeller shaft) angle
Engine speed (R.P.M.) is the main factor though in
determining maximum allowable operating angles.
As a guide to maximum normal operating angles re-
fer to the chart listed (Fig. 4).
INSPECTION
Before measuring universal joint angles, the
following must be done.
²Inflate all tires to correct pressure
²Check angles in the same loaded or unloaded con-
dition as when the vibration occurred. Propshaft an-
gles will change according to the amount of load in
the vehicle. Always check angles in loaded and un-
loaded conditions.
²Check the condition of all suspension components
and verify all fasteners are torqued to specifications.
²Check the condition of the engine and transmis-
sion mounts and verify all fasteners are torqued to
specifications.
MEASUREMENT
To accurately check driveline alignment, raise and
support the vehicle at the axles as level as possible.
Allow the wheels and propeller shaft to turn. Remove
any external bearing snap rings (if equipped) from
universal joint so protractor base sits flat.
(1) Rotate the shaft until transmission/transfer
case output yoke bearing is facing downward.
Always make measurements from front to
rear.
(2) Place Inclinometer on yoke bearing (A) parallel
to the shaft (Fig. 5). Center bubble in sight glass and
record measurement.
This measurement will give you the transmis-
sion or OUTPUT YOKE ANGLE (A).
(3) Rotate propeller shaft 90 degrees and place In-
clinometer on yoke bearing parallel to the shaft (Fig.
6). Center bubble in sight glass and record measure-
ment. This measurement can also be taken at the
rear end of the shaft.
This measurement will give you the PROPEL-
LER SHAFT ANGLE (C).(4) Subtract smaller figure from larger (C minus A)
to obtain transmission OUTPUT OPERATING AN-
GLE.
(5) Rotate propeller shaft 90 degrees and place In-
clinometer on pinion yoke bearing parallel to the
shaft (Fig. 7). Center bubble in sight glass and record
measurement.
This measurement will give you the pinion
shaft or INPUT YOKE ANGLE (B).
(6) Subtract smaller figure from larger (C minus
B) to obtain axle INPUT OPERATING ANGLE.
Refer to rules given below and the example in (Fig.
8) for additional information.
Fig. 4 Maximum Angles and R.P.M.
Fig. 5 Front (Output) Angle Measurement (A)
Fig. 6 Propeller Shaft Angle Measurement (C)
JPROPELLER SHAFTS 16 - 5

ADJUSTMENTÐXJ FRONT SHAFT
Adjust the pinion gear angle at the lower suspen-
sion arms with shims (Fig. 10). Adding shims will de-
crease the pinion gear shaft angle but will increase
the caster angle. The pinion gear shaft angle has pri-
ority over the caster angle.
PROPELLER SHAFT REPLACEMENT
PRECAUTIONS
Use exact replacement hardware for attaching the
propeller shafts. Exact replacement will ensure safe
operation. The specified torque must always be ap-
plied when tightening the fasteners.
Put reference marks on the propshaft yoke and axle
or transmission yoke before service (Fig. 1). This will
assure correct phasing and eliminate possible vibration.
CAUTION: Do not allow the propeller shaft to drop
or hang from either universal joint during removal.
Attach it to the vehicle underside with wire to pre-
vent damage to the universal joints.CAUTION: It is very important to protect the ma-
chined, external surface of the slip yoke from dam-
age after propeller shaft removal. If damaged, the
transmission extension seal could be damaged and
cause a leak.
FRONTÐXJ VEHICLES
REMOVAL
(1) Raise the vehicle.
(2) Scribe alignment marks on the yokes at the
transfer case. Place marks at the pinion shaft and at
each end of the propeller shaft. These marks will be
used for installation reference (Fig. 2).
(3) Remove the U-joint strap bolts at the pinion
shaft yoke.
(4) Disconnect the propeller shaft at the transfer
case and remove the propeller shaft.
INSTALLATION
(1) Position the propeller shaft with the yoke refer-
ence marks aligned (Fig. 1). Install the propeller
shaft.
Replacement U-joint straps and bolts must be
installed.
(2) Tighten the U-joint strap/clamp bolts at the
axle yoke to 19 Nzm (14 ft. lbs.) torque.
(3) Tighten the flange to transfer case bolts to 27
Nzm (19.5 ft. lbs.) torque.
(4) Lower the vehicle.
Fig. 10 Angle AdjustmentÐXJ Vehicles
Fig. 1 Reference Marks on Yokes
JPROPELLER SHAFTS 16 - 7

REARÐXJ,YJ VEHICLES
REMOVAL
(1) Shift the transmission and transfer case (if ap-
plicable) to their Neutral positions. Raise the vehicle.
(2) Scribe alignment marks at the pinion shaft and
at each end of the propeller shaft. These marks will
be used for installation reference.
(3) Remove the U-joint strap bolts at the pinion
shaft yoke.
(4) Slide the slip yoke off of the transmission/
transfer case output shaft and remove the propeller
shaft (Fig. 3).
INSTALLATION
(1) Slide the slip yoke on the transmission/transfer
case output shaft. Align the installation reference
marks at the axle yoke and install the propeller shaft
(Fig. 3).
Replacement U-joint straps and bolts must be
installed.
(2) Tighten the U-joint strap/clamp bolts at the
axle yoke to 19 Nzm (14 ft. lbs.) torque.
(3) Lower the vehicle.
FRONTÐYJ VEHICLES
REMOVAL
(1) Raise the vehicle.
(2) Scribe alignment marks on the yokes at the
transfer case. Place marks at the pinion shaft and at
each end of the propeller shaft. These marks will be
used for installation reference (Fig. 4).(3) Remove the U-joint strap bolts at the pinion
shaft yoke.
(4) Disconnect the propeller shaft at the transfer
case and remove the propeller shaft.
INSTALLATION
(1) Position the propeller shaft with the reference
marks aligned (Fig. 4). Install the propeller shaft.
Replacement U-joint straps and bolts must be
installed.
(2) Tighten the U-joint strap/clamp bolts at the
axle yoke to 19 Nzm (14 ft. lbs.) torque.
(3) Tighten the U-joint strap/clamp to transfer case
bolts to 27 Nzm (19.5 ft. lbs.) torque.
(4) Tighten the U-joint strap bolts to 19 Nzm (14 ft.
lbs.) torque.
(5) Lower the vehicle.
Fig. 3 Rear Propeller Shaft
Fig. 4 YJ Front Propeller Shaft
Fig. 2 Front Propeller Shaft
16 - 8 PROPELLER SHAFTSJ

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

(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) 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