1994 JEEP CHEROKEE steering

(7) Install stub shaft and valve assembly to worm
shaft, fitting on worm shaft to slot in the valve as-
sembly.
(8) Adjust Thrust Bearing Preload Adjustment and
Over-Center Adjustment. Refer to Steering Gear Ad-
justments in this section.
INSTALL
(1) Install steering gear. Refer to Power Steering
Gear Replacement in this section.
RACK PISTON AND WORM SHAFT REPLACEMENT
REMOVE
(1) Remove steering gear from vehicle. Refer to
Power Steering Gear Replacement in this section.
DISASSEMBLE
(1) Remove pitman shaft and side cover. Refer to
Side Cover and Pitman Shaft Replacement in this
section.
(2) Remove housing plug end. Refer to Housing
End Plug Replacement in this section.
(3) Turn stub shaft COUNTERCLOCKWISE until
the rack piston begins to come out of the housing.
(4) Remove rack piston plug (Fig. 30).
(5) Insert Arbor C-4175 (J-21552) into bore of rack
piston (Fig. 31). Hold tool tightly against worm shaft
while turning the stub shaft COUNTERCLOCK-
WISE.
²The rack piston will be forced onto the tool and
hold the rack piston balls in place.
(6) Remove the rack piston, rack balls, and tool to-
gether from housing.
(7) Remove valve. Refer to Valve Replacement in
this section.
(8) Remove worm shaft.
(9) Remove thrust bearing and races.
(10) Remove tool from rack piston.
(11) Remove rack piston balls.
(12) Remove screws, clamp and ball guide.
(13) Remove teflon ring and O-ring seal (Fig. 32).
Fig. 28 Remove and Install Valve Seals
Fig. 29 Stub Shaft Installation
Fig. 30 Remove and Install Rack Piston End Plug
19 - 30 STEERINGJ

CLEAN AND INSPECTION
(1) Wash all components in clean solvent and dry
with compressed air.
(2) Check for scores, nicks or burrs on the rack pis-
ton finished surface. Slight wear is normal on the
worm gear surfaces.
ASSEMBLE
(1) Install O-ring seal and teflon ring and lubricate
with power steering fluid.
(2) Install worm shaft to rack piston outside of
housing. Fully seat worm shaft to rack piston and
align worm shaft spiral groove with rack piston ball
guide hole (Fig. 33).
WARNING: MAKE SURE ALL RACK PISTON BALLS
ARE REINSTALLED IN THE RACK PISTON. IM-
PROPER INSTALLATION MAY RESULT IN PER-
SONAL INJURY.There are 24 balls in the rack piston circuit,
12 are black and 12 are silver (Chrome). The
black rack piston balls are smaller than the sil-
ver balls. THE BLACK AND SILVER BALLS
MUST BE INSTALLED ALTERNATELY INTO
THE RACK PISTON AND BALL GUIDE. This
procedure will maintain worm shaft preload.
(3) Lubricate and install rack piston balls through
return guide hole while turning wormshaft COUN-
TERCLOCKWISE.
(4) Install remaining balls to guide using grease or
petroleum jelly at each end to hold in place (Fig. 34).
(5) Install guide onto rack piston and return with
clamp and screws. Tighten screws to 58 Nzm (43 in.
lbs.) torque.
(6) Insert Arbor C-4175 (J-21552) into bore of rack
piston. Hold tool tightly against worm shaft while
Fig. 34 Balls in the Return Guide
Fig. 31 Remove and Install Rack Piston
Fig. 32 Remove and Install Seal on Rack Piston
Fig. 33 Installing Balls in Rack Piston
JSTEERING 19 - 31

turning the stub shaft COUNTERCLOCKWISE.
²The rack piston will be forced onto the tool and
hold the rack piston balls in place.
(7) Install the races and thrust bearing to worm
shaft (Fig. 35).
(8) Install worm shaft to housing.
(9) Install valve. Refer to Valve Replacement in
this section.
(10) Install rack piston to worm shaft from tool,
compress seals.
²Hold Arbor tightly against worm shaft and turn
stub shaft CLOCKWISE until rack piston is seated
on worm shaft.
WARNING: MAKE SURE ALL RACK PISTON BALLS
ARE REINSTALLED IN THE RACK PISTON. IM-
PROPER INSTALLATION MAY RESULT IN PER-
SONAL INJURY.
(11) Install rack piston plug and tighten to 150
Nzm (111 ft. lbs.) torque.
(12) Install housing end plug. Refer to Housing
End Plug Replacement in this section.
(13) Install pitman shaft and side cover. Refer to
Side Cover and Pitman Shaft Replacement in this
section.
(14) Adjust steering gear. Refer to Steering Gear
Adjustments in this section.
INSTALL
(1) Install steering gear. Refer to Power Steering
Gear Replacement in this section.
PITMAN SHAFT SEALS AND BEARING
REPLACEMENT
REMOVE
(1) Remove steering gear from vehicle. Refer to
Power Steering Gear Replacement in this section.
DISASSEMBLE
(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. 36).
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.
(5) Remove backup washer and single lip seal with
screwdriver.
(6) Inspect the housing for burrs and remove if
necessary.
(7) Remove needle bearing from side cover area of
housing (Fig. 37).
ASSEMBLE
(1) Install needle bearing into housing (Fig. 38).
(2) Install single lip seal with Installer or a suit-
able size socket (Fig. 39).
(3) Coat the double lip seal and washer with
grease.
(4) Install the backup washer.
(5) Install the double lip seal.
(6) Install the backup washer.
Fig. 36 Pitman Shaft Seals
Fig. 35 Worm Shaft and Bearing
19 - 32 STEERINGJ

(7) Install the retainer ring with snap ring pliers.(8) Install the pitman shaft and side cover. Refer
to Side Cover and Pitman Shaft Replacement in this
section.
INSTALL
(1) Install steering gear. Refer to Power Steering
Gear Replacement in this section.
CHECK VALVE REPLACEMENT
REMOVE
(1) Remove steering gear from vehicle. Refer to
Power Steering Gear Replacement in this section.
DISASSEMBLE
CAUTION: Use care not to damage the threads of
the housing when prying out check valve.
(1) Remove valve by prying from housing with a
small screwdriver.
ASSEMBLE
(1) Install the valve into the housing with a 3/8-
inch diameter piece of tubing 100 mm (4 inches)
long.
INSTALL
(1) Install steering gear. Refer to Power Steering
Gear Replacement in this section.
Fig. 37 Needle Bearing Removal
Fig. 38 Pitman Shaft Bearing Installation
Fig. 39 Pitman Shaft Seal Installation
JSTEERING 19 - 33

POWER STEERING GEAR SPECIFICATIONS
19 - 34 STEERINGJ

MANUAL STEERING GEAR
INDEX
page page
Diagnosis.............................. 35
Gear Adjustments in Vehicle................ 37
Gear Adjustments on Bench................ 42
Gear Assembly.......................... 41
Gear Cleaning and Inspection............... 40Gear Disassembly........................ 37
Information............................. 35
Intermediate (Coupler) Shaft................ 43
Pitman Shaft Seal Replacement............. 35
Steering Gear Replacement................. 43
INFORMATION
The manual steering gear installed on Jeep vehi-
cles (Fig. 1) has a variable steering ratio.
DIAGNOSIS
PITMAN SHAFT SEAL REPLACEMENT
REMOVAL
(1) Mark pitman arm and shaft positions for refer-
ence. Remove pitman arm with Puller 7998 (J6632-
01).
(2) Remove the pitman shaft seal with a small
blade screw driver.
INSPECTION
(1) Inspect the condition of the steering gear lubri-
cant. If contaminated (contains metal particles), re-
move and overhaul the steering gear.
INSTALLATION
(1) Lubricate the new seal with chassis lubricant.
CAUTION: A protective wrap must be used on the
shaft threads/splines during seal installation. If the
shaft seals are installed over exposed shaft, the
seal lips could be cut or distorted. This can result
in leakage after installation.
Fig. 1 Manual Steering Gear
JSTEERING 19 - 35

MANUAL STEERING SYSTEM DIAGNOSIS
19 - 36 STEERINGJ

(2) Wrap a single layer of plastic tape around the
pitman shaft threads and splines. This will protect
the replacement seals during installation.
(3) Install the seal with a suitable size socket.
(4) Remove the tape from the shaft.
(5) Center the steering gear.
(6) Align and install the pitman arm.
(7) Install the washer and retaining nut on the pit-
man shaft. Tighten the nut to 251 Nb1m (185 ft. lbs.)
torque.
GEAR ADJUSTMENTS IN VEHICLE
REMOVE
(1) Raise and support the vehicle.
(2) Mark the pitman shaft and pitman arm for in-
stallation reference. Remove the pitman arm from
the shaft.
(3) Loosen the adjuster lock nut then back the ad-
juster plug off 1/4 turn.
(4) Remove the steering wheel horn pad.
(5) Turn the steering wheel in one direction until
stopped by the gear. Then turn back 1/2 turn.
CAUTION: Do not turn the steering wheel hard
against the internal stops when the linkage is re-
moved. This could result in damage to the recircu-
lating ball guides.
MEASURE
Place a low calibration (50 in. lbs.) torque wrench
and socket on the steering wheel nut. Rotate the
wrench and nut through a 90 degree arc (1/4 turn).
This will measure the worm shaft bearing preload.
ADJUST WORMSHAFT BEARING PRELOAD
TORQUE
(1) Adjust the preload by tightening the adjuster
plug. The preload should be 0.6 to 1 Nzm(5to8in.
lbs.) torque.
Steering column/shaft misalignment or damage will
increase the amount of torque required to rotate the
steering wheel. If the rotating torque is exceptionally
high, inspect the steering column/shaft alignment. If
the alignment is correct, remove the steering gear,
determine the cause of the high preload torque, and
repair as necessary.
(2) Tighten the adjuster locknut to 68 Nzm (50 ft.
lbs.) torque. Measure the preload torque. If neces-
sary, adjust the preload torque again.
ADJUST OVERCENTER DRAG TORQUE
(1) Turn the steering wheel from one stop to the
other and count the total numbers of turns. Turn the
wheel back in reverse direction 1/2 the total number
of turns to center the steering gear.
(2) Turn the over center adjusting screw in to re-
move all lash between the ball nut and pitman shaftsector teeth. Hold the adjustment screw and tighten
the lock nut to 34 Nzm (25 ft. lbs.) torque.
(3) Check the torque at the steering wheel by tak-
ing the highest reading as the wheel is turned
through the center position.
(4) The overcenter drag torque should be 0.5 to 1
Nzm (4 to 10 in. lbs.).
(5) If necessary, loosen the lock nut and adjust the
over center adjuster screw to obtain the proper
torque. Re-tighten the lock nut to the lock nut.
(6) After tightening the locknut, measure the over-
center drag torque again and readjust the torque, if
necessary.
INSTALL
(1) Align the installation reference marks and in-
stall the pitman arm.
(2) Install and tighten the pitman shaft nut and
washer to 251 Nzm (185 ft. lbs.) torque.
(3) Install the horn button.
GEAR DISASSEMBLY
(1) Rotate the wormshaft from stop-to-stop and
count the number of rotations. Rotate the wormshaft
in the reverse direction 1/2 of the total number of ro-
tations to center it and the ball nut.
(2) Remove the pitman shaft adjustment screw
locknut. Remove the cover retaining bolts, cover, and
gasket (Fig. 3).
(3) Slide the adjustment screw head (Fig. 3) out of
the pitman shaft T-slot and remove it and the
shim(s).
(4) Retain the shim(s) for end-play measurement
during assembly.
(5) Remove the pitman shaft, the wormshaft bear-
ing preload torque adjustment cap locknut, and the
adjustment cap (Fig. 2).
(6) Remove the wormshaft and the ball nut (Fig.
2).
(7) Remove (pry) the pitman shaft and the worm-
shaft seals from the steering gear housing (Fig. 3).
WORMSHAFT AND BALL NUT DISASSEMBLY
(1) Remove the upper bearing from the wormshaft
(Fig. 2).
CAUTION: Do not allow the ball nut to rotate freely
and travel to either extreme end of the wormshaft.
This could damage the tangs at the ends of the re-
circulating ball guides (Fig. 3).
(2) Remove the recirculating ball guide clamp re-
taining screws, the clamp and the guides (Fig. 2).
Separate the half-guides and place the recirculating
balls aside in a container.
(3) Hold the ball nut over a cloth. Remove the re-
maining recirculating balls by rotating the worm-
shaft back and forth.
JSTEERING 19 - 37