1988 JEEP CHEROKEE Service Repair Manual

2) Install stub shaft cap "O" ring in valve body. Align valve
body drive pin on worm with narrow pin slot in valve body. Worm drive
lugs must engage in stub shaft cap.
3) Install valve body and worm assembly into housing. Perform
installation by pressing directly on valve body only. This will
prevent stub shaft "O" ring from disengaging from valve body.
4) Valve body is correctly seated when fluid return port in
housing is fully visible. Ensure worm locating pin is fully engaged in
valve body. Place seal protector over input shaft, install a new
adjuster plug "O" ring, then install adjuster plug.
5) Remove seal protector from housing and loosely install
adjuster plug lock nut. Insert arbor and rack/piston into housing.
Align worm and rack/piston and turn stub shaft clockwise to engage
worm. Maintain pressure on arbor until worm is fully engaged.
6) Turn input shaft clockwise until middle rack groove in
rack/piston is aligned with center of sector shaft roller bearing.
Remove arbor. Install a new sector shaft cover gasket.
7) Thread sector shaft cover onto adjuster screw until
bottomed. Back off 1 1/2 turns. Install sector shaft so that center
gear tooth meshes with center groove in rack/piston. Install cover
attaching bolts.
8) Install adjuster lock nut halfway onto sector shaft.
Install piston and plug in rack/piston. Install housing end plug "O"
ring, end plug and retainer ring. Adjust worm bearing preload and
over-center preload at this time.
ADJUSTER PLUG
Disassembly
1) Remove thrust bearing retainer ring with a screwdriver,
taking care not to score needle bearing bore. Discard retainer ring.
Remove thrust bearing spacer, thrust bearing and bearing races.
2) Remove and discard adjuster plug "O" ring, then remove
input shaft seal retainer. Remove and discard dust seal. Pry input
shaft seal from adjuster plug.
3) Inspect needle bearing in adjuster plug. If necessary,
remove bearing by pressing out from spacer end. See Fig. 9.
Inspection
Inspect thrust bearing for cracks and rollers for pitting,
scoring, or cracking. Check thrust races and spacer for damage or
damage. Replace parts as necessary.
Fig. 9: Exploded View of Adjuster Plug Assembly
Reassembly
1) Press roller bearing into adjuster plug (identification
end facing arbor) until bearing bottoms on input shaft seal bore.

Install input shaft seal with spring in seal facing adjuster plug.
2) Install dust seal into adjuster plug. Rubber face of seal
must face away from plug. Install retainer ring. Install adjuster plug
"O" ring.
3) Assemble thrust bearing, thrust bearing race, and thrust
bearing spacer on adjuster plug. Using a brass or wooden dowel, press
bearing retainer into needle bearing bore.
RACK/PISTON & WORM
Disassembly
Remove worm, lower thrust bearing and bearing races from rack
piston. Remove piston ring and back-up "O" ring from rack/piston.
Remove ball return guide clamp, ball return guide and all ball
bearings from rack/piston.
Inspection
1) Clean and dry all parts. Inspect worm and rack/piston
grooves for scoring. Inspect ball bearings for damage. If any ball
bearings are damaged, replace entire set. Check ball guides for
pinching of ends.
2) Inspect lower thrust bearing races for cracking, scoring,
or pitting. Replace wormshaft and rack/piston as an assembly if either
part is damaged. Inspect rack/piston teeth for chips, cracks, dents or
scoring.
Reassembly
1) Install "O" ring and piston ring onto rack/piston using
care not to twist them. Install worm into rack/piston until worm is
against piston shoulder. Install ball bearings into rack/piston while
slowly rotating worm counterclockwise.
NOTE: See RACK PISTON & WORM ASSEMBLY BALL BEARINGS table for
number of balls to be installed. BE SURE to install light
and dark colored balls alternately, as Black balls are
.0005" smaller than Silver balls.
2) Install correct number of balls in ball guide. Bearings in
guide must be in sequence with bearings in rack/piston. Hold balls in
place with chassis lubricant and install return ball guide assembly
into position.
3) Install clamp and tighten attaching bolts. Alternate light
and dark colored balls when installing. See Fig. 10. Insert
rack/piston arbor into rack/piston until it contacts worm. Maintain
pressure on arbor, and back worm out of rack/piston. DO NOT allow ball
bearings to drop out of circuits.
RACK PISTON & WORM ASSEMBLY BALL BEARINGS TABLE









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Application Rack/Piston Guide
Jeep ...................... 18 ....................... 6









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Fig. 10: Installing Ball Bearing into Rack/Piston Assembly
ROTARY VALVE
NOTE: Complete valve assembly is balanced during assembly. If
replacement of any part other than rings or seals is
necessary, replace complete assembly.
Disassembly
1) Remove and discard stub shaft cap "O" ring. Invert valve
and lightly tap end of stub shaft against wood block until shaft cap
is free of valve body. Pull stub shaft outward until drive pin hole is
visible. Depress the pin to remove the stub shaft from the valve body.
See Fig. 11 .
NOTE: DO NOT pull shaft any further than 1/4" (6 mm) or spool
valve may become cocked in valve body.

Fig. 11: Pulling Shaft from Valve Assembly
2) Disengage drive pin and carefully remove stub shaft from
valve body and spool assembly with a twisting motion. If binding
occurs, realign valve and try removal again.
CAUTION: DO NOT force stub shaft or spool out of valve body.
3) Remove spool valve from valve body with twisting motion.
Remove and discard all "O" rings and Teflon rings.
Fig. 12: Exploded View of Valve Body Assembly
Reassembly
1) Lubricate all valve body components with power steering
fluid. Install replacement back-up "O" rings in seal grooves and

install replacement seal rings over back-up rings. Take care not to
damage seal rings during installation.
NOTE: Teflon seal rings may appear to be distorted after
installation. However, heat of operation will straighten
them.
2) Lubricate replacement spool valve damper "O" ring with
petroleum jelly. Install on spool valve. Carefully insert spool valve
into valve body.
3) Push spool valve through valve body until locating pin
hole is visible at opposite end of valve body and spool valve is flush
with the notched end of the valve. Install stub shaft in spool valve
and valve body.
4) Be sure stub shaft locating pin is aligned with spool
valve locating hole. Align notch in stub shaft cap with stub shaft
locating pin and press sub shaft and spool valve into valve body.
Install stub shaft cap "O" ring into valve body. See Fig. 13.
CAUTION: Before installing assembled valve body into gear housing, be
sure valve body stub shaft locating pin is fully engaged in
stub shaft cap notch. DO NOT allow stub shaft to disengage
from valve body pin.
Fig. 13: Aligning Pin & Notch for Input (Stub) Shaft
Stub shaft locating pin must align with spool valve locating hole.
STEERING GEAR HOUSING
Disassembly
1) Remove sector shaft seal retaining ring and remove lower
steel washer. Remove lower seal, spacer washer and upper seal from
housing. Press sector shaft bearing out of housing from lower end.
2) To remove hose connector seat, tap out seat using a 5/16"-

18 thread tap. Thread connector seats ONLY 2-3 threads. Install a bolt
with a flat washer and nut into seat.
3) Hold bolt from turning and tighten nut to extract seat
from housing. Some steering gear units have metric thread fittings and
hose fittings which use "O" ring seals instead of connector seats.
Remove check valve and spring from inlet port and discard.
Fig. 14: Gear Housing Seals & Bearing
Inspection
1) Replace housing if bore is severely worn, scored or
pitted. Minor scratches may be removed with crocus cloth. Inspect

housing ball plug for fluid leakage. Seat ball plug with blunt punch.
2) Spray ball area with Loctite Solvent 7559 and dry with
compressed air. Cover ball area with Loctite Sealant 290. Allow
sealant to cure for 2 hours before assembling gear.
3) Inspect all retaining ring, bearing and seal surfaces in
housing. Replace housing if any surface is worn or damaged.
Reassembly
1) Working from upper end, press a new bearing into housing
until it is seated .030" (.76 mm) below shoulder in housing bore.
Lubricate new seal with power steering fluid.
2) Install single lipped seal and spacer washer only far
enough to provide clearance for next seal, washer and retaining ring.
DO NOT bottom seal against housing counterbore.
3) Install double lipped seal and steel washer. Install
retaining ring. DO NOT allow seals to contact one another. To ensure
proper seal action, be sure there is clearance between them.
4) If port seat was removed, position new spring, check
valve, and a new seat over opening in housing. Drive into place using
a brass drift.
TORQUE SPECIFICATIONS
CHEROKEE, COMANCHE, WAGONEER & WRANGLER
TORQUE SPECIFICATIONS (CHEROKEE, COMANCHE, WAGONEER & WRANGLER)








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Application Ft. Lbs. (N.m)
Adjuster Plug Lock Nut .......................... 80 (108)
Gear Housing-to-Frame Attaching Bolts ........... 75 (102)
Pitman Arm Attaching Nut ....................... 185 (250)
Rack Piston End Plug ............................. 50 (68)
Sector Shaft Adjuster Lock Nut ................... 33 (45)
Side Cover Bolts ................................. 45 (60)









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GRAND WAGONEER & "J" TRUCK)
TORQUE SPECIFICATIONS (GRAND WAGONEER & "J" TRUCK)








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Application Ft. Lbs. (N.m)
Adjuster Plug Lock Nut .......................... 85 (116)
Gear Housing-to-Frame Attaching Bolts ............... (95)
Pitman Arm Attaching Nut ....................... 185 (250)
Rack Piston End Plug ............................ 75 (102)
Sector Shaft Adjuster Lock Nut ................... 33 (45)
Side Cover Bolts ................................. 40 (54)









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STE ER IN G K NUCKLE S - 4 W D

1988 J e ep C hero ke e
1988 4WD Steering Knuckles
ALL MANUFACTURERS
DESCRIPTION
Open type steering knuckles are used on all models. Open
type knuckles provide sharper turning angle, which will decrease
vehicle turning radius. Axle shafts are free floating. Depending upon
vehicle model, steering knuckles can be attached to axle housing by
either ball joints or roller bearings and king (pivot) pins.
OVERHAUL
BALL JOINT TYPE
Disassembly
1) Raise vehicle and support securely. Remove wheels. Remove
brake caliper and rotor. If equipped, remove locking hubs. See
appropriate LOCKING HUBS article in DRIVE AXLE section.
2) Disconnect tie rod end from steering knuckle. Remove
spindle nuts and lightly tap spindle with soft face hammer to free it
from steering knuckle. Pull out axle shaft assembly.
3) Clean all components with solvent and dry with compressed
air. Inspect all parts for burrs, chips, wear, flat spots or cracks.
Replace all damaged or worn parts.
NOTE: When aligning upper ball joint nut to install cotter pin,
always tighten nut to align. Never loosen nut to align holes.
Reassembly
To reassemble, reverse disassembly procedure. Torque all
fittings to specifications.
Fig. 1: Exploded View of Steering Knuckle Assembly
ADJUSTMENT