JEEP CHEROKEE 1988 Service Repair Manual

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

NOTE: All other models are not adjustable.
BALL JOINTS
Jeep, Truck & Wagoneer
1) Raise vehicle and remove front wheels. Disconnect
steering damper and connecting rod. Remove cotter pin from right side
tie rod retaining nut. Rotate steering knuckles through complete arc
several times.
2) Place torque wrench on right side tie rod retaining nut.
Torque to turn knuckles through complete arc should not be more than
25 ft. lbs. (34 N.m).
3) If turning effort is excessive, disconnect tie rod ends
at knuckles. Measure turning effort of right and left side knuckles.
Individual turning effort should not be more than 10 ft. lbs. (14
N.m).
4) If individual turning effort is more than specified,
replace upper ball joint split ring seat. If turning effort is more
than 10 ft. lbs. (14 N.m) after split ring seat replacement, ball
joints will have to be replaced.
TURNING ANGLE
Truck & Wagoneer
1) Turning angle stop screws are located at rear of steering
knuckle, just above axle centerline. To adjust, loosen lock nut on
turning angle stop screw. Jeep turning angle is not adjustable.
2) Using turntable to measure angle, adjust stop screw to
obtain specified angle. Tighten lock nut without changing setting.
TURN ANGLE ADJUSTMENT
TURNING ANGLE ADJUSTMENT TABLE








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Application Left Right
Wheel Wheel
Jeep
Cherokee,
Comanche,
& Wrangler .......... ( 1) 32-33
 ................. ( 1) 32-33
Wagoneer ................. 36-37 ....................... 36-37
(1) - Angle stops are not adjustable. Parts must be replaced if
angle is incorrect.









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TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS TABLE








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Application Ft. Lbs.(N.m)\
Ball Joint Type
Lower Ball Joint Nut
Jeep .................................................. 100 (136)\
Upper Ball Joint Nut
Jeep .................................................. 100 (136)\
Upper Ball Joint Split Retaining Seat
Jeep ..................................................... 50 (68)\









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Fig. 2: Exploded View of Ball Joint Type Steering Knuckle
Assembly

STE ER IN G L IN KAG E

1988 J e ep C hero ke e
1988 STEERING
Jeep Steering Linkage
All Models
STEERING SERVICE PRECAUTIONS
All steering component fasteners are made of special quality
materials. Replacement fasteners must be of same part number or
equivalent. Tighten all fasteners to specification. Always use new
cotter pins. DO NOT back off castle nuts to align cotter pin hole.
Tighten nut to next slot that lines up with hole.
DO NOT hammer on ball studs. If threads are not clean and
smooth, ball studs may turn in joint when nuts are tightened. Sleeve
clamps must always be positioned as specified before tightening bolts.
TROUBLE SHOOTING
Refer to TROUBLE SHOOTING - BASIC PROCEDURES article in the
GENERAL TROUBLE SHOOTING section.
REMOVAL & INSTALLATION
TIE ROD REPLACEMENT
Removal & Installation
1) Remove cotter pins and retaining nuts at both ends of tie
rod and connecting rod ball joints. Disconnect steering damper from
tie rod. Using puller and appropriate adapters from Ball Joint Tool
Kit (J-34503), remove tie rod ends from steering arms and connecting
rod.
2) Loosen clamp bolts. Remove tie rod ends from adjusting
sleeve noting the number of turns. To install, thread new tie rod ends
into adjusting sleeve. Attach tie rod ends to steering arms and
connecting rod. Tighten nuts.
3) Install new cotter pins. Attach steering damper. Check and
adjust toe-in. See WHEEL ALIGNMENT SPECIFICATIONS & PROCEDURES
article in WHEEL ALIGNMENT section. Tighten clamp bolts.
Fig. 1: Cherokee, Comanche, Wagoneer & Wrangler Steering Linkage
STEERING DAMPER REPLACEMENT
Removal & Installation

1) Place front wheels in straight-ahead position. Remove lock
nuts and washers from damper ends. Remove damper assembly and rubber
bushings.
2) To install, place rubber bushings in damper eyelets. On
Grand Wagoneer models, secure eyelet at push rod end to stud on tie
rod bracket. Install rubber bushings in damper body eyelet. On
Cherokee, Comanche, Wagoneer and Wrangler, install stud at push rod
end into hole on tie rod.
3) On all models, attach opposite end of damper with bolt and
lock nut (Cherokee, Comanche, Wagoneer and Wrangler) or with a lock
nut (Grand Wagoneer). Tighten lock nuts.
Fig. 2: Grand Wagoneer Steering Linkage
WHEEL ALIGNMENT

After performing appropriate service procedures, refer to
WHEEL ALIGNMENT SPECIFICATIONS & PROCEDURES article in the WHEEL
ALIGNMENT section.
CONNECTING ROD REPLACEMENT
Removal & Installation
Remove cotter pins and nuts from both ends of connecting rod.
Using a separator, remove connecting rod. To install, place wheels in
straight-ahead position. Center pitman arm. Install connecting rod.
Tighten lock nuts. Install new cotter pins.
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS TABLE








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Application Ft.Lbs. (N.m)
Clamp Bolt
Grand Wagoneer ................................. 30 (41)
All Others ..................................... 14 (19)
Connecting Rod Nut
5/8" ........................................... 70 (95)
9/16" .......................................... 60 (82)
Pitman Arm-to-Shaft Nut ........................ 185 (251)
Steering Damper Lock Nut
Wrangler ....................................... 53 (71)
All Others ..................................... 30 (41)
Tie Rod End Stud Nuts
Grand Wagoneer ................................. 60 (82)
All Others ..................................... 35 (47)









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* S TE ER IN G U NIF O RM IN SPEC TIO N G UID ELIN ES *

1 988 J e ep C hero ke e
GENERAL INFORMATION
Steering, Suspension, Wheel Alignment, Wheels and Tires
Motorist Assurance Program
Standards For Automotive Repair
All Makes and Models
INTRODUCTION TO MOTORIST ASSURANCE PROGRAM (MAP)
CONTENTS
Motorist Assurance Program (MAP)
OVERVIEW
OVERVIEW OF SERVICE REQUIREMENTS & SUGGESTIONS
Steering and Suspension
AIR RIDE SUSPENSION
AIR RIDE SUSPENSION - AIR SHOCKS AND AIR STRUTS
AIR RIDE SUSPENSION - AIR SPRING VALVES
AIR RIDE SUSPENSION - AIR SPRINGS
AIR RIDE SUSPENSION - COMPRESSORS
AIR RIDE SUSPENSION - HEIGHT SENSORS
AIR RIDE SUSPENSION - MODULES
AIR RIDE SUSPENSION - RELAYS (COMPRESSOR)
AIR RIDE SUSPENSION - SWITCHES (ON/OFF)
AIR RIDE SUSPENSION - TORSION SPRINGS (COUNTER BALANCING)
AIR RIDE SUSPENSION - TUBING
AIR RIDE SUSPENSION - WARNING LAMPS
AIR RIDE SUSPENSION - WIRING HARNESSES
BALL JOINTS
BUSHINGS
CENTER LINKS
CONTROL ARM SHAFTS
CONTROL ARMS
DRAG LINKS
ELECTRONIC RIDE CONTROL SHOCKS AND STRUTS
IDLER ARMS
KING PINS
PITMAN ARMS
POWER STEERING HOSES
POWER STEERING (HYDRAULIC) PUMPS
RADIUS ARMS
RELAY RODS
SHOCK ABSORBERS, STRUT CARTRIDGES AND STRUT ASSEMBLIES
SPINDLES
SPRINGS - COIL, LEAF AND TORSION BAR
STEEL POWER STEERING LINES
STEERING ARMS
STEERING DAMPERS
STEERING GEARS (EXCEPT RACK AND PINION)
STEERING GEARS - RACK AND PINION
STEERING KNUCKLES
STRIKE OUT BUMPERS
STRUT RODS
STRUT UPPER BEARING PLATE ASSEMBLIES
SWAY BAR LINKS
SWAY BARS