light JEEP CHEROKEE 1988 Service Repair Manual
[x] Cancel search | Manufacturer: JEEP, Model Year: 1988, Model line: CHEROKEE, Model: JEEP CHEROKEE 1988Pages: 1378, PDF Size: 19.9 MB
Page 1038 of 1378
![JEEP CHEROKEE 1988 Service Repair Manual jacket mounting plate. Tighten screws to 60 INCH lbs. (7 N.m). Install\
lower bearing on lower end of jacket (if removed).
8) Install centering spheres and anti-lash spring in upper
steering](/img/16/57037/w960_57037-1037.png "JEEP CHEROKEE 1988 Service Repair Manual jacket mounting plate. Tighten screws to 60 INCH lbs. (7 N.m). Install\
lower bearing on lower end of jacket (if removed).
8) Install centering spheres and anti-lash spring in upper
steering")
jacket mounting plate. Tighten screws to 60 INCH lbs. (7 N.m). Install\
lower bearing on lower end of jacket (if removed).
8) Install centering spheres and anti-lash spring in upper
steering shaft. Install lower steering shaft from same side of spheres
that spring ends protrude. Perform a trial fit of assembly to ensure
that master serration of upper shaft is on same side as master
serration of lower shaft assembly.
9) Position shift bowl fully counterclockwise. Install
ignition switch actuator rod between bowl and jacket from bottom.
Guide back of coupling into support slot. Assemble bearing housing
over steering shaft. Engage rack over end of ignition switch actuator
rod.
10) Position access hole of bearing housing over end of
dimmer switch actuator rod. Rotate housing counterclockwise to
assemble. Holding lock shoes in disengaged position, assemble bearing
housing over steering shaft until pivot holes line up with holes in
support.
11) Install pivot pins. Assemble as far as possible, using
palm pressure of hand to prevent enlarging support pivot hole. Using a
small hammer and punch, tap pins into place. Replace wiper/washer
pivot assembly. Press pivot pin in cover (if removed). Check pivot
assembly for ease of movement.
12) If movement is restricted, tap other end of pin for
clearance. Install wiper/washer switch. Replace tilt lever opening
shield in cover (if removed). Position cap over dimmer switch actuator\
rod. Guide end of actuator rod into pivot slot during cover assembly.
Hold cap so that cover will slide over it.
13) Place housing in full upward position. Ensure there is
grease between guide and peg on support, tilt spring and tilt spring
retainer. Install guide. Using a screwdriver in retaining slot, turn
retainer clockwise to engage. Install bearing inner race and seat.
14) Install lock housing cover. Tighten 3 screws to 100 INCH
lbs. (11 N.m). Assemble key warning switch to spring clip with formed
end of clip under end of switch and with spring bowed away from switch
on side opposite contact. Push switch and spring into hole in lock
housing cover with contacts facing lock cylinder bore.
15) Install key light (if equipped). Install turn signal
switch wires and connector through cover, bearing housing and shift
bowl. Push in hazard plunger. Install turn signal switch. Tighten
screws to 25 INCH lbs. (3 N.m). Install hazard warning knob and screw.\
Pull knob out.
16) Install canceling cam spring, canceling cam (carrier
assembly) and lock plate. Using Lock Plate Depressor (J-23653-A for
Jeep), depress lock plate. See Fig. 12. Install a new retaining ring.
Install tilt release lever (if removed). Install turn signal switch
lever.
Fig. 12: Installing Lock Plate Retaining Ring
Page 1039 of 1378
17) Install ignition lock. Turn key to "LOCK" position.
Remove key. Insert cylinder into housing far enough to contact shaft.
Press inward while moving ignition switch actuator rod up and down to
align parts.
18) When parts align, cylinder will move inward and a spring
loaded retainer will snap into place locking cylinder in housing. To
replace ignition switch, position key cylinder in "LOCK" position.
Remove key. Place ignition switch in "LOCK" position (second detent
from bottom).
19) Fit ignition switch actuator rod into slider hole.
Loosely install on column with 2 screws. Push switch lightly toward
lock housing to take out slack in actuator rod. Tighten screws to 34
INCH lbs. (4 N.m). DO NOT move switch out of detent position.
20) Install dimmer switch by firmly seating push rod into
switch. Compress switch until 2 (.093") drill bit shanks can be
inserted into alignment holes. Reposition upper end of push rod in
pocket of wiper/washer switch. Remove lower column cover (if
necessary).
21) With a light upward pressure on switch, install 2 screws.
Remove drill bits. Switch should click when lever is lifted and again
as lever returns, just before it reaches lower stop. Install wire
protector over wires on column jacket, being careful not to pinch
wires.
22) Remove column from vise. Position lower bracket assembly
on steering column. Install 2 bolts. Tighten to 105 INCH lbs. (12 N.
m). Aligning master splines, install coupling assembly on steering
shaft. Support coupling under joint. Drive in roll pin.
NOTE: DO NOT remove bearings from housing unless they are to be
replaced. Install new bearings if bearings are removed from
housing. Never reuse old bearings.
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS TABLE \
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Application Ft. Lbs. (N.m)
Flexible Coupling Bolts .......................... 17 (23)
Steering Wheel Retaining Nut ..................... 45 (61)
Support Plate Bolts .............................. 17 (23)
INCH Lbs. (N.m)
Bearing Housing-to-Lock Housing Screws ............ 35 (4)
Bracket-to-Column Bolt .......................... 124 (14)
Column Clamp Stud ................................. 20 (2)
Column Clamp Stud Nut ........................... 106 (12)
Hazard Switch ..................................... 27 (3)
Housing Cover Screws ............................ 100 (11)
Ignition Switch Screws ............................ 35 (4)
Lock Housing-to-Jacket ........................... 90 (10)
Shift Tube Support Screws ......................... 60 (7)
Steering Column Lower Bracket Bolts ............. 106 (12)
Tilt Release Spring Retaining Screw ............... 35 (4)
Turn Signal Retaining Plate ....................... 27 (3)
Upper Bracket Nuts .............................. 106 (12)
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Page 1058 of 1378
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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Page 1059 of 1378
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.
Page 1064 of 1378
\003
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
Page 1079 of 1378
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AIR RIDE SUSPENSION - WARNING LAMPS
AIR RIDE SU](/img/16/57037/w960_57037-1078.png "JEEP CHEROKEE 1988 Service Repair Manual \
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AIR RIDE SUSPENSION - WARNING LAMPS
AIR RIDE SU")
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AIR RIDE SUSPENSION - WARNING LAMPS
AIR RIDE SUSPENSION - WARNING LAMP INSPECTION \
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Condition Code Procedure
Bulb burned out ......... A ............ Require replacement.
Warning light does
not come on during
bulb check ............. .. . Further inspection required to
determine cause.
Warning light flashes ... .. . Further inspection required to
determine cause.
Warning light is
intermittent ........... .. . Further inspection required to
determine cause.
Warning light stays
on after initial
bulb check ............. .. . Further inspection required to
determine cause.
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AIR RIDE SUSPENSION - WIRING HARNESSES
AIR RIDE SUSPENSION - WIRING HARNESS INSPECTION \
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Condition Code Procedure
Connector bent .......... A .. Require repair or replacement.
Connector broken ........ A .. Require repair or replacement.
Connector loose ......... A .. Require repair or replacement.
Damaged (cut, burned, or
chafed) ................ A .. Require repair or replacement.
Excessive resistance .... B .. Require repair or replacement.
Fuse blown .............. A ............ Require replacement.
Fusible link blown ...... A ............ Require replacement.
Open .................... A .. Require repair or replacement.
Poor ground ............. A .. Require repair or replacement.
Routed incorrectly ...... B .. Require rerouting according to
vehicle manufacturer's
specifications.
Shorted ................. A .. Require repair or replacement.
Terminal bent ........... A .. Require repair or replacement.
Terminal broken ......... A .. Require repair or replacement.
Terminal corroded ....... A .. Require repair or replacement.
Terminal loose .......... A .. Require repair or replacement.
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BALL JOINTS
Before requiring or suggesting ball joint replacement, the
approved OEM procedure must be used to measure ball joint wear. The
measurement(s) obtained, along with the vehicle manufacturer's
specifications, must be noted on the inspection report. Some states
require that these measurements also appear on the invoice.
NOTE: The term "perceptible movement," defined as any visible
movement in any direction, has been the industry standard
for determining the need for replacement of follower ball
joints. Some vehicle manufacturers are now publishing
specifications for follower ball joints that were
Page 1122 of 1378
\003
SU SPEN SIO N - F R O NT
1988 J e ep C hero ke e
1988 FRONT SUSPENSION
Jeep Coil & Leaf Spring
Cherokee, Comanche, Grand Wagoneer, Wagoneer, Wrangler
DESCRIPTION
Cherokee, Comanche and Wagoneer 2WD and 4WD front
suspensions consist of solid axle (tubular axle on 2WD), 4 control
arms, 2 coil springs and track bar. Track bar is used to minimize
front axle side-to-side movement. Stabilizer bar and shock absorbers
control suspension spring movement.
Grand Wagoneer and Wrangler models use leaf spring front
suspension with shock absorbers and stabilizer bar. Wrangler also uses
a track bar to maintain lateral position of front and rear axles.
ADJUSTMENTS
WHEEL ALIGNMENT
See WHEEL ALIGNMENT SPECIFICATIONS & PROCEDURES in WHEEL
ALIGNMENT section.
WHEEL BEARING
NOTE: Bearings should be cleaned, inspected, replaced (if
necessary) and lubricated before adjustment.
CAUTION: Never preload tapered roller bearings or damage to roller
ends will result. Bearings are designed to have a slightly
loose feel when properly adjusted.
2WD Models
1) Raise and support vehicle. Remove wheel and tire
assembly. Remove hub dust cap, cotter pin and nut retainer. Ensure
bearings are thoroughly packed with lithium grease.
2) Rotate hub and rotor assembly by hand, and tighten
retainer nut to 17-25 ft. lbs. (23-34 N.m) to seat bearings.
3) Loosen retainer nut 1/2 turn while rotating hub. Then
retighten nut to 19 INCH lbs. (2 N.m). Install nut retainer and new
cotter pin. Clean hub dust cap and coat inside with clean grease.
Reverse removal procedure for remaining components.
4WD Models (Grand Wagoneer)
1) On models equipped with locking hubs, remove locking
hubs. See appropriate LOCKING HUBS article. On models without locking
hubs, remove hub dust cap and drive gear snap ring. See Fig. 1.
2) Remove drive gear, pressure spring and spring cup. On
all models, remove outer lock nut and lock washer. Tighten inner lock
nut to 50 ft. lbs. (68 N.m) while rotating wheel.
3) Back off inner lock nut 45-65 degrees while rotating
wheel. Install washer and outer lock nut. Tighten outer lock nut to
50 ft. lbs. (68 N.m). Reverse removal procedure to complete
installation.
REMOVAL & INSTALLATION
Page 1140 of 1378
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Condition Code Procedure
Bulb burned out ......... A ............ Require replacement.
Warning light does
not come on during
bulb check ............. .. . Further inspection required to
determine cause.
Warning light flashes ... .. . Further inspection required to
determine cause.
Warning light is
intermittent ........... .. . Further inspection required to
determine cause.
Warning light stays
on after initial
bulb check ............. .. . Further inspection required to
determine cause.
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AIR RIDE SUSPENSION - WIRING HARNESSES
AIR RIDE SUSPENSION - WIRING HARNESS INSPECTION \
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Condition Code Procedure
Connector bent .......... A .. Require repair or replacement.
Connector broken ........ A .. Require repair or replacement.
Connector loose ......... A .. Require repair or replacement.
Damaged (cut, burned, or
chafed) ................ A .. Require repair or replacement.
Excessive resistance .... B .. Require repair or replacement.
Fuse blown .............. A ............ Require replacement.
Fusible link blown ...... A ............ Require replacement.
Open .................... A .. Require repair or replacement.
Poor ground ............. A .. Require repair or replacement.
Routed incorrectly ...... B .. Require rerouting according to
vehicle manufacturer's
specifications.
Shorted ................. A .. Require repair or replacement.
Terminal bent ........... A .. Require repair or replacement.
Terminal broken ......... A .. Require repair or replacement.
Terminal corroded ....... A .. Require repair or replacement.
Terminal loose .......... A .. Require repair or replacement.
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BALL JOINTS
Before requiring or suggesting ball joint replacement, the
approved OEM procedure must be used to measure ball joint wear. The
measurement(s) obtained, along with the vehicle manufacturer's
specifications, must be noted on the inspection report. Some states
require that these measurements also appear on the invoice.
NOTE: The term "perceptible movement," defined as any visible
movement in any direction, has been the industry standard
for determining the need for replacement of follower ball
joints. Some vehicle manufacturers are now publishing
specifications for follower ball joints that were
Page 1193 of 1378
\003
TR AN SFE R C ASE - C O M MAN D T R AC D IA G NO SIS
1988 J e ep C hero ke e
1984-90 Drive Axles - Transfer Case - Electronic Diagnosis
Cherokee, Wagoneer, Wrangler (1987-90)
VACUUM CONTROL SYSTEM
The Command-Trac vacuum switch consists of a vacuum control
switch on the transfer case, an air vent filter, a vacuum shift motor
(located on front axle), a four-wheel drive indicator light and vacuum\
switch, two vacuum check valves and an interconnecting vacuum harness.
See Fig. 1 .
Fig. 1: Command-Trac Vacuum Control System
AXLE SHIFT MOTOR FUNCTIONAL TEST
1) Raise vehicle. Disconnect vacuum harness from axle shift
motor and connect a vacuum pump to vacuum shift motor port. See
Fig. 2 .
Page 1209 of 1378
1) Clean all parts with solvent. Dry with compressed air.
Replace all oil seals, "O" rings and snap rings. Check all parts for
wear or damage. Replace all worn or damaged parts. Apply Dexron II to
all parts before installing.
2) Inspect low range annulus gear inside front case. If gear
is worn or damaged, replace case and gear as an assembly. Replace oil
pump as an assembly if any part is damaged or worn.
NOTE: When installing bearings, ensure bearing bores are aligned
with oil feed holes.
TRANSFER CASE REASSEMBLY
1) Install front output shaft front bearing, snap ring and
oil seal. Install snap ring on input gear bearing. Using a wooden
block and press, install input gear until snap ring is against case.
2) Install input gear pilot bearing. Assemble low range gear,
thrust washers, input gear and retainer. Install low range gear snap
ring. Ensure snap ring is seated properly in groove.
3) Start input gear shaft through the bearing in front case.
Using a press, install input gear shaft through bearing. Ensure
adapter is positioned properly before pressing shaft.
NOTE: Ensure proper size tool is used to press input gear shaft;
wrong size tool can damage case and thrust washers and will
move pilot bearing too far into gear bore.
4) Install input gear snap ring. Install front bearing
retainer oil seal. Apply 1/8" bead of silicone sealant to front
bearing retainer mating surface. Install front bearing retainer on
front case. Install sector shaft "O" ring and bushing. Install shift
sector.
5) Install detent pin, spring and plug. Install low range
fork pads. Assemble low range fork and hub. Ensure low range fork pin
is engaged in shift sector slot. Install differential sprocket gear in
lower differential case. Install planet gears and new thrust washers
on lower case pins.
6) Ensure thrust washers are positioned on top and bottom of
each planet gear. Install mainshaft gear. Align marks on upper and
lower differential case. Install bolts and tighten to specifications.
See TORQUE SPECIFICATIONS . Install needle bearing spacer on mainshaft.
7) Using petroleum jelly to hold needles, install bearings on
mainshaft. Install other spacer. Install differential assembly. Ensure
all needle bearings are in place. Install differential snap ring.
Install intermediate clutch shaft. Install thrust washer and snap
ring. Install mode shift sleeve in mode fork.
8) Install mode fork assembly on mainshaft. Ensure mode shift
sleeve splines engage with differential splines. Install mode fork and
mainshaft assembly in case. If necessary, rotate mainshaft slightly to
engage mainshaft with low range components.
9) Install mode fork pin into shift sector slot. Install
shift rail. Ensure shift rail is seated in shift forks. Rotate shift
sector so lock pin can be installed. Install lock pin so tapered end
is in fork and rail. Install plug. Install shift lever and nut on
shift sector shaft.
10) Install detent plunger, spring and plug. Install front
output shaft. Install drive chain and sprocket. Install drive sprocket
snap ring. Install front output shaft rear bearing.
11) Install oil seal in oil pump housing. Assemble oil pump
gears in housing. Ensure oil feed hole is aligned with hole in
housing. Install oil pump screws. Tighten to specification. Install