clock JEEP CHEROKEE 1988 Service Owner's Guide

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









\









\









\









\









\









\






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









\









\









\









\









\









\

Will Not Shift Or Difficult To Shift Into Gear
Vehicle speed too high; slow vehicle to 2-3 MPH to shift.
Vehicle operated too long on dry paved surface; stop vehicle and place
in Reverse or Neutral to relieve driveline torque. Ensure transfer
case external linkage is not binding. Ensure correct fluid is used.
Internal parts may be worn or damaged.
Noisy In All Gears
Check fluid level. Ensure correct fluid is used. If fluid is
okay, locate possible internal mechanical problem.
Jumps Out Of Gear Or Noisy In 4WD
Transfer case not completely in gear; check shift linkage.
Range fork damaged. Shift fork pads are worn or shift fork binding.
Low range gear worn.
Fluid Leaking From Vent Or Seals
Transfer case overfilled. Vent plugged. Output shaft seals
are damaged or not installed properly.
ON-VEHICLE SERVICE
FRONT OIL SEAL
Removal & Installation
1) Mark front drive shaft and flange for installation
alignment reference. Remove front drive shaft. Remove flange. Discard
washer and nut. Using a screwdriver, carefully remove oil seal. Ensure
seal contact surface is clean.
2) Apply ATF to seal lip and flange seal surface. Install NEW
oil seal. Install flange and NEW washer and nut. Tighten nut to
specifications. See TORQUE SPECIFICATIONS . Install front drive shaft
using alignment marks. Check transfer case fluid.
EXTENSION HOUSING OIL SEAL & BUSHING
Removal & Installation
1) Mark rear drive shaft and flange for installation
alignment reference. Remove rear drive shaft. Tap extension housing in
a clockwise direction and remove extension housing. DO NOT pry on
extension housing. Using a screwdriver, remove oil seal from extension
housing.
2) Using bushing driver, replace bushing in extension
housing. Install NEW extension housing oil seal. Apply silicone
sealant to extension housing mating surface. Install extension
housing. To complete installation, reverse removal procedure.
REMOVAL & INSTALLATION
TRANSFER CASE
Removal
1) Shift transfer case into 4H and disconnect battery
negative cable. Raise vehicle, remove skid plate and drain fluid.
2) Mark front and rear output shaft yokes to drive shafts for
reassembly reference. Support transfer case and remove rear
crossmember. Remove drive shafts.
3) Disconnect vehicle speed sensor electrical connector and
vacuum (hoses) harness at transfer case. Remove shift lever or linkage\
rod from case. Remove transfer case attaching bolts. Remove transfer
case from vehicle.

Removal & Installation
1) Mark front propeller shaft and flange for alignment
purposes. Remove front propeller shaft. Remove flange. Discard washer
and nut. Using a screwdriver, carefully remove oil seal. Ensure seal
contact surface is clean.
2) Apply ATF to seal lip and yoke seal surface. Install oil
seal and flange with new washer and nut. Install front propeller shaft
using alignment marks. Check transfer case fluid.
EXTENSION HOUSING OIL SEAL & BUSHING
NOTE: When replacing oil seal, DO NOT remove extension housing.
Removal & Installation
1) Mark rear propeller shaft and flange for installation
purposes. Remove rear propeller shaft. Remove bolts and tap extension
housing in a clockwise direction and remove extension housing. DO NOT
pry on extension housing. Using a screwdriver, remove oil seal from
extension housing.
2) Using bushing driver, replace bushing in extension
housing. Install new extension housing oil seal. Apply silicone
sealant to extension housing mating surface. Install extension
housing. Reverse removal procedure to complete installation.
REMOVAL & INSTALLATION
TRANSFER CASE
Removal & Installation
1) Shift transfer case into Neutral position and drain fluid.
Mark front and rear drive shaft for installation purposes. Remove
front and rear drive shafts. Disconnect vacuum lines and speedometer
cable. Remove rear crossmember.
2) Disconnect shift linkage. Support transfer case with a
jack. Separate transfer case from transmission. Remove transfer case.
To install, reverse removal procedure. Tighten bolts to specification.
See TORQUE SPECIFICATIONS . Adjust shift linkage, if necessary.
TRANSFER CASE DISASSEMBLY
1) Remove drain and fill plugs. See Fig. 1. Remove front
companion flange, washer and seal. Place transfer case in 4L position.
Remove extension housing. See EXTENSION HOUSING OIL SEAL & BUSHING
under ON-VEHICLE SERVICE. Remove rear bearing snap ring. Remove rear
bearing retainer. Separate rear case from front case using prybars or
screwdriver. DO NOT damage mating surfaces.
NOTE: DO NOT disassemble oil pump, replace as unit only.
2) Remove oil pump, pick-up tube and screen from rear case.
Remove pick-up tube "O" ring from oil pump. Remove magnet from front
case. Remove drive sprocket snap ring. Remove drive sprocket and drive
chain.
3) Remove front output shaft. Remove shift lever from sector
shaft. Remove shift detent plug, spring and plunger. Remove plug from
low range fork lock pin access hole. Move shift sector until lock pin
is aligned with hole. Remove lock pin with No. 1 screw extractor.
4) Remove shift rail from fork assembly. Remove mode fork and
mainshaft as an assembly. Record mode sleeve position. Remove mode
shift sleeve and mode fork assembly. Remove sleeve from fork. Remove

\003
TR AN SM IS SIO N R EM OVA L & IN STA LLA TIO N - M /T

1988 J e ep C hero ke e
1988 MANUAL TRANSMISSION REMOVAL
Jeep
Cherokee, Comanche, Grand Wagoneer, Pickup, Wagoneer,
Wrangler
REMOVAL & INSTALLATION
TRANSMISSION
Removal
1) Remove screws attaching shift lever boot to floorpan.
Slide boot over lever. On models with T-176 transmission, press and
turn shift lever retainer counterclockwise to release lever.
2) Remove lever, boot, spring and seat as an assembly. On all
models, raise vehicle and support with safety stands. Disconnect rear
drive shaft from transfer case and wire out of way.
3) DO NOT allow shaft to hang free, as damage to universal
joint may result. Disconnect front parking brake cable at equalizer.
Remove rear cable clip from crossmember.
4) Place a jack under clutch housing to support engine.
Remove rear crossmember from frame. Disconnect speedometer cable,
back-up light switch wire and 4WD indicator switch wire.
5) Disconnect transfer case vent hose. Disconnect front drive
shaft and wire out of way. On Wrangler, remove transfer case shift
lever by removing shifter shaft retaining nut.
6) Remove cotter pins retaining shift control link pins in
shift rods and remove pins. Remove shifter shaft and disengage shift
lever from shift control links. Move lever out of the way.
NOTE: On some models, shifter shaft must be unthreaded from shift
lever in order to be removed. On other models, shaft can be
removed by sliding it out of lever.
7) Remove cotter pin and washers connecting link to shift
lever. Separate link from lever. Support transmission and transfer
case with jack.
8) Remove bolts securing transmission to clutch housing and
remove transmission and transfer case. Separate transfer case and
transmission.
Installation
1) Install pilot bushing lubricating wick and align throw out
bearing with splines in driven plate hub. Shift transmission into gear
using shift lever or a long screwdriver. This prevents clutch shaft
from rotating during installation and makes clutch shaft-to-driven
plate spline alignment easier.
2) Mount transmission on transmission jack. Raise
transmission and align transmission clutch shaft with splines in
driven plate hub.
3) When transmission is seated on clutch housing, install and
tighten transmission-to-clutch housing bolts. Apply Permatex No. 3
sealer to both sides of replacement transmission output shaft and
transfer case input shaft splines.
4) To install transmission, reverse removal procedure. Adjust
clutch and shift linkage.
TORQUE SPECIFICATIONS

WIR IN G D IA G RAM S

1988 J e ep C hero ke e
1988 Wiring Diagrams
Jeep
Cherokee & Wagoneer
IDENTIFICATION
COMPONENT LOCATION MENU
COMPONENT LOCATIONS TABLE








\









\









\









\









\









\









\


Component Figure No. (Location)
A/C & Htr Systems ............................... 5 (A-D 16-19)
Alternator ............................................ 1 (C 3)
Audio Alarm Module ................................... 7 (D 27)
Back-Up Lt Sw (M/T) .................................. 4 (D 12)
Battery ............................................... 1 (A 2)
Beam Sel Sw .......................................... 6 (E 23)
Brake Warning Sw ..................................... 6 (C 20)
Clock ................................................ 7 (E 27)
Clutch Switch ........................................ 4 (E 15)
Courtesy Lights ................................... 7 (C 24-26)
Cruise Ctrl Sys ................................... 4 (E 12-15)
Diag Conn D1 (2.5L) ................................... 3 (B 9)
Diag Conn D1 (4.0L) ................................... 2 (B 4)
Diag Conn D2 (2.5L) .................................. 3 (B 11)
Diag Conn D2 (4.0L) ................................... 2 (B 7)
DIR Hazard Sw ................................... 6 (D-E 20-21)
Door Switches ........................................ 7 (C 27)
Elect Ctrl Unit (2.5L) ............................. 3 (A 9-10)
Elect Ctrl Unit (4.0L) .............................. 2 (A 4-7)
Engine Compartment Lt ................................. 1 (C 1)
Fog Light Relay ....................................... 1 (D 2)
Fog Light Sw ...................................... 6 (E 21-22)
Fuel Pump Rly (2.5L) .................................. 3 (C 9)
Fuel Pump Rly (4.0L) ................................ 2 (E 5-6)
Fuel Tank Unit ....................................... 6 (B 20)
Fus Links ........................................... 1 (B 2-3)
Fuse Block ...................................... 4 (B-D 12-15)
4WD Switch ..................................... 6 (C 20, D 21)
Gear Sel Sw .......................................... 5 (C 16)
Glove Box Light ...................................... 7 (C 25)
Headlight Delay Module ............................... 6 (E 23)
Headlight Switch .................................. 6 (D 22-23)
Horn Relay ............................................ 1 (C 2)
Ignition Ctrl Mod (2.5L) ............................ 3 (B-C 8)
Ignition Ctrl Module (4.0L) ........................... 2 (E 4)
Ignition Key Warn Sw ................................. 7 (D 26)
Ignition Switch ................................... 4 (A 12-15)
Illum Lights .................................... 7 (C-D 24-25)
Instrument Cluster .............................. 6 (A-C 22-23)
Keyless Entry Module .............................. 7 (B 24-25)
Latch Rly (B+) (4.0L) ............................... 2 (B-C 4)
Power Antenna Rly .................................. 7 (D-E 27)
Power/Comfort Sw ..................................... 5 (D 19)
Power Door Lock Sys ............................. 7 (A-C 24-27)
Power Mirror Sw ................................. 7 (D-E 24-25)
Power Seat Sw ................................... 8 (A-B 28-29)