1988 JEEP CHEROKEE Key turns

2) To determine if front axle has completed a shift out of
4WD into 2WD, position mode select switch back to "4WD" position while
operating vehicle at slow speed. If vehicle shifts into 2WD, axle will
ratchet. If shift is not completed, transfer case will shift into 4WD
and hissing sound will come from mode select switch.
FRONT AXLE SHIFT MOTOR TEST
1) Disconnect vacuum harness from front axle shift motor.
Connect vacuum pump to shift motor front port. Apply 15 in. Hg vacuum
to shift motor. Rotate right front wheel to disengage axle.
2) Shift motor should hold vacuum at least 30 seconds. If
not, replace motor. If motor does hold vacuum, disconnect vacuum pump
from shift motor front port. Connect pump to shift motor rear port and
cap transfer case connecting port. Apply 15 in. Hg vacuum to motor.
3) Shift motor should hold vacuum for at least 30 seconds. If
not, replace motor. If motor does hold vacuum, remove cap from shift
motor transfer case connecting port and check for vacuum. If no vacuum
is present, rotate right front wheel to ensure axle has shifted
completely. Axle must completely shift to open shift motor connecting
port.
4) Recheck vacuum at shift motor transfer case port. If
vacuum is present, transfer case requires diagnosis. Command-Trac uses
Model 207 transfer case. Selec-Trac uses Model 228 transfer case.
REMOVAL & INSTALLATION
LOCKING HUB
Removal
1) Remove cover to outer clutch housing. Remove bearing race
spring assembly. Remove sealing ring and seal bridge retainer. Remove
bearing components.
2) Squeeze tangs of wire retaining ring together with needle-
nose pliers. Pull remaining components of automatic hub from wheel.
Installation
1) Ensure lock ring is in position. Using Bearing Nut Wrench
(J-6893-D), tighten wheel bearing adjusting nut to 50 ft. lbs. (60 N.\
m) to seat bearings.
2) Back off nut and tighten to 35 ft. lbs. (47 N.m) while
rotating hub. Finally, back off nut a maximum of 3/8 turn. Assemble
lock ring (with tab in keyway) over axle shaft, against bearing
adjustment nut.
3) Adjustment nut pin must pass through one of the washer
holes. Tighten outer adjusting nut to 183 ft. lbs. (248 N.m). Align
outer clutch housing splines with splines of wheel hub.
4) Loosen cover screws 3 or 4 turns, and push in on cover to
allow retaining ring to expand into rotor hub groove. Tighten cover
cap screws to 40-50 INCH lbs. (4.5-5.6 N.m).
Fig. 2: Selec-Trac Vacuum Control System
AXLE SHIFT MOTOR & HOUSING

mandrel rivets for tightness.
2) Use new 1/8" diameter by 1/4" long (1/8" grip) aluminum
blind rivets (if necessary). DO NOT use steel rivets as rivets must
shear upon impact. Position crossover load spring and shift lever in
gearshift housing. Tap pivot pin into place. See Fig. 5.
Fig. 5: Installing Column Shift Lever
Courtesy of Chrysler Motors
3) Assemble key cylinder plunger spring. Install assembly on
lock housing. Install shift lever gate on lock housing. Place shift
lever in mid position (if equipped). Seat lock housing on top of
jacket by aligning keyway in housing with slot in jacket. Install
housing-to-jacket screws. Tighten alternately to 90 INCH lbs. (10 N.
m).
4) Install dimmer switch rod by firmly pushing 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). Remove drill bits.
5) Switch should click when lever is lifted and again as
lever returns, just before it reaches stop in down position. Grease
and assemble 2 lock levers, lock lever spring and pin. See Fig. 6.
Install assembly into lock housing. Seat pin firmly in bottom of
slots. Ensure that lock lever spring leg is firmly in place in lock
casting notch. See Fig. 7.

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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with fluid.
LOW-REVERSE (REAR) BAND ADJUSTMENT









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Tighten Screw to Back Off
Application INCH Lbs. (N.m) Screw\
Model 727 ................. 41 (4.6 N.m.) .................... 2 Turns\
Model 904 ................. 41 (4.6 N.m.) .................... 7 Turns\
Model 999 ................. 41 (4.6 N.m.) .................... 4 Turns\









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TRANSMISSION THROTTLE CABLE/LINKAGE
NOTE: A special Idle Speed Actuator (ISA) Exerciser Box Tool is
required to initially set ISA motor and adjust transmission
throttle linkage on vehicles with transmission model 999
with 4-cylinder engines.
727 Transmission with 6-Cylinder Engines
1) Disconnect throttle control rod spring. Use spring to
hold transmission throttle control lever forward, against stop. Block
choke open and release fast idle cam.
2) On carburetors equipped with throttle operated solenoid
valve, turn key to "ON" position to energize solenoid. Open throttle
halfway to allow solenoid to lock. Return throttle to idle position.
3) Loosen retaining bolt on throttle control adjusting link.
DO NOT remove spring clip or nylon washer. Pull on end of link to
eliminate lash. Tighten link retaining bolt. Reconnect throttle
control rod spring.
727 Transmission with V8 engines
1) Disconnect throttle control rod spring. Use spring to
hold transmission throttle valve control lever against forward stop.
Block choke open and release fast idle cam.
2) On carburetors equipped with throttle operated solenoid
valve, turn key to "ON" position to energize solenoid. Open throttle
halfway to allow solenoid to lock. Return throttle to idle position.
3) Loosen retaining bolt on throttle control rod adjusting
link. Remove spring clip and slide nylon washer to rear of link. Push
on end of link to eliminate lash and tighten retaining bolt. Install
nylon washer and spring clip. Reconnect throttle control rod spring.
904 Transmission with 6-Cylinder Engines
1) Remove air cleaner. Hold throttle control lever rearward
against its stop. Block choke plate open and set carburetor linkage
completely off fast idle cam.
2) Unlock throttle control cable by lifting "T" shaped
adjuster clamp with small screwdriver. Move cable outer sheath
forward to remove any cable load on throttle cable bellcrank.
3) Adjust cable by moving cable and sheath rearward until
there is no lash between cable and throttle linkage. Lock cable by
pressing "T" shaped clamp downward until clamp snaps into place.
Install and reconnect any parts removed and/or disconnected.
999 Transmission with 4-Cylinder Engines
1) Raise vehicle. Using a spring, hook one end on throttle
control lever and other end on torque converter housing. Lower
vehicle.
2) Disconnect the ISA motor and connect Exerciser Box to
ISA. Adjustment light should turn off and ready light should turn on.
Press retrack button. Wait until ISA adjusts, ready light goes off
and adjust light goes on.