1988 JEEP CHEROKEE lock

REAR HUB BEARING ADJUSTING SPECIFICATIONS








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Application ( 1) Ft. Lbs. (N.m)
Adjusting Nut
Step 1 ............................... 50 (68)
Step 2 .......................... Back Off 45

Lock Nut ............................... 50 (68)
( 1) - While rotating hub.









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6) Install new axle flange gasket or apply silicone sealer.
Install axle and tighten bolts or nuts to proper specification. See
TORQUE SPECIFICATIONS table at end of this article.
Fig. 2: Rear Hub & Bearing Adjuster
REAR AXLE ASSEMBLY R & I

Fig. 6: Installing New Front Axle Shaft Seal
AXLE SHAFT OVERHAUL
NOTE: All front axle shafts except (Select-Trac) use Cardan "U"
joints and should be overhauled in same manner as drive
shaft "U" joints.
DISASSEMBLY (SELECT-TRAC)
1) Cut and remove both outer boot clamps. Slide boot off
outer CV joint.
2) Using a block of wood seated on inner race, tap joint from
shaft. If shaft is clamped in a vise, be sure to use protective vise
jaws.
3) Tap outer CV cage with a brass punch until cage is tilted

discard. Tap ring gear loose with soft mallet. If ring gear runout
measured earlier exceeded .006" (.15 mm), repeat runout measurement of\
case without ring gear. Total runout of case should not exceed .003"
(.08 mm).
7) Using Flange Holder Wrench (C-3281), remove drive pinion
nut and washer. Using holder wrench and Flange Puller (C-452), remove
drive pinion flange. Using Pinion Seal Puller (C0748), remove pinion
oil seal. Remove slinger, gasket, outer pinion bearing and preload
shim pack.
8) Remove drive pinion with inner bearing. Remove inner and
outer pinion bearing races. Remove and note thickness of shim pack
behind inner bearing race. Remove inner pinion bearing from pinion
shaft using Puller Press (DD-914-P) with Adapter Ring (DD-914-9) and\
Pinion Bearing Puller Plates (C-293-39 on Model 44; DD-914-37 on Model
60 and 61; DD-914-95 on Models 70 and 80).
NOTE: Pinion bearing adjusting shims may remain on pinion shaft,
stick to bearing or fall loose. Collect and save them for
reassembly.
9) Remove side bearings with Bearing Puller (C-293-PA),
Extension Plug (C-293-3 on Model 44; DD-914-7 on Models 60, 61, 70 and
80) and Puller Plates (C-293-18 on Model 44; DD-914-62 on Models 60,
61, 70 and 80). Record shim thickness and location for reassembly
reference.
10) If differential case is a one-piece unit, drive out lock
pin holding differential pinion shaft to case. Remove differential
pinion shaft, gears and thrust washers (one for each gear).
11) If differential case is a 2-piece unit, mark both
differential case halves to aid reassembly in correct position. Remove
bolts holding case halves together. Tap on top half of case to break
it loose from lower half. Remove top half of case. Remove pinion gear
spider, pinion gears, side gears and all thrust washers.
INSPECTION
1) Use cleaning solvent to rinse gears and bearings. Check
large end of bearing rollers where wear, if any, is evident. Check
pinion and flange splines for excessive wear. Ensure ring gear teeth
are in good condition.
2) Check differential case for cracks, scoring of side gears,
thrust washers and pinion thrust faces. Check fit of side gears to
case and to axle shaft splines. Look at pinion shaft and spacer for
scoring or excessive wear.
REASSEMBLY & ADJUSTMENTS
1) When reassembling and adjusting ring and pinion assembly,
pinion depth, pinion bearing preload, side bearing preload and
backlash between ring and pinion must be adjusted.
2) If only pinion shaft and ring gear are to be replaced and
carrier housing can be reused, compare pinion depth adjustment numbers
etched in faces of old and new pinion heads. See Fig. 10. Using
PINION DEPTH SHIM ADJUSTMENT SPECS table, correct shims can be
selected for new pinion shaft depth adjustment.

Lubricate all parts with gear oil. On one-piece case, place side gears
and new thrust washers in case. Place differential pinions and new
thrust washers in case. Rotate side gears until holes in pinion gears
and washers line up with holes in case. Install differential pinion
shaft. Install lock pin after aligning hole in shaft with hole in
case. Peen edge of hole to keep pin in place.
6) On 2-piece case, Install side gears and new washers with
pinion gears and cross shaft into half of case that is flanged. Put
top half of case on bottom half. Align scribe marks made before
disassembly. Tighten all bolts finger tight. Tighten bolts alternately
to 65-70 ft. lbs. (88-95 N.m).
7) On all one and 2-piece case units, inspect ring gear and
case for any burrs or nicks. Install ring gear and tighten NEW ring
gear bolts evenly in alternating pattern to specification.
8) Install Master Bearings into case. Use (D-135) for Model
44 or (D-117) for Models 60, 61, 70 and 80. Install differential case
in carrier. Install and tighten side bearing caps finger tight over
master bearings. Caps must be in same location as marked during
disassembly. Mount dial indicator on carrier with indicator tip
against back of ring gear.
9) Pry case assembly to one side of carrier. Zero dial
indicator and pry case in opposite direction. See Fig. 13. Record
reading. This indicates thickness of shim pack necessary to eliminate
clearance between case and side bearing races.
10) Actual placement of shim pack and necessary preload will
be calculated after drive pinion is installed and pinion depth has
been determined. Remove dial indicator. Remove bearing caps and
differential case from carrier.
NOTE: If new differential side and pinion gears are used with new
washers, gear backlash should be correct due to close
machine tolerances. If old gears and/or washers are used,
gear backlash must be checked.
Fig. 13: Measuring Differential Case End Play
NOTE: If original ring and pinion is to be used, measure old shim
packs and make up packs of same dimensions with new shims.
Baffles are considered part of shim pack.

PINION DEPTH
1) Depth Gauge Set (D-271) is used to determine pinion depth\
.
Place Master Pinion Block (D-139 on Model 44; D-120 on Model 60 and
61; D-137 on Model 70; T80T-4020-F42 on Model 80) in pinion bore of
carrier. Put Arbor Discs (D-115-4-44 on Model 44; D-116-2 on Models
60,61 and 70; (T88T-4020-A) on Arbor (D-115-3). Install arbor in
carrier with discs riding in bearing bore.
2) Put Pinion Height Block (D-115-1-44 on Model 44; D-116-1
on Models 60, 61, 70 and 80) on top of master pinion block with side
against arbor. Place Scooter Block (115-2) with Dial Indicator (D-106\
-
5) on small step of pinion height block. Zero dial indicator with
scooter block flat on pinion height block.
3) Move scooter block so dial indicator tip touches arbor.
Move block back and forth (perpendicular to arbor) to get highest
reading. This reading, plus or minus value etched on pinion head, is
thickness of shim pack necessary for pinion bearing.
4) On Model 80, Use Gauge Tube (D81T-4020-F51) and Gauge
Block (D81T-4020-F56) to determine required thickness of shim pack.
5) On all models, measure shims separately with micrometer.
If baffle is used, its thickness must be included in shim pack. This
is also true if slinger is used between inner bearing and head of
pinion shaft. Place pinion height shim pack in carrier bore for inner
bearing race. Drive bearing race into carrier, making sure cup is
fully seated.
PINION BEARING PRELOAD
1) Drive outer pinion bearing into carrier housing. Press
inner pinion bearing onto pinion shaft using Press Tube (C-3095-A).
Ensure bearing seats fully. Insert pinion shaft into carrier. Install
outer bearing, slinger (if equipped), flange, washer and nut.
NOTE: Pinion preload shims and oil seal should NOT be installed at
this time.
2) Using an INCH lb. torque wrench, tighten pinion nut until
10 INCH lbs. (1.13 N.m) rotational torque is required to move pinion
shaft. Recheck pinion depth with arbor and discs at this time. Place
pinion height block on face of pinion shaft.
3) Place dial indicator on small step of height block for
Model 44, 60 and 61 axles. Place dial indicator on high step of block
for Models 70 and 80 axles. Zero dial indicator and move it across
arbor to get highest reading. If reading is within .002" (.05 mm) of
etching on pinion face, pinion depth is correct.
NOTE: If pinion depth is not with .002" (.05 mm) of etched number
on face of pinion, shim pack under inner bearing race must
be changed before proceeding with differential settings.
4) Remove pinion nut, washer, flange, slinger and outer
bearing. Place preload shims (removed during disassembly) on pinion.
Install bearing and slinger. After lightly coating lips with gear oil,
install pinion seal in carrier housing. Install flange, washer and NEW
pinion nut. Tighten nut to specification. See TORQUE SPECIFICATIONS
table at end of this article.
5) Using an INCH lb. torque wrench, measure preload
(rotational torque) of pinion shaft. Rotational torque required to
keep pinion shaft turning freely and smoothly should be 20-40 INCH
lbs. (2.3-4.5 N.m). If preload needs to be increased, remove a few
shims and recheck. To decrease preload, add a few shims and recheck.
See Fig. 14 .

perform overhaul.
1) Raise and support rear of vehicle. Remove rear cover and
drain lubricant. Remove wheels, brake drums, hubs and axle shafts.
2) Mark differential bearing caps for reassembly reference
and loosen them until a few threads remain engaged. Pry differential
loose and remove bearing caps and differential from housing.
3) Mark bearing caps, races and shims for reassembly
reference. Remove differential side bearings with a puller. Remove
differential and ring gear from case. Remove pinion shaft lock pin.
4) Using 2 feeler gauges, measure differential side gear
clearance. Insert an equal distance feeler gauge between each side
gear and case. Continue checking clearance until each feeler gauge is
a tight drag fit. Ensure side clearance does not exceed .007" (.18 mm)\
on either side. If side gear clearance exceeds specification, replace
side gear thrust washers.
5) Remove pinion yoke and nut. Retain pinion nut for pinion
depth adjustment during reassembly. Tap pinion gear end with a soft
faced mallet to release it from front bearing. Remove pinion gear,
pinion bearings and preload collapsible spacer. Discard collapsible
spacer.
6) Remove pinion seal and pinion rear bearing cup. Remove and
retain pinion depth shim located under rear bearing cup. Remove pinion
front bearing cup. Using a press, remove pinion gear rear bearing.
CLEANING & INSPECTION
Clean all components in solvent and dry with compressed air.
Inspect all components for excessive wear or damage and replace as
necessary.
REASSEMBLY
NOTE: Ensure correct shims have been chosen to obtain proper
ring gear backlash and bearing preload before reassembly.
See ADJUSTMENTS in this article.
Drive Pinion
1) Press rear bearing on pinion stem with large diameter of
roller cage toward gear. Clean housing bearing bores. Place shim in
rear bearing bore and install rear bearing cup.
NOTE: When installing a new gear set, use original depth shim as a
starting point. Chamfered side of shim must be installed to
bottom side of rear bearing cup bore.
2) Install front bearing cup into housing. Install drive
pinion through rear bearing cup. Install front bearing, yoke and
original pinion nut. Tighten nut to remove bearing end play only.
NOTE: A new nut and collapsible spacer are not installed at this
time, as pinion will be removed after a depth measurement.
Differential Case
1) Assemble side gears and thrust washers and install into
differential case. Ensure side gear thrust washers were replaced in
clearance measured at disassembly was greater than .007" (.18 mm).
2) Install differential pinions and thrust washers in case.
Ensure pinions are aligned with shaft bores. Recheck side gear
clearance. If clearance exceeds .007" (.18 mm), side gears must be
replaced.
3) Install differential pinion shaft and lockpin. Using
Remover (J-22912-01), remove differential bearings. Install correct

article and determine amount to be added or subtracted from original
shim thickness to obtain starter shim thickness. DO NOT use starter
shim thickness as a final shim setting.
6) Install rear bearing on pinion gear. On heavy duty rear
axle, large end of bearing faces gear end of pinion. Press bearing
against rear face of gear.
7) On all axles, clean pinion bearing bores in axle housing
to ensure accurate measurement. Install and center starter shim in
housing bearing cup bore. If shim is chamfered, ensure chamfered side
faces bottom of bearing cup bore.
8) Install pinion rear and front bearing cups. Install pinion
gear in rear bearing cup and install pinion front bearing and yoke on
pinion gear. DO NOT install oil seal or collapsible spacer at this
time. Install and tighten original pinion nut only enough to remove
end play. Determine depth variance marked on pinion gear.
9) Install Arbor (J-5223-4) and Discs (J-5223-23) in
differential bearing cup bores. Ensure discs are fully seated in
bearing cup bores. Install bearing caps over discs and install bearing
cap bolts. Tighten bolts, but not to specified torque.
10) Position Gauge Block (J-5223-20) against end of drive
pinion with Clamp (J-5223-24) and Bolt (J-5223-29). See Fig. 4. Extend
clamp bolt until it presses against gauge block enough to prevent
gauge block from moving.
11) Loosen thumbscrew in end of gauge block to allow plunger
to contact arbor. When plunger contacts arbor, tighten thumbscrew,
taking care not to disturb plunger position.
12) Remove gauge block and measure distance from end of anvil
to top of plunger head, using a 2-3" (51-76 mm) micrometer. Record
this measured pinion depth for future reference.
13) Remove gauging tools, drive pinion and rear bearing cup.
Remove drive pinion depth shim and record thickness. Add shim
thickness to measured pinion depth. From this total subtract desired
pinion depth. For an example, see DETERMINING CORRECT SHIM THICKNESS
table.
DETERMINING CORRECT SHIM THICKNESSES









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Application In. (mm)
Standard Drive Axle
Standard Pinion Depth .............................. 2.095 (53.21)\
Pinion Depth Variance ............................... - .004 (.10)\
Desired Pinion Depth .............................. =2.091 (53.11)\
Measured Pinion Depth .............................. 2.100 (53.34)\
Starting Shim Thickness ............................ + .096 (.096)\
Total Measured Thickness Depth .................... =2.196 (55.77)\
Total Measured Pinion Depth ........................ 2.196 (55.77)\
Desired Pinion Depth .............................. -2.091 (53.11)\
Correct Shim Thickness .............................. =.105 (2.66)\
Heavy Duty Drive Axle
Standard Pinion Depth .............................. 2.547 (64.69)\
Pinion Depth Variance ............................... + .007 (.18)\
Desired Pinion Depth .............................. =2.554 (64.87)\
Measured Pinion Depth .............................. 2.550 (64.77)\
Starting Shim Thickness ............................. +.098 (2.49)\
Total Measured Pinion Depth ....................... =2.648 (67.26)\
Total Measured Pinion Depth ........................ 2.648 (67.26)\
Desired Pinion Depth .............................. -2.554 (64.87)\
Correct Shim Thickness .............................. =.094 (2.39)\









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14) The result represents correct shim thickness to be
installed. Install correct thickness shim in rear bearing bore and

FLANGES
FLEX PLATES
FLUID LEVEL INDICATORS
FLUIDS AND LUBRICANTS
FLYWHEELS
FORCE MOTORS
GUIDES
HALF SHAFTS
HOSES, LINES AND TUBES
HOUSINGS (BELL, CASE, TAIL (EXTENSION) AND AUXILIARY)
INTERMEDIATE SHAFT SUPPORT BEARINGS
KEY INTERLOCK SYSTEMS
LIMITED SLIPS
LINES
LINKAGES (EXTERNAL)
LOCKING HUB ASSEMBLIES
LOCKING HUB CONTROL KNOBS
LUBRICANTS
METAL-CLAD SEALS
METALASTIC JOINTS
MODULATOR PINS
MODULATORS
MOUNTS (ENGINE, TRANSAXLE AND TRANSMISSION)
ODOMETER DRIVES (MECHANICAL)
ODOMETER HEADS (MECHANICAL)
OIL PANS
PANS
PILOT HOLES
PRESSURE PLATES
PRESSURE SWITCHES
RACES
RUBBER JOINTS (METALASTIC)
SCREENS
SEALS
SEALS (METAL-CLAD)
SELECTOR INTERLOCK SYSTEMS
SERVOS
SHIFT INTERLOCK SYSTEMS (SELECTOR AND KEY INTERLOCK SYSTEMS)
SENSORS
SIDE COVERS
SLIP YOKES
SOLENOIDS
SPEED SENSORS (ELECTRONIC WHEEL AND VEHICLE)
SPEEDOMETER-DRIVEN GEAR HOUSINGS
SPEEDOMETER/ODOMETER DRIVES (MECHANICAL)
SPEEDOMETER/ODOMETER HEADS (MECHANICAL)
SPEEDOMETERS AND ODOMETERS (ELECTRONIC)
SWITCHES
TONE WHEELS
TOOTHED RINGS (TONE WHEELS)
TORQUE CONVERTERS
TRANSAXLE MOUNTS
TRANSDUCERS (TRANSMISSION)
TRANSMISSION COOLERS
TRANSMISSION MOUNTS
TRANSMISSION PANS
TRANSMISSION RANGE INDICATORS (PRNDL)
TUBES
UNIVERSAL JOINTS (CARDON OR CROSS TYPE)
VACUUM CONTROLS
VACUUM HOSES
VACUUM MOTORS
VACUUM-OPERATED SWITCHES