Jeep 1996 Grand Cherokee Service Manual page 110

ZJ
DISASSEMBLY AND ASSEMBLY (Continued)
(10) Rotate case with Turning Bar 6960–2 until
mate shaft holes in pinion gears align with holes in
case.
(11) Tighten forcing screw to 122 N·m (90 ft. lbs.)
to compress the Belleville springs. Lubricate and
install thrust washers behind pinion gears and align
washers with a small screw driver. Insert mate shaft
into each pinion gear to verify alignment.
(12) Remove forcing screw, threaded adapter and
step plate. Install pinion gear mate shaft, align holes
in shaft and case.
(13) Install the pinion mate shaft lock screw finger
tight to hold shaft during installation.
If replacement gears and thrust washers were
installed, it is not necessary to measure the
gear backlash. Correct fit is due to close
machining tolerances during manufacture.
(14) Lubricate all differential components with
hypoid gear lubricant.
CLEANING AND INSPECTION
AXLE COMPONENTS
Wash differential components with cleaning solvent
and dry with compressed air. Do not steam clean
the differential components.
Wash bearings with solvent and towel dry, or dry
with compressed air. DO NOT spin bearings with
compressed air. Cup
replaced as matched sets only.
Clean axle shaft tubes and oil channels in housing.
Inspect for;
• Smooth appearance with no broken/dented sur-
faces on the bearing rollers or the roller contact sur-
faces
• Bearing cups must not be distorted or cracked
• Machined surfaces should be smooth and with-
out any raised edges
• Raised metal on shoulders of cup bores should
be removed with a hand stone
• Wear and damage to pinion gear mate shaft,
pinion gears, side gears and thrust washers. Replace
as a matched set only.
• Ring and pinion gear for worn and chipped teeth
• Ring gear for damaged bolt threads. Replaced as
a matched set only.
• Pinion yoke for cracks, worn splines, pitted
areas, and a rough/corroded seal contact surface.
Repair or replace as necessary.
• Preload shims for damage and distortion. Install
new shims if necessary.
TRAC-LOK
(1) Clean all components in cleaning solvent. Dry
components with compressed air.
and bearing must
DIFFERENTIAL AND DRIVELINE
(2) Inspect clutch pack plates for wear, scoring or
damage. Replace both clutch packs if any one compo-
nent in either pack is damaged.
(3) Inspect side and pinion gears. Replace any gear
that is worn, cracked, chipped or damaged.
(4) Inspect differential case and pinion shaft.
Replace if worn or damaged.
PRESOAK PLATES AND DISC
Plates and discs with fiber coating (no grooves or
lines) must be presoaked in Friction Modifier before
assembly. Soak plates and discs for a minimum of 20
minutes. Add remaining Friction Modifier to differen-
tial after assembly.
ADJUSTMENTS
PINION GEAR DEPTH
GENERAL INFORMATION
Ring and pinion gears are supplied as matched
sets only. The identifying numbers for the ring and
pinion gear are etched into the face of each gear (Fig.
55). A plus (+) number, minus (–) number or zero (0)
is etched into the face of the pinion gear. This num-
ber is the amount (in thousandths of an inch) the
depth varies from the standard depth setting of a
pinion etched with a (0). The standard setting from
the center line of the ring gear to the back face of the
be
pinion is 96.8 mm (3.813 inches) for Model 44 axles.
The standard depth provides the best teeth contact
pattern. Refer to Backlash and Contact Pattern Anal-
ysis Paragraph in this section for additional informa-
tion.
Fig. 55 Pinion Gear ID Numbers
NOTE: The button end on the pinion gear head is
no longer a machined–to–specifications surface. Do
not use this surface for pinion depth setup or
checking (Fig. 56).
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