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C
AXLES
2F-41
However, if one wheel slips, the opposite wheel will
generate only as much torque as the slipping wheel.
With Trac-Lok, part of the ring gear torque is trans-
mitted through clutch packs located between the differ-
ential side gears and case. The clutch packs contain
multiple disc clutches which have radial grooves on the
plates and concentric grooves on the discs.
In operation, the Trac-Lok clutches are engaged by
two concurrent forces. The first being preload force
exerted through Belleville springs contained within the
clutch packs and the second is from separating forces
generated by the side gears as torque is applied through
the ring gear. -
The Trac-Lok design provides the normal differential
action needed for turning corners and for the trans-
mittal of equal torque to both wheels when driving
straight ahead. However, when one wheel loses traction
and spins, the clutch packs transfer additional torque to
the wheel having the most traction. Trac-Lok differen-
tials resist wheel spin on bumpy roads and provide more
pulling power when one wheel loses traction. Pulling
power is provided continuously until both wheels lose
traction. If both wheels slip due to unequal traction,
Trac-Lok operation is normal. In extreme cases of differ-
ences in traction, the wheel with the least traction may
spin after the Trac-Lok has transferred as much torque
as possible to the nonslipping wheel.
LUBRICATION
The Trac-Lok differential requires a special lubricant.
Ordinary multipurpose gear lubricants m u s t not be
used. Use Jeep Trac-Lok Lubricant or equivalent only.
In addition, the only acceptable method for cleaning the
Trac-Lok differential is by disassembling the unit and
wiping it clean with shop towels.
NOTE: Trac-Lok differentials
are serviced at the same
time intervals as standard
differentials.
Trac-Lok Lubricant Changs
(1) Warm axle lubricant. Operate vehicle in gear, on
hoist, with wheels off floor for minimum of 5 minutes at
30 mph.
WARNING: Never
attempt
to operate
a
Trac-Lok
equipped vehicle in gear with only one wheel raised. The
vehicle could propel itself off the jack and cause damage
or personal
injury.
(2) Stop engine and raise vehicle on hoist.
(3) Remove axle housing cover drain plug or cover
and drain lubricant while warm (only).
(4) Remove any residual lubricant from axle hous-
ing using shop cloths.
(5) Install drain plug. If axle housing cover was
removed, clean cover and housing mating surfaces and
apply Jeep Gasket-In-A-Tube or equivalent silicone
sealer to cover and housing mating surfaces. Install
cover and cover bolts. Tighten cover bolts to 20 foot-
pounds (27 N*m) torque.
(6) Refill axle housing with Trac-Lok lubricant or
equivalent only. Refer to Specifications for lubricant
capacities of various axle models.
(7) Operate vehicle on road for approximately ten
miles (16 km). Make at least ten figure-eight turns to
flush old lubricant out of clutch packs.
(8) Return vehicle to shop and raise vehicle on hoist.
(9) Drain and replace axle lubricant again. If axle
housing cover is removed, be sure to clean cover and
housing mating surfaces and reapply Jeep Gasket-In-A-
Tube or equivalent silicone sealer to mating surfaces
before reinstalling cover.
(10) Lower vehicle.
(11) Road test vehicle and verify proper Trac-Lok
operation.
NOTE: If a slight chatter occurs after flushing
and
refilling the Trac-Lok differential,
drive the vehicle an
additional
ten to twenty miles (16 to 32 km) or until
chatter stops. If the chatter persists after twenty (32
km) or more miles of driving, an overhaul may be
necessary.
OIACNOSIS
If noisy or rough operation such as chatter occurs
when turning corners, the most probable cause is in-
correct or contaminated lubricant. Before removing the
Trac-Lok unit for repair, drain, flush, and refill the axle
with the specified lubricant. Refer to the lubricant
change procedure under Lubrication. A complete lubri-
cant drain and refill with the specified lubricant will
usually correct chatter.
Trac-Lok Operational Test
Trac-Lok operation can be checked quickly using the
following test.
(1) Position one wheel on solid, dry pavement and
opposite wheel on ice, mud, grease, or similiar low trac-
tion surface.
(2) Increase engine rpm gradually to obtain max-
imum traction prior to breakaway. Ability to move ve-
hicle effectively will demonstrate proper performance.
NOTE: If the test is performed on extremely slick sur-
faces such as ice or grease coated surfaces, some ques-
tion may exist as to proper performance.
In
these
extreme cases, a properly performing
Trac-Lok will pro-
vide greater pulling power by lightly applying the park-
ing brake.
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Troubleshooting
