Standard Differential; Differential Operation; Differential Disassembly - Jeep J-10 Series 1982 Technical & Service Manual

AXLES - FRONT HUBS 2F-21
STANDARD DIFFERENTIAL
Page
Differential Operation 2F-21
Differential Overhaul—AMC/Jeep Rear Axles 2F-21
Differential Overhaul—Model 30-44-60 Front/Rear Axles 2F-30
GENERAL
CJ and Scrambler models use the Model 30 front axle
and an AMC/ Jeep rear axle which has tapered axle
shafts.
Cherokee, Wagoneer, and J-10 Truck models use the
Model 44F front axle and an AMC/Jeep rear axle with
flanged axle shafts. Truck models rated at 6800 GVWR
(3084 kg) and up use the Model 44F front axle and the
Model 60 rear axle with full-floating axle shafts.
The AMC/Jeep rear axles are semi-floating type axles.
Only the Model 60 is a full-floating type unit.
DIFFERENTIAL OPERATION
The differential gear system divides incoming torque
between the axle shafts allowing them to rotate at dif
ferent speeds when turning corners.
Each differential side gear is splined to an axle shaft.
The pinion gears are mounted on a pinion mate shaft
and are free to rotate on the shaft. The pinion gear is
fitted in a bore in the differential case and is positioned
at a right angle to the axle shafts.
In operation, power flow occurs as follows: The pinion
gear rotates the ring gear. The ring gear, which is bolted
to the differential case, rotates the case. The differential
pinion gears, which are mounted on the pinion mate
shaft, which is fitted in the case, rotate the side gears.
The side gears, which are splined to the axle shafts,
rotate the shafts.
During straight-ahead driving, the differential pinion
gears do not rotate on the pinion mate shaft. This occurs
because input torque applied to the gears is divided and
distributed equally between the two side gears. As a
result, the pinion gears revolve with the pinion mate
shaft but do not rotate around it (fig. 2F-29).
When turning corners, the outside wheel must travel
a greater distance than the inside wheel in order to
complete the turn. This difference must be compensated
for in order to prevent the wheels from scuffing and
sliding through the turn. To accomplish this, the differ
ential becomes effective allowing the axle shafts to ro
tate at unequal speeds (fig. 2F-30). In this instance, the
input torque applied to the pinion gears is not divided
equally. The pinion gears now rotate around the pinion
mate shaft in opposite directions. This allows the side
gear and axle shaft attached to the outside wheel to
rotate at a faster speed.
General
Specifications
IN STRAIGHT AHEAD DRIVING.
EACH WHEEL ROTATES AT 100%
OF CASE SPEED
PINION GEARS ROTATE
WITH CASE
Page
2F-21
2F-39
A50113
Fig. 2F-29 Differential Operation—Straight Ahead Driving
/
OUTER WHEEL
110% CASE SPEED
AXLE£
100% DIFFERENTIAL
CASE SPEED
PINION GEARS ROTATE
ON PINION SHAFT
/
INNER WHEEL
30% CASE SPEED
A50114
Fig. 2F-30 Differential Operation—On Tarns
DIFFERENTIAL OVERHAUL—AMC/JEEP REAR AXLES
Differential Disassembly
NOTE: It is not necessary to remove the rear axle as
sembly in order to overhaul the differential Refer to
figure 2F-31 for parts nomenclature during overhaul.
(1) Remove axle shaft dust caps and retaining nuts.
(2) Raise and support vehicle.
(3) Remove axle housing cover and drain lubricant.