TROUBLESHOOTING THE HMMWV - OD1616 - LESSON 1/TASK 1
and allows them to rotate at different speeds when cornering.
The
dual drive differential is a limited slip (torque biasing)
differential. It resists spinout by transferring more torque to the
drive wheel that has the most resistance to spinout.
A standard
differential has no such provision. The differentials are mounted up
between the frame rails to minimize drive line vibration, external
damage, and to increase ground clearance.
The front and rear
differentials are identical and are interchangeable providing that
the yoke is changed. The differential uses gear oil (GO) 80/90.
(6) Axle Half shafts.
The HMMWV uses axle drive shafts
(halfshafts) to accommodate the independent suspension system.
The
purpose of the halfshafts is to transfer torque to the wheels from
the differential through the geared hub.
The unit is basically a
one-piece assembly with boots on both the inboard (differential) and
outboard (geared hub) ends.
The inboard end is bolted to the
differential side flange and the outboard end is splined to the drive
gear of the geared hub.
The inboard boot encloses a constant
velocity joint which accommodates the in-and-out and angular motion
of the axle drive shaft with no change to either system.
The outer boot encloses a constant velocity joint which transmits
torque through various steering angles to the geared hub. The outer
constant velocity joint end of the shaft assembly is held in place by
the axle shaft retaining bolt located opposite the pipe plug in the
geared hub.
The inner housing is held in place by both the
differential output flange bolts and the caliper mounting brackets.
NOTE
The
inner
and
outer
velocity
joints
and
halfshafts are serviced as assemblies only.
(7) Geared Hub.
The geared hub has a gear box located at the
wheel ends that serves as the front wheel spindle.
It can be
considered the final drive unit. It permits attainment of up to 16
inches of ground clearance without damaging the
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