INTRODUCTION TO THE HMMWV - OD1615 - LESSON 2/TASK 1
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.
The inner and outer velocity joints and half shafts
are serviced as assemblies only.
h. 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 front or rear differentials. The geared hub
also provides a lower gear ratio (1.92:1).
The geared hub includes a drive gear and a driven gear enclosed in a
housing. The drive gear is turned by the differential driven half shaft and
powers the driven gear which turns the wheel spindle.
The geared hub is joined to the upper and lower control arm by ball joints
bolted to the outer end of each arm.
The driven gear is splined to the
The drive gear is turned by the differential driven half
shaft. The drive and driven gears are a matched set replaced as a unit at
The steering arm and cover is connected to the center
bar by the tie rod.
The side cover is removed only for the purpose of
inspecting the drive and driven gears.
The suspension system's main purpose is to support the weight of the
vehicle. Military vehicles, which are often very heavy and must be able to
cross all types of terrain, depend heavily on their suspension systems. In
wheeled vehicles, the