TROUBLESHOOTING THE HMMWV - OD1616 - LESSON 1/TASK 1
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
The drive gear is turned by the differential driven
halfshaft 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 wheel spindle.
The drive gear is turned by the
differential driven halfshaft.
The drive and driven gears are a
matched set replaced as a unit at the differentials.
arm and cover is connected to the center bar by the tie rod.
side cover is removed only for inspection purposes of the drive and
The suspension system's main purpose is to support the weight of the
Military vehicles, which are often very heavy and must be
able to cross all types of terrain, depend heavily on their
In wheeled vehicles, the suspension must not
only be effective over a wide range of conditions, but allow for
steering geometry and changes in terrain.
The suspension system is identical for all models of the HMMWV. The
HMMWV uses an independent coil spring suspension system.
suspension system consists of eight components, discussed in greater
detail in the following paragraphs.
Components of the Suspension System.
The following discussion
of the HMMWV suspension system components will be divided into two
The first deals with the components at the front wheels,
and the second will deal with the suspension components at the rear
(1) Front Wheel Suspension System Components.
In the paragraphs
that follow, the six suspension system components that are located at
each front wheel will be discussed.
The five components are the
upper and lower control arms, upper and lower ball joints, shock
absorbers, stabilizer bar, and geared hubs.