TROUBLESHOOTING THE HMMWV - OD1616 - LESSON 1/TASK 1
The upper and lower control arms connect the geared hubs to the frame
The geared hub is joined to the control arms by the ball
joints bolted to the outer end of each arm. The arms pivot on rubber
bushings to maintain the alignment of the geared hub with the vehicle
frame. The steel coil spring, mounted between the lower control arm,
and a frame-mounted bracket maintains the proper ride height.
Mounted within the springs are heavy-duty shock absorbers.
springs support the frame and body, but the shock absorbers work with
the springs to control movements of the body, frame, and wheel
converting the energy of motion into heat.
The shock absorbers are
called double-acting because they dampen motion in both directions of
(2) The stabilizer bar is transverse-mounted on the frame side
sill to the rear of the lower control arms. The bar is attached with
rubber bushings and clamps and is connected to the lower arms by link
bolts with rubber bushings at both ends. The stabilizer bar provides
added roll-resistance by counteracting independent motion from either
side of the front suspension. Tie rods connect the geared hubs and
wheels to the steering linkage on the front suspension, and spherical
ball joints allow turning movement transmitted by the steering
Components of the Rear Suspension System.
The rear suspension
system components are identical to the front suspension system
components, with the exception of the radius rod.
The radius rod
attaches the geared hub (in the rear).
In the front this is done
through the use of the tie rod.
In the preceding paragraphs, the drive train and suspension system
used in the HMMWV were discussed. The characteristics and operation
of the HMMWV brake/steering system will be discussed next.
The service brake system on the HMMWV is a four wheel hydraulic disc