Lesson 2/Learning Event 1
LESSON 2
FUNDAMENTALS OF AXLE ASSEMBLIES
TASK
Describe the fundamentals of axle assemblies.
CONDITIONS
Given information about the construction, operation, lubrication, and maintenance of axle
assemblies; types and principles of axle shafts; and principles of bevel gear differentials.
STANDARDS
Answer 70 percent of the multiple-choice test items covering fundamentals of axle
assemblies.
REFERENCES
TM 9-8000
Learning Event 1:
DESCRIBE THE TYPES, CONSTRUCTION, AND PURPOSE OF AXLE ASSEMBLIES
The term "wheeled vehicle" means that wheels are used to support the weight of the
vehicle and to propel the vehicle, not tracks, runners, or skids. To do this job, wheels
must be secured to a device that holds them in position so that they can roll and support
the load. This device is called an axle.
An axle is a cross-support between the wheels. The strength and design of an axle
assembly depend on what it is supposed to do. Think of a front axle, and you can see
that it must support the wheels so that they will roll and also turn in different directions
for steering. Now, think of a rear axle; it does not need steering ability, but it does have
to deliver energy to the wheels to make the vehicle move.
There are two major types of axles: the dead axle, used for the front of a vehicle if the
wheels are not powered, and the live axle for the rear where the wheels must be made to
rotate.
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