Section III. TECHNICAL PRINCIPLES OF OPERATION
a. This section explains how systems and components of the 5-ton, M809 series
vehicles work together. A functional description of these systems and components and
their related parts is covered as follows:
Except where specifically noted, these systems and components are
generally applicable to all vehicles covered in this manual.
b. Refer to applicable paragraphs of this manual for detailed operating instructions for
these systems and their components.
(1) Electrical System Operation: Paragraph 1-20. This paragraph describes how
electrical power is supplied to the components that control the vehicle and provide
(2) Compressed Air System Operation: Paragraph 1-21. This paragraph describes
how filtered air is compressed and supplied to the components that slow down and stop
the vehicle, as well as the air-actuated accessories throughout the vehicle.
(3) Service Brake System Operation: Paragraph 1-22. This paragraph describes how
the air-hydraulic system provides mechanical power to the vehicle brake components to
slow or stop the vehicle.