TM 5-3805-296-10
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AIR AND BRAKE SYSTEMS
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1. General. The air system consists of an engine-driven air compressor, three air tanks and related lines, hoses,
and valves. The system provides the required air to operate the machine's service and park brakes, differential
control lock valve, transmission hold control valve and air horn.
2. Service Brakes. All-wheel, air-activated, drum brakes with floating-type linings and cam actuators. A foot-
operated control valve in the operator compartment controls the system.
3. Park Brake. The park brake operates on all wheels using the same actuators as the service brakes. When the
park brake control knob is pulled out, air pressure is exhausted from the brake cylinder and spring pressure is
applied. When the control knob is pressed in, air pressure is applied to the cylinder and the park brake is
released. A spring override actuates brakes in the event of low air pressure or broken air lines. This override is
deactivated when the system air pressure is above 60 psi (414 kPa). A warning horn sounds in the operator
compartment when system air pressure falls below 65 psi (448 kPa).
Figure 3. Air and Brake System.
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