TM 9--2350--292--20--1
DRIVER’S CONTROLS OVERVIEW AND DIAGRAMS.
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THIS WORK PACKAGE COVERS:
Driver’s Controls Overview And Diagrams
The driver’s controls consists of the vehicle steering wheel, transmission shifting lever, brake pedal, purge pump,
accelerator pedal, and associated linkages.
The vehicle steering wheel is connected by rods and linkage to a steering lever mounted on the steering valve body
on the transmission. Movement of the steering wheel actuates the steering valve in the transmission controlling
track movement for steering. The transmission shifting lever is connected to the transmission by rods and linkage.
The shifting lever is used to select a desired driving range or direction (forward or reverse).
(Old configuration) The brake pedal is connected by rods and linkage to left and right side brake levers which are
connected to the brakes. Also the brake pedal is connected by linkage to the steering linkage. When the brake
pedal is applied it locks up with the steering. As a result, a hand brake is not needed. The brake pedal is assisted
by an electrically operated pump, motor, relay, 80--amp circuit breaker, and associated wiring.
(New configuration with brake modulation) The brake pedal is mechanically connected to the brake modulation
valve. When the brake pedal is depressed, the output pressure from the modulation valve increases, causing the
brake hydraulic cylinder rod assembly to move. As a result of this movement, the brake rods, linkage and cables to
the left and right side brake levers, which are connected to the vehicle’s brakes also move. The hydraulic cylinder
rod assembly also controls the linkage that is connected to the steering linkage. When the brake pedal is fully de-
pressed, it locks up the steering and as a result, a hand brake is not required. The brake pedal is assisted by a
hydraulic pump and motor, pressure switches and regulators, relay and electrical power and associated wiring.
The accelerator pedal is connected by linkage and throttle rods to the engine. Depressing the accelerator pedal
increases the flow of fuel to the engine and increases vehicle speed. The purge pump is an electrical/mechanical
pump mounted on the engine and is used to purge air from the fuel lines. The purge pump is connected in line with
the fuel lines and fuel pump. The purge pump is activated by turning on the engine preheat switch and the switch
panel.
OLD CONFIGURATION
NEW CONFIGURATION
WITH BRAKE MODULATION
END OF TASK
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