THEORY OF OPERATION - CONTINUED
AIR AND BRAKE SYSTEMS - CONTINUED
Parking Brake. The parking brake is an air released/spring applied type of parking brake system. When the parking
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 parking brake is released.
The electrical system consists of two 12-volt batteries connected in series, with negative grounding, providing 24 volts
to operate the electrical systems and components.
The system contains all the necessary switches, circuit breakers, fuses, relays, harnesses, and connectors to operate the
machine, including a NATO slave receptacle.
The three major systems comprising the electrical system are:
starting and charging systems;
service, work, and blackout lights; and
EMS monitoring and alarm system.