THEORY OF OPERATION - CONTINUED
AIR AND BRAKE SYSTEMS
A gear-driven, two-cylinder air compressor mounted
at the left forward
side of the engine provides air pres-
sure for the service brakes. A dual section air reservoir is connected by air lines and mounted under the rear of the
machine. A governor controls the pressure.
Service Brakes. A foot pedal operated air valve in the cab directs air pressure through air lines for engaging multiple oil
disc brake assemblies for each wheel, within the tandem and spindle housings.
Parking/Emergency Brakes. Multiple oil disc-type located in the transmission case. Manually actuated by forward
movement of red lever on transmission control console. Lever engages parking brake and activates transmission neutral
lock to prevent machine movement. Brake is spring engaged and air disengaged. Can be used for emergency stopping if
air supply fails.
Emergency Braking. Dual air system provides separate circuit at each tandem for safety. Malfunction of one circuit
leaves remaining circuit with at least half of original braking capacity.
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 major systems comprising the electrical system are:
Monitoring system panel
Service, work, and blackout lights