THEORY OF OPERATION - CONTINUED
AIR BRAKE SYSTEM
Air Compressor and Reservoir.
A gear driven, two cylinder air compressor mounted
at the left forward
side of the
engine provides air pressure 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. On Type I and Type II machines, an air dryer is
mounted above the battery box on the right side.
(TYPE I AND II MACHINES)
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 Brake. Multiple oil disc type parking/emergency brake is located in the transmission case. It is
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. Brake
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.
Blade Centershift Lock Pin. Though not part of the air brake system, the centershift lock pin is mentioned here
because it also is operated by the air supply from the air brake system. The centershift lock pin is part of the blade sys-
tem. Refer to Blade System in this work package for its location.
WHEELS AND TIRES
The six interchangeable tire and wheel assemblies are each mounted to the wheel spindle flanges. Ten lug nuts are used to
mount each wheel. Refer to WP 0002 00 for tire specifications.