1-12. PRINCIPLES OF OPERATION - Continued.
b. Gasoline Engine. The gasoline engine is a one cylinder, 4 cycle, air cooled power source that develops 10 HP at
3600 rpm. It transfers its power to the air compressor through a belt and pulley arrangement. The engine is equipped
with a manual recoil type starter.
. The unloader
is a valve that opens the compressor pump output pressure line
to free air and allow the
motor to start running. Once the motor has started, the valve is closed and compressed air is directed into the tank.