2-26. AIR COMPRESSOR.
a. Component Parts. The air compressor (fig. 2-26) consists of a 2-stage, 200-pound per square inch, air cooled,
splash lubricated, belt driven compressor; a pressure gage; and a continuous service 1-horsepower, 60-Hz single phase,
110-220-volt alternating current motor. The compressor, gage, and motor are mounted on a common base, which in turn
is mounted on a receiver tank. The compressor is connected to the receiver tank, which is equipped with safety valve,
service valve, and draincock. The receiver tank is mounted on a metal base equipped with four casters. After the
compressor is positioned, the casters are raised by bolts and the base is bolted to the floor. The motor is connected to a
single phase, 110-volt starting switch, which provides protection to the motor against burning out because of the
momentary high starting current.
b. Operation. After the air compressor is positioned, electric and service lines connected, and power turned on, the
unit will operate automatically, maintaining the prescribed air pressure in the receiver tank.
Do not direct compressed air against the skin. Do not use compressed air for cleaning except
where reduced to less than 30 psi (2.11 kg/cm2) and then only with chip guarding and eye
(1) Before starting air compressor for first time, fill the crankcase with oil, lubricating engine crankcase, "OEA".
(2) Check motor bearings for lubrication, and check tension of belts.
(3) Turn compressor over a few revolutions by hand to make certain unit is in operating condition.
(4) Start compressor motor and note direction of arrow on belt wheel to make sure direction of rotation is
correct. Never put hands on the belts of an idle unit unless the main motor switch is off. Operate air compressor on a
closed circuit until proper pressure is built up in the air receiver tank.
c. Maintenance. After the first few days of operating the air compressor, tighten the cylinder-flange and cylinder-
head nuts to prevent their working loose and wrecking the compressor. Inspect the air compressor and motor once a
week to make certain they are in proper operating condition.
Change 1 2-46