Description Of Operation; Tools Needed For Assembly - Craftsman 919.727340 Owner's Manual

Air Compressor Pump: To compress air, the piston moves
up and down in the cylinder. On the downstroke, air is
drawn in through the air intake valves. The exhaust valves
remain closed. On the upstroke of the piston, air is com-
pressed. The intake valves close and compressed air is
forced out through the exhaust valves, through the outlet
tube, through the check valve and into the air tank.
Check Valve: When the air compressor is operating, the
check valve is "open", allowing compressed air to enter the
air tank. When the air compressor reaches "cut-out" pres-
sure, the check valve "closes", allowing air pressure to
remain inside the air tank.
Pressure Switch: The pressure switch is fitted with a
small lever. It is labeled "Auto/O" for automatic run or off.
In the "O" position, the motor will not run. In the "Auto"
position, it automatically starts the motor when the air tank
pressure drops below the factory set "cut-in" pressure. It
stops the motor when the air tank pressure reaches the
factory set "cut-out" pressure.
Pressure Release Valve: The pressure release valve lo-
cated on the side of the pressure switch is designed to
automatically release compressed air trapped within the
compressor head and outlet tube. This short release of air
will occur when the air compressor reaches "cut-out" pres-
sure or the unit is shut off. If the air is not released, the
motor will not be able to start when next required.
Flow Valve: The flow valve allows air to flow from the
head as the motor is getting "up to speed". Once the mo-
tor reaches normal operating speed, the flow valve closes
and the pump begins to compress air, thus requiring less
amp draw on initial start.
Safety Valve: If the pressure switch does not shut off the
air compressor at its cut-out pressure setting, the safety
valve will protect the tank against high pressure by "pop-
ping out" at its factory set pressure (slightly higher than
the pressure switch cut-out setting).
• a 9/16" socket and an open end wrench for attaching
the wheels

DESCRIPTION OF OPERATION

TOOLS NEEDED FOR ASSEMBLY

Regulator: The air pressure coming FROM the air tank is
controlled by the regulator. The regulator control knob is a
vibration proof design. Lift the regulator knob to engage
and depress the knob to lock. Turn the regulator knob clock-
wise to increase pressure and counter-clockwise to de-
crease pressure. To avoid minor readjustment after mak-
ing a change in pressure setting, always approach the
desired pressure from a lower pressure. When reducing
from a higher to a lower setting, first reduce to some pres-
sure less than that desired, then bring up to the desired
pressure. Depending on the air requirements of each par-
ticular accessory, the outlet regulated air pressure may
have to be adjusted while operating the accessory.
Regulator Gauge: The outlet pressure gauge indicates
the air pressure available at the outlet side of the regulator.
This pressure is controlled by the regulator and is always
less than or equal to the tank pressure. See "Operating
Procedures".
Tank Pressure Gauge: The tank pressure gauge indi-
cates the reserve air pressure in the tank.
Cooling System: This compressor contains an advanced
design cooling system. At the heart of this cooling system
is an engineered fan. It is perfectly normal for this fan to
blow air through the vent holes in large amounts. You know
that the cooling system is working when air is being ex-
pelled.
Drain Valve: This valve is located at the bottom of the
tank. To drain accumulated moisture from the tank, pull on
the safety valve until tank pressure is 15 PSI. Unscrew the
drain valve and allow the water to drain.
• a 3/8" open end wrench or socket to tighten handle
screws
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