Sears Craftsman 919.154320 - Manual (Page 6)

GENERAL iNFORMATION
You have purchased an air compressor unit consisting of
a 1 cylinder, single-stage air compressor pump, an air
tank, air hose, wheels, handle, and associated controls.
You will also find an air chuck.
This air compressor requires no oil. Now you can enjoy
all the benefits of having an air compressor without ever
having to purchase, add or change oil.
Your air compressor can be used for operating paint
spray guns, air tools, caulking guns, grease guns, air
brushes, sandblasters, or inflating tires and plastic toys,
spraying weed killers, insecticides, etc.
Separate air transformers which combine the functions
of air regulation and/or moisture and dirt removal should
be used where applicable.
DESCRIPTION OF OPERATION
PRESSURE SWITCH (not shown)
• TANK PRESSURE GAUGE
REGULATOR
AIR FILTER (not shown)
MOUNTING RING
REGULATED
PRESSURE GAUGE
AIR OUTLET
HANDLE GRIP
CONTROL COVEI
(rear cover is
not shown)
SAFETY VALVE
SCREW
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
valve remains closed. On the upstroke of the piston, air is
compressed. The intake valves close and compressed
air is forced out through the exhaust valve, through the
outlet tube, through the check valve and into the air tank.
Working air is not available until the compressor has
raised the air tank pressure above that required at the air
outlet.
Check Vaive: 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”
pressure, the check valve “closes”, allowing air pressure
to remain inside the air tank.
Pressure Release Valve: The pressure release valve
located on the side of the pressure switch, is designed to
automatically release compressed air from the com­
pressor head and the outlet tube when the air compres­
sor reaches “cut-out” pressure or is shut off. If the air is
not released, the motor will try to start, but will be unable
to. The pressure release valve allows the motor to restart
freely. When the motor stops running, air will be heard
escaping from the valve for a few seconds. No air should
be heard leaking when the motor is running.
Pressure Switch: The pressure switch automatically
starts the motor when the air tank pressure drops below
\
DRAIN COCK
the factory set “cut-in” pressure. It stops the motor when
the air tank pressure reaches the factory set “cut-out”
pressure.
Safety Valve: If the pressure switch does not shut off the
air compressor at its cut-out pressure setting, the safety
valve will protect against high pressure by “popping out”
at its pre-set pressure.
Regulator: The air pressure coming from the air tank is
controlled by the regulator knob. Turn the knob
clockwise to increase pressure and counter-clockwise
to decrease pressure. To avoid minor readjustment after
making 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 pressure less than that desired, then bring up to
the desired pressure. Depending on the air requirements
of each particular accessory, the outlet regulated air
pressure may have to be adjusted while operating the
accessory.
Outlet Pressure 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 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.