Description Of Operation - Craftsman 919.162121 Owner's Manual

DESCRIPTION OF OPERATION
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 compressed. 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.
Working air is not available until the compressor has raised
the air tank pressure above that required at the air outlet.
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"
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 compres-
sor head and the outlet tube when the air compressor
reaches "cut-out" pressure or is shut off. If the air is not
released, the motor will not be able to start. The pressure
release valve allows the motor to restart freely. When the
motor stops running, air will be heard escaping from the
valvefor afewseconds. Noairshould beleakingwhenthe
motor is running.
Pressure Switch: The pressure switch automatically
starts the motor when the air tank pressure drops below
the factoryset"cut-in" pressure. It stopsthe motor when
the air tank pressure reaches the factory set "cut-out"
pressure.
SafetyValve: If the pressure switch does not shut offthe
air compressor at its cut-out pressure setting, the safety
valve will protect the tank against high pressure by
"popping out" at its factory set pressure (slightly higher
than the pressure switch cut-out setting).
Regulator: The air pressure coming from the air tank is
controlled by the regulator. Turn the regulator knob clock-
wise to increase pressure and counter-clockwise to de-
crease 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 pres-
sure may have to be adjusted while operating the acces-
sory.
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.
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
expelled.
TOOLS NEEDED FOR ASSEMBLY
• a 9/16" socket or open end wrench for attaching the • a 3/8" open end wrench or socket to tighten handle
wheels screws