Craftsman 919.727350, Owner'S Manual

7 — ENG

D20418    Rev. 0    2/22/00

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 ex-
haust  valves remain closed. On the upstroke of the pis-
ton, 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.

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 pres-
sure 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 pres-
sure reaches the factory set “cut-out” pressure.

Pressure Release Valve: 

 The pressure release valve

located 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" pressure or the unit is shut off. If the air is not re-
leased, 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
motor reaches normal operating speed, the flow valve
closes and the pump begins to compress air, thus re-
quiring 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 “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.  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 clockwise to increase pressure and counter-clock-
wise to decrease pressure. To avoid minor readjustment
after making a change in pressure setting, always ap-
proach 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 ac-
cessory.

Regulator Gauge: 

 The outlet pressure gauge indicates

the air pressure available at the outlet side of the regula-
tor.  This pressure is controlled by the regulator and is
always less than or equal to the tank pressure. See “Op-
erating Procedures”.

Tank Pressure Gauge: 

The tank pressure gauge indi-

cates the reserve air pressure in the tank.

Cooling System:

  This compressor contains an ad-

vanced design cooling system. At the heart of this cool-
ing 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.

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. Un-
screw the drain valve and allow the water to drain.

DESCRIPTION OF OPERATION

TOOLS NEEDED FOR ASSEMBLY

• a 9/16" socket and an  open end wrench for attach-

ing the wheels

• a 3/8" open end wrench or socket to tighten handle

screws