Troubleshooting guide

8
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, outlet tube and check
valve into the air tank. Working air is not available
until the air 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 de-
signed to automatically release compressed air from
the compressor 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 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, or heard continuously leaking
after the unit reaches cut-out pressure.
Unloader Valve: All models are continuously run-
ning units controlled by tank pressure. When the
maximum tank pressure is obtained, the unloader
valve will exhaust the compressed air to the atmo-
sphere (blow-off). When the tank pressure drops to a
pre-determined point, the unloader valve closes and
causes the tank pressure to increase.
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 excessive high
pressure by “popping out” at its factory set pressure
(slightly higher than the pressure switch cut-out
setting).
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
pressure regulator and is always less than or equal to
the tank pressure.
Tank Pressure Gauge: The tank pressure gauge
indicates the air pressure in the air tank.
Pressure Regulator: The air pressure coming out of
the air tank for operating the air tools is controlled by
the pressure regulator knob. Turn the knob clockwise
to increase pressure and counterclockwise to de-
crease 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 the pressure up to the desired pressure. De-
pending on the air requirements of each particular
accessory, the outlet regulated air pressure may have
to be adjusted while you are operating the accessory.
Off/On-Auto
Pressure Switch
Oil Drain
Rubber
Feet
Drain
Valve
Handle
Safety
Valve
Outlet
Pressure
Gauge
Unloader
Valve
Check Valve
Tan k
Pressue
Gauge
Air Intake
Filter
Pressure
Regulator
Air Compressor
Pump
Belt Guard
Drive Belt
Electric Motor
Air Tank (2)
Wheel
Pressure
Equalizer
Tube
Oil Fill
DESCRIPTION OF OPERATION (cont'd)
Figure 1 — Electric Motor Powered Air Compressor Wheelbarrow Style