Craftsman 921.153120 - Manual (Page 5)

3
Parts & Features
See figures below for reference.
Pressure Relief Tube
Outlet Tube
Oil Sight Gauge
Oil Fill Cap
Pressure Switch
This controls the power to the motor and also the
cut-in/cut-out pressure settings. This switch serves
as the Auto-On/Off positions for the unit.
Regulator
The air pressure coming from the air tank is controlled
by the regulator. To increase the pressure turn the
knob clockwise and to decrease the pressure turn the
knob counterclockwise.
Regulator Gauge
Indicates the outgoing air pressure to the tool and is
controlled by the regulator.
Air Intake Filter
Provides clean air to the pump and must always be
kept free of debris. Check on a daily basis or before
each use.
Quick Connect
Offers a quick release feature for attaching and
removing the air hose.
Tank Drain Valve
Used to drain condensation from the air tank.
Located at bottom of tank.
Check Valve
When the pump is not in operation the valve closes
to retain air pressure inside the tank. An internal
component.
Tank Safety Valve
Used to allow excess tank pressure to escape into
the atmosphere. This valve should only open when
the tank pressure is above the maximum rated
pressure.
Pressure Relief Valve
The pressure relief valve located on the side
of the pressure switch, is designed to
automatically release compressed air when the
air compressor reaches cut-out pressure. The
released air should only escape momentarily
and the valve should then close.
Tank Pressure Gauge
Indicates the reserve air pressure
in the tank.