Porter-Cable CLFRP350 Instruction Manual page 13

Dipstick: Indicates the amount of oil in the pump, the +
mark indicates full and the - mark indicates oil needs to
be added. See Oil paragraphs in the Maintenance section
for instructions.
Motor Thermal Overload Protector (not shown): The
motor has an automatic reset thermal overload protector.
If the motor overheats for any reason, the overload
protector will shut off the motor. The motor must be
allowed to cool down before restarting. The compressor
will automatically restart after the motor cools.
Air Intake Filter: This filter is designed to clean air
coming into the pump. This filter must always be clean
and ventilation openings free from obstructions. See
"Maintenance".
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
compressor head and the outlet tube when the air
compressor reaches "cut-out" pressure or is shut off.
The pressure release valve allows the motor to restart
freely. When the motor stops running, air will be heard
escaping from this valve for a few seconds. No air
should be heard leaking when the motor is running,
or continuous leaking after unit reaches "cut-out"
pressure.
13- ENG
A10055