Use and Care Guide

16
The compressor is making knocking
sounds.
There is a loose pulley.
There is a loose flywheel.
The compressor mounting screws are
loose.
The belt is too loose.
An excessive amount of carbon has built-
up in the pump.
The belt is too tight.
Tighten the pulley set screws.
Tighten the flywheel screw.
Tighten the mounting screws.
Check the belt tension.
Bring the compressor to a service center.
Check the belt tension.
ENGLISH
PROBLEM CAUSE CORRECTION
There is excessive belt wear. The belt is too loose.
The belt is too tight.
The pulley is loose.
The pulley is misaligned.
Check the belt tension.
Check the belt tension.
Align the pulley/flywheel. Correct the belt tension. Torque
the set screws.
Align the pulley/flywheel.
Tank is slow to build pressure or will not
build pressure
The connections (fittings, tubing, etc.) are
loose and leaking.
The drain valve is loose or open.
The check valve is leaking.
Check all the connections with a soap and water solution
and tighten.
Tighten the drain valve.
Bring the compressor to a service center.
There is excessive moisture in the discharge
air.
There is excessive water in the air tank.
The oil blow-by has accumulated in
the pump.
It is normal for oil lube air compressor pumps to release
some oil into the tank and air lines. Air compressors will also
generate water condensation that will form in the tank and
air lines. Install water and oil filter traps when needed. The
Typical Compressed Air Distribution System section provides
a guideline. Contact or call Craftsman Customer Service for more
information.
IMPORTANT: If the tank or air lines have excessive water and/or
oil, bring the compressor to a service center.
The fuses blow or the circuit breaker trips
repeatedly.
The incorrect fuse size is being used
, or
the circuit is overloading.
There are loose electrical connections.
There is a defective check valve or
unloader.
Verify the proper fuse size is being used.
Use time-delay fuses.
Disconnect other electrical appliances from the circuit or
operate the compressor on its own branch circuit.
Verify the wiring connection inside the pressure switch and the
terminal box area.
Bring the compressor to a service center.
Clean or replace check valve
Excessive tank pressure - safety valve
pops off.
Pressure switch does not shut off
motor when compressor reaches "cut-
out" pressure.
Move On/Off lever to the "Off" position, if the outfit does not
shut off contact a Trained Service Technician.
Pressure switch "cut-out" too high. Contact a Trained Service Technician.
Air leaks at fittings. Tube fittings are not tight enough. Tighten fittings where air can be heard escaping. Check fittings with
soapy water solution. Do Not Overtighten.
Air leaks in air tank or at air
tank welds.
Defective air tank. Air tank must be replaced. Do not repair the leak.
WARNING: Risk bursting. Do not drill into, weld or
otherwise modify air tank or it will weaken. The tank
can rupture or explode.