Troubleshooting Guide - Craftsman 919.152921 Owner's Manual

TROUBLESHOOTING GUIDE
PERFORMING REPAIRS MAY EXPOSE VOLTAGE SOURCES, MOVING PARTS OR COM=
PRESSED AiR SOURCES. PERSONAL iNJURY MAY OCCUR. PRIOR TO ATTEMPTING ANY
REPAIRS, UNPLUG THE COMPRESSOR AND BLEED OFF TANK AiR PRESSURE.
PROBLEM
Excessive tank pressure - safety
valve pops off.
Air leaks at fittings.
Air leaks at pressure switch re-
lease valve.
Air leaks in air tank or at air tank
welds.
CAUSE
Pressure switch does not shut off mo-
tor when compressor reaches "cut-
out" pressure.
Pressure switch "cut-out" too high.
Tube fittings are not tight enough.
Defective pressure switch release
valve.
Defective flapper valve in manifold.
Check valve seat damaged.
Defective air tank.
CORRECTION
Move the pressure switch lever to the "OFF" position.
If the unit doesn't shut off, and the electrical contacts
are welded together, replace the pressure switch.
Return the outfit to Sears Service Center to check
and adjust, or replace switch.
Tighten fittings where air can be heard escaping.
Check fittings with soapy water solution. DO NOT
OVERTIGHTEN.
Remove and replace the release valve.
Check to see if the pin in the bottom of the pressure
release valve is stuck. If it does not move freely,
replace the valve.
A defective flapper valve results in a constant air leak
at the pressure release valve when there is pressure
in the tank and the compressor is shut off. Remove
and clean or replace valve.
Inspect and replace upper manifold assembly.
Air tank must be replaced. Do not repair the leak.
DO NOT DRILL iNTO, WELD OR OTHER=
WiSE MODIFY AiR TANK OR iT WiLL
WEAKEN. THE TANK CAN RUPTURE OR
EXPLODE.
Air leaks between head and Leaking seal. Torque head screws to 8 ft. Ibs. If this does not stop
valve plate, leak, replace seal.
Pressure reading on the It is normal for "some" pressure drop
regulated pressure gauge to occur.
drops when an accessory is
used.
Ifthere is an excessive amount of pressure drop when
the accessory is used, adjust the regulator following
the instructions on page 6.
NOTE
Adjust the regulated pressure under flow condi-
tions (while accesory is being used).
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