Troubleshooting Guide - Craftsman 919.727570 Owner's Manual

PERFORMING REPAIRS MAY EXPOSE VOLTAGE SOURCES, MOVING PARTS OR COMPRESSED 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.
Air leaks between head and valve
plate.
Pressure reading on the regu-
lated pressure gauge drops
when an accessory is used.

TROUBLESHOOTING GUIDE

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 flapper valve in manifold.
Check valve seat damaged.
Defective air tank.
Leaking seal.
It is normal for "some" pressure drop to
occur.
11 — ENG
CORRECTION
Move the pressure switch lever to the "OFF" position.
If the outfit 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.
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.
Air tank must be replaced. Do not repair the leak.
Inspect and replace upper manifold assembly.
DO NOT DRILL INTO, WELD OR OTHERWISE
MODIFY AIR TANK OR IT WILL WEAKEN. THE
TANK CAN RUPTURE OR EXPLODE.
Torque head screws to 4 ft. lbs. If this does not
stop leak, replace seal.
If there 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 conditions
(while accessory is being used).
D20419 Rev. 0 2/22/00