Troubleshooting Guide - Craftsman 919.727121 Owner's Manual

PERFORMING REPAIRS MAY EXPOSE VOLTAGE SOURCES, MOVING PARTS OR COMPRESSED
AIR SOURCES. PERSONAL INJURY MAY OCCUR. PRIOR TO ATTEMPTING ANY REPAIRS, UN-
PLUG 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
release valve.
Air leaks in air tank or at air tank
welds.
Air leaks between head and
valve plate.
Pressure reading on the
regulated pressure gauge
drops when an accessory is
used.
D20414 Rev. 0 2/15/00

TROUBLESHOOTING GUIDE

CAUSE
Pressure switch does not shut off
motor 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.
Leaking seal.
It is normal for "some" pressure
drop to occur.
12 — 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.
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.
ad screws to 8 ft. lbs. If this does not
Torque he
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 7.
NOTE
Adjust the regulated pressure under flow
conditions (while accessory is being used).