12 — ENG
D20982 Rev. 0 5/3/00
Torque he
ad screws to 8 ft. lbs. If this does not
stop leak, replace seal.
CAUSE
CORRECTION
Excessive tank pressure -
safety valve pops off.
Pressure switch does not shut off
motor when compressor reaches
“cut-out” pressure.
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.
Tube fittings are not tight enough.
Tighten fittings where air can be heard escaping.
Check fittings with soapy water solution. DO NOT
OVERTIGHTEN.
PROBLEM
Air leaks at fittings.
Pressure switch “cut-out” too high.
Defective pressure switch release
valve.
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.
Air leaks at pressure switch
release valve.
TROUBLESHOOTING GUIDE
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.
Inspect and replace upper manifold assembly.
Check valve seat damaged.
Defective air tank.
Air leaks in air tank or at air tank
welds.
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
valve plate.
Leaking seal.
Pressure reading on the
regulated pressure gauge
drops when an accessory is
used.
It is normal for “some” pressure
drop to occur.
NOTE
Adjust the regulated pressure under flow
conditions (while accessory is being used).
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.
Defective flapper valve in manifold.
If there is an excessive amount of pressure drop
when the accessory is used, adjust the regulator
following the instructions on page 7.
