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Performing repairs may expose voltage sources, moving parts or compressed air sources,
moving parts or compressed air sources. Personal injury may occur. Prior to attempting any
repairs, unplug the air compressor and bleed off all air tank air pressure.
PROBLEM
Excessive tank pressure - safety
valve pops off.
Air leaks at fittings.
Air leaks at or inside check valve
Air leaks at pressure switch
release valve.
Air leaks in air tank or at air tank
welds.
Air leaks between head and valve
plate.
Knocking Noise.
D21879
TROUBLESHOOTING
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.
Check valve seat damaged.
Defective pressure switch release
valve.
Defective air tank.
Leaking seal.
Possible defect in safety valve.
Defective check valve.
16 - ENG
CORRECTION
Move On/Auto/Off lever to the
"OFF" position, if the outfit does
not shut off contact a Trained
Service Technician.
Contact a Trained Service
Technician.
Tighten fittings where air can be
heard escaping. Check fittings
with soapy water solution. DO
NOT OVERTIGHTEN.
A defective check valve results in
a constant air leak at the pressure
release valve when there is pres-
sure in the tank and the compres-
sor is shut off. Replace check
valve. Refer the "To Replace or
Clean Check Valve" in the
"Service and Adjustment" section.
Contact a Trained Service
Technician.
Air tank must be replaced. Do not
repair the leak.
Do not drill into, weld or otherwise
modify air tank or it will weaken.
The tank can rupture or explode.
Contact a Trained Service
Technician.
Operate safety valve manually by
pulling on ring. If valve still leaks,
it should be replaced.
Remove and clean, or replace.
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