17
MG6-OLVERT-3B Rev. 0 12/30/99
CAUSE
.
Move the pressure switch lever to the "OFF"
position. If the outfit doesn’t shut off. If the
electrical contacts are welded together, re-
place the pressure switch.
Contact a Service Center to check and adjust,
or replace switch.
Pressure switch must be replaced.
Tighten fittings where air can be heard escap-
ing. Check fittings with soapy water solution.
DO NOT OVER-TIGHTEN.
A defective check valve results in a constant
air leak at the pressure release valve when
there is pressure in the tank and the compres-
sor is shut off. Remove and clean or replace
check valve. DO NOT OVER-TIGHTEN.
Remove and replace the release valve.
Replace check valve.
Air tank must be replaced.
Operate safety valves manually by pulling on
ring. If a valve still leaks, it should be replaced.
Adjust belt tension. (See Belt Replacement.)
Add oil.
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 ALL TANK AIR PRESSURE.
PROBLEM
Excessive tank pressure - safety
valve pops off (units with ON-
AUTO switch).
Excessive tank pressure - safety
valve pops off (units without ON-
AUTO switch).
Air leaks at fittings or hose.
Air leaks at or inside check valve.
Air leaks at pressure switch re-
lease valve during running.
Continuous air relieving from
pressure switch release valve
after shut off.
Air leaks in air tank or at air tank
welds.
Air leak from safety valves.
Squealing sound.
Pressure switch does not shut off motor
when compressor reaches “cut-out” pres-
sure.
Pressure switch “cut-out” too high.
Pressure switch does not shut off motor
when compressor reaches "cut-out pres-
sure".
Tube fittings are not tight enough.
Defective or dirty check valve.
Defective pressure switch release valve.
Defective check valve.
Defective air tank.
Possible defect in safety valves.
Loose belt.
There is no oil in the compressor.
DO NOT DRILL INTO, WELD, OR
OTHERWISE MODIFY AIR TANK.
IT WILL WEAKEN. THE TANK CAN
RUPTURE OR EXPLODE.
CORRECTION
TROUBLESHOOTING GUIDE
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