DeVillbiss Air Power Company MGP-SL10120H-2A Troubleshooting Guide, Problem Cause Correction

TROUBLESHOOTING GUIDE

PERFORMING REPAIRS MAY EXPOSE VOLTAGE SOURCES, MOVING PARTS OR COMPRESSED AIR SOURCES. PERSONAL INJURY MAY OCCUR. PRIOR TO ATTEMPTING ANY REPAIRS, DISCONNECT POWER SOURCE FROM THE COMPRESSOR AND BLEED OFF ALL TANK AIR PRESSURE.

	PROBLEM	CAUSE	CORRECTION
Excessive tank pressure - safety		Pressure switch does not shut off mo-	Move the pressure switch lever to the "OFF" position.
valve pops off (units with ON-		tor when compressor reaches “cut-out"	If the outfit doesn’t shut off, and the electrical contacts
AUTO switch).		pressure.	are welded together, replace the pressure switch.
		Pressure switch "cut-out" too high.	Contact Service Center to check and adjust, or replace
			switch.
		Incorrect wiring connections.	See "Wiring of Compressor Units".
	Excessive tank pressure - safety	Pressure switch does not shut off mo-	Pressure switch must be replaced.
	valve pops off (units without	tor when compressor reaches "cut-out
	ON-AUTO switch).	pressure".
		Incorrect wiring connections.	See "Wiring of Compressor Units".
Air leaks at fittings or hose.		Tube fittings are not tight enough.	Tighten fittings where air can be heard escaping.
			Check fittings with soapy water solution. DO NOT
			OVER-TIGHTEN.
Air leaks at or inside check valve.		Defective or dirty check valve.	A defective check 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 check valve. DO NOT OVER-TIGHTEN.
Air leaks at pressure switch re-		Defective pressure switch release valve.	Remove and replace the release valve.
lease valve during running.
Continuous air relieving from		Defective check valve.	See "Air Leak at Check Valve."
pressure switch release valve
after shut off.
Air leaks in air tank or at air tank		Defective air tank.	Air tank must be replaced.
welds.
			DO NOT DRILL INTO, WELD, OR OTHERWISE
			MODIFY AIR TANK. IT WILL WEAKEN. THE
			TANK CAN RUPTURE OR EXPLODE.
Air leak from safety valves.		Possible defect in safety valves.	Operate safety valves manually by pulling on ring. If a
			valve still leaks, it should be replaced.
Squealing sound.		Loose belt.	Adjust belt tension. (See Belt Replacement.)
		There is no oil in the compressor.	Add oil. (See Oil-Checking and Changing)

MGP-SL10120H-2A 18—ENG