DeVillbiss Air Power Company MGP-SL10120H-2A, L10120H2-2 owner manual 117-207 ft.-lbs

TROUBLESHOOTING GUIDE

PROBLEM	CAUSE	CORRECTION
Compressor is not supplying	Loose belt.	Adjust belt tension.
enough air to operate accesso-	Hole in hose.	Check and replace if required.
ries. (Continued)
	Check valve restricted.	Remove and clean or replace.
	Air leaks.	Tighten fittings. (See "Air Leaks" section of "Trou-
		bleshooting Guide".)
Knocking noise.	Defective check valve.	Remove and clean or replace.
	Loose pulley.	Tighten pulley set screw, 145 to 165 in.-lbs.
	Low oil level.	Maintain prescribed oil level. Add oil.
	Loose flywheel.	Tighten screw, 33 to 37 ft.-lbs.
	Loose compressor mounting screws.	Check screws. Tighten as required.
	Belt too tight/too loose.	Adjust belt tension. (See Belt Replacement.)
	Carbon build-up.	Remove the head. Clean the valves and the top of the
		piston. (Be sure carbon does not fall into the cylinder.)
		Reassemble using new gaskets and torque screws,
		117-207 ft.-lbs.
Excessive oil consumption.	Restricted air intake.	Replace the air intake.
	Compressor overworked.	Reduce air consumption or add another air compres-
		sor to take up some of the load.
	Poor quality oil.	Drain pump and replace with correct oil. Refer to
		Lubrication and Oil Section.
Compressor overheating.	The compressor is overworked.	Reduce air consumption or add another air compres-
		sor to take up some of the load.
	The check valve is restricted.	Inspect the check valve. Clean if necessary.
	Dirty compressor.	Clean the compressor thoroughly.
	High ambient temperature.	Use remote air intake.
Motor overheating.	Incorrect oil, low oil.	See oil recommendation under Maintenance.
	Compressor starting against load.	Dirty or defective check valve.
	Low voltage.	Provide correct voltage. Consult local power com-
		pany or electrician.
	Pressure switch set beyond factory set-	Do not set switch beyond maximum for which outfit
	ting.	was designed as noted on nameplate.
	Belt too tight.	Adjust for proper tension.
	Compressor valves have excessive car-	Clean or replace compressor valves or check valve.
	bon deposits build-up; restricted check
	valve.

MGP-SL10120H-2A 20—ENG