Graco M04xxx, M34xxx, M18xxx, M02xxx, M12xxx, M07xxx Troubleshooting, Problem Cause Solution

Troubleshooting

Troubleshooting

Relieve the pressure before checking or servicing the equipment.

NOTICE

Check all possible problems and causes before dis- assembling the pump.

Problem	Cause	Solution
Air motor will not run.	DataTrak solenoid engaged (DataTrak	Push solenoid release button (118).
	models with runaway protection).	Remove solenoid and manually
		move pin.
	Damaged air valve (17).	Replace or service air valve (17).
		See page 9.
	Damaged pilot valve (19).	Replace pilot valves (19). See page
		13.
Air continuously exhausting	Damaged u-cups (3, 43).	Replace piston rod u-cups (3, 43).
around air motor piston rod.		See page 13.
Air continuously exhausting from	Damaged air valve plate (105) or cup	Replace or service air valve (17).
muffler.	(112).	See page 9.
Air motor “bounces” at top of	Damaged bottom pilot valve.	Replace bottom pilot valve (19). See
stroke.		page 13.
Air motor “bounces” at bottom of	Damaged top pilot valve.	Replace top pilot valve (19). See
stroke.		page 13.
Icing inside motor.	Air motor operating at high pressure	Reduce pressure, cycle rate, or duty
	or high cycle rate.	cycle of motor.
		Reduce dew point of compressed air
		in moisture coalescing filter.

8 312796R