Graco 309063F important safety instructions Troubleshooting, Motor WON’T Operate

Troubleshooting

Relieve pressure; page 6.

MOTOR WON’T OPERATE

TYPE OF PROBLEM	WHAT TO CHECK		WHAT TO DO
	If check is OK, go to next check		When check is not OK refer to this column
Basic Fluid Pressure	1.	Pressure control knob setting. Motor will not run	1.	Slowly increase pressure setting to see if mo-
Problems		if at minimum setting (fully counterclockwise).		tor starts.
	2.	Spray tip or fluid filter may be clogged.	2.	Relieve pressure and clear clog or clean fil-
				ter; refer to separate gun or tip instruction
				manual.
Basic Mechanical	1.	Pump (13) frozen or hardened paint.	1.	Thaw sprayer if water or water-based paint
Problems				has frozen in sprayer. Place sprayer in warm
				area to thaw. Do not start sprayer until
				thawed completely. If paint hardened (dried)
				in sprayer, replace pump packings. See
				page 26 (Displacement Pump Replace-
				ment).
	2.	Displacement pump connecting rod pin (9a).	2.	Push pin into place and secure with spring re-
		Pin must be completely pushed into connecting		tainer.
		rod (9) and retaining spring (9b) must be firmly
		in groove of pump pin. See Fig. 18.
	3.	Motor (1). Remove drive housing assembly	3.	Replace motor (1) if fan won’t turn. See page
		(10). See page 24. Try to rotate fan by hand.		25.
Basic Electrical Problems	1.	Motor control board. Board shuts down and dis-	1.	See Motor Control Board Diagnostics,
See Wiring Diagram, pages		plays error code on some models.		page 19.
15 to 18.
	2.	Electrical supply. Meter must read 100--130	2.	Reset building circuit breaker; replace build-
		VAC for 110--120 VAC models and 210--255		ing fuses. Try another outlet.
		VAC for 240 VAC models.
	3.	Extension cord. Check extension cord continu-	3.	Replace extension cord.
		ity with volt meter.
	4.	Sprayer power supply cord. Inspect for damage	4.	Replace power supply cord.
		such as broken insulation or wires.

5.Fuse. Check replaceable fuse on control board. 5. Replace fuse after completing motor inspec- tion.

6. Motor leads are securely fastened and properly	6.	Replace loose terminals; crimp to leads. Be
connected to control board.		sure terminals are firmly connected.
		Clean circuit board terminals. Securely re-
		connect leads.
7. Motor thermal switch. Yellow motor leads must	7. Replace motor. See page 25, Motor Re-
have continuity through thermal switch.		placement.
8. Brush cap missing or loose brush lead connec-	8.	Install brush cap or replace brushes if leads
tions.		are damaged. See page 12, Motor Brush Re-
		placement.
9. Brush length which must be 1/4 in. (6 mm) mini-	9. Replace brushes. See page 12, Motor Brush
mum.		Replacement.
NOTE: Brushes do not wear at the same rate on
both sides of motor. Check both brushes.
10.Motor armature commutator for burn spots,	10. Remove motor and have motor shop resur-
gouges and extreme roughness.		face commutator if possible. See page 25,
		Motor Replacement.
11. Motor armature for shorts using armature tester	11. Replace motor. See page 25, Motor Re-
(growler) or perform spin test, page 12.		placement.
12.Pressure control not plugged in to control board.	12.Insert pressure control connector into control
		board.
		309063	9