Graco Inc 290, 313797C Inspect Drive Housing Assembly and gears, Intermittently

Basic Troubleshooting / 基本故障排除 / 기본적인 문제 해결

Problem		What To Check	What To Do
		(If check is OK, go to next check)	(When check is not OK, refer to this column)
Motor runs and pump strokes	1.	Prime Valve is open or leaking.	Close or replace Prime Valve, page 60.
	2.	Paint supply.	Refill and reprime pump.
	3.	Intake strainer clogged.	Remove and clean, then reinstall.
	4.	Suction tube leaking air.	Tighten nut. Check o-rings on swivel tube.
	5.	Intake valve ball and outlet	Clean and repair pump, page 58. Strain paint before
		ball are seating properly not worn.	using to remove particles that could clog pump.
	6.	Leaking around throat packing	Replace Pump and Packing module, page 60.
		nut which may indicate worn
		or damaged packings.
	7.	Pump rod damaged.	Replace Pump and Packing module, page 60.
Motor runs but pump does not	8.	Gears or drive housing.	Inspect Drive Housing Assembly and gears
stroke			for damage and replace if necessary, page 60.
Motor is hot and runs	1.	Be sure ambient temperature where	Move sprayer to shaded, cooler area if possible.
intermittently		sprayer is located is not more
		than 115°F (46°C) and sprayer
		is not located in direct sun.
	2.	Motor has burned windings	Replace Motor, page 33.
		indicated by removing positive
		(red) brush and seeing burned
		adjacent commutator bars.
Low air output at gun	1.	Air valves at gun may be closed.	Turn air adjustment valve counter-clockwise to open.
			Slide air ON/OFF up to open.
	2.	Air connections may be loose.	Check all connections for leaking air.
Low air output at gun	3.	Damaged (leaking) air supply	Replace air supply hose.
		hose.
	4.	Air intake filter clogged.	Clean or replace air intake filter.

38 313797C