Graco 334466A Troubleshooting, Mechanical/Fluid Flow, Refer to this column

Troubleshooting

Troubleshooting

Mechanical/Fluid Flow

1.Follow Pressure Relief Procedure, page 13, before checking or repairing.

2.Check all possible problems and causes before disassembling the unit.

	What to Check	What to Do
	If check is OK, go to next	When check is not OK,
Problem	check	refer to this column
For units with display:	Fault condition exists.	Determine fault correction from
E=0X is displayed.		Electrical, page 33.
For units with no display: Control
board status light is blinking or the
light is off and there is power to the
sprayer.
Pump output is low	Spray tip worn.	Follow Pressure Relief Procedure,
		page 13, then replace tip. See
		separate gun or tip manual.
	Spray tip clogged.	Relieve pressure. Check and clean
		spray tip.
	Paint supply.	Refill and reprime pump.
	Intake strainer clogged.	Remove and clean, then reinstall.
	Intake valve ball and piston ball are	Remove intake valve and clean.
	not seating properly.	Check balls and seats for nicks;
		replace if necessary. See pump
		manual. Strain paint before using to
		remove particles that could clog
		pump.
	Fluid filter or tip filter is clogged or	Clean filter.
	dirty.
	Prime valve leaking.	Follow Pressure Relief Procedure,
		page 13, then repair prime valve.
	Verify pump does not continue to	Service pump. See pump manual.
	stroke when gun trigger is released.
	(Prime valve not leaking.)
	Leaking around throat packing nut	Replace packings. See pump manual.
	which may indicate worn or damaged	Also check piston valve seat for
	packings.	hardened paint or nicks and replace if
		necessary. Tighten packing
		nut/wet-cup.

30 334466A