Graco 395/490/495/595 important safety instructions Properly installed to allow full

Troubleshooting

	What to Check	What to Do
	If check is OK, go to next	When check is not OK,
Problem	check	refer to this column
Pump output is low	Pump rod damage.	Repair pump. See pump manual.
	Low stall pressure.	Turn pressure knob fully clockwise.
		Make sure pressure control knob is
		properly installed to allow full
		clockwise position. If problem
		persists, replace pressure transducer.
	Piston packings are worn or	Replace packings. See pump manual.
	damaged.
	O-ring in pump is worn or damaged.	Replace o-ring. See pump manual.
	Intake valve ball is packed with	Clean intake valve. See pump
	material.	manual.
	Large pressure drop in hose with	Reduce overall length of hose.
	heavy materials.
	Check extension cord for correct size.	See Extension Cords, page 12.
	Loose motor brushes and terminals.	Tighten terminal screws. Replace
		brushes if leads are damaged.
	Worn motor brushes. (Brushes must	Replace brushes.
	be 1/2 in. [13mm] minimum length.)
	Broken and misaligned motor brush	Replace spring if broken. Realign
	springs. Rolled portion of spring must	spring with brush.
	rest squarely on top of brush.
	Motor brushes are binding in brush	Clean brush holders, remove carbon
	holders.	dust with a small cleaning brush.
		Align brush lead with slot in brush
		holder to assure free vertical brush
		movement.
Motor runs but pump does not stroke	Connecting rod assembly damaged.	Replace connecting rod assembly.
	See pump manual.	See pump manual.
	Gears or drive housing damaged.	Inspect drive housing assembly and
		gears for damage and replace if
		necessary.
Excessive paint leakage into throat	Throat packing nut is loose.	Remove throat packing nut spacer.
packing nut		Tighten throat packing nut just
		enough to stop leakage.
	Throat packings are worn or	Replace packings. See pump manual.
	damaged.
	Displacement rod is worn or	Replace rod. See pump manual.
	damaged.

30 334530A