Spray Pattern Troubleshooting - Graco 288048 Instructions - Parts Manual

Troubleshooting

Spray Pattern Troubleshooting

Problem
Fluttering spray.
Spitting spray.
Irregular pattern.
Air cap loosening. (Sealant gun only) Air cap (18) not properly tightened.
16
Cause
Insufficient fluid supply.
Air in paint supply line.
Worn seat (10, 41) or needle (12)
ball.
Dirty spray tip (9).
Swollen piston o-ring (22).
Fluid build-up or spray tip partially
plugged.
Gasket (38) worn.
Solution
Adjust fluid regulator or fill fluid sup-
ply tank.
Check, tighten siphon hose connec-
tions, bleed air from paint line.
Inspect seat and needle for wear.
Replace if necessary. The gasket
(11) must be replaced whenever you
remove the seat from the gun.
Clean.
Replace o-ring. Do not immerse pis-
ton in solvent.
Clean spray tip; see Daily Gun Care,
page 12.
Tighten. See Reassembly, page 19,
step 13.
Replace gasket.
311053E