HP 288048 - Manual (Page 16)

Troubleshooting
16 311053C
Spray Pattern Troubleshooting
Problem Cause Solution
Fluttering spray. Insufficient fluid supply.
Air in paint supply line.
Adjust fluid regulator or fill fluid sup-
ply tank.
Check, tighten siphon hose connec-
tions, bleed air from paint line.
Spitting spray. Worn seat (10, 41) or needle (12)
ball.
Dirty spray tip (9).
Swollen piston o-ring (22).
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.
Irregular pattern. Fluid build-up or spray tip partially
plugged. Clean spray tip; see Daily Gun Care,
page 12.
Air cap loosening. (Sealant gun only) Air cap (18) not properly tightened.
Gasket (38) worn.
Tighten. See Reassembly, page 19,
step 13.
Replace gasket.