HP 288048 User Manual

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.