Graco 249377 Paint Sprayer User Manual


 
Troubleshooting
311051F 21
Fluid needle will not trigger. Loose or missing fluid needle stop
(29) or setscrew (30).
Air leaking around piston (3).
Swollen piston o-ring (8).
Insufficient air pressure on trigger.
Plug (19) is in incorrect fluid port.
Replace stop or tighten setscrew.
Replace o-ring (8) or piston.
Replace o-ring. Do not immerse pis-
ton in solvent.
Increase air pressure or clean air
line.
Move plug to fluid port consistent with
manifold plumbing, unless you are
using gun in a circulating system. If
you are, all fluid ports in gun and on
manifold should be open.
Fluid does not shut off. Worn o-ring (11) or (9).
Piston cap (4) not fully tightened.
Spring (6) not in place.
Swollen piston o-ring (8).
Replace o-ring.
Tighten piston cap until it bottoms
out.
Check spring position.
Replace o-ring. Do not immerse pis-
ton in solvent
Problem Cause Solution