Graco Inc. 233670 - Manual (Page 13)

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Troubleshooting
WARNING
INJECTION HAZARD
To reduce the risk of an injection injury,
follow the Pressure Relief Procedure
on page 9 before checking or servicing
any of the system equipment and whenever you
are instructed to relieve pressure.
General Troubleshooting (continued)
Problem Cause Solution
Fluid does not shut off. Piston cap (18) is not fully tightened.
Spring (19) is not in place.
Swollen piston o-ring (22).
Tighten piston cap until it bottoms
out.
Check that spring is in position.
Replace o-ring (22). Do not immerse
piston in solvent.
Spray Pattern Troubleshooting
Problem Cause Solution
Fluttering spray Insufficient fluid supply
Air in paint supply line
Adjust fluid regulator or fill fluid supply
tank.
Check, tighten siphon hose connec-
tions, bleed air from paint line.
Spitting spray Worn seat (10) 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 re-
move 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 page 10.