Graco Inc. 233670 - Manual (Page 12)

12 308813
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.
NOTE:
D Check all possible remedies in the troubleshooting
charts before disassembling the gun.
D Some improper patterns are caused by the
improper balance between air and fluid. Refer to
Spray Pattern Troubleshooting, on page 13.
General Troubleshooting
Problem Cause Solution
Fluid leakage through venting
holes. Worn o-rings (31) or needle assembly
(12). Replace o-rings or needle assembly.
Air leakage through venting hole. Worn o-ring (23). Check and replace as needed.
Air leakage from back of gun. Worn o-rings (22, 23). Replace o-rings.
Fluid leakage from front of gun. Fluid needle (12) is dirty, worn, or
damaged. Clean or replace fluid needle.
Dirty or worn seat (10).
Spray tip seal is leaking.
Seat (10) is insufficiently tightened or
gasket (11) is missing or worn from
multiple uses.
Clean or replace the seat (10) and
gasket (11). The gasket must be
replaced whenever you remove the
seat from the gun.
Tighten nut (7) or replace spray tip
gasket (8).
Tighten seat (10) and replace gasket
(11). The gasket must be replaced
whenever you remove the seat from
the gun.
Fluid needle will not trigger. Loose or missing fluid needle stop
(17) or setscrew (16).
Broken fluid needle (12).
Replace stop (17) or tighten setscrew
(16).
Replace fluid needle (12).
Air leaking around piston (21).
Swollen piston o-ring (22).
Insufficient air pressure on the trigger.
Spray tip (9) is plugged.
Internal fluid filter (32) is plugged.
Plug (4) is in the incorrect fluid port.
Replace o-ring (22) or piston assem-
bly (21).
Replace o-ring (22). Do not immerse
piston in solvent.
Increase the air pressure or clean the
air line.
Clean the spray tip (9).
Clean or replace the filter (32).
Move the plug to the fluid port consis-
tent with manifold plumbing, unless
you are using the gun in a circulating
system. If you are, all fluid ports
should be open, both inside the gun
and on the manifold.
General Troubleshooting is continued on page 13.