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WARNING
INJECTION HAZARD
To reduce the risk of a fluid injection
injury, follow the Pressure Relief Proce-
dure on page 7 before checking or
servicing any of the system equipment and when-
ever you are instructed to relieve pressure.
General Troubleshooting
Problem
Fluid leakage from back of fluid
needle
Air leakage from front of gun
Fluid leakage from front of gun
Fluid in air passages
Fluid in air passages
Slow fluid shut-off
Spray Pattern Troubleshooting
Problem
Fluttering or spitting spray
Irregular pattern
Pattern pushed to one side, same
side of air cap gets dirty
Troubleshooting
NOTE:
Cause
Worn packings or needle shaft
Air valve not seating properly
Fluid needle worn or damaged
Worn diffuser-seat housing
Fluid tip seal leaking
Leaking around diffuser-seat housing
Fluid inlet fitting leaking
Fluid buildup on fluid needle cartridge
components.
Cause
Insufficient fluid supply
Air in paint supply line
Attempting to "feather" (partially trig-
ger) the gun.
Fluid build-up or spray tip partially
plugged
On defective side of pattern, air horn
holes are partially or totally plugged
Air horn holes partially or totally
plugged
Check all possible remedies in the troubleshooting
charts before disassembling the gun.
Some improper patterns are caused by the
improper balance between air and fluid.
Solution
Replace external needle packings or
entire fluid needle cartridge. See
page 14.
Clean/service air valve. See page 14.
Replace fluid needle cartridge. See
page 14.
Replace the diffuser-seat and gasket.
The gasket must be replaced when-
ever the diffuser-seat is removed.
See page 14.
Tighten or replace fluid tip.
Replace the diffuser-seat gasket. The
gasket must be replaced whenever
the diffuser-seat is removed. See
page 14.
Replace the fluid fitting gasket. The
gasket must be replaced whenever
the fluid fitting is removed. See
page 15.
Remove and clean or replace the
fluid needle cartridge. See page 14.
Solution
Adjust fluid regulator or fill fluid supply
tank.
Check, tighten siphon hose connec-
tions, bleed air from paint line.
Cannot "feather" with an AA gun.
Feathering will cause drastic reduc-
tion of pressure at the tip, resulting in
poor atomization and/or spitting.
Clean spray tip. See page 11.
Clean air horn holes with solvent and
soft brush. See page 11.
Clean air horn holes with solvent and
soft brush. See page 11.
308–640
13
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