Graco Inc. UNICARB Pro AA4500 - Manual (Page 22)

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Spray Pattern Troubleshooting
WARNING
Installing and servicing this equipment requires access to parts which may cause electric shock or other serious
injury if the work is not performed properly. Do not install or service this equipment unless you are trained and
qualified.
To reduce the risk of serious injury, including fluid injection, splashing fluid or solvent in the eyes or on the skin,
or electric shock, always follow the Pressure Relief Procedure on page 10 before checking, adjusting, clean-
ing or repairing the gun or any part of the system.
NOTE: Check all possible remedies in the Troubleshooting Charts before disassembling the gun.
NOTE: Some spray pattern problems are caused by the improper balance between air and fluid.
PROBLEM:
IMPROPER SPRAY
PATTERN CAUSE SOLUTION
Fluttering or spitting spray The fluid pressure or fluid supply is insuf-
ficient.
There is air in the fluid supply line.
The CO 2 percentage is fluctuating or is
too high.
The fluid temperature is fluctuating.
Adjust the flluid/CO 2 supply system.
Check; tighten the siphon hose connections;
bleed the air from the fluid line.
Check fluid/CO 2 supply system.
Check temperature control system
Irregular pattern There is fluid buildup on the spray tip or
the spray tip or pre-orifice is partially
plugged.
The spray tip or pre-orifice is damaged or
worn.
Clean the spray tip and pre-orifice; see
page 20.
Replace the damaged or worn part; see
page 29.
Tails in pattern The CO 2 percentage is too low.
The fluid pressure is too low.
The temperature is too low
Increase the CO 2 percentage.
Increase the fluid pressure with the gun fluid
regulator.*
Increase fluid temperature.
Excessive paint buildup on the
air cap and tip guard The fluid pressure is too low. Increase the fluid pressure with the gun fluid
regulator.*
* Use the least fluid pressure needed for good results.