Gun Operation Troubleshooting - Graco 224200 Instructions-Parts List Manual

Gun Operation Troubleshooting

Problem
Fluid leakage from the fluid packing
area
Air leakage from the front of the gun
Fluid leakage from the front of the gun The needle is worn or damaged.
"Orange Peel" finish
Excessive spray fog
No fluid sprays from the gun
The equipment is covered with fluid
The air cap is dirty
Troubleshooting
Cause
The needle packings or shaft are worn.
The air valve is not seating properly.
The air valve o-ring is sticking.
The fluid seat is worn.
The resistor stud is loose.
The fluid nozzle is loose.
The resistor stud o-ring is damaged.
The air pressure is insufficient for good
atomization.
The fluid is poorly mixed or filtered.
An improper thinner is being used.
The air pressure is too high.
The fluid is thinned too much.
The fluid supply is low.
The air cap is damaged.
The fluid nozzle is dirty or clogged.
The fluid nozzle is damaged.
The fluid adjustment valve is damaged.
The exhaust air flow is insufficient or not
directed properly.
The distance between the gun and work-
piece is incorrect.
The air cap and fluid nozzle are mis-
aligned.
Air Cap
Fluid Nozzle
ALIGNED MISALIGNED
Solution
Replace the packings or shaft; see page
26.
Clean and service the air valve; see page
30.
Lubricate the o-ring; see page 30.
Replace the needle; see page 26.
Replace the fluid nozzle and/or electrode
needle; see pages 22 to 23.
Tighten the resistor stud; see page 22.
Tighten the fluid nozzle; see page 22.
Replace the o-ring; see page 22.
Increase the air cap air pressure by open-
ing the atomizing air valve more or in-
creasing the gun air inlet pressure; use
the least air pressure needed for good
results.
Remix or refilter the fluid.
Use the proper thinner.
Reduce the air cap air pressure by closing
the atomizing air valve more or decreas-
ing the gun air inlet pressure; use the
least air pressure needed for good results.
Do not reduce below minimum pressure
needed for full voltage. See page 13.
Properly thin the fluid.
Check the fluid supply; add fluid if
necessary.
Replace the air cap; see page 22.
Clean the fluid nozzle; see page 15.
Replace the fluid nozzle; see page 22.
Replace the o-ring; see page 30.
Check for the proper CFM; check the
baffles and direction of the air flow.
Adjust the spraying distance to 8 to 12
inches (203 to 305 mm).
Check the air cap and fluid nozzle seat for
fluid buildup.
Clean or replace parts as needed; see
page 15 or 22.
308131 17