DeVilbiss GFG PRO Technical Bulletin page 15

Troubleshooting Possible Problems in Operation (cont)
Starved spray pattern
Excessive overspray
Dry spray
Fluid leaking from
packing nut
Fluid leaking or dripping
from front of gun
Fluid dripping or leaking
from bottom of cup
Runs and sags
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Inadequate material flow
Blocked vent in Cup lid
Low atomisation air pressure
Air pressure too high.
Gun too far from work surface.
Air pressure too high.
Gun too far from work surface.
Gun motion too fast.
Fluid flow too low.
Packing worn.
Fluid nozzle or fluid needle worn or
damaged.
Foreign matter in fluid nozzle.
Fluid needle dirty or stuck in needle
packing
Wrong size fluid needle or fluid nozzle.
Cup loose on gun.
Cup fluid inlet seat dirty.
Too much material flow.
Material too thin.
Gun tilted on an angle, or gun motion
too slow.
15
Wind fluid adjusting knob out or
change to larger fluid nozzle size
Clean lid and unblock vent
Increase air pressure and rebalance
gun.
Reduce air pressure.
Adjust to correct distance.
Reduce air pressure.
Adjust to correct distance.
Slow down.
Wind out needle adjusting screw or
use larger nozzle size.
Replace.
Replace fluid nozzle and fluid needle.
Clean.
Clean
Replace fluid nozzle and fluid needle.
Tighten
Clean.
Turn fluid adjusting knob clockwise
or switch to smaller fluid nozzle and
fluid needle size.
Mix correctly or apply light coats.
Hold gun at right angle to work and
adapt to correct gun technique.