DÖRR EcoGun AA AUTO, Operation Manual

Page: 21 / 48

Fault description Cause Remedy
Air escapes at the
leakage bore. O-rings of the piston are
worn out. Replace O-rings Ä 9.3.5 “Replace
piston seals.”.
Sealing rings are worn
out.
Have the sealing rings replaced by
Dürr Systems.
Air escapes between
piston axis and housing. Lip seal is worn out.
Have the lip seals replaced by Dürr
Systems.
Or replace lip seal with assembly / dis-
assembly tool for lip seal ( Ä 12.2
“Tools”).
Spray jet distinctly
smaller than original
(about 25%). Nozzle is worn out. Replace nozzle Ä 9.3.1 “Replace
nozzle”.
Spray jet is distorted. Air cap is misaligned.
Rotate air cap into the required posi-
tion Ä 4.3 “Setting the spray jet”.
Spray jet is uneven. Nozzle soiled or defec-
tive.
Clean and check the nozzle. Replace
nozzle if defective Ä 9.3.1 “Replace
nozzle”.
Material pressure is too
low. Increase material pressure.
Feed line is pinched or
broken. Check infeed line.
Needle does not close
correctly.
Check Control air.
Check operation of needle. Replace
needle, if defective, together with
the seal retainer screw Ä 9.3.2
“Replace needle and seals.”.
Cap nut is not correctly
tightened. Tighten cap nut Ä 7.2 “Cleaning”.
Formation of large
drops Delay time is too short. Set delay time Ä 9.3.4 “Set delay
time”.
Spraying nozzle is
blocked. Material pigmented is too
large for the selected
nozzle diameter.
Select material with smaller pig-
mentation.
Insert nozzle with a larger diameter
Ä 9.3.1 “Replace nozzle”.
Mesh values of the
external filter is too large. Insert filters with smaller mesh width.
Faults
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