DÖRR EcoGun AS AUTO pro HD, Operation Manual

Page: 20 / 44

Fault description Cause Correction
Nozzle soiled or defective Clean and check the nozzle. If nozzle
is defective, replace it along with the
needle Ä 9.3.1 “Replace needle and
nozzle.”.
Air leaks from the mate-
rial flow control
Piston sleeve worn out Replace piston sleeve
Ä
9.3.4
“Replace piston seals.”.
Air leak from the
leakage bore
O-rings of the piston worn
out
Replace O-rings Ä 9.3.4 “Replace
piston seals.”.
Sealing rings worn out Have the sealing rings replaced by
Dürr Systems.
Air leak between piston
axis and housing
Lip seal worn out Have the lip seal replaced by Dürr
Systems.
Or replace lip seal with assembly /
disassembly tool for lip seal ( Ä 12.2
“Tools”).
Uneven spray jet Nozzle soiled or defective Clean and check the nozzle. If nozzle
is defective, replace it along with the
needle Ä 9.3.1 “Replace needle and
nozzle.”.
Material pressure too low. Increase material pressure.
Infeed line pinched or
broken
Check infeed line.
Needle does not open. Check Control air.
Check operation of needle. Replace
needle, if defective, together with the
nozzle Ä 9.3.1 “Replace needle and
nozzle.”.
Cap nut or nozzle is not
properly tightened
Tighten cap nut and nozzle Ä 7
“Cleaning”.
Needle seal worn out Replace needle seal Ä 9.3.2 “Replace
needle seal”.
Formation of large drops Delay time too short Set delay time Ä 9.3.3 “Set delay
time”.
Faults
02/2020 EcoGun AS AUTO pro HD - MSG00009EN 20/44