DÖRR EcoGun AA AUTO, Operation Manual

Page: 20 / 48

9.2 Defects table
Visualizer of typical spray pattern problems
Spray pattern Fault identification
Spray jet is distorted.
Spray jet distinctly smaller than original (about
25%).
Spray jet is uneven.
Fault description Cause Remedy
No material Feed line pinched or
broken.
Check the line.
Needle does not open. Check Control air.
Material escapes with
the needle closed. Needle does not close
correctly.
Check control air venting.
Check operation of needle. Replace
needle, if defective, together with
the seal retainer screw Ä 9.3.2
“Replace needle and seals.”.
Needle spring and
plunger spring are worn
out.
Replace needle spring and plunger
spring Ä 9.3.3 “Replace needle spring
and plunger spring.”.
Seal retainer screw, seal
washer or needle is worn
out. Replace seal retainer screw, seal
washer and needle Ä 9.3.2 “Replace
needle and seals.”.
Material escapes at the
needle seal. Needle seal is worn out.
Replace needle seal
Ä
9.3.2 “Replace
needle and seals.”.
Needle gland is loose.
Tighten needle gland sensitively.
Air escapes at the end
cap. Piston sleeve is worn out.
Replace piston sleeve Ä 9.3.5
“Replace piston seals.”.
Faults
02/2020 EcoGun AA AUTO - MSG00008EN 20/48