9.3.5 Replace piston seals.
Personnel:
Operator
+ additional qualification explosion pro-
tection
Protective equipment:
Protective workwear
Protective gloves
Disassembly
Fig. 24: Disassembling Piston
1. Unscrew and remove cap nut (8).
2. Pull off end cap (7).
3. Remove needle spring (5) and plunger
spring (6).
4. Pull back complete needle (4) out of the
housing.
5. Loosen hex nut (1).
6. Thread off and remove screw (2).
7. Pull out the complete piston axis (3).
For simpler disassembly, a M5
screw can be screwed into the
piston axis (3).
Fig. 25: Replace piston seals
8. Loosen locknut (9).
9. Pull out sealing body (10) from piston
axis (16).
10. Pull off stop bush (11).
11. Pull off ball bearing plate springs (12).
12. Loosen bracket nut (13).
13. Pull off counter-washer (14).
14. Pull off piston sleeve (15).
15. Replace seals of the stop bush (11),
sealing body (10) and piston sleeve
(15).
Worn out sealing rings, which
are inside of the stop bush,
need to be replaced by Dürr
Systems.
Assembly
16. Use a drop of oil to wet the piston axis
(16).
17. Push piston sleeve (15) and counter-
washer (14) on to the piston axis (16).
18. Insert and tighten bracket nut (13).
19. Push ball bearing plate springs (12) and
stop bush (11) on to the piston axis
(16).
20. Push sealing body (10) on to the piston
axis (16).
21. Insert and tighten locknut (9).
Faults
02/2020
EcoGun AA AUTO - MSG00008EN
26/48
