SOMAS A11 - Page 32

32
Edition: 2022-06 Original document - Mi-503 EN
Procedure
1. Disconnect internal air piping.
2. Unscrew the adjusting screw (
➔ Fig.5-3/15) to its outermost position.
3. Loosen the nuts (
➔ Fig.5-3/16), alternating crosswise.
Note
i
Do not unscrew the nuts completely. Make sure that the spring force is released. The end cover
has to be completely loose before removing the nuts and washers (
➔ Fig.5-3/17) completely.
Check with Somas if “tension” from the spring remains.
4. For actuator size A13-SC loosen the nuts (➔ Fig.5-3/1) in the same way.
5. Dismantle the end cover (
➔ Fig.5-3/3), cylinder tube (➔ Fig.5-3/4) and tie-rods (➔
Fig.5-3/22).
6. Unscrew the screw (
➔ Fig.5-3/5), dismantle the guide ring (➔ Fig.5-3/7), piston
disc (
➔ Fig.5-3/8) and spring kit (➔ Fig.5-3/18).
7. Unscrew the screws (
➔ Fig.5-3/19). Remove the front end cover (➔ Fig.5-3/20).
Replace the piston rod seal (
➔ Fig.5-3/9) and O-ring (➔ Fig.5-3/10). Refit the
front end cover.
8. Replace the O-ring (
➔ Fig.5-3/21) in the front end cover and the O-ring
(
➔ Fig.5-3/11) on the piston rod.
9. Refit the spring kit.
10. Fit a new piston seal (
➔ Fig.5-3/12) and O-ring (➔ Fig.5-3/13) on the piston disc.
Screw together the complete package on the piston rod and fit a new guide
ring (
➔ Fig.5-3/7).
11. Replace the O-ring (
➔ Fig.5-3/14) on the end cover.
12. Refit the cylinder tube, tie-rods and end cover.
13. Tighten the nuts (
➔ Fig.5-3/16), alternating crosswise. Do not exceed maximum
tightening torques for tightening (
➔ Tab.4-1).
An end position adjustment should be made if the device is fitted on a valve
(
➔ Chap.4).