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Servicing
phragm (911) and diaphragm holder
(902) into the top position.
4. Remove the retaining ring (918) and
then the bushing (903) including the
O-rings (924, 925).
5. Pull the diaphragm plate assembly con-
sisting of the diaphragm plate assembly
out of the bottom diaphragm case (900).
6. Firmly clamp the actuator stem (61) in
the area above the thread for the spring
adjuster into a vise using protective jaws.
Make sure that the actuator stem is not
damaged.
7. Unscrew the two screws (915) opposite
each other on the bottom diaphragm
case (900) and replace them with longer
screws, which stick out of the actuator
housing (40) by approx. 50 mm.
8. Unscrew the remaining short screws
(915).
9. Gradually unthread the two longer
screws that you have just inserted in a
crisscross pattern to safely relieve any
possible compression of the spring (595).
10. Lift off the bottom diaphragm case (850)
from the housing (40).
11. Remove seal (926) and yoke flange
(905) from the housing (40).
12. Renew the seal (926).
13. Replace the seals on the screws (915).
Apply silicone to the screws and insert
them into the bottom diaphragm case
(900) and housing (40). Tighten the
screws (915) in a crisscross pattern. Ob-
serve tightening torques.
8-6
14. Unscrew the screw (914) from the actua-
tor stem (61).
15. Take the diaphragm plate (901), dia-
phragm (911) and diaphragm holder
(902) (removing the silicone) off the actu-
ator stem (61).
16. Clean all parts that have been removed.
17. Insert the actuator stem (61) into the bot-
tom diaphragm case (900).
18. Renew O-rings (924, 925).
19. Mount the bushing (903) including the
new O-rings (924, 925) and the retain-
ing ring (918).
20. Place the parts on the actuator stem in
the specified order:
− Diaphragm holder (902) with silicone
− Diaphragm (911)
− Diaphragm plate (901)
21. Apply silicone to screw (914) and insert
it.
22. Use the screw (914) to fasten the parts
onto the actuator stem (61). Observe
tightening torque.
23. Apply a suitable lubricant to the thread
of the actuator stem (61).
24. Thread the spring adjuster (906) onto the
actuator stem (61) and into the actuator
housing (40) to the point at which it rests
on the spring plate (904).
Note
The spring adjuster (906) takes on a dual
function:
− It guides the spring (595) and actuator
stem (61) in the actuator housing (40).
EB 8318 EN
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