Samson 3372 - Replacing the Actuator Stem Seals

9-8 EB 8313-3 EN
Service and conversion work
5. Place the new diaphragm on the dia-
phragm plate (A5).
6. Place the compressor (A27) onto the ac-
tuator stem (A7).
7. Check the sealing element on the collar
nut (A15). If necessary, renew it.
8. Tighten the collar nut (A15). Observe
tightening torques.
9. Check whether the springs (A10) rest
correctly in the bottom diaphragm case
(A2).
10. Apply a suitable lubricant to the actuator
stem (A7).
11. Insert the actuator stem (A7) together
with the diaphragm plate (A5) and dia-
phragm (A4) into the bottom diaphragm
case (A2). Make sure that the radial
shaft seal (A40) is not damaged.
12. Place on the top diaphragm case (A1).
13. Fasten the top and bottom diaphragm
cases (A1, A2) together using the nuts
(A21) and bolts (A20). Observe tighten-
ing torques.
9.4.2 Replacing the actuator
stem seals
Before dismantling the actuator, mark both
diaphragm cases (A16, A2) to ensure that
the pneumatic connections are mounted cor-
rectly later on reassembling the actuator.
a) 120cm² version
Version with direction of action "actuator
stem extends"
1. Lift off the top diaphragm case (A16)
and remove springs (A10).
2. Pull the actuator stem (A3) together with
the diaphragm plate (A14), diaphragm
(A18) and diaphragm plate (A13) out of
the bottom diaphragm case (A2).
3. Use a suitable tool to remove the radial
shaft seal (A2.2) from the bottom case
(A2).
4. Check the dry bearing (A2.4) and wiper
(A2.3) and renew them, if necessary.
5. Apply a suitable lubricant to the seal lip
of the new radial shaft seal.
6. Use a suitable tool to mount the radial
shaft seal. Observe the correct alignment
of the radial shaft seal (see Fig.9-3).
7. Fill the cavity of the radial shaft seal, in
which the spring is seated, with lubri-
cant.
8. Apply a suitable lubricant to the actuator
stem (A3).
9. Place the actuator stem (A3) together
with the diaphragm plate (A14), dia-
phragm (A18) and diaphragm plate
(A13) in the bottom diaphragm case
(A2). Make sure that the radial shaft seal
(A2.2) is not damaged.
10. Place the springs (A10) into the bottom
diaphragm case, centering them in the
intended recesses.
11. Place on the top diaphragm case (A16).
Tip