11 Disassembly / assembly of the actuator
ARCA Regler GmbH
28 / 32
Series 812-DWK
03.2020 / 1.0
▪ Loosen the screws (21)
▪ Remove the top cover (118)
▪ Remove the intermediate ring (76)
▪ Replace the sealing ring (79), guide band (78) and O-rings (69)
▪ Remove the piston (77) with the stem (1)
"DWÖK" function
▪ Remove any positioner if fitted
▪ Dismount 4 hex nuts (23) and bolts (21)
evenly
at the periphery.
▪ Mount assembly/disassembly bolts (21) in grade 8.8 and new hex
nuts (23) in grade 8.8.
–
NOTICE!
The assembly/disassembly bolts (21) and nuts (23) in
grade 8.8 are not part of the scope of delivery!
Actuator size
Bolt size
MFI
M8 x 50
▪ Loosen the hex nuts (23) of the short bolts (21)
▪ Loosen the hex nuts (23) of the newly mounted assembly/disas-
sembly bolts (21)
evenly
in order to relax the springs (14).
▪ Remove the top cover (118)
▪ Remove the compression springs (14)
▪ Remove the intermediate ring (76)
▪ Replace the sealing ring (79), guide band (78) and O-rings (69)
▪ Unscrew the pins (2)
▪ Remove the piston (77) with the stem (1)
11.4
Springs
compression springs (14).
▪ Replace the compression springs (14) by new compression springs.
–
CAUTION!
Always replace the compression springs as a com-
plete set! Observe the arrangement of the compression springs
(14)!
Mounting position
Number of springs
Mounting at position
2
1 + 4
3
1 + 3 + 5
4
2 + 3 + 5 + 6
6
1-6
Illustration 9:
Spring arrangement