November 2022
Installation, Operation and Maintenance Manual
MAC050515 EN Rev. 0
17
Assembly Instructions
Section 10: Assembly Instructions
10.6
End Cap Assembly on Double-Acting Actuators
1.
Install the SAFEKEY O-Ring seals (12) to the SAFEKEY heads (13).
2.
Lightly grease the end cap O-Rings (2), the end cap grooves and the ends of the
body bore.
3.
Taking one of the end caps install its O-Ring and insert it into the Body.
4.
Holding the SAFEKEY close to the entry hole (cast identity letter C or D) to prevent
kinking, insert the SAFEKEY into the hole and gently push into place.
5.
With the SAFEKEY head in contact with the body, tighten with a screw driver to
gently compress the O-Ring and create a pressure seal.
6.
Repeat the operation for the other end cap.
7.
With the pistons together, mount the position indicator (7) to the top of
the pinion.
Spring color coding:
•
S20 Inner
=
Green
•
S20 Outer
=
Pink
•
S30 Outer
=
Brown
Spring set
Side of actuator
Outer
Inner
S40
Left
S20
-
Right
S20
-
S50
Left
S30
-
Right
S20
-
S60
Left
S30
-
Right
S30
-
S70
Left
S20
S20
Right
S30
-
S80
Left
S20
S20
Right
S20
S20
S90
Left
S30
S20
Right
S20
S20
S1C
Left
S30
S20
Right
S30
S20
10.7
Spring-Return Actuators
10.7.1
Spring Set Adjustments
The actual selection of the correct spring set can be done by either referring to the
torque charts given in the literature on Spring-Return actuators or by consulting your
local Hytork representative. After selecting the appropriate spring set, arrange the springs
as indicated below.
Table 6.
Spring Rating Chart
