November 2022
Installation, Operation and Maintenance Manual
MAC050515 EN Rev. 0
17Assembly 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
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