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Instruction Manual
D103626X012
Actuator Removal
The following procedure is for the removal of the actuator from a valve.
1. Disconnect the actuator tubing from the pressure connections on the upper and lower heads (keys 1 and 9) and
positioner.
Note
Refer to the appropriate instruction manual for any maintenance or adjustments that need to be made on the positioner.
2. Break the stem connection by removing hex nuts (key 57), studs (key 58), and lock washers (key10) from the stem
connector (key 18).
3. Remove the bonnet-to-actuator bolting securing the actuator to the valve bonnet.
4. Thread two lifting eyes into the free ports on the upper head (key 1) 180 degrees apart. Reference tables 4 and 5 for
approximate weights of the actuator to select an appropriate lifting eye. Attach appropriate rigging gear to both
lifting eyes and lift the actuator away from the valve bonnet and stem.
5. Place the actuator upside-down with the upper head (key 1) flat against the ground. Cloth or wood should be used
to prevent against paint damage.
6. Refer to the Actuator Mounting section of this manual for instructions on mounting and installing the actuator onto
a valve
Seal and Oring Replacement
The following procedure is for the replacement of the internal piston seals, bearing seals, and Orings.
1. Complete Actuator Removal procedures above.
2. Loosen tie bolt hex nuts (key 11) in a crisscross pattern. Remove tie rod hex nuts and lock washers (key 10).
3. Remove the yoke (key 21) and the lower head (key 9) assembly from the cylinder (key 4) and place onto a flat
surface with the Oring side facing up. Using straps, secure this assembly to a solid structure to prevent it from
falling over.
4. Extract bearing assembly (keys 12, 13, 14, and 15) from lower head (key 9) by removing the bearing retaining ring
(key 16).
5. Remove the piston wiper seal (key 15), Oring (key 13), and quad seal (key 12) from the bearing (key 14).
6. Clean bearing (key 14) with a light degreaser, if needed.
7. Lightly grease the new Oring (key 13) and quad seal (key 12), then install onto bearing (key 14). Without grease,
install a new piston wiper seal (key 15) onto the bearing.
8. Reinstall bearing assembly (keys 12, 13, 14, and 15) into lower head (key 9) and secure in place with the bearing
retaining ring (key 16).
9. Remove the Oring (key 2) from the lower head (key 9) and clean the groove with a light degreaser.
10. Lightly grease the new Oring (key 2) and install on lower head (key 9).
11. Remove tie bolts (key 3) from upper head (key 1).
12. Lift piston assembly (keys 5, 6, 7, 17, and 19) out from cylinder (key 4) and place on a flat surface.
13. Remove the wear ring (key 6) and quad seal (key 7) from the piston (key 5).
14. Thread locking compound is applied to the threads of the piston rod (key 17) by the manufacturer during initial
assembly. As a result, disassembly will require heating to loosen the thread locking compound. To remove the
685 Piston Actuator
June 2017
9
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