Instruction Manual
D103799X012
685SE/685SR Piston Actuator
September 2014
10
1. Disconnect the actuator tubing from the pressure connections on the upper/lower head and outer spring cartridge
(keys 1/9 and 23) and positioner.
Note
Refer to the appropriate instruction manual for any maintenance or adjustments that need to be made on the positioner.
WARNING
To avoid personal injury due to the sudden uncontrolled movement of parts, do not loosen the stem connector cap screws
when the stem connector has spring force applied to it.
2. Break the stem connection by removing hex nuts (key 62),lockwashers(key10),andstuds(key63)fromthestem
connector (key 18).
3. Depending on the yoke boss size, there is either a yoke locknut or bonnettoactuator bolting securing the actuator
to the valve bonnet. Remove whichever is present.
4. For 685SE Actuators: Using the lifting points along the outside perimeter of the outer spring c artridge (key 23),
attach appropriate rigging gear to both lifting points and lift the actuator away from the valve bonnet and stem.
For 685SR Actuators: 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. Refer to the Actuator Mounting section of this manual for instructions on mounting and installing the actuator onto
avalve.
685SE Seal and O-ring Replacement
The following procedure is for the replacement of the internal piston seals, bearing seals, and O-rings.
If the actuator has a handwheel manual override proceed to step 1, otherwise proceed directly to step 7.
1. Using the same rigging and lifting points as in the Actuator Removal section, place the actuator rightside up with
the yoke (key 21) flat against the ground. Place either a flat piece of plywood or cloth under the outer spring
cartridge to protect the paint from scratches and chips.
2. Measure the gap between the piston rod (key 17) and the engage/disengage block (key 43) — up to 1/8 inch — and
make note as this will be used during reassembly.
3. Removethesetscrew(key36)fromtheengage/disengageblock(key43).
4. Remove the hex head cap screws (key 20) and lock washers (key 10) that secure the yoke (key 21) to the lower head
(key 9).
5. Using the same lifting eyes as in the Actuator Removal section, attach appropriate rigging gear and remove the
cylinderassemblyfromtheyoke(key21).Therigginggearshould allow the cylinder to be rotated freely. Rotate the
cylinder assembly to unscrew the engage/disengage block (key 43) from the piston rod (key 17). After the
engage/disengage block is removed, secure the cylinder assembly to the yoke using the hex head cap screws (key
20) and lock washers (key 10).
6. Using the same rigging and lifting points as in the Actuator Removal section, place the actuator upsidedown with
theouterspringcartridge(key23)flatagainsttheground.Placeeitheraflatpieceofplywoodorclothunderthe
outer spring cartridge to protect the paint from scratches and chips.
7. Removethelowerhead(key9)fromtheyoke(key21)byremoving hex head cap screws (key 20) and lock washers
(key 10).
(28 paginas)
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