Emerson Process Management 667 - Manual (Page 15)

Instruction Manual
D100311X012
667 Size 80 and 100 Actuators
May 2011
15
For Actuators Without the Top‐Loaded Option
Disassembly
Part names and locations are shown in figure 5. Size 100 actuator key number locations are shown in figure 7.
1. Unscrew the diaphragm casing cap screws and nuts (keys 13 and 14) and remove the upper diaphragm casing.
2. For actuators without a top‐mounted handwheel, unscrew and remove the travel stop cap screw (key 12), if one is
used, and the hex nut (key 24).
3. For actuators with a top‐mounted handwheel (see figure 9), remove the hex nut, actuator stem extension, and
actuator stem connector (keys 28, 36, and 42).
4. Remove the washer, upper diaphragm plate, diaphragm, diaphragm retainer, and backup plate (keys 37, 4, 3, 5 and
6).
5. Unscrew the six cap screws (key 11), and remove the seal bushing retainer (key 10). Remove the seal bushing (key
7).
WARNING
To avoid personal injury and property damage from the sudden release of spring load, be sure that all spring load is
removed from the actuator lower diaphragm casing.
6. Unscrew the four hex nuts that secure the lower diaphragm casing to the yoke assembly (key 67), and remove the
lower diaphragm casing. Replace the yoke assembly O‐rings (key 70) as necessary.
7. The actuator spring (key 18) and stem (key 144) can now be removed if necessary. Be sure to disconnect the stem
connector (key 31) before removing the stem.
8. Refer to the following Assembly procedures. Carefully clean and inspect all parts, or obtain replacement parts
required for reassembly.
Assembly
1. If the actuator stem (key 144, figure 7) was removed, lubricate the threads on the stem with lithium grease
lubricant (key 237).
2. On the actuator stem, assemble the hex nuts, thrust bearing, and spring seat (keys 26, 25, 86, and 19) to the stem.
Be certain that the thrust bearing race with the larger inside diameter faces the spring seat. Rotate the adjusting
nut (key 25) to position the spring seat 305 mm (12 inches) from the end of the stem.
3. Install the actuator stem assembly into the yoke assembly (key 67). Place a support under the stem to position the
lower end of the stem 254 mm (10 inches) above the bottom surface of the actuator (actuator‐to‐bonnet joint).
Note
When installing lower diaphragm casing, install the O‐rings (key 70) into the grooves found in the lower diaphragm casing before
placing the casing on the yoke assembly. If the spring interferes with installation of the lower diaphragm casing, reposition the
spring by rotating the adjusting nut (key 25).
4. Install the lower diaphragm casing, and secure it by tightening the four hex nuts.
5. Lubricate the seal bushing O‐rings (keys 8 and 9) and the seal bushing (key 7) with lithium grease lubricant. Install
the seal bushing O‐rings, seal bushing, and seal bushing retainer (keys 8, 9, 7 and 10) and secure with the cap
screws (key 11).