Emerson Process Management 667 - Manual (Page 10)

Instruction Manual
D100311X012
667 Size 80 and 100 Actuators
May 2011
10
b. Using a wrench on the wrench flats near the top of the stem and piston assembly, unscrew the stem and piston
assembly from the actuator stem.
c. Unscrew the cap screws (key 106), and remove the cylinder (key 93) and attached parts.
11. To disassemble snubber:
a. Remove the retaining rings, cylinder heads, and stem and piston assembly (keys 95, 94,
and 23).
b. Replace packing and O‐rings (keys 118, 119, 96, 107, and 120).
c. Unscrew the spring case adaptor cap screws and nuts (keys 90 and 91), and remove the adaptor (key 89) from
the actuator.
12. Remove the actuator spring and spring seat (keys 18 and 19).
13. Unscrew the cap screws and nuts (keys 88 and 91), and remove the spring case (key 85).
Note
In figure 8, the cap screws (key 88) on units with side‐mounted handwheels do not use hex nuts (key 91).
14. Remove the spring adjustor (key 74) and the attached thrust bearing (key 86).
15. Remove the cap screws (key 252), yoke bushing retainer (key 251), 2 halves of the split yoke bushing (key 249),
and yoke bushing holder (key 250).
16. Refer to the size 80 actuator assembly procedures. Carefully clean and inspect all parts, and obtain any
replacement parts required for reassembly.
Assembly
See figure 4, Size 80 Actuator Construction for location of parts.
1. Coat the threads of the stem (key 144) with lithium grease lubricant (key 237). Install the spring adjustor (key 74)
and thrust bearing. Pack the bearing (key 86) with lithium grease lubricant.
2. Mount the spring case (key 85) to the yoke (key 73) using cap screws and hex nuts (keys 88 and 91).
Note
Units with a side‐mounted handwheel do not use hex nuts (key 91).
3. Install the spring adjustor, thrust bearing, and spring seat (keys 74, 86 and 19) onto the actuator stem (key 144).
Slide the stem into the spring case (key 85).
4. Align the spring seat (key 19) on the spring adjustor (key 74), and slide the actuator spring (key 18) squarely onto
the spring seat.
5. Mount the spring case adaptor (key 89) to the spring case (key 85) using cap screws and hex nuts (keys 90 and 91).
6. For actuators with a snubber (see figure 8), install the cylinder (key 93) and attached parts with cap screws (key
106). Slide the stem and piston assembly (key 23) into the cylinder and thread onto the actuator stem (key 144).
Attach the travel stop (key 84), if one is used, to the stem and piston assembly.