Instruction Manual
D100304X012
656 Actuator
June 2017
5
Figure 2. Travel Stop Orientation for Size 60
11A0001‐A
A
A
A
MOUNTING BOSS
ON ACTUATOR YOKE
LOCATE FOUR TRAVEL
STOPS MARKED A
MOUNTING BOX
ON ACTUATOR YOKE
7. Take out the actuator spring (key 6).
8. The lower diaphragm case (key 5) can be removed from the yoke, if required, by loosening the travel stops and cap
screws (keys 7 and 8).
9. Remove the lower spring seat (key 11) and thrust bearing (key 13). Unscrew the lower bearing seat (key 14) from
the adjusting screw (key 12).
10. Remove the set screw (key 22) and remove the adjusting screw to complete disassembly.
Assembly
1. Apply lithium grease lubricant, or equivalent, to the adjusting screw threads (key 12) and screw this into the yoke
(key 9). Replace set screw (key 22). The set screw should engage the machined thread relief in the adjusting screw.
2. With the eared portion up, screw the lower bearing seat (key 14) all the way onto the adjusting screw.
3. Apply lithium grease lubricant, or equivalent, to the thrust bearing (key 13) and position it on the lower bearing seat
(key 14). Lay the lower spring seat (key 11) on top of the thrust bearing assembly.
4. Mount the lower diaphragm case (key 5) to the top of the yoke (key 9) using the travel stops and cap screws (keys 7
and 8). Alternate screws and travel stops on the sizes 30 and 40. See figure 2 for the correct orientation of the size
60.
5. Position the actuator spring (key 6) on the lower spring seat.
6. Attach the diaphragm plate (key 4) to the actuator stem (key 10) with the cap screw (key 3). Apply lithium grease
lubricant, or equivalent, to the stem. Place this assembly, actuator stem first, into the yoke with the actuator stem
through the spring adjustor (key 12).
7. Position the diaphragm (key 2) on the diaphragm plate (key 4) and align the holes with the lower diaphragm casing
(key 5). Attach the upper diaphragm case (key 1) to the lower diaphragm casing (key 5) using the cap screws and
nuts
(keys 19 and 20).
Note
When you replace actuator diaphragms in the field, take care to ensure the diaphragm casing bolts are tightened to the proper
load to prevent leakage, but not crush the material.
