Emerson Fisher 657 Instruction Manual page 14

657 Actuator (30/30i-70/70i and 87)
June 2018
Instructions are given below for complete disassembly and assembly of the top‐mounted handwheel assembly.
Perform the disassembly only as far as necessary to accomplish the required maintenance; then, begin the assembly at
the appropriate step.
Key numbers refer to figure 11 (sizes 30/30i through 60/60i) and figure 12 (sizes 70/70i and 87), unless otherwise
indicated.
Disassembly for Top‐Mounted Handwheel
1. Turn the handwheel (key 51) counter‐clockwise so that the handwheel assembly is not causing any spring
compression.
2. Bypass the control valve, reduce loading pressure to atmospheric, and remove the tubing or piping from the upper
handjack body (key 142, figures 11 or 12).
WARNING
To avoid personal injury from the precompressed spring force thrusting the upper diaphragm casing (key 1) away from the
actuator, thread the spring adjuster (key 12) out of the yoke until all spring compression is relieved, then carefully remove
casing cap screws (key 22).
3. Remove the diaphragm casing cap screws and nuts (keys 22 and 23, figures 6, 7, 8, 9, or 10), and lift off the upper
diaphragm casing and handwheel assembly.
4. If necessary, the handwheel assembly can be separated from the diaphragm casing by removing the cap screws
(key 141). This may be necessary to replace the O‐ring (key 139), or for ease of handling.
5. Loosen the travel stop locknut (key 137), and turn the handwheel (key 51) counter‐clockwise. Remove the cotter
pin and stop nut (keys 247 and 54), then lift off the handwheel.
6. Unscrew the travel stop locknut (key 137) from the handwheel stem (key 133), and turn the stem out of the bottom
of the body (key 142). A screwdriver slot is provided on the top of the stem for this purpose.
7. Replace the O‐ring (key 138) in the body (key 142).
8. For a handwheel assembly used on sizes 30/30i through 60/60i actuators, complete the disassembly by driving out
the groove pin (key 140, figure 11) and sliding the pusher plate (key 135, figure 11) off the stem.
For a handwheel assembly used on a sizes 70/70i or 87 actuator, complete the disassembly by unscrewing the
retaining screw (key 174, figure 12) and removing the thrust bearing and pusher plate (keys 175 and 135, figure 12).
Because the retaining screw (key 174) has left‐hand threads, turn clockwise to loosen.
Assembly for Top‐Mounted Handwheel
1. For a handwheel assembly used on sizes 30/30i through 60/60i actuators, coat the end of the handwheel stem (key
133, figure 11) with anti‐seize lubricant (key 244). Slide the pusher plate (key 135, figure 11), onto the stem, and
drive in the groove pin (key 140, figure 11) to lock the pieces together.
For a handwheel assembly used on a sizes 70/70i or 87 actuator, pack the thrust bearing (key 175, figure 12) with
anti‐seize lubricant (key 244). Place the thrust bearing in the pusher plate (key 135, figure 12), slide the two parts onto
the handwheel stem (key 133). Coat the retaining screw threads with thread locking sealant (key 242). Insert and
tighten the retaining screw (key 174, figure 12).
2. Coat the O‐ring (key 138) with lithium grease (key 241), and insert the O‐ring in the body (key 142).
3. Coat the threads of the handwheel stem (key 133) with anti‐seize lubricant (key 244). Screw the stem into the body
(key 142).
4. Thread the travel stop locknut (key 137) onto the handwheel stem (key 133).
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Instruction Manual
D100306X012