Table of Contents
Advertisement
Instruction Manual
D104496X012
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 desuperheater, reduce loading pressure to atmospheric, and remove the tubing or piping from the
upper handjack body (key 142).
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, step 4).
3. Thread the spring adjuster (key 12) out of the yoke (key 9) until all spring compression is relieved.
4. Remove the diaphragm casing cap screws and nuts (keys 22 and 23, figure 7), and lift off the upper diaphragm
casing and handwheel assembly.
5. 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.
6. 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.
7. 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.
8. Replace the O‐ring (key 138) in the body (key 142).
9. For a handwheel assembly used on actuators, complete the disassembly by driving out the groove pin (key 140,
figure 7) and sliding the pusher plate (key 135, figure 7) off the stem.
Assembly for Top‐Mounted Handwheel
1. For a handwheel assembly used on actuators, coat the end of the handwheel stem (key 133, figure 7) with
anti‐seize lubricant (key 244). Slide the pusher plate (key 135, figure 7), onto the stem, and drive in the groove pin
(key 140, figure 7) to lock the pieces together.
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).
5. Place the handwheel (key 51), and the stop nut (key 54) on the handwheel stem (key 133). Tighten the hex nut to
fasten the parts together. Secure the nut with the cotter pin (key 247).
6. If the body (key 142) was separated from the upper diaphragm casing (key 1, figure 7), lubricate the O‐ring (key
139) with lithium grease (key 241), and place the O‐ring in the body. Align the holes in the diaphragm casing and
the body, insert the cap screws (key 141), and tighten them evenly following a crisscross pattern to ensure a proper
seal.
7. Position the upper diaphragm casing (key 1, figure 7) on the diaphragm (key 2, figure 7) and align the holes.
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. Perform the following tightening sequence with a manual torque wrench.
657C Actuator (40i, 46i, and 60i)
November 2019
15
Advertisement
Table of Contents
