Side-Mounted Handwheel For Sizes 34 Through 60 Actuators - Emerson FISHER 657 Instruction Manual

657 Actuator (30-70 and 87)
December 2010
CAUTION
Over‐tightening the diaphragm casing cap screws and nuts (keys 22 and 23) can damage the diaphragm. Do not exceed 27
NSm (20 lbfSft) torque.
Note
Do not use lubricant on these bolts and nuts. Fasteners must be clean and dry.
8. Insert the cap screws (key 22), and tighten the hex nuts (key 23) in the following manner. The first four hex nuts
tightened should be diametrically opposed and 90 degrees apart. Tighten these four hex nuts to 13 NSm (10 lbfSft).
9. Tighten the remaining hex nuts in a clockwise, criss‐cross pattern to 13 NSm (10 lbfSft).
10. Repeat this procedure by tightening four hex nuts, diametrically opposed and 90 degrees apart, to a torque of 27
NSm (20 lbfSft).
11. Tighten the remaining hex nuts in a clockwise, criss‐cross pattern to 27 NSm (20 lbfSft).
12. After the last hex nut is tightened to 27 NSm (20 lbfSft), all of the hex nuts should be tightened again to 27 NSm
(20 lbfSft) in a circular pattern around the bolt circle.
13. Once completed, no more tightening is recommended.
14. Mount the actuator on the valve following the procedures in the Installation section.
Side‐Mounted Handwheel for Sizes 34 through 60 Actuators
A side‐mounted handwheel assembly (figures 11 and 12) is normally used as a manual actuator for sizes 34 through 60
actuators. Turning the handwheel counter‐clockwise past the neutral position opens the valve. Two levers (key 146,
figure 11) on a handwheel assembly operate the valve by moving the valve stem.
Instructions are given below for complete disassembly and assembly. Perform the disassembly only as far as necessary
to accomplish the required maintenance; then begin the assembly at the appropriate step.
Disassembly for Side‐Mounted Handwheel (Size 34‐60)
1. If desired, the handwheel assembly can be removed from the actuator yoke. To do this, remove the hex nuts (keys
147 and 170) from the U‐bolts (keys 166 and 143) that hold the assembly to the yoke.
2. Remove the retaining ring (key 154) and drive out the lever pivot pin (key 153).
3. Two screws (key 156) hold the right‐ and left‐hand levers (key 146) together. Remove the screw from the top of the
levers so that the levers will drop down out of the assembly. Disassemble further, if necessary, by removing the
other screw.
4. Remove the screw (key 161) and pointer mounting bolt (key 159, not shown) located behind pointer (key 160).
5. Remove the stop nut (key 54), lockwasher (key 150), and washer (key 149). Then remove the handwheel (key 51),
being careful not to lose the small ball (key 55) and spring (key 56).
6. Loosen the locking set screw (key 168, not shown). Then, using a suitable tool, unscrew the bearing retainer (key
136).
7. Pull the handwheel screw assembly (key 145) out of the handwheel body. The operating nut (key 132) will come
out with the screw. Also remove the bushing (key 151).
8. If required, remove the two ball bearings (key 152), one from the bearing retainer and the other from the
handwheel body.
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Instruction Manual
D100306X012