Size 80 Side-Mounted Handwheel; Disassembly - Fisher 657 Instruction Manual

657 Size 80 and 100 Actuators
December 2010
CAUTION
Over‐tightening the diaphragm casing cap screws and nuts can damage the diaphragm. Do not exceed 68 NSm (50 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 34 NSm (25 lbfSft).
9. Tighten the remaining hex nuts in a clockwise, criss‐cross pattern to 34 NSm (25 lbfSft).
10. Repeat this procedure by tightening four hex nuts, diametrically opposed and 90 degrees apart, to a torque of 68
NSm (50 lbfSft).
11. Tighten the remaining hex nuts in a clockwise, criss‐cross pattern to 68 NSm (50 lbfSft).
12. After the last hex nut is tightened to 68 NSm (50 lbfSft), all of the hex nuts should be tightened again to 68 NSm
(50 lbfSft) in a circular pattern around the bolt circle.
13. Once completed, no more tightening is recommended.
14. Install the actuator stem extension (key 116), diaphragm casing cover O‐rings (keys 112 and 113), and seal
bushing (key 111). Install the gear case cover (key 123) or the handwheel assembly (see figure 8).
15. Mount the actuator on the valve, and secure with the actuator‐to‐bonnet bolting. Refer to the Installation section
to connect actuator stem to valve plug stem.
Size 80 Side‐Mounted Handwheel
The side‐mounted handwheel assembly (figure 7) is normally used as a manual operator. The handwheel can be
mounted in either of two positions so that, regardless of valve plug action, counterclockwise rotation always opens
the valve. The assembly is a continuously connected type with an indicator to show neutral position. By rotating
handwheel away from neutral, the handwheel can be used to limit travel in either direction but not both directions at
the same time.
A grease fitting is provided on the gear box for periodic gear lubrication with a general‐purpose grease.
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.
Key numbers refer to figure 7.

Disassembly

1. Complete steps 1 through 9 of the disassembly portion of the size 80 actuator section.
2. Unscrew cap screws (key 64), and remove adjusting flange (key 36). Do not lose the key (key 47).
3. Unscrew the two screws (key 28), and remove travel stop indicator (key 58) from lower sleeve (key 46).
4. Turn handwheel (key 51) to raise lower sleeve. Continue turning handwheel until lower sleeve is free of worm gear
(key 44). Lift out lower sleeve, bearing and gear retainer, thrust bearings, and worm gear (keys 46, 66, 67, and 44).
5. The worm shaft (key 45) and associated parts can be removed in order to replace or lubricate them. First, remove
the handwheel cap (key 54) and the handwheel (key 51). Do not lose the small ball or spring (keys 55 and 56).
12
Instruction Manual
D100307X012