Side-Mounted Handwheel Assembly For Size 70, 76, And 87 Actuators; Disassembly For Side-Mounted Handwheel (70, 76, & 87); Assembly For Side-Mounted Handwheel - Fisher 667 Instruction Manual

Type 667 Size 30-76 & 87
hex nuts (keys 170 and 147) to hold the handwheel
assembly in position. Cap screws (key 163) should be
tight against the yoke legs to provide stability. Tighten
nuts (key 144). Finish tightening the U-bolt nuts to 163
NSm [120 lbfSft] (key 170) and 41 NSm [30 lbfSft] (key
147). Be sure the handwheel assembly remains flat
against the mounting pad and perpendicular to the
yoke.
8. Position the levers (key 146) as shown in figure 13
or 14. Insert the lever pivot pin (key 153), and snap the
retaining ring (key 154) onto the lever pivot pin.
Side-Mounted Handwheel Assembly for
Size 70, 76, and 87 Actuators
A side-mounted handwheel assembly (figure 15) is
usually used as a manual actuator. Turning the hand-
wheel clockwise past the neutral position always
closes the valve body. A sleeve (key 123, figure 15) on
a handwheel assembly for a size 70, 76 or 87 actuator
opens the valve body 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;
and then begin the assembly at the appropriate step.
Disassembly for Side-Mounted Handwheel
(Sizes 70, 76, & 87)
1. Bypass the control valve. Reduce the loading pres-
sure to atmospheric. Disconnect the loading pressure
tubing or piping at the yoke.
2. Remove cover band (key 87), and relieve spring
compression by turning the spring adjuster (key 74)
counterclockwise.
3. Remove the cap screws and nuts (keys 13 and 14)
and lift off the upper diaphragm casing (key 1).
4. Remove the travel stop screw (key 12) and spacer
(key 2), and take off the diaphragm plate (key 4), the
diaphragm (key 3), and the lower diaphragm plate (key
71).
5. Unscrew the cap screws (key 90) and remove the
following connected parts: the lower diaphragm casing
(key 64), the O-ring (key 70), spring case adaptor (key
89), the seal bushing, O-rings, and snap ring (keys 7,
8, 9, and 72).
6. Remove the snap ring (key 72), and slide the seal
bushing and O-rings (keys 7, 8, and 9) out of the
spring case adaptor (key 89).
7. Take out the actuator spring (key 18).
8. Remove the stem connector (key 31) and stem
connector cap screws.
9. Pull the actuator stem (key 144) up and out of the
yoke. The spring seat (key 19), spring adjuster (key
14
74), thrust bearing (key 128), and the pinned adjusting
screw (key 131) will come out with the actuator stem.
10. Turn the handwheel so that the lower sleeve (key
123) extends out of the bottom of the yoke. DO NOT
move the neutral indicator scale (key 125).
11. Loosen two set screws (key 121), and unscrew
the bearing retainer flange (key 45). Take out the
worm gear and two thrust bearings (key 132), one on
each side of the gear.
12. The worm shaft (key 51) and associated parts can
be disassembled, if desired, by first removing hand-
wheel nut (key 127) and the handwheel (key 58). Do
not lose the small ball (key 141) and spring (key 142).
13. Loosen the set screw (key 52) for each worm
shaft retainer (keys 48 and 49). Unscrew the two worm
retainers (keys 48 and 49). The ball bearings (key 50)
will come out with the retainers.

Assembly for Side-Mounted Handwheel

(Sizes 70, 76, & 87)
1. The front and back worm retainers (keys 48 and
49) each have a slot in their threads for a set screws
(key 52). Pack the ball bearings (key 50) with lubricant
(key 239) or equivalent, and insert one ball bearing in
the back worm retainer (key 49) as shown in figure 15.
2. Thread the back bearing retainer and ball bearing
(keys 49 and 50) into the yoke. Align the slot in the
bearing retainer with the set screw hole in the yoke,
insert the set screw (key 52), and tighten it.
3. Coat the worm shaft (key 51) threads with lubricant
(key 239 or equivalent), and slide the shaft into the
yoke so that the end of the shaft fits snugly into the
back bearing retainer.
4. Insert the bearing in the front bearing retainer (key
49), and thread the retainer and ball bearing into the
yoke. Align the slot in the retainer with the hole in the
yoke, insert the set screw (key 52), and tighten it.
5. Put the spring and ball (keys 141 and 142) in the
handwheel (key 58). Slide the handwheel onto the
worm shaft (key 51). Thread the hex nut (key 127)
onto the worm shaft.
6. Pack the two needle bearings (key 132) and coat
the worm gear (key 44) threads with lubricant (key
239) or equivalent. Insert the key (key 122), the bear-
ings, and the worm gear in the yoke (key 73) as shown
in figure 15.
7. Slots are cut in the threads of the bearing retainer
flange (key 45). Thread the flange into the yoke so that
the slots and the holes for the set screws (key 121)
align. Insert the screws, and tighten them.