Top-Mounted Handwheel Assembly (Adjustable Down Travel Stop); Disassembly For Top-Mounted Handwheel - Fisher 667 Instruction Manual

Type 667 Size 30-76 & 87
3. Fill the seal bushing with lubricant (key 237 or
equivalent), slide the bushing into the yoke (key 73),
and install the snap ring (key 72).
4. Assemble the actuator stem (key 144), lower dia-
phragm plate (key 71), diaphragm (key 3), upper dia-
phragm plate (key 4), and the travel stop cap screw
and spacer (keys 12 and 2). Coat the cap screw
threads with Lubriplate Mag-1 or equivalent (key 237).
Tighten the cap screw (key 12) to 41 NSm (30 lbfSft)
torque for size 30 actuators, 68 NSm (50 lbfSft) torque
for size 34 and 40 actuators, or 183 NSm (135 lbfSft)
torque for size 45 to 76 and 87 actuators. Place this
assembly in the actuator. Take care when pushing the
actuator stem through the seal bushing so that the
threads do not damage the O-rings.
When you replace actuator diaphragms
in the field, take care to ensure the dia-
phragm 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 for size 30-76 and 87 ac-
tuators.
CAUTION
Over-tightening the diaphragm cap
screws and nuts (keys 13 and 14) can
damage the diaphragm. Do not exceed
27 NSm (20 lbfSft) torque.
Do not use lubricant on these bolts and
nuts. Fasteners must be clean and dry.
5. Install the upper diaphragm casing (key 1), and
install the cap screws and nuts (keys 13 and 14).
Tighten the diaphragm cap screws and nuts in the fol-
lowing manner.
6. The first four bolts tightened should be diametrically
opposed and 90 degrees apart. Tighten these four
bolts to 13 NSm (10 lbfSft).
7. Tighten the remaining bolts in a clockwise, criss-
cross pattern to 13 NSm (10 lbfSft).
8. Repeat this procedure by tightening four bolts, dia-
metrically opposed and 90 degrees apart, to a torque
of 27 NSm (20 lbfSft).
9. Tighten the remaining bolts in a clockwise, criss-
cross pattern to 27 NSm (20 lbfSft).
10
Note
Note
10. After the last bolt is tightened to 27 NSm
(20 lbfSft), all of the bolts should be tightened again to
27 NSm (20 lbfSft) in a circular pattern around the bolt
circle.
11. Once completed, no more tightening is recom-
mended.
12. Install the actuator spring (key 18) and spring seat
(key 19). Apply lubricant (key 239 or equivalent) to the
threads of the actuator stem and to the surface of the
spring adjuster (key 74) that contacts the spring seat.
Thread the spring adjuster onto the actuator stem.
13. Mount the actuator onto the valve in accordance
with the procedures in the Installation section.
Top-Mounted Handwheel Assembly
(Adjustable Down Travel Stop)
Actuator key numbers are shown in figures 6, 7, and 8.
And, top-mounted handwheels are shown in figures 9,
11, and 12.
If repeated or daily manual operation is
expected, the actuator should be
equipped with a side-mounted hand-
wheel rather than a casing-mounted
travel stop or top-mounted handwheel.
The side-mounted handwheel is de-
signed for more frequent use as a manu-
al operator.
A top-mounted handwheel assembly (figures 9, 11,
and 12) is usually used as an adjustable down travel
stop to limit full extension of the actuator stem. Turning
the handwheel counterclockwise pulls the extension
rod (key 150, figures 9, 11, and 12) up, retracting the
actuator 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 Top-Mounted Handwheel

1. Bypass the control valve, reduce loading pressure
to atmospheric, and remove the tubing or piping from
the connection in the top of the yoke (key 73, figures 6,
7, and 8).
2. Turn the handwheel (key 58) clockwise so that the
handwheel assembly is not causing any spring com-
pression.
3. Turn the actuator spring adjuster (key 74) to relieve
all the compression from the spring (key 18).
4. If servicing just the thrust bearing, races, and hand-
wheel screw (keys 180, 181, and 160), use the follow-
ing steps:
Note