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

Instruction Manual
D100310X012

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.
Note
If repeated or daily manual operation is expected, the actuator should be equipped with a side-mounted handwheel rather than a
casing-mounted travel stop or top-mounted handwheel. The side-mounted handwheel is designed for more frequent use as a
manual 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 compression.
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 handwheel screw (keys 180, 181, and 160), use the following steps:
D Remove the cap and take out the cotter pin. Remove the castle nut, bearing retainer, thrust bearing, and races (keys
247, 167, 166, 180, and 181).
D Use the handwheel to remove the handwheel screw (key 160) from the handwheel body (key 148).
D If necessary, remove the extension rod (key 150) at this time. Most maintenance procedures do not require the rod
to be removed.
D Clean and inspect all parts or replace parts as necessary. Upon re-assembly, lubricate handwheel threads, bearings,
and races with anti-seize lubricant (key 239).
D Lubricate and re-install the handwheel screw into handwheel body (key 148). Lubricate and replace the races,
bearing, and retainer (keys 181, 180, and 182). Replace the castle nut (key 166), tighten it, and insert the cotter pin
(key 167). Replace the handwheel cap (key 247).
5. For size 30 through 60 and 76 actuator handwheels (figures 9 and 11):
D Remove the cap screws (key 161). Make sure that the guide plate can turn between the handwheel body and the
mounting plate (keys 157, 148 and 158).
D Remove the cap (key 247) and cotter pin (key 167). Remove the castle nut (key 166) and, if necessary, unscrew the
extension rod (key 150). Remove the rod, the handwheel body (key 148), and the attached parts.
D Remove the hex nuts and cap screws (keys 14 and 13, figures 6, 7, and 8) from the diaphragm casings. Lift off the
upper diaphragm casing (key 1) and the mounting plate (key 158).
667 Size 30-76 and 87 Actuators
June 2011
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