Emerson Fisher 667NS2 Instruction Manual page 17

Instruction Manual
D103472X012
10. Remove the actuator stem with the attached hex nuts (keys 132A and 132B), the upper diaphragm plate (key 107),
the diaphragm (key 105), and the lower diaphragm plate (key 108) by carefully sliding the lower end of the actuator
stem out of the seal bushing O‐rings (key 117) and lifting the actuator stem with attached parts clear of the
diaphragm casing. Lift using the 1/2-13 UNC tapped lifting hole on top of the actuator stem.
11. To aid in unfastening the actuator stem hex nuts (keys 132A and 132B) and to help prevent actuator stem damage,
attach the stem connector assembly onto the actuator stem and grip the stem connector in a vise while
unfastening the actuator stem hex nuts (keys 132A and 132B). Remove the hex nuts (keys 132A and 132B), and
inspect the actuator stem and associated parts.
12. Remove the snap ring (key 124), and lift the seal bushing (key 116) and O‐rings (keys 117 and 118) out of the
actuator yoke/casing assembly (key 109). The seal bushing has two 1/4-20 UNC tapped holes provided in its top
surface to be used as an aid in removing it.
13. Remove the O‐rings (key 117 and 118).
Size 80 Actuators with Side-Mounted Handwheel
Key number references are shown in figures 8 and 9.
The side­mounted handwheel assembly is normally used as a manual operator. The handwheel is mounted in such
position orientations that counterclockwise rotation always opens the valve. The assembly is a continuously
connected type with an indicator to show neutral position. By rotating the 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 case for periodic gear lubrication with Lubriplate Mag-1 (key 150).
Instructions are given below for complete disassembly and assembly in Assembly section. Perform the disassembly
only as far as necessary to accomplish the required maintenance; then, begin the assembly at the appropriate step.
1. Complete steps 1 through 9 of the Disassembly portion of the Size 80 Actuator section.
2. Unscrew the cap screws and washers (keys 174 and 176), and lift the spacer/diaphragm casing assembly (key 167)
and actuator stem (key 125) with the attached hex nuts (keys 132 and 198), the cap screws (key 197), the upper
diaphragm plate (key 107), the diaphragm (key 105), the lower diaphragm plate (key 108), travel stop nut (key
168), and set screw (key 170) by carefully sliding the lower end of the actuator stem out of the lower sleeve (key
163).
3. Loosen the set screws (key 170). Remove the stem travel stop nut (key 168) over the actuator stem (key 125).
4. Remove the actuator stem (key 125) with the attached hex nuts (keys 132 and 198), the cap screws (key 197), the
diaphragm plate (key 107), the diaphragm (key 105), and the lower diaphragm plate (key 108) by carefully sliding
the lower end of the actuator stem out of the seal bushing O­rings (key 117) and lifting the actuator stem with
attached parts clear of the diaphragm casing. Lift using the 1/2­13 UNC tapped lifting hole.
5. Remove the cap screws (key 197) from the hex nut (key 198). To aid in unfastening the actuator stem hex nuts
(keys 132 and 198) and to help prevent actuator stem damage, attach the stem connector assembly onto the
actuator stem and grip the stem connector in a vise while unfastening the actuator stem hex nuts. Remove the hex
nuts and attached parts, and inspect the actuator stem and associated parts.
6. Remove the snap ring (key 124), and lift the seal bushing (key 116) and O­rings (keys 117 and 118) out of the
spacer. The seal bushing has two 1/4­20 UNC tapped holes provided in its top surface to be used as an aid in
removing it.
7. Remove the O­rings (key 117 and 118).
8. Unscrew the two machine screws (key 171), and remove the travel stop indicator (key 164) off the lower sleeve
(key163).
9. Turn the handwheel (key 159) to raise the lower sleeve (key 163) until it is free of the worm gear. Lift out the lower
sleeve.
10. Remove the cap screws (key 196) and set screws (key 173) from the retainer thrust plate (key 165).
667NS2 Actuator
March 2022
17