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667 Actuator (Size 30/30i - 76/76i and 87)
June 2017
6. Pack the two needle bearings (key 132) and coat the worm gear (key 44) threads with anti‐seize lubricant (key 239).
Insert the key (key 122), the bearings, and the worm gear in the yoke (key 73) as shown in figure 20.
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.
8. The lower sleeve (key 123) has a milled groove in one end. Coat the sleeve threads with anti‐seize lubricant (key
239), slide the end of the lower sleeve with the groove into the bearing retainer flange, turn the handwheel, and
feed the sleeve through the worm gear so that the slot in the lower sleeve engages the key (key 122) in the yoke.
Continue turning the handwheel until the lower sleeve protrudes 81 mm (3.19 inches) below the surface of the
yoke. The bottom of the lower sleeve should be even with the bottom of the extension on the neutral indicator.
9. Pack the thrust bearing (key 128) with anti‐seize lubricant (key 239). Slide the actuator stem (key 144) and the
attached adjusting screw (key 131), pin (key 130), thrust bearing (key 128), spring seat (key 19), and spring adjuster
(key 74) into the yoke. The lower end of the stem slides through the lower sleeve (key 123) and the lower sleeve
slides into the adjusting screw (key 131), as shown in figure 20.
10. Position the actuator stem (key 144) against the valve stem. Clamp both stems between the two halves of the
stem connector (key 31), and be sure the threads are engaged properly on both stems. The stem connector should
not be closer than 3.2 mm (1/8 inches) to the lower sleeve when the actuator stem is in the retracted position. This
adjustment will provide approximately 3.2 mm (1/8 inches) of free travel of the lower sleeve in either direction for
manual operation. Fasten the halves together with the cap screws.
11. Put the actuator spring (key 18) in the yoke on the spring seat (key 19).
12. Coat the O‐rings (keys 8 and 9) with lithium grease (key 237), and insert them in the seal bushing (key 7). Slide the
seal bushing and O‐rings into the spring case adaptor (key 89).
13. Install the snap ring (key 72).
14. Slide the seal bushing and O‐rings (keys 7, 8, and 9) over the actuator stem (key 144), and position the spring case
adaptor (key 89), lower diaphragm casing (key 64), and O‐ring (key 70) on the yoke.
15. Insert and tighten the cap screws (key 90).
16. Slide the lower diaphragm plate (key 71), the diaphragm (key 3) with the patterned side up, the diaphragm plate
(key 4), the spacer (key 2), and the cap screw (key 12) on the actuator stem (key 144). Tighten the cap screw.
17. Put the diaphragm casing (key 1) on the diaphragm. Align the holes in the diaphragm (key 3) and the diaphragm
casings (keys 1 and 64).
Note
When you replace actuator diaphragms in the field, take care to ensure the diaphragm 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 30/30i‐76/76i and 87 actuators.
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.
Note
Do not use lubricant on these bolts and nuts. Fasteners must be clean and dry.
18. Install the cap screws and hex nuts (keys 13 and 14) and tighten in the following manner.
22
Instruction Manual
D100310X012
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