Emerson Fisher 667NS2 Instruction Manual page 21

Instruction Manual
D103472X012
disassembly procedures for size 80 actuators. Also, make sure that the spring adjusting screw properly engages the
spring seat. Then, using a striking wrench and a dead blow hammer, seat the jam nut with several strong hits until
the jam nut does not turn with repeated impacts.
15. Screw the two hex nuts (key 115) onto the valve plug stem. Mount the actuator on the valve body, and make the
stem connection by following the procedures in the Mounting the Actuator on the Valve section.
Size 80 Actuators with Side­Mounted Handwheel
Key number references are shown in figures 8 and 9.
1. Press fit key (key 166) into slot on the bottom of the gear case (key 151). If the key is too tight to fit, file or grind the
key slightly for a better fit.
2. Place the gear case (key 151) on the top of the yoke (key 109) with the worm shaft opening on the right, when
facing the Fisher Logo on the yoke (key 109).
3. Coat the gear case hex cap screws (key 169) with Nuclear Grade anti-seize lubricant (key 27). Thread the hex cap
screws (key 169) into the gear case (key 151) from the bottom side of yoke flange with one washer (key 175) per
hex cap screw until hand tight. Torque the gear case hex cap screws (key 169) to 292 N•m (215 ft•lbf) using a
criss-cross tightening pattern.
4. Pack the two ball bearings (key 153) with Lubriplate Mag-1 (key 150). Coat the worm shaft (key 154) threads with
Lubriplate Mag-1 (key 150), and slide the shaft into the gear case (key 151).
5. Insert the ball bearing (key 153) in the Nuclear Grade anti-seize lubricant (key 27) coated front worm retainer (key
155), and thread the retainer and ball bearing into the gear case. The bearing should not be loose. Make sure to
align the set screw slot in the retainer with the set screw hole in the gear case (key 151). Insert the Loctite 242 (key
185) applied set screw (key 170), and tighten.
6. Insert the ball bearing (key 153) in the back worm retainer (key 152). Thread the Nuclear Grade anti-seize lubricant
(key 27) coated back worm retainer (key 152) and ball bearing (key 153) into the gear case (key 151), so that the
end of the shaft fits snugly in the back worm retainer (key 152). Align the set screw slot in the worm retainer (key
152) with the set screw hole in the gear case (key 151). Apply Loctite 242 (key 185) to the set screw (key 170).
Insert the set screw (key 170), and tighten.
7. Put the spring (key 157) and ball (key 158) in the handwheel (key 159). Slide the handwheel (key 159) onto the
worm shaft (key 154). Make sure the ball (key 158) does not fall out of the hole in the front worm retainer (key 155).
Thread the handwheel cap (key 156) onto the worm shaft, insert the Loctite 242 (key 185) applied set screw (key
170), and tighten.
8. Lubricate the two thrust bearings (key 160) with Lubriplate Mag-1 (key 150). Install one thrust bearing (key 160);
then install the worm gear (key 161), followed by the second thrust bearing (key 160). Make sure the raised bearing
surface of the thrust bearings (key 160) is towards the worm gear.
9. Install the gear retainer (key 162) and retainer thrust plate (key 165) into the gear case (key 151). Make sure the
retainer thrust plate (key 165) has the side with two patterns of threaded holes facing up. Use an appropriate tool
and carefully install the retaining ring (key 172) into the groove of the gear case (key 151).
10. Thread the Loctite 242 (key 185) applied set screw (key 173) into the retainer thrust plate (key 165) and adjust the
set screws to eliminate free play in the thrust bearings. Then torque them to approximately 14 N•m (10 ft•lbf)
using a criss-cross tightening pattern. Thread the Loctite 242 (key 185) applied button head cap screws (key 196)
into the retainer thrust plate (key 165), then torque them to approximately 14 N•m (10 ft•lbf).
11. The lower sleeve (key 163) has two screw holes in one end. Coat the lower sleeve threads with Lubriplate Mag-1
(key 150), slide the end of the lower sleeve without the holes, into the gear case and worm gear (key 161) from the
bottom of the gear case. Turn the handwheel (key 159), and feed the lower sleeve through the worm gear. Ensure
that the key (key 166) in the gear case engages the slot in the lower sleeve (key 163). Continue turning the
handwheel until the lower sleeve protrudes from the retaining flange. Fasten the travel stop indicator (key 164) to
the lower sleeve with two machine screws (key 171).
12. Lubricate the O­rings (key 117, 118), and fill the seal bushing with NyoGel 718B (key 149). Install two O­rings (key
117) into the grooves in the inner diameter of the seal bushing (key 116). Install one O­ring (key 118) into the
667NS2 Actuator
March 2022
21