Emerson Process Management FISHER 657 - Manual (Page 16)

Instruction Manual
D100306X012
657 Actuator (30-70 and 87)
December 2010
16
6. Separate the halves of the stem connector assembly (key 26) by removing the two cap screws. Remove the
actuator stem (key 10).
7. Remove the travel indicator (key 14).
CAUTION
To avoid possible product damage, do not move the neutral indicator scale after completing the following step.
8. Turn the handwheel to raise the lower sleeve (key 46) until it is free of the worm gear (key 44). Lift out the lower
sleeve and the key (key 47). DO NOT move the neutral indicator scale (key 59).
9. Loosen two set screws (key 40), then unscrew the bearing retainer flange (key 39) and the attached spring adjuster
(key 12), using a suitable tool in the open neck of the flange. Take out the gear and two needle bearings (key 42),
one on each side of the gear.
10. Remove the spring adjuster (key 12) from the bearing retainer flange (key 39). If desired, the worm shaft (key 45)
and associated parts can be disassembled to replace or lubricate them. To do so, first remove the stop nut (key 54)
and the handwheel (key 51). Do not lose the small ball (key 55) and spring (key 56).
11. Loosen the two set screws (key 41), and unscrew the front and back retainers (keys 48 and 49). The ball bearings
(key 50) will come out with the retainers. Remove the worm shaft (key 45).
Assembly for Side‐Mounted Handwheel (Size 70 & 87)
1. The front and back retainers (keys 48 and 49) each have a slot in their threads for a set screw (key 41). Pack the ball
bearings (key 50) with anti‐seize lubricant (key 244), and insert one ball bearing into the back retainer (key 49) as
shown in figure 13.
2. Thread the back retainer and ball bearing (keys 49 and 50) into the yoke (key 9). Align the slot in the bearing
retainer with the set screw hole in the yoke, insert the set screw (key 41), and tighten it.
3. Coat the worm shaft (key 45) threads with anti‐seize lubricant (key 244), and slide the shaft into the yoke so that
the end of the shaft fits snugly into the back retainer (key 49).
4. Insert the bearing into the front retainer (key 48), and thread the retainer and ball bearing into the yoke (key 9).
Align the slot in the retainer with the hole in the yoke, insert the set screw (key 41), and tighten it.
5. Put the spring and ball (keys 56 and 55) into the handwheel (key 51). Slide the handwheel onto the worm shaft (key
45). Thread the stop nut (key 54) onto the shaft.
6. Pack the two needle bearings (key 42) and coat the worm gear (key 44) threads with anti‐seize lubricant (key 244).
Insert the key (key 47), the bearings, and the gear into the yoke (key 9) as shown in figure 13.
7. Slots are cut into the threads of the bearing retainer flange (key 39). Thread the flange into the yoke (key 9) so that
the slots and the holes for the set screws (key 40) align. Insert the screws, and tighten them.
8. The lower sleeve (key 46) has milled slots in one end. Coat the sleeve threads with lithium grease (key 241), then
slide the end of the lower sleeve with the milled slots into the bearing retainer flange (key 39).
9. Turn the handwheel (key 51), and feed the sleeve through the gear so that the slot in the lower sleeve (key 46)
engages the key (key 47) in the yoke (key 9). Continue turning the handwheel until the lower sleeve protrudes 93.7
mm (3.69 inches) below the surface of the yoke. The pin in the side of the lower sleeve should line up with the
extension on the neutral indicator.
10. Slide the square end of the actuator stem (key 10) through the lower sleeve (key 46) so the stem contacts the
valve stem. Clamp both stems in the two halves of the stem connector (key 26). 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 stem connector halves together with the cap screws.
11. Pack the needle bearing and race (keys 37 and 38) with lithium grease (key 241), and slide the bearing onto the
spring adjuster (key 12).