Cashco C27 - C53 Actuator - Manual (Page 3)

IOM-C27-C53 IOM-C27-C53 33
4. Loosen all fl ange bolting (18,19,20,21) two
revolutions. Pry apart the casings (1,2) if
“stuck” together.
5. In one revolution increments loosen all op-
pos ing nuts (20, 21) until the short bolting
(18, 20) disengages and can be removed.
Con tin ue loosening long nuts (21) in the
alternating, one revolution pattern ensur-
ing that the cas ings (1,2) are being “pushed
apart”, until the long bolting (19, 21) is dis-
engaged and removed.
For Air-to-Close Construction:
6. Remove top case (1). Secure the fl ats on
the lower end of the actuator stem (6) with
a wrench. With a second wrench rotate
the upstop fl ex nut (52) CCW and remove.
Note: Item (52) not used if actuator has
handwheel.
7. Re-secure the fl ats on stem and with a 9/16”
socket wrench rotate bolt (12) CCW to re-
move.
8. Lift out lock washer (22), diaphragm washer
(14) and O-ring (15). Remove diaphragm (7).
NOTE: To replace stem bushing (39) and o-ring
(17) refer to Step F.
9. Install new diaphragm (7) over the diaphragm
plate (8), convoluted side down. Align bolt
holes in diaphragm with holes in lower case.
10. Install new new o-ring (15) and reposition
washers (14 & 22) on top of diaphragm.
11. Apply Loc-tite #242 or equal to stem bolt (12)
threads, tighten stem bolt (12) to actuator
stem (6) with 35 ft-lbs. torque.
12. Place upper case on lower case align top and
bottom cases (1,2) per B.3 previous. Install
long bolting (19) and nuts (21) equally spaced
around the bolt circle - fi nger tighten.
13. Install remaining short bolts (18) and nuts
(20). Torque all bolting to 75 in-lbs.
14. Thread upstop fl ex nut (52) [coupling as-
sembly (33) for handwheel option] onto the
actuator stem (6) and engage until just past
stem fl ats. NOTE: Upstop position cannot
be set until actuator is mounted on the body
and the bench range is set.
For Air-to-Open Construction:
15. Remove top case (1). Place matchmarks
on spring plate (9) to mark location of the
springs (10). Remove springs (10).
16. Rotate upstop fl ex nut (52) CCW and remove.
Note: Item (52) not used if actuator has
handwheel assembly.
17. Secure the fl ats on stem (6) and with a 9/16”
socket wrench rotate bolt (12) CCW to re-
move.
18. Remove lock washer (22) and spacer (5).
19. Remove spring plate (9) diaphragm plate (8),
diaphragm (7), o-ring (15) and diaphragm
washer (14).
20. Grasp stem (6) with hand and pull down thru
the attachment hub (4). Remove o-ring (17)
from stem (6). Lubricate new o-ring (17) with
Lubri-plate or equivalent and install on stem
(6).
21. From the top of the attachment hub (4) extract
the stem bushing (39). Install new bushing.
22. Grasp stem (6) with hand and from below
the lower case (2) push the stem up thru the
attachment hub (4) until the bottom end of
the stem aligns with the “C” close mark on
the indicator plate (23).
23. Reposition diaphragm washer (14) “o-ring
side up” and new o-ring (15) on top of at-
tachment hub (4).
24. Place the diaphragm plate (8) inside the
diaphragm (7) and carefully place both on
the diaphragm washer (14). Align bolt holes
in diaphragm with holes in lower case.
25. Align the spring plate (9) and stem spacer (5)
over the center hole of the diaphragm plate
(8).
26. Apply Loc-tite #242 to stem bolt (12) threads
and insert down through stacked parts and
rotate CW to engage threaded end of stem
(6). Tighten stem bolt (12) to actuator stem
(6) with 35 ft-lbs. torque.
27. Place springs (10) equally spaced around
the spring plate (9). See Step 15 previous
for matchmarks.