Cashco 964 - Manual (Page 7)

IOM-964 7
17. For SIZE 2", inspect guide bush ing (8) in-
place, as the bush ing (8) is press fi t into the
bonnet (2). If worn or “scored:
a. Remove bonnet (2) by re mov ing yoke nut
(29).
b. Remove retaining ring (9).
c. Hydraulically press guide bush ing (8)
“out”; press “in” new guide bushing (8)
into bon net (2).
d. Replace retaining ring (9).
e. Reinstall bonnet (2) back to geth er with ac-
tu a tor yoke (3), securing with yoke nut (29).
18. Examine cage (10), seat ring (11), plug/stem
(3) seat insert (27), seat retainer (28) and
gasket (13) for wear. Re place all worn parts.
Refer to Figure 3 for correct orientation of
composition seat parts.
19. Examine stem (3) in critical fi nish zone where
contact is made with the packing (6). It is de-
sirable to restore the surface of the stem (3)
to a #8 Ra μ-in surface fi nish; metal removal
should not exceed 0.001-inch material. A
deeply scratched or pitted stem (3) should
be replaced.
20. Plug head of stem (3) assembly for metal
seated design may be hand lapped using
suitable lapping com pound. If hand lap ping
will not restore surface fi nish to an ac cept able
de gree, re place ment of stem (3) as sem bly
and seat ring (11) is rec om mend ed.
21. Examine the inner surface of the bonnet’s
(2) packing bore. It is desirable to restore
the surface of stuffi ng box to a #16 Ra μ-in
surface fi nish; metal removal should not ex-
ceed 0.001-inch material. If inner surface is
deeply scratched or pitted, bonnet (2) should
be replaced.
22. Examine packing follower (5) for corrosion.
Replace if signifi cantly corroded. Remove
follower bushing (25) from inside of packing
follower (5) and replace with new.
23. Remove gasket (12) (13), clean gas ket fac ing
sur fac es and replace with new gas ket (12) (13).
24. Place seat ring (11) [and cage (10) - for sizes
1/2" - 1-1/2"] into the body (1) cavity. Insert
the threaded end of stem (3) thru bonnet (2)
until it ap pears thru the top side. Place bon-
net on body. (NOTE: The cage for 2" size
is integral with bonnet (2).)
25. For SIZES 1/2" - 1-1/2", lower packing spring
(24) into bonnet (2) pack ing bore.
For SIZE 2", fi rst slide packing stop (7) into
bonnet (2) packing bore followed by the pack-
ing spring (24).
26. Lower packing washer (23) into bonnet (2)
packing bore. Ensure that wash er (23) is
rest ing fl at on the packing spring (24).
27. Carefully place lower adapter (6.3) of pack-
ing ring set (6) over stem’s (3) threaded end,
properly oriented. Using the packing follower
(5), push the lower adapter into the bonnet’s
(2) packing bore.
Packing Orientation
28. Carefully place a packing ring (6.2) properly
oriented over the stem’s (3) end and push
into the packing bore similar to the adapter
(6.3). Repeat process for balance of rings.
29. Carefully place upper adapter (6.1) over
threaded end of stem (3).
30. Slide packing follower (5) with new follower
bushing (25) over threaded end of stem.
31. Place packing fl ange (4) over end of stem
(3) and over packing studs (14). Install both
jam nuts (18) on stem and rotate to bottom
of stem threads.
32. Slide indicating washer(26) and accessory
plate ((AP)), if installed, over threaded end
of stem (3).
33. Engage plug/stem (3) into ac tu a tor stem
(6) per the same number of rev o lu tions
recorded per D. Step 9.
34. Rotate both jam nuts (18) up tight against
position in di ca ting washer (26).