Cashco 31-B - Manual (Page 7)

IOM-31-B 7
BODY SIZES 1/2", 3/4" & 1" (DN15, 20 & 25)
BODY SIZES 1-1/2" & 2" (DN40 & 50)
Figure 4
snuggly”. Re peat until load ing ring is prop er ly
located per Figure 4. The “split” of loading ring
(25) is factory as sem bled along the body axial
centerline for body sizes 1.2" - 1" (DN15 - 25),
and for loading ring (33) at the 21° mark on the
body (1) for body sizes 1-1/2" and 2" (DN40
& 50).
13. Place gasket (8) into recess in top of body (1).
14. Using the match mark from Step 3 previous,
align the marks of the (UA), the retainer fl ange
(2) and the body (1). Insert two cap screws
(11) and fi nger tighten in an al ter nat ing cross
pattern.
15. Wrench tighten cap screws (11) in an al ter-
nat ing cross pattern. Torque to 8–10 ft.-#
(10.8–13.5N-M).
D. Linkage Lever and Stem Replacement:
1. Remove diaphragm sub-assembly (DSA) as
de scribed in Section VI.B., Steps 1 thru 7.
2. Remove lower case (3) from body (1) as
de scribed in Section VI.C., Steps 1 thru 6.
3. Rotate both machine screws (22) CCW to
remove washers (37). Lift link age lever (21)
upwards from its position of en gage ment in the
slot in stem (24) to remove pivot pin spacers
(40), link age pivot pin (23) and linkage spacers
(39). (See Figure 8.) Inspect parts for wear,
bend ing, etc. Replace worn parts.
4. Withdraw stem (24) through the neck of the
lower case. Inspect stem to assure that there
is no bend ing in the "slot" area where the stem
and linkage lever (21) engage. Replace stem if
there are any signs of bending or friction in the
stem guiding or engagement zones. NOTE:
If regulator has external sensing - replace the
o-ring (44).
5. Reinstall the seat (27) on the stem (24) as
described in Section VI.C. Step 7.
6. Insert stem (24), notched end fi rst, into lower
case through hole in neck of lower case.
Ensure that the notch in the stem is vertical.
7. Insert machine screws (22) through fl at wash-
ers (37) and holes in spacers (39), grooved
area of spacers must be oriented up and facing
each other. Engage screw threads with holes
in lower case. DO NOT TIGHTEN at this time.
8. Insert linkage pivot pin (23) thru hole in link-
age lever (21). Install pivot pin spacers (40)
on pivot pin, one on each side of the lever.
Simultaneously engage the circular key of the
linkage lever (21) through notch in the stem
(24). Place the pin (23) ends under the fl at
washers and into the grooved area of each
spacer. Align parts so that stem will move
freely back and forth when the lever moves
up and down. Tighten both machine screws
(22) to 80 in. / oz torque.
9. Reinstall diaphragm sub-assembly (DSA) and
upper case (4) as described in Section VI.B.,
Steps 11 thru 23.
10. Reinstall upper assembly (UA) to body (1) as
de scribed in Section VI.C., Steps 12 - 15.
E. Range Spring Replacement:
1. Remove closing cap (5) from spring chamber
(4).