Cashco 964 - Manual (Page 6)

IOM-964 6
5. For ATC-FO: Connect a temporary air supply
hose that has an ad just able airset with gauge
to the ac tu a tor inlet to allow pres sur iza tion.
Slowly pressurize actuator to bring the ac tu a tor
stem (6) to with in 1/8" (3 mm) of reaching the
plug/stem (3).
6. With hand lift plug/stem (3) up to touch ac tu a tor
stem (6). Rotate plug/stem (3) CCW (viewed
from above) to en gage with ac tu a tor stem (6).
Use the total number of revs en gage ment
recorded in Step V.B. as the guide to control
engagement of the stems (6) (3). While en-
gag ing, rotate yoke nut (29) as able to help
stabilize top works, continue to pres sur ize the
ac tu a tor in 2-3 psi (.15-.20 Bar) in cre ments
in an al ter nat ing se quence with the distance
en gaged until the total num ber of revs engaged
is reached.
7. Hand-tighten yoke nut (29) until fully po si tioned
with the yoke (3) sitting on the bonnet (2).
8. Secure “dangling parts” - ac ces so ry plate
((AP)) and indicating washer (26) - to ac tu a tor
stem (6) with stem jam nuts (18).
9. Ham mer rap yoke nut (29) until tight. (Release
tem po rary air source.)
D. Trim Removal and Re place ment:
1. Secure body (1) assembly (BA) in a vise with
actuator assembly (AA) di rect ed up wards.
Place match marks be tween the body (1) and
the bonnet (2).
2. Secure the actuator assembly (AA) with an
over head support capable of ver ti cal lift.
3. (Note PA.) Loosen all bonnet stud nuts (17)
(four nuts for 1/2" thru 1-1/2" sizes; six nuts
for 2" size).
4. Ensure actuator support is “taut”; i.e. hold ing
weight of actuator.
5. Remove all bonnet bolting nuts (17).
6. Lift the actuator assembly (AA), to geth er with
bon net (2) and stem as sem bly (3) vertically
out of the valve body (1). Lay the topworks
assembly down onto a work bench horizontally.
For 1/2" - 1-1/2" sizes, re move the cage (10)
and seat ring (11) from the body (1) cavity.
7. From the top works as sem bly, loosen the stem
jam nuts (18) by rotating CCW (viewed from
plug end) while se cur ing the actuator stem
(6) with soft-jawed pliers.
8. Loosen stem packing (6) by turn ing nuts (15)
CCW to a point just short of dis en gage ment
from the threads.
9. While securing the actuator stem (6) by soft-
jawed pliers, rotate the valve stem as sem bly
(3) CCW (viewed from plug end). Record the
number of rev o lu tions of dis en gage ment in
the box below:
Number of revolutions to disengage plug/stem as-
sembly from actuator stem.
CAUTION
Take extreme care to not mar internal wall surface of the
bonnet (2).
10. Remove packing fl ange nuts (15) with CCW
ro ta tion.
11. Partially withdraw plug/stem as sem bly (3).
Re move position in di ca ting washer (26), both
jam nuts (18), packing fl ange (4), pack ing
follower (5), and ac ces so ry plate ((AP)), if
installed.
12. Fully withdraw stem/plug as sem bly (3). For
1/2" thru 1-1/2" sizes, cage (10) may have
come loose see Step 6 above.
13. Using a sharp, hooked-end, pick-type tool,
hook and pull the packing rings (6) up and out
of the bonnet’s (2) packing bore individually.
Discard old packing (6).
14. Using a sharp pointed tool, remove packing
washer (23) and packing spring (24).
15. Solvent clean all loose parts with suitable
solvent and let dry.
16. For SIZES 1/2” thru 1-1/2", inspect guide
bushing (8) in-place, as the bushing (8) is
press fi t into the bonnet (2). If worn badly
or “scored”:
a. Remove bonnet (2) by removing yoke
nut (29).
b. Hydraulically press guide bushing (8)
“out” of bonnet (2); press “in” new
guide bushing (8).
c. Reinstall bonnet (2) back thru yoke (3),
and secure with yoke nut (29).