Cashco HP-1+6+S - Manual (Page 4)

IOM-HP-S-DIFF 4
c. Lubricate adjusting screw (6) threads.
Carefully re in stall the adjusting screw (6)
up into the spring cham ber (2) by ro tat ing
the ad just ing screw (6) CW until top of
adjusting screw (6) protrudes from top of
spring chamber (2). NOTE: Care should
be taken when hold ing and ro tat ing the
ad just ing screw (6) so the quad ring (31)
and back up ring (32) are not in ad vert ent ly
nicked or torn. Grasp top of ad just ing
screw (6) and turn CCW until ro ta tion
stops (see CAUTION C). See Fig ure 1.
d. Loosely install lock nut (7) and closing cap
(28).
7. In spect pressure plate (3) for defects due to
over-pres sur iza tion. Replace if de fec tive.
8. Clean all parts to be re-used according to
owner's procedures.
9. Place fi rst o-ring (30) on body (1) and lu bri-
cate with a lightweight multi-purpose grease.
Po si tion body spacer (24) on body with match
marks aligned. Place pusher plate (11) on
body spac er (24) and check for ver ti cal move-
ment. NOTE: The vertical move ment should
be free and unobstructed as the push er plate
(11) is pushed down and the lower piston
spring (17) contracts and ex pands. If move-
ment is not free, go to Sub sec tion C following
to inspect the inner trim parts.
10. Place second o-ring (30) on body spacer (24)
and lubricate with lightweight multi-purpose
grease. Po si tion diaphragm (12) on body
spac er (24) in side of o-ring (30).
11. Visually center the pressure plate (3) on
di a phragm (12). Place range spring (14) onto
re tain er hub of pressure plate (3).
12. Place multi-purpose, high temperature grease
into depression of spring button (4) where ad-
justing screw (6) bears. Set spring but ton (4)
onto range spring (14); ensure spring button
(4) is laying fl at.
13. Using "NEW" studs (34,35) and nuts (9) (see
CAUTION D), thread a nut onto each stud
approximately 1.25" (32 mm). Drop the studs
(34,35) with nuts (9) through the holes in
spring chamber (2). (This will assist in keep-
ing the spring chamber (2) centered on body
(1) and prevent parts from moving dur ing re-
assembly).
Using the "match marks" made in Step 3 as a
guide, replace spring chamber (2) onto body
spacer (24). Thread on lower nuts (9) and
tighten by hand. Adjust length of studs (34,35)
by using the top nut (9) so that there are at least
3 to 4 threads protruding from the lower nut.
Torque body fl ange hardware (9,23,34,35)
using small increments in a 180° al ter nat ing
pattern until fl ange mating sur fac es of body (1),
body spacer (24) and spring chamber (2) are
metal to metal. This creates a "fi xed compres-
sion" on the di a phragm (12) and o-ring (30)
seals. Rec om mend ed torque val ues are listed
in Table 1.
TABLE 1
Body Size
in. (DN)
Item
No.
Thread
Size
Torque Values
Ft-lbs (N-m)
1/2"-1" (15-25) 9,23,34 3/8"-24 35-40 (47-54)
1-1/2" (40) 9,23,34,35 7/16"-20 55-60 (75-81)
14. With locknut (7) tight against closing cap (28),
turn closing cap (28) CW until tension is ap-
plied to range spring (14).
15. Proceed to Section D. for bench test.
C. Trim Replacement:
NOTE: Do not release tension on range
spring (14). (Only necessary when removing
spring cham ber). The range spring (14) ten-
sion keeps pusher plate (11) in alignment and
as sures proper fi t upon replacement of trim.
1. Install body (1) in a vise with the body cap (5)
on top and spring chamber (2) downwards.
2. Loosen and remove body cap (5). NOTE:
Pis ton spring (17) may stick in body cap (5)
when removing.
3. Remove piston spring (17), piston (15) and
cylinder (16). Inspect parts for ex ces sive wear,
espe cially at piston (15) seat surface. En sure
there are no nicks or foreign particles em-
bed ded in the piston (15) TFE seat. Re place
piston w/ TFE seat (15) if necessary. In spect
the back up ring (27) and quad ring (26) on
piston (15). Re place rings if worn, nicked, or
de pressed.
4. Remove body cap O-ring (25). Clean con tact-
ing surfaces of body (1) and body cap (5). Be
care ful not to scratch either surface. In spect
inside sur face of the body cap for scratch es or
nicks. These could result in leak age past the
quad ring (26) and backup ring (27). If worn or
scratched replace body cap (5).