Cashco 123-1+6+S - Manual (Page 3)

IOM-123-1+6 +S DIFF 3
B. Disassembly:
1. Securely install the body (1) in a vise with the
spring chamber (2) directed upwards.
2. Remove closing cap (22).
3. Loosen sealing locknut (9) by rotating CCW.
Relax range spring (18) by turning adjusting
screw (17) CCW.
4. Draw or em bed a match mark be tween body
(1) casting and spring chamber (2) sub as -
sem bly along fl anged area.
5. Re move all body flange hardware
(7,8,30,41,42).
6. Re move spring chamber (2) and connected
parts, range spring (18) and spring but ton
(19).
DO NOT AT TEMPT TO REMOVE ADJUSTING SCREW
(6) FROM TOP OF SPRING CHAM BER (2). The ad-
just ing screw (6) is threaded up from inside the spring
chamber (2) and the CCW rotation used to relieve
range spring (14) tension will come to a stop. At the
stop ping point, do not apply any torque to ad just ing
screw (6) or dam age may occur and ren der the unit
in op er a ble. See Figure 1.
CAUTION C
7. Adjusting screw (17) o-ring inspection:
a. With locknut (9) and closing cap (22) re-
moved, turn adjusting screw (17) CW as
far as possible by grasping the fl ats on
top end. Care ful ly reach in side spring
cham ber (2) and grasp ad just ing screw
(17) by hand. Remove ad just ing screw
(17) by rotating CCW. See Fig ure 1A.
b. Inspect the backup ring (28) and quad ring
(29) for wear. If nicked or torn - replace.
NOTE: Make certain the tefl on backup
ring (28) will insert into spring cham ber (2)
fi rst, before the quad ring (29). (See Fig-
ure 7 blow-up illustration). Make sure the
quad ring (29) is on straight with no twist.
Use a good grade light weight grease on
the ring seals (28,29).
c. Lubricate adjusting screw (17) threads.
Carefully re in stall adjusting screw (17) up
into the spring cham ber (2) by ro tat ing
adjusting screw (17) CW until top of
ad just ing screw (17) protrudes from top
of spring chamber (2) (See Fig ure 1B.).
NOTE: Care should be taken when hold-
ing and ro tat ing adjusting screw (6) so the
quad ring (29) and back up ring (28) are
not in ad vert ent ly nicked or torn. Grasp
top of ad just ing screw (17) and turn CCW
until rotation stops (see CAUTION C).
d. Loosely install the lock nut (9) and closing
cap (22).
8. Lift up and remove the diaphragm sub as -
sem bly con sist ing of the pis ton (14), piston
nut (6), di a phragm (3), di a phragm cov ers (24)
(NACE unit only, Cashco Dwg. 32934), pres-
sure plate (20), pusher plate (21), seal ing
washer (27), pres sure plate o-ring (31) and
pusher plate o-ring (34). Re move the fl ange
o-ring (32).
9. Loosen piston nut (6) and separate all parts
(3,24 (NACE units only),14,20,21,27,31,34)
of the diaphragm (3) sub as sem bly.
Figure 1: Adjusting screw (17) o-ring inspection.
9
28
29
28
29
9
17 17
2
B. Reassembly A. Removal
2
When body fl ange hardware (7,8,30,41,42) is re moved
from this unit it should al ways be re placed with new.
The new hardware (7,8,30,41,42) must have the prop er
grade spec i fi ca tion iden ti fi ca tion mark ings and meet
the following stan dards:
1. All cap screws (7,30) and fl ange stud nuts (8)
must have "heavy hex heads".
2. All studs (41,42) and cap screws (7,30) must
comply with or exceed the requirements of
ASTM-A-193, Grade B7.
3. All fl ange stud nuts (8) must comply with
or exceed the requirements of ASTM A-194,
Grade 2H.
New body fl ange hardware (7,8,30,41,42) may be pur-
chased from Cashco, Inc. or through the OEM.
CAUTION D