Cashco 345 - Manual (Page 3)

IOM-345 3
SPRING UNDER COMPRESSION. Prior to re mov ing
spring chamber, relieve spring com pres sion by back ing
out the T-bar adjusting screw. Failure to do so may result
in fl ying parts that could cause per sonal injury.
2. Relax range spring (14) by turning T-bar ad just ing
screw handle (6) CCW to release spring compres-
sion.
3. Grasp hexagon portion (w/proper wrench) of the
spring chamber (2) and turn CCW to re move.
4. Remove the thrust bearing (9), range spring (14),
and spring button (4).
5. Pull the pressure piston (3) directly out of the body.
Inspect the body quad ring (11) and body back up
ring (12). If nicked or scratched, re place. Apply
a light coating of lubricant to body quad ring (11)
when replacing.
6. Inspect pressure piston (3) to assure no de for -
ma tion due to over-pressurization. If deformed,
replace.
VI. MAINTENANCE:
A. General:
1. Maintenance procedures hereinafter are based
upon removal of the regulator unit from the pipe line
where installed.
2. Owner should refer to owner's procedures for
removal, handling, cleaning and disposal of non-
reuseable parts, i.e. gaskets, etc.
3. Refer to Figure 1 for the basic regu la tor, metal seat
design and Figure 2 for a blow-up of the balanced
TFE trim.
B. Pressure Piston/O-Ring: Inspection/ Re place ment:
1. Securely install the body (1) in a vise with the spring
chamber (2) directed upwards.
SECTION VI
NOTE: Never replace the socket head cap screws
(21) with just any bolting. Use only the proper size
and grade as replacement.
SYSTEM UNDER PRESSURE. Prior to per form ing any
maintenance, isolate the regulator from the system and
relieve all pressure. Fail ure to do so could result in per-
sonal injury.
WARNING
WARNING
Regulator Size Cap Screw Size Torque
1/2", 3/4" & 1"
(DN15, 20, 25) 3/8"-16-1"
skthd cap screw 50 ft./lbs.
(68 N-m)
7. Reverse steps 1 through 5 for reassembly. Make
sure spring chamber (2) is tightened fully down
against body (1).
C. Trim Replacement (For Metal Seated Units):
1. Install body (1) in a vise with the body cap (5) on
top.
2. Using a 5/16" Allen wrench, re move socket head
cap screws (21). Carefully remove body cap from
body.
3. Remove piston spring (17), piston (15 or 15.1),
cylinder (16 or 15.2) and cylinder gasket (18). In-
spect parts for excessive wear, especially at seat
surfaces. Replace if worn, nicked, or depressed.
4. Remove body cap o-ring (13) and clean con tact ing
surface of body. Clean fl at mating sur faces of body
(1) to body cap (5) shoulder.
5. Clean debris from within regulator body (1) cav i ty.
Clean parts to be reused. NOTE: On regulators
originally supplied as "oxygen clean", option 345-
55, maintenance must in clude a level of clean li ness
equal to Cashco's cleaning stan dard #S-1134.
Contact factory for details.
6. Replace cylinder gasket (18) on cylinder (16 or
15.2)
7. Reinstall the cylinder (16 or 15.2) and cylinder
gasket (18) into body cavity.
8. Slide the piston (15.1) slowly into place, as sur ing
that the piston (15.1) post slides into the pressure
piston (3).
9. Carefully place piston spring (17) directly on top of
the piston (15.1).
10. Install body cap o-ring (13) on body cap (5) and
carefully place body cap (5) into body (1). Re place
socket head cap screws (21) and tighten with a
5/16" Allen wrench. Rec om mended torque is as
fol lows: