Cashco 1000 HP Basic - Manual (Page 7)

7 IOM-1000HP-Basic
CYLINDER SUB-ASSEMBLY (21) WITH
PISTON (24) — METAL SEATED
CONSTRUCTION
5. Place cotter pin (15) through the slot/hole,
bend over ends.
6. Continue reassembly per Sub-Section B.
Di a phragm Replacement, Step 14.
E. Trim Removal and Replacement
1. Install body (1) horizontally in a vise with the
spring chamber (2) directed upwards, and the
body (1) held at the outlet end.
2. Use a box end wrench or socket, with a lever
length of at least 24 inches (600 mm), and
place it over the hex surfaces of the cylinder
(21). The wrench should be rapped with a
ham mer to loosen.
CAUTION
Take precaution to not allow the piston (24) to fall
from within the cylinder (21); tip cylinder with hex end
down.
3. Continue to unscrew cylinder (21) until re-
moved. The piston (24) and piston collar (23)
should come out by gravity with the cylinder
(21) removal.
4. If an Option 1000-17 piston spring (30) is uti-
lized, it also should be removed and re placed
at trim replacement.
5. Inspect inside surface of cylinder (21) at four
points:
a. Valve seat (21.2). Check for ero sion/
wear on seat ing surfaces. If wear is ex-
ces sive, con sider utilizing Option 1000-
15, stel lited seat sur faces.
b. Seat (21.2). Check for wire drawing
be tween cyl in der (21.1) and valve seat
(21.2) where pressed in. If wear exists
here, an Option 1000-14, integral seat,
should be utilized as a re place ment.
c. Flow induced wear at expansion zone
where fl uid turns to enter the piston (24)
center.
d. Where the piston (24) ribbed guides bear
(guide zone).
If wear is signifi cant at any of these points,
both cylinder sub-assembly (21) and piston
sub-assembly (24 or 24, 25 and 26) should
be replaced. (Cashco, Inc., does not rec om-
mend attempting to replace the valve seat
(21.2) by pressing out and then re-pressing
in. Cashco, Inc., also recom mends that a
cyl in der (21) and piston (24 or 24, 25 and 26)
be replaced as a set. Composition seat discs
(25) may be re placed individually.)
6. If a composition (soft) seat trim design is uti-
lized, use the following sub-steps:
a. Tighten the “fl ats” of the seat disc screw
(26) within a vise. Firmly hand-grip the
piston (24) and turn CCW to loosen the
seat disc screw (26). If too tight, place a
screwdriver or similar rod within the pis ton
(24) port holes and rotate. Remove the
piston (24), and inspect for raised burrs
around the port holes if a device is used
to loosen; deburr as re quired. NOTE: Do
not grip the piston (24) with a wrench.
b. Remove the seat disc (25) and clean the
re cessed piston (24) area where the seat
disc (25) is placed. If the edges which
form the recess of the piston (24) are
worn, also replace piston (24) and seat
disc screw (26).
c. Place seat disc (25) into recessed end of
piston (24).
d. Place thread sealant on threaded por tion
of seat disc screw (26), and manu ally ro-
tate piston (24) into seat disc screw (26)
(still fi xed in vise) to secure seat disc (25).
Tight en seat disc screw (26) fi rmly. Do
not over-tighten to the point of em bed ding