Cashco DA4 - Manual (Page 7)

IOM-DA4 7
1. Ensure that bore is minimum 0.125
inch (3.20 mm). Drill out as required.
4. Staging Material for Reassembly.
a. Inspect and clean parts, as necessary,
from the spare parts kit. (See Article VII
.A.4. comments concerning cleaning for
ox y gen service.)
b. Lay out all the regulator parts and check
against the bill of material.
E. Reassembly of the ITA:
1. When replacing the optional wiper seal (16),
the replacement wiper seal (16) is “pre-
formed”. It may, however, require reforming.
Under normal circumstances, this step may
not be required. If needed, reform the wiper
seal (16) by press ing the temporary assembly
parts into the cage (19) backwards as shown
in Figure 4. The wiper seal (16) is best left in
this position overnight (minimum of two (2)
hours) prior to re as sem bly.
2. After forming the wiper seal, remove parts
(13, 16, 17) from cage (19) and disassemble
the tem po rary assembly of Step 1. above.
3. Installation of dynamic side seal (27) (See
Figure 1):
a. Type
OR:
1. Stretch o-ring seal (27.4) over lower
cir cum fer ence of piston-guide bear ing
(13), tak ing care not to “cut” o-ring
seal (27.4). Using thumbs, work the
o-ring seal (27.4) up and into the
groove of the piston-guide bearing
(13). NOTE: A very slight amount
of fl uid and elas tomer compatible
lu bri cant is rec om mend ed as an
in stal la tion aid.
2. For metal diaphragm construction,
insert cam ber adjusting washer (17.2)
into cage (19) and allow to rest in the
bottom of the cage (19).
3. Position piston-guide bearing (13)
over upper end of cage (19) prop-
erly oriented. Using thumbs, evenly
press piston-guide bearing (13) into
the cage (19), ensuring not to “cut”
o-ring seal (27.4). Continue pressing
pis ton-guide bearing (13) until in ap-
prox i mate fi nal position.
b. Type CP:
1. Stretch o-ring energizer/seal (27.2)
over low er cir cum fer ence of piston-
guide bear ing (13), tak ing care not to
“cut” o-ring energizer/seal (27.2). Us-
ing thumbs, work the o-ring en er giz er/
seal (27.2) up and into the groove of
Figure 4: Temporary Assembly Parts
bear ing (13). NOTE: A very slight
amount of fl uid and elas tomer com-
patible lu bri cant is rec om mend ed as
an in stal la tion aid.
2. For metal diaphragm construction, in-
sert cam ber adjusting washer (17.2)
into cage (19) and allow to rest in the
bottom of the cage (19).
3. Position TFE cap seal (27.1) ring with
rectangular cross-section at end of
pis ton-guide bearing (13). Stretch cap
seal (27.1) over lower end of piston-
guide bear ing (13) using thumbs to
work the cap seal (27.1) onto the pis-
ton-guide bearing (13). DO NOT USE
A TOOL FOR THIS STEP. Con tin ue
pressing cap seal (27.1) up wards to-
wards the groove until the cap seal
(27.1) “snaps” into the groove of the
piston-guide bearing (13).
4. Position piston-guide bearing (13)
over and into upper end of cage (19)
until the cap seal (27.1) edge touches
the upper lip of the cage (19). While
gently applying force to press the
piston-guide bushing (13) into the
cage (19), simultaneously use fi n gers
to lightly press the cap seal (27.1)
inwards into the groove of the pis ton-
guide bearing (13) until the cap seal
(27.1) “slips into” the cage (19). DO
NOT USE TOOLS, LU BRI CANT, OR
HEAVY FORCE TO EN GAGE THE
CAP SEAL (27.1) INTO THE CAGE
(19). Do not press in wards on the Cap
Seal (27.1) too much or the cap seal
(27.1) may slide out of its groove or
the cap seal (27.1) can be damaged.
Not supplied. Use any
bolt, washers (2) and
nut of same approximate
hole size.
17
19
16
13