IOM-ALR-1
6
1. 16 rms finish on bore.
2. Max 0.015 inch (0.38 mm) clearance
be tween valve plug (20) spindle and
lower guide bushing (24).
d. Internal sensing drilled plug (33);
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
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 guide bearing (13).
NOTE:
A very slight amount of fluid and
elas tomer compatible lu bri cant is
rec om mend ed as an in stal la tion aid.
2.
Position guide bearing (13) over upper
end of cage (19) properly oriented.
Using thumbs, evenly press guide
bearing (13) into the cage (19), en-
suring not to “cut” o-ring seal (27.4).
Continue pressing guide bearing (13)
until in ap prox i mate final position.
b. Type
CW:
1. Stretch o-ring energizer/seal (27.2)
over low er cir cum fer ence of guide
bear ing (13), tak ing care not to “cut”
o-ring energizer/seal (27.2). Using
thumbs, work the o-ring en er giz er/
seal up and into the groove of the
bear ing (13).
NOTE:
A very slight
amount of fluid and elas tomer com-
patible lu bri cant is rec om mend ed as
an in stal la tion aid.
2. Place wiper washer (17.1) into “cup”
of Wiper Seal (16). Holding these
parts (17.1 & 16) between thumb and
forefinger, in sert into cage (19) at an
approximate 45° angled approach
with wiper washer (17.1) on bottom,
wiper seal (16) on top with turned-
down lip of wiper seal (16) en ter ing
cage (19) first. Rotate wiper seal (16)
and wiper washer (17.1) to a level
po si tion approximately half way down
into cage (19). Allow wiper washer
(17.1) to rest on bottom of cage (19).
3. Position TFE cap seal (27.1) ring with
rectangular cross-section at end of
guide bearing (13). Stretch cap seal
(27.1) over lower end of guide bear-
ing (13) using thumbs to work the
cap seal (27.1) onto the bearing (13).
DO NOT USE A TOOL FOR THIS
STEP. Con tin ue pressing cap seal
(27.1) up wards towards the groove
until the cap seal (27.1) “snaps” into
the groove of the guide bearing (13).
4. Position 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
guide bushing (13) into the cage (19),
simultaneously use fin gers to lightly
Figure 4:
Temporary Assembly Parts
Not supplied. Use any
bolt, washers (2) and
nut of same approximate
hole size.
17
19
16
13
(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 guide bear ing (13),
