IOM-48
19
e. Loosen lower L.H. rod end (9) jam nut (44)
by rotating CW (viewed from above); this
nut (44) is “left-handed”. Back nut (44) to
the root of its threads on push rod (10).
f. Using a suitable tool to prevent lower L.H.
rod end (9) from rotating, rotate push rod
(10) CCW (viewed from above) until up per
end of push rod (10) is fully en gaged with
upper R.H. rod end (8).
NOTE:
If lower L.H.
rod end (9) reaches full en gage ment with
low er push rod (10) end
fi
rst, remove tool
se cur ing against ro ta tion, and allow lower
L.H. rod end (9) to rotate with push rod
(10)
. Once upper end of push rod (10) is
fully en gaged with upper R.H. rod end (8),
rotate lower L.H. rod end (9) CW (viewed
from above) until it is fully engaged.
g. Provide a temporary air supply with an
inline ad just able airset to the ac tu a tor
upper cas ing (1) connection.
h. Reference
the
name
plate (21) at tached
to the cover plate (20) that is fas tened to
the arm hous ing (4). De ter mine the bench
set ting from the name plate (21).
i. Pres
sur ize the ac tu a tor (AA) to the lower
val ue of the benchset range pres sure
in di cat ed on the name plate (21).
j. While
holding
low
er L.H. rod end (9) out
of way, lift lever arms (5) up as far as
pos si ble (this will close plug (Rang er (5))/
disc (Pre mier (3.1)).
k. Rotate lower L.H. rod end (9) as re quired
to orient the holes of the rod end (9) and
the lever arms (5) in the same plane.
Swing low er L.H. rod end (9) be tween
the lever arms (5).
l. Rotate the push rod (10) CW (viewed
from above) lowering the lower L.H. rod
end (9) until it’s hole is centered with the
lever arm (5) holes. Center lever arms (5)
with in arm housing’s (4) transverse axis;
i.e. center over trav el stop screw (35).
m. Reinstall the shoulder bolt (40) through
the lever arm (5) and lower L.H. rod end
(9) holes. Finger-tight en lock nut (46) onto
shoul der bolt (40). Using a 1/4" allen key
wrench to secure the head of shoul der
bolt (40), torque wrench-tighten nut (46)
to 15-20 ft-lbs (20-27 N-m).
n. Tighten lower L.H. jam nut (44) down until
locked against lower L.H. rod end (9); nut
(44) is “left-handed”.
o. Add approximately 6 psig (0.4 Barg) to the
actuator’s (AA) lower value of benchset
range. This will extend the actuator stem/
push rod sub-assembly (8, 9, 10, 43, 43,
43, 44, 54) downwards to al low loos en-
ing double jam nuts (43) on top side of
uptravel stop washer (54).
p. Release air pressure down to the lower
value of benchset range.
q. Rotate lower jam nut (43) to raise uptravel
stop wash ers (54) until the gap clearance
between the lower casing (2) and the
top side of the washer (54) is 1/8"±1/16"
(3mm±1.5mm).
r. Repressurize actuator (AA) to level as
indicated in Article 5.o. above. Tighten
the lower of the two upper jam nuts (43)
until it is tight, and secures the uptravel
stop washer (54). Tighten the upper of
the two upper jam nuts (43) down to
secure the double jam nut (43) locking
effect. Retighten lower jam nut (43) on
un der neath side of washer (54).
s. Release all air pressure from actuator
upper casing (1). Repressurize slowly to
con
fi
rm that as the pressure reaches the
lower value of the benchset range (see
Article 5.i. previous), the actuator stem/
push rod sub-assembly (8, 9, 10, 43, 43,
43, 44, 54) begins to move. If move ment
is prematurely occurring (i.e. move ment
at less than the lower benchset range
val ue), the length of the actuator stem
sub-as sem bly (8, 9, 10, 43, 43, 43, 44,
54) must be short ened. Re peat pro ce dure
from Article 5.a. through to this Ar ti cle. If
move ment is late (i.e. move ment at more
than the lower benchset range value), the
length of the actuator stem sub-assembly
(8,9,10,43,43,43,44,54) must be length-
ened (i.e. increased). Re peat procedure
from Article 5.a. through to this Article. It
is recommended that ad just ment of ac-
tu a tor stem sub-assembly (8, 9, 10, 43,
43, 43, 44, 54) be made in one rev o lu tion
of push rod (10) increments. Re peat as
nec es sary.
t. Slowly increase air pressure in upper cas-
ing (1) until reaching the higher value of
the benchset range; i.e. pres sur ize only
until plug (Ranger (5))/disc (Premier (3.1))
is in the full open position.
u. Release all air pressure in actuator upper
casing (1). Repeat Article 5.t above and
this article, cycling valve unit (AA, BA)
closed-open-closed-open-closed sev er al
times.
v. With valve plug (Ranger (5)) / disc (Pre mier
(3.1)) in “full closed” position, re in stall
bearing (18), bearing
fl
anges (19), cover-
plate (13), dial lens (14) and dial (15) with
three cap screws (31).
NOTE:
Position
