IOM-48
16
bearing (18), bearing
fl
anges (19) and cover
plate (20) removed) prop er ly ori ent ed and shift
lat er al ly over the pro trud ing stem (Rang er (7),
Premier (3.2)). Bring the round opening of
the arm housing (4) into position against the
mounting yoke (12). Raise/lower/tip/rotate the
actuator assembly (AA) to align at least one
bolt hole of the yoke (12) with one bolt hole
in the arm housing (4). Insert one cap screw
(24) from behind the yoke's (12) bolt hole and
engage with the tapped opening in the arm
housing (4);
fi
nger tighten cap screw (24).
4. Reposition actuator assembly (AA) as re quired
to align the remaining bolt holes se cur ing
yoke (12) with arm housing (4). In sert the cap
screws (24) and
fi
nger-tighten.
5. (Wrench-tighten in one-half revolution in cre -
ments and in an alternating cross-pattern
the three cap screws (24) securing actuator
as sem bly (AA) to body assembly (BA). Final
tightening should be by torque wrench to 17-
20 ft-lbs (23-27 N-m)
6A. For units (AA, BA) with Model 73N-B P/P
positioner:
a. Secure characterization cam (12) prop er ly
oriented over the two rolled spring pins
(50) stuck into the inner lever arm (5).
b. Place the outer lever arm (5) over the
two spring pins (50) with the bolt holes
align ing. Press the apparatus (5,50,50,5)
to geth er.
6B. For Units (AA, BA) with no positioner, Model
9540R P/P positioner or 991 or PS2 I/P:
a. Similar to 6A. above, except a spacer
wash er (12) replaces the cam (12) of a
Model 73N-B P/P positioner.
7. Position valve plug (Ranger (6)) / disc (Pre mier
(3.1) in the proper “Full Closed” or “Full Open”
position.
NOT FOLLOWING THIS ARTICLE
WILL CAUSE ME CHAN I CAL DAMAGE TO
THE UNIT’S (AA, BA) LINKAGE MECH A-
NISM!
8. Place properly oriented lever arm ap pa ra tus
(5,50,12,50,5) over shaft’s (Ranger (7), Pre-
mier (3.2)) square end and push into place
while holding lower L.H. rod end (9) “swung”
aside so as to not interfere.
NOTE:
For units
(AA, BA) with 73N-B P/P positioner, it will be
nec es sary to “swing” the feedback linkage
subassembly ((72)) out of the way as the
lever arm apparatus (5,50,12,50,5) is pushed
into place.
Center-align lever arm apparatus
(5,50,12,50,5) transversely within the arm
housing (4), directly over stop screw (35).
9A. For units (AA, BA) with Model 73N-B P/P po-
sitioner: Place indicator spacer (17) over end
of shaft (Ranger (7), Premier (3.2)) prop er ly
oriented for travel indicator (16) to be “located”
by spring pin (51).
9B. For units (AA, BA) with Model 9540R P/P
positioner or 991 or PS2 I/P positioner: Ref-
erence the IOM-9540R or 991/PS2 IOM for
proper instructions on reinstallation of in di ca tor
spacer (17) and drive coupling ((32)).
10. Align the bolt holes in lever arms (5) and lower
L.H. rod end (9).
NOTE:
For units (AA, BA)
with ATO-FC action it will be necessary to
offset “stem windup” by –
a. Rotating manual handwheel operator
(MHWO) handwheel (58.1) ap prox i mate ly
1-3 rev o lu tions CW (viewed from above
handwheel) until the bolt holes of lever
arms (5) and lower L.H. rod end (9) are
aligned.
b. Pressurize actuator casing (1) only until
the bolt holes of the lever arms (5) and
the lower L.H. rod end (9) align.
11. Insert shoulder bolt (40) through the round
opening of the arm housing (4) and into the
bolt holes of lever arms (5) and lower L.H. rod
end (9).
12. Ensure that lever arm apparatus (5,50,12,50,5)
is transversely centered within the arm hous-
ing (4). Engage lock nut (46) together with
shoulder bolt. Wrench-tighten to a torque of
15-20 ft-lbs (20-27 N-m).
13. Position
bearing
fl
anges (19) with retainer ball
bearing (18) over the spacer (17). Align the
bearing
fl
anges' (19) bolt holes with the arm
housing (4) bolt holes.
14A. Units (AA, BA) with Model 73N-B or without
postioner:
a. Insert rolled spring pin (51) into indicator
spacer (17). Pin (51) will protrude ap-
prox i mate ly 1/16" (1.5 mm).
b. Position travel indicator (16) onto end of
shaft (Ranger (7), Premier (3.2)) impaling
over pro trud ing spring pin (51) and align ing
with shaft-end tapped opening with hole
in travel in di ca tor (16). Align lock-tooth
washer (55) on spacer (17) and secure
