Assembly - Emerson 1051 Instruction Manual

1051 & 1052 H & J
(key 13 and 73) are to be replaced, unscrew the
lower bearing seat from the adjustor, and then
remove the thrust bearing and the bearing races
(keys 71 and 72) from the lower bearing seat.
D For actuator designs with a set screw
(key 75), remove the actuator spring (key 11) from
the actuator. If the spring seat and the lower bearing
seat (keys 13 and 73) are to be replaced, unscrew
the lower bearing seat from the adjustor, and then
remove the thrust bearing and the bearing races
(keys 71 and 72) from the lower bearing seat. If it is
necessary to remove the spring adjustment parts,
heat the set screw (key 75) to 177_C (350_F) long
enough for the thread-locking adhesive (high
strength) (key 77) to lose its holding strength, and
then loosen the set screw (key 75). Unscrew the
spring adjustor (key 74) from the spring barrel
(key 12).

Assembly

This procedure assumes that the actuator is
completely disassembled. If the actuator is not
completely disassembled, start these instructions at
the appropriate step. Key numbers used are shown
in figure 12 to Type 1051 actuators and in figure 13
for Type 1052 actuators.
1. If the Type 1052 spring barrel (key 12) was
removed from the housing (key 10), align the spring
barrel to the housing as described below to ensure
that the offset hole in the base of the spring barrel is
located properly.
For size 40 and 60 actuators, note that one of the
accessory mounting bosses on the spring barrel is
closer to the diaphragm end of the spring barrel.
Place the spring barrel on the housing with the upper
boss (the one closer to the diaphragm end) on the
same side as the boss located on the housing (see
figure 13). This ensures proper positioning of the
offset hole. Secure the spring barrel with the cap
screws (key 21).
For size 70 actuators, the spring barrel need not be
aligned in any particular position when placing it on
the housing.
Refer to table 10 for bolting torques for
actuator bolts and cap screws.
Exceeding any torque requirement
may impair the safe operation of the
actuator.
16
Note
2. Proceed as appropriate:
For Type 1051 actuators,
a. Coat the thread of the cap screw (key 9) and
the tapered end of the diaphragm rod (key 10)
with lithium grease (key 76).
b. Assemble the diaphragm rod, spring seat
(key 13), spring (key 11), and diaphragm plate
(key 4), and secure with the cap screw (key 9).
Tightening the cap screw will compress the
spring. Be certain the tapered end of the
diaphragm rod is seated in the corresponding
hole in the diaphragm plate, that the spring is
seated in the spring seat, and that the cap screw
is tightened to the torque specified in table 10.
c. Install the hex nut (key 58), turnbuckle
(key 57), hex nut (key 16), and rod end bearing
(key 17) onto the diaphragm rod.
d. Be certain the travel stops (key 8) are located
as shown in figure 11.
e. Install the diaphragm plate and attached parts
into the actuator.
f. Be sure the warning nameplate (key 56) is in
place. Install the diaphragm (key 3) and the upper
diaphragm casing (key 1). Install the cap screws
and hex nuts (keys 5 and 6). Tighten the cap
screws evenly in a crisscross pattern to compress
the spring and secure the upper diaphragm
casing. Tighten these cap screws to the torques
shown in table 10.
For Type 1052 actuators,
a. Proceed as appropriate:
D For actuator designs without a set screw in
the spring barrel (key 12), if the adjustor and
attached parts were removed, first clean and then
lubricate the upper threads of the adjustor (key 74)
with lithium grease (key 76) as shown in figure 13.
Install the lower bearing seat (key 73), the thrust
bearing (key 71), the thrust bearing races (key 72),
and the spring seat (key 13) onto the adjustor. Then,
first clean and then coat the lower end of the
adjustor with thread-locking adhesive (high strength)
(key 77) as shown in figure 13, and install the entire
assembly into the spring barrel (key 12). Let the
adjustor stand undisturbed for at least two hours
after installation to allow the thread-locking
compound to cure.
CAUTION
When applying lubricant to the upper
threads and thread-locking compound
Instruction Manual
Form 5587
November 2006