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Disassembly - Emerson 1051 Instruction Manual

Sizes 40, 60 and 70 styles h and j rotary actuators
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1051 & 1052 H & J

Disassembly

The following procedure describes how the actuator
can be completely disassembled. When inspection
or repairs are required, perform only those steps
necessary to accomplish the procedure. Do not
under ordinary circumstances remove the cap
screws (keys 7, 8, and 21).
CAUTION
Cap screw (key 18) must be
disengaged from the lever (key 27)
before removing the diaphragm casing
(key 1). Failure to do so will allow the
spring precompression to rotate the
valve body or other operated
equipment beyond its fully open or
closed position. This could cause
damage to the operated equipment.
1. Bypass the valve or other operated equipment.
Relieve all actuator loading pressure, and remove
the tubing or pipe from the top of the actuator.
2. Remove the positioner, if one is used.
3. Mark the orientation of the travel indicator
(key 37) with respect to the travel indicator scale
(key 35). Then, unscrew the cap screws and
washers (keys 34 and 63), and remove the cover
(key 33).
4. Remove the retaining ring (key 30), and then
remove the hub (key 29) from the cover.
5. Check the condition of the bearing (key 31). If
replacement of the bearing is necessary, the travel
indicator scale (key 35) must first be removed by
removing the self-tapping screws (key 36). Mark the
orientation of the travel indicator scale on the cover
before removing it.
CAUTION
When removing the actuator from the
valve body, do not use a hammer or
similar tool to drive the lever (key 27)
or actuator off the output shaft
(key 87). Driving the lever or actuator
could damage operated equipment.
For valves, driving the lever (key 27)
could move the valve disc and
bearings away from the centered
position causing subsequent damage
to valve parts.
14
If necessary, use a wheel puller to
remove the lever. It is permissible to
tap the wheel puller screw lightly to
loosen the lever, but hitting the screw
with excessive force could also
damage operated parts or disrupt the
centered position of a valve disc or
other equipment.
6. For an actuator with an H mounting adaptation
and a 22.2 through 38.1 mm (7/8 through 1-1/2 inch)
output shaft, unscrew the cap screws (key 78) and
remove the actuator from the operated equipment.
Mark the orientation of the lever (key 27) with
respect to the output shaft (key 87). This marking is
used during reassembly to allow for proper
lever/output shaft positioning.
Then, loosen the cap screw (key 28) so that the
output shaft is free to slide off the lever. With the
lever and output shaft properly marked, unscrew the
cap screws (key 23) and remove the mounting plate
(key 22) and output shaft (key 87) assembly from the
actuator housing (key 20). If necessary, remove the
retaining ring (key 88) and separate the output shaft
from the mounting plate.
7. For an actuator with a J mounting adaptation (see
figures 12 and 13) with a 50.8 mm (2-inch) output
shaft (see figure 14) and proceed as follows:
a. Remove the cap screws (key 78, not shown in
figures 12 and 13) and remove the actuator from
the operated equipment. For an actuator with J
mounting and a 31.8 or 38.1 mm (1-1/4 or 1-1/2
inch) valve shaft diameter, two spacers (key 92,
not shown in figures 12 and 13) are also removed
with the cap screws (key 78).
b. When separating the output shaft (key 87) and
coupling (key 90) from the operated shaft,
remember to remove the woodruff key (key 91,
not shown in figure 14) from the operated shaft
keyway.
c. Mark the orientation of the lever (key 27,
figures 12 and 13) with respect to the output shaft
(key 87). This marking is used during reassembly
to allow for proper lever/output shaft positioning,
d. Loosen the cap screw (key 28, figures 12
and 13) so that the output shaft is free to slide off
the lever.
e. With the lever and output shaft properly
marked, unscrew the cap screws (key 23) and
remove either the mounting bracket (key 22,
figures 12 and 13 for J mounting) or the mounting
plate (key 22, figure 14 for H mounting) plus the
Instruction Manual
Form 5587
November 2006

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