Emerson Fisher 1051 User manual

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Fisher™1051 and 1052 Size 33
Diaphragm Rotary Actuators
Contents
Introduction 1.................................
Scope of Manual 1.............................
Description 2.................................
Specifications 3...............................
Installation 3..................................
Actuator Mounting and Changing Actuator
Mounting 5................................
F and G Mounting Adaptations 5.............
H Mounting Adaptation 7...................
J Mounting Adaptation 8....................
1052 Spring Compression Adjustment 10.........
Initial Compression 10......................
Stroking Range 11.........................
Maintenance 11................................
Mounting Adaptations 12......................
Replacing Diaphragm 12.......................
Replacing Diaphragm Plate, Diaphragm Rod,
Spring, and Spring Seat 13....................
Changing Or Replacing Actuator Lever 16.........
Proximity Switches, Lever‐Operated Switches,
and Positioner 18...........................
Installing the Cam 18......................
Installing Proximity Switches 19..............
Switches Indicating Bottom of Stroke 19..
Switches Indicating Top of Stroke 19......
Installing Lever‐Operated Switch 19..........
Installing the Push Rod 20................
Figure 1. Fisher 1052 Actuator with CV500 Valve and
FIELDVUE™ DVC6200 Digital Valve Controller
W8192‐2
Mounting Lever‐Operated Switch and
Adjustment 20..........................
Positioner Mounting 20........................
Top‐Mounted Handwheel 20....................
Locking Mechanism 21.........................
Parts Ordering 23...............................
Parts Kits 23...................................
Parts List 23...................................
Introduction
Scope of Manual
This instruction manual includes installation, adjustment, operation, maintenance, and parts information for the
Fisher 1051 and 1052 Size 33 diaphragm rotary actuators (figure 1). Mounting adaptations F, G, H, and J are included
in this manual. Instructions for the control valve, positioner, manual actuator, and other accessories are included in
separate manuals.
Instruction Manual
D101322X012
1051 and 1052 Size 33 Actuators
June 2017

Instruction Manual
D101322X012
1051 and 1052 Size 33 Actuators
June 2017
2
Table 1. Specifications
Available Configuration
1051: For on‐off service without a positioner or for
throttling service with a positioner
1052: For on‐off service without a positioner or for
throttling service with or without a positioner
Standard Diaphragm Pressure Ranges
J0 to 1.2 bar (0 to 18 psig), J0 to 2.3 bar (0 to 33
psig), J0 to 2.8 bar (0 to 40 psig), and J0 to 3.8 bar
(0 to 55 psig)
Maximum Diaphragm Sizing Pressure(1, 2)
3.8 bar (55 psig)
Maximum Diaphragm Casing Pressure(1, 7)
4.5 bar (65 psig)
Maximum Valve Shaft Rotation
J90 degrees (adjustable through 60 degrees with
integral travel stops)
Acceptable Valve Shaft Diameters, mm (Inches)
F and G mounting: J12.7 (1/2), J15.9 (5/8), or J
19.1 (3/4)
H mounting: varies—uses 22.2 mm (7/8 inch) output
shaft with two flats
J mounting: J9.5 (3/8), J12.7 (1/2), or 15.9 (5/8)
Stroking Time
Dependent of actuator size, rotation, spring rate,
initial spring compression, supply pressure, and size
of supply piping. If stroking time is critical, consult
your Emerson Automation Solutions sales office.
Diaphragm Casing Displacement
Clearance Volume(3): 623 cm3(38 cubic inches)
Casing Volume(4)
90 Degree Rotation: 2390 cm3(146 cubic inches)
60 Degree Rotation: 1890 cm3(115 cubic inches)
Material Temperature Capabilities(1)
NBR (nitrile) Diaphragm or O‐rings(5):
-40 to 82_C (-40 to 180_F)
VMQ (silicone) Diaphragm:
-40 to 149_C (-40 to 300_F)
POM (polyoxymethylene) Push Rods and Guides
(used with lever‐operated switches):
-40 to 82_C(6) (-40 to 180_F)
Travel Indication
Graduated disc and pointer
Pressure Connections
Standard: 1/4 NPT internal
Optional: J1/2 or J3/4 NPT internal
Mounting Positions
See figure 2
Approximate Weights
1051: 20 kg (45 pounds)
1052: 21 kg (46 pounds)
1. The pressure/temperature limits in this manual and any applicable standard or code limitation for valve should not be exceeded.
2. Use this value to determine the maximum torque output allowed.
3. Volume when the diaphragm is in the up position.
4. Includes clearance volume.
5. NBR (nitrile) O‐rings are used in the optional top‐mounted handwheel and in the optional up travel stop assembly.
6. For higher temperature ratings, contact your Emerson sales office.
7. This maximum casing pressure is not to be used for normal operating pressure. Its purpose is to allow for typical regulator supply settings and/or relief valve tolerances.
Do not install, operate, or maintain a 1051 or 1052 actuator without being fully trained and qualified in valve, actuator,
and accessory installation, operation, and maintenance. To avoid personal injury or property damage, it is important
to carefully read, understand, and follow all the contents of this manual, including all safety cautions and warnings. If
you have any questions about these instructions, contact your Emerson sales office or Local Business Partner before
proceeding.
Description
1051 and 1052 Size 33 spring‐and‐diaphragm actuators are used on rotary‐shaft valve bodies for throttling or on‐off
applications. The 1051 may be used for on‐off service without a positioner or for throttling service with a positioner.

Instruction Manual
D101322X012
1051 and 1052 Size 33 Actuators
June 2017
3
The 1052 uses an adjustable spring seat to control spring compression. It may be used for on‐off service without a
positioner, or it may be used for throttling service with or without a positioner, depending on service conditions.
A top‐mounted handwheel may be mounted for infrequent service as a manual override. A manual actuator is
recommended for routine and repeated manual operation. Externally adjustable travel stops are used to limit the
degree of rotation at both ends of the actuator stroke. Provisions are included for integral mounting of optional
magnetic proximity switches. Lever‐operated, mechanical switches are also available.
The lever for the 1051 and 1052 size 33 actuator is supported by bushings. The lever may be changed to
accommodate valve bodies with different size valve shafts and different mounting adaptations. Levers and accessories
are available for mounting valve bodies and equipment with the following mounting adaptations:
F and G mounting adaptations (figures 9 and 10) are for use with Fisher splined‐shaft rotary valve bodies with 12.7,
15.9, and 19.1 mm (1/2, 5/8, and 3/4 inch) valve shaft diameters. A stub shaft is available for installation on the end of
the lever opposite the valve body for use as a wrench‐operated extension (for emergency override) or as a means of
connecting a manual actuator (see figure 14).
H mounting (figure 11) is for use with non‐Fisher products and user‐provided mounting brackets and shaft couplings.
It includes a mounting surface with threaded holes for attaching the user‐provided mounting bracket. A 22.2 mm (7/8
inch) stub shaft with flats is pinned to the lever and is used to couple the actuator to the operated equipment. A
second stub shaft may be installed on the opposite end of the lever for use as a wrench‐operated extension (for
emergency override) or as a means for connecting a manual actuator (see figure 14). Stub shafts are available in
standard and reverse constructions (see figure 12) to provide proper operation with the mounting position and
actuator action desired (see figure 2).
J mounting (figure 13) permits use of the actuator with Fisher keyed‐shaft valve bodies and other keyed‐shaft
equipment with 9.5, 12.7, and 15.9 mm (3/8, 1/2, and 5/8 inch) shaft diameters. A stub shaft is pinned to the lever and
a valve shaft coupling is pinned to the stub shaft. The coupling has multiple keyways (see figure 4) to accommodate
mounting in the desired position. A second stub shaft may be installed on the opposite end of the lever for use as a
wrench‐operated extension (for emergency override) or as a means for connecting a manual actuator (see figure 14).
Table 2. Bolting Torque Requirements(1)
DESCRIPTION KEY NUMBER BOLT SIZE
TORQUE
NSm LbfSft
Diaphragm Casing 5 3/8‐24 27 20
Travel Stop 8 7/16‐14 27 20
Diaphragm to rod 9 3/8‐24 54 40
Rod end to lever 18 3/8‐16 54 40
Housing to yoke 23 5/16‐18 41 30
Housing to cover 34 5/16‐18 41 30
Yoke to valve 71 3/8‐16 (See appropriate valve instruction manual)
Clamped lever 28 3/8‐16 54 40
Switch Nut 78 3/8‐16 27 20
1. Exceeding any torque requirements could damage the actuator and impair safe operation.
Specifications
Specifications are shown in table 1 for 1051 and 1052 size 33 actuators. Some specifications for a given actuator as it
originally comes from the factory are stamped on a metal nameplate attached to the actuator.
Installation
WARNING
Always wear protective gloves, clothing, and eyewear when performing any installation operations.

Instruction Manual
D101322X012
1051 and 1052 Size 33 Actuators
June 2017
4
Check with your process or safety engineer for any other hazards that may be present from exposure to process media.
If installing into an existing application, also refer to the WARNING at the beginning of the Maintenance section in this
instruction manual.
MOUNTING ACTION(1)
VALVE SERIES OR DESIGN VALVE SERIES OR DESIGN
BALL/PLUG
ROTATION TO
CLOSE
V250 V150, V200 & V300 CV500
V500
DISC/BALL
ROTATION TO
CLOSE
V250
8510B, 8532,
8560
& 9500
Right‐Hand PDTC
PDTO
CCW
CCW
A
B
A
B
A
B
CW
CW
NA
NA
B
A
Left‐Hand PDTC
PDTO
CCW
CCW
NA
NA
D
C
D
C
CW
CW
C
D
C
D
Left‐Hand
(Optional)(2)
PDTC
PDTO
CW
CW
NA
NA
C
D
NA
NA
NA
NA
NA
NA
NA
NA
1. PDTC—Push‐down‐to‐close, and PDTO—Push‐down‐to‐open.
2. A left hand ball will be required for the NPS 3 through 12 Series B and the NPS 14 to 20, with or without attenuator.
Figure 2. Mounting Styles and Positions for Fisher 1051 and 1052 Actuators
1
NOTES:
POSITION 1 IS STANDARD; POSITIONS 2 THROUGH 4
(SHOWN IN DOTTED LINES) ARE ALTERNATIVES.
1
STYLE D
STYLE C
STYLE B
STYLE A
RIGHT‐HAND
MOUNTING
43A6505‐A
A1584‐3
STYLE A STYLE B
STYLE D STYLE C
FLOW
FLOW
RIGHT‐HAND MOUNTING
LEFT‐HAND MOUNTING
POSITION 1 POSITION 1
POSITION 1 POSITION 1
4
3
24
3
2
4
3
24
3
2
LEFT‐HAND
MOUNTING
1
1
1

Instruction Manual
D101322X012
1051 and 1052 Size 33 Actuators
June 2017
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CAUTION
To avoid parts damage, do not use an operating pressure that exceeds the Maximum Diaphragm Casing Pressure (table 1)
or produces a torque greater than the Maximum Allowable Valve Shaft Torque (see Catalog 14). Use pressure‐limiting or
pressure‐relieving devices to prevent the diaphragm casing pressure from exceeding its limit.
The actuator, as it comes from the factory, is normally mounted on a valve body. Follow the procedures given in the
valve instruction manual when installing the control valve in the pipeline.
If a positioner is ordered with the actuator, the pressure connection to the actuator is normally made at the factory. If
it is necessary to make this connection, run either 1/4 inch pipe or 3/8 inch tubing (for standard diaphragm case
fittings) between the pressure connection and the instrument. Keep the length of tubing or pipe as short as possible to
avoid transmission lag in the control signal.
When the control valve is completely installed and connected to the controlling instrument, check to make sure that
the action is correct (air‐to‐open or air‐to‐close) and that the controlling instrument is properly configured for the
desired action. For successful operation, the diaphragm rod, lever, and valve shaft must move freely in response to
changes in the loading pressure on the diaphragm.
Actuator Mounting and Changing Actuator Mounting
Use the following steps to mount the actuator or to change actuator mounting style or position.
F and G Mounting Adaptations
Unless otherwise specified, key numbers referenced in the following procedures are shown in figure 9 for the 1051
actuator and in figure 10 for the 1052 actuator.
1. Proceed as appropriate:
If the Actuator is mounted on a valve body and it is necessary to change mounting style or position, the actuator must
first be separated from the valve body. Proceed to the Disassembly portion of the Changing or Replacing Actuator
Lever procedure, observe all warnings, perform steps 1 through 6, and return to step 2 which follows.
If the Actuator is not mounted on a valve body, proceed to the Disassembly portion of the Changing or Replacing
Actuator Lever procedure, perform steps 2 through 5, and return to step 2 which follows.
2. Refer to figure 2 for available mounting styles and positions. When mounting on a Vee‐Ball™ V150, V200 or V300
valve, check the valve manual to determine if it is Series B. The actuator is normally positioned vertically with the
valve in a horizontal pipeline.
3. Determine whether the actuator mounting yoke (key 22) will be mounted on the housing cover assembly (key 33)
side or on the actuator housing boss side of the actuator. If the desired mounting position and style require moving
the mounting yoke and travel indicator (key 35) to opposite sides of the actuator, remove the machine screws (key
38), the travel indicator pointer (key 37), the machine screws, and the travel indicator scale (key 35). Remove the
cap screws (key 23) and the mounting yoke. Install the mounting yoke in the desired position (on the housing cover
assembly or on the actuator housing boss). See table 2 for recommended torque for the mounting cap screws.
Install the travel indicator components on the opposite side of the actuator. See figure 14 for travel indicator
components used with wrench‐operated extensions and manual actuators.
4. Before sliding the valve shaft into the lever, position the valve ball or disc as follows:
For push‐down‐to‐close action, the valve ball or disc should be in the fully open position.

Instruction Manual
D101322X012
1051 and 1052 Size 33 Actuators
June 2017
6
For push‐down‐to‐open action, the valve ball or disc should be in the fully closed position (see the valve body
instruction manual).
5. Make sure that the index markings on the valve shaft are properly aligned with the markings on the lever and slide
the valve shaft into the lever. Install the valve mounting cap screws, washers, and nuts and tighten to the torque
value given in the appropriate valve body instruction manual.
6. Ensure all end play in the valve shaft is removed by pulling the valve shaft toward the actuator as much as possible.
Make sure the actuator rod is perpendicular to the valve shaft. Refer to the valve instruction manual for specific end
play considerations.
Figure 3.Travel Stops and Switch Positions on the Fisher 1051 and 1052 Size 33 Actuator
HOUSING COVER
ASSEMBLY (KEY 33) PROXIMITY
SWITCHES
MOUNTING POSITION FOR
SWITCH INDICATING
TOP OF STROKE
(ACTIVATED BY
OUTER CAM)
YOKE
MOUNTING
BOSS
UP TRAVEL
STOP
DOWN TRAVEL STOP
MOUNTING POSITION FOR SWITCH
INDICATING BOTTOM OF STROKE
(ACTIVATED BY INNER CAM)
W4738
7. Tighten the socket head cap screw which compresses the splined lever connection to the valve shaft (see table 2).
CAUTION
When adjusting the travel stop for the closed position of the valve ball or disc, refer to the appropriate valve instruction
manual for detailed procedures. Undertravel or overtravel at the closed position may result in poor valve performance
and/or damage to the equipment.
8. Adjust the up travel stop (see figure 3) so that the valve ball or disc is in the desired position.
WARNING
To avoid personal injury and equipment damage from moving parts, keep fingers and tools clear while stroking the
actuator with the cover removed.
9. Stroke the actuator and adjust the down travel stop so that the valve ball or disc is in the desired position.

Instruction Manual
D101322X012
1051 and 1052 Size 33 Actuators
June 2017
7
10. Make sure that the travel indicator pointer matches the ball or disc position. Remove and install in the proper
position if necessary.
11. Install the cover plate or switch mounting plate (key 59) with cap screws (key 60).
12. Refer to the table of contents for accessory installation procedures.
H Mounting Adaptation
Unless otherwise specified, key numbers referenced in the following procedures are shown in figure 9 for the 1051
actuator and in figure 10 for the 1052 actuator. Unique parts used for the H mounting adaptation are shown in figure
11 for single stub shaft construction and in figure 14 for dual stub shaft construction.
1. To change mounting style or position, the actuator must be separated from the valve body (or other operated
equipment). Remove the cap screws used to attach the actuator to the valve body (or other operated equipment)
and remove the actuator.
2. Determine the desired mounting position. Note that stub shafts are available in standard and reverse constructions
so that proper alignment with the operated equipment can be achieved (see figure 12). Refer to figure 2 for
available mounting styles and positions.
3. If it is necessary to install or change stub shaft(s), the actuator lever (key 27) must be removed. Perform all
applicable operations in the Disassembly portion of the Changing or Replacing Actuator Lever procedure. Install the
stub shafts for the construction desired (refer to figures 11 and 14) and reassemble the actuator.
4. Determine whether the operated equipment will be mounted on the housing cover assembly (key 33) side or on
the actuator housing boss side of the actuator. Depending on the desired mounting style and position, it may be
necessary to move the operated equipment and travel indicator components to opposite sides of the actuator. If
so, remove the travel indicator components, the operated equipment, and the mounting bracket if used. Install the
operated equipment or mounting bracket in the desired position (on the housing cover assembly or on the actuator
housing boss). See table 2 for recommended torque for the mounting cap screws. Install the travel indicator
components on the side of the actuator opposite the operated equipment. Refer to figure 14 for travel indicator
components used with wrench‐operated extensions and manual actuators.
5. Before coupling the operated equipment to the actuator stub shaft, position the equipment as follows:
For push‐down‐to‐activate (open) action, the equipment should be in the fully deactivated (closed) position.
For push‐down‐to‐deactivate (close) action, the equipment should be in the fully activated (open) position.
6. Install the required shaft coupling and the operated equipment.
CAUTION
When adjusting the travel stops to limit rotation, be certain that the rotation produced does not exceed the safe limit of the
operated equipment. Undertravel or overtravel may result in poor performance and/or damage to the equipment.
7. Adjust the up travel stop (see figure 3) so that the operated equipment is in the desired position.
WARNING
To avoid personal injury and equipment damage from moving parts, keep fingers and tools clear while stroking the
actuator with the cover removed.
8. Stroke the actuator and adjust the down travel stop so that the operated equipment is in the desired position.

Instruction Manual
D101322X012
1051 and 1052 Size 33 Actuators
June 2017
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9. Make sure that the travel indicator pointer matches the ball or disc position. Remove and install in the proper
position if necessary.
10. Refer to the table of contents for accessory installation procedures.
J Mounting Adaptation
Unless otherwise specified, key numbers referenced in the following procedures are shown in figure 9 for the 1051
actuator and in figure 10 for the 1052 actuator. Unique parts used for the J mounting adaptation are shown in figure
13 for single stub shaft construction and in figure 14 for dual stub shaft construction.
1. If the actuator is mounted on a valve body and it is necessary to change mounting style or position, the actuator
must be separated from the valve body. Proceed to the disassembly portion of the Changing or Replacing Actuator
Lever procedure, observe all warnings, perform steps 1 through 6, and return to step 2 which follows.
2. Refer to figure 2 for available mounting styles and positions. The actuator is normally mounted vertically on a valve
body that is installed in a horizontal pipeline.
3. If it is necessary to install or change stub shaft(s), the actuator lever (key 27) must be removed. Perform all
applicable operations in the Disassembly portion of the Changing or Replacing Actuator Lever procedure. Install the
stub shafts for the construction desired as shown in figure 13 and reassemble the actuator.
4. Determine whether the actuator mounting yoke (key 22) will be mounted on the housing cover assembly (key 33)
or on the actuator housing boss. If the desired mounting position and style requires moving the mounting yoke and
travel indicator components to opposite sides of the actuator, remove the travel indicator components, the valve
shaft coupling (key 80 for 1051, or key 90 for 1052), cap screws (key 23), and the mounting yoke. Install the
mounting yoke in the desired position (on the housing cover assembly or on the actuator housing boss). See table 2
for recommended torque for the mounting cap screws. Install the valve shaft coupling on the actuator stub shaft.
Install the travel indicator components on the opposite side of the actuator. See figure 14 for travel indicator
components used with wrench‐operated extensions and manual actuators.
5. Before coupling the valve to the actuator, position the valve ball or disc as follows:
For push‐down‐to‐close action, the valve ball or disc should be in the fully open position.
For push‐down‐to‐open action, the valve ball or disc should be in the fully closed position (see the valve body
instruction manual).
6. The valve shaft coupling (see figure 4) has two keyways lettered A and B (the letters C and D on the coupling are not
used and may be disregarded). Align the appropriate keyway with the keyway in shaft of the operated equipment.
When used with a Fisher butterfly valve body, refer to the table and illustration in figure 4 for proper orientation of
the coupling and valve shaft. Install the woodruff key (key 81 for 1051, key 91 for 1052) in the valve shaft keyseat,
lubricate the inside of the coupling, and slide the valve shaft into the coupling.
7. Install the valve mounting cap screws, washers, and nuts and tighten to the torque value given in the appropriate
valve body instruction manual.
CAUTION
When adjusting the travel stop for the closed position of the valve ball or disc, refer to the appropriate valve body
instruction manual for detailed procedures. Undertravel or overtravel at the closed position may result in poor valve
performance and/or damage to the equipment.
8. Adjust the up travel stop so that the valve ball or disc is in the desired position.

Instruction Manual
D101322X012
1051 and 1052 Size 33 Actuators
June 2017
9
DESIRED
ACTUATOR
ACTION
DESIRED
SHAFT
ROTATION,
DEGREES
ACTUATOR
MOUNTING
POSITION
COUPLING
KEYWAY
TO USE(3)
VALVE SHAFT KEYWAY TO USE FOR FISHTAIL™
DISC VALVE BODIES(1) (SEE FIGURE 2)
Clockwise to
Close Valve Action(2)
Counterclockwise to
Close Valve Action(2)
Flow Left
to Right(2)
Flow Right
to Left(2)
Flow Left
to Right(2)
Flow Right
to Left(2)
Push Down to Open
(PDTO) 60 or 90
1 B Nose Tail Tail Nose
2 A Tail Nose Nose Tail
3 B Tail Nose Nose Tail
4 A Nose Tail Tail Nose
Push Down to Close
(PDTC) 60(3) or 90
1 A Tail Nose Tail Nose
2 B Tail Nose Tail Nose
3 A Nose Tail Nose Tail
4 B Nose Tail Nose Tail
1. For conventional disc valve bodies, use either valve shaft keyway.
2. When viewed from actuator side of valve body.
3. For 60‐degree rotation with PDTC action, the coupling and actuator output shaft assembly will offset 30 degrees clockwise (for actuator housing construction style B), or counterclock
wise (for actuator housing construction Style A) in the lever when viewed from the splined end of the actuator shaft. 30 degrees is one spline tooth for 9.5, 12.7, and 15.9 mm (3/8, 1/2,
and 5/8 inch) valve shafts and two spline teeth for 19.1 mm (3/4 inch) valve shafts.
Figure 4. Valve Shaft Coupling for the J Mounting Adaptation
A3253*
19A1465‐B
NOTES:
FOR USE WITH J MOUNTING ADAPTATION.
COUPLING
FULL KEYWAY
LOCATED ON
NOSE AND TAIL
SIDE OF VALVE SHAFT
VALVE SHAFT
PARTIAL KEYWAY
FOR DETERMINING
DISC POSITION
USE APPROPRIATE
VALVE SHAFT
KEYWAY AS
INDICATED
IN TABLE 5
USE APPROPRIATE LETTERED
KEYWAY AS INDICATED IN
TABLE 5 KEYWAY A KEYWAY B
ABOVE
KEYWAY A
EXPLODED VIEW OF VALVE SHAFT
AND COUPLING
REFERENCE COUPLING ORIENTATION
FOR TABLE 5
1
1
WARNING
To avoid personal injury and equipment damage from moving parts, keep fingers and tools clear while stroking the
actuator with the cover removed.
9. Stroke the actuator and adjust the down travel stop so that the valve ball or disc is in the desired position.
10. Make sure that the travel indicator pointer matches the ball or disc position. Remove and install in the proper
position if necessary.

Instruction Manual
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1051 and 1052 Size 33 Actuators
June 2017
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11. Refer to the table of contents for accessory installation procedures.
Figure 5. Spring Adjustment
W4767
TRAVEL
STOPS
1052 Spring Compression Adjustment
Initial Compression
Key numbers referred to in this procedure are shown in figure 10 unless otherwise specified.
The 1052 nameplate specifies an initial set adjusted into the actuator spring. Initial set is the casing pressure at which
the diaphragm (key 3) and diaphragm rod (key 10) begin to move away from the stop in the upper diaphragm case
(key 1) when the actuator is disengaged from the control valve body or other operated equipment. The initial set was
determined from the service conditions specified when the actuator was ordered, so that when the actuator and valve
are in service, the valve ball or disc seats properly and full travel is obtained with the supply pressure specified on the
order and shown on the nameplate.
Before adjusting spring tension to change initial set, the valve body or other operated equipment must be removed or
otherwise disengaged from the actuator. Refer to the applicable steps given under the appropriate mounting
adaptation in the Actuator Mounting and Changing Actuator Mounting procedure.
To gain access to the spring adjusting screw, either the spring adjuster cover (key 117) or the switch mounting plate
(key 59) must be removed. If externally mounted switches are used, remove them as an assembly by removing the cap
screws (key 75, figure 16) and the switch mounting plate (key 1, figure 16). In order to gain access to the cap screws, it
may be necessary to loosen the hex nuts (key 77, figure 16) and slide the switches away from the actuator housing.
Note that the lower part of the spring adjusting screw (key 74) is notched so that it can be rotated with a screwdriver
or other flat‐bladed tool. To decrease spring compression, rotate the spring adjusting screw to the right (see figure 5).
To increase spring compression, rotate the spring adjusting screw to the left (clockwise when viewed from above).
Adjust the spring so that the diaphragm rod just starts to travel at the initial set pressure specified on the nameplate.
When the desired initial set has been achieved, install the spring adjuster cover or switch mounting plate.

Instruction Manual
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1051 and 1052 Size 33 Actuators
June 2017
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Table 3. Spring for Fisher 1052 Actuator(1)
CASING PRESSURE INITIAL SPRING COMPRESSION
60 Degree Rotation 90 Degree Rotation
Bar Psig Push‐down‐to‐open Push‐down‐to‐open Push‐down‐to‐close
Bar Psig Bar Psig Bar Psig
0-1.2 0-18
0.3 3.9 0.2 2.7 0.2 2.7
0.4 5.4 0.3 3.7 0.2 3
0.4 6.1 0.3 4.9 0.2 3
0‐2.3 0‐33
0.3 3.9 --- --- 0.2 2.7
0.4 5.4 0.3 3.7 0.3 3.7
0.5 7.1 0.3 4.9 0.3 4.9
0.7 9.7 0.4 6.3 0.2 3
0‐2.8 0‐40
0.3 3.9 --- --- 0.2 2.7
0.4 5.4 0.3 3.7 0.3 3.7
0.5 7.1 0.3 4.9 0.3 4.9
0.7 9.7 0.4 6.3 0.2 3.5
0‐3.8 0‐55 --- --- 0.3 4.9 0.3 4.9
0.7 9.7 0.4 6.3 0.4 6.3
0.2‐1 3‐15 --- --- 0.3 3.7 0.2 3
0.2‐2.1 3‐30
--- --- --- --- 0.3 3.7
--- --- 0.3 4.9 0.3 4.9
--- --- 0.4 6.3 0.2 3
1. For more detailed information concerning proper spring selection to obtain the torque required, consult your Emerson sales office.
Stroking Range
Key numbers referred to in this procedure are shown in figure 10 unless otherwise specified.
If, under operating conditions, the desired stroking range cannot be achieved with the casing pressure used, it may be
possible to shift the stroking range by making a spring adjustment to change the initial spring compression. A spring
adjustment shifts the casing pressure span and equally increases (or decreases) the casing pressure at which the
actuator begins to stroke and the pressure at which the actuator reaches full travel.
To gain access to the spring adjusting screw, either the spring adjuster cover (key 117) or the switch mounting plate
(key 59) must be removed. If externally mounted switches are used, remove them as an assembly by removing the cap
screws (key 75, figure 16) and the switch mounting plate (key 1, figure 16). In order to gain access to the cap screws, it
may be necessary to loosen the hex nuts (key 77, figure 16) and slide the switches away from the actuator housing.
Note that the lower part of the spring adjusting screw (key 74) is notched so that it can be rotated with a screwdriver
or other flat bladed tool. To shift the casing pressure span downward, rotate the spring adjusting screw to the right
(see figure 5). To shift the casing pressure span upward, rotate the spring adjusting screw to the left. When the desired
stroking range has been achieved, replace the spring adjuster cover or the switch mounting plate.
Maintenance
Actuator parts are subject to normal wear and must be inspected and replaced as necessary. The frequency of
inspection and replacement depends upon the severity of service conditions. Instructions are given below for
disassembly and assembly of parts. Key numbers referenced in the following steps are shown in figure 9 for the 1051
actuator and in figure 10 for the 1052, except as listed below or otherwise specified in the procedures.

Instruction Manual
D101322X012
1051 and 1052 Size 33 Actuators
June 2017
12
Mounting Adaptations
F and G Adaptations
The procedures given in this instruction manual apply directly to F and G mounting adaptations. Refer to figures 9 and
10.
H Mounting Adaptations
Whenever the procedures require separating the actuator from the operated equipment, it may be necessary to
remove brackets, couplings, and stub shafts before proceeding. Refer to figure 11 for parts used with the H mounting
adaptation.
J Mounting Adaptations
Whenever the procedures require separating the actuator from the valve body, it may be necessary to remove
couplings and keyways. Refer to figure 13 for parts used with the J mounting adaptation.
WARNING
Avoid personal injury or property damage from sudden release of process pressure or bursting of parts. Before performing
any maintenance operations:
D Do not remove the actuator from the valve while the valve is still pressurized.
D Always wear protective gloves, clothing, and eyewear when performing any maintenance operations.
D Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the
actuator cannot suddenly open or close the valve.
D Use bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process pressure
from both sides of the valve. Drain the process media from both sides of the valve.
D Vent the power actuator loading pressure and relieve any actuator spring precompression.
D Use lock‐out procedures to be sure that the above measures stay in effect while you work on the equipment.
D The valve packing box may contain process fluids that are pressurized, even when the valve has been removed from the
pipeline. Process fluids may spray out under pressure when removing the packing hardware or packing rings.
D Check with your process or safety engineer for any hazards that may be present from exposure to process media.
Replacing Diaphragm
Disassembly
1. Bypass the control valve. Relieve all loading pressure, and remove the tubing or pipe from the upper diaphragm
case (key 1).
2. Observe the position of the travel indicator pointer (key 37) and mark its position on the travel indicator scale
(key 35).
WARNING
Failure to control spring tension against the upper diaphragm case as outlined in the following step could result in sudden
spring decompression causing bodily injury or equipment damage. Control spring tension by following step 3 closely.

Instruction Manual
D101322X012
1051 and 1052 Size 33 Actuators
June 2017
13
3. Loosen the hex jam nut (key 84 for 1051, or key 86 for 1052) on the up travel stop. This stop is nearest to the
positioner or positioner cover (key 39; also see figure 3). Screw the travel stop in (turn it clockwise) until it can be
verified that all spring tension has been removed from the diaphragm stop in the upper diaphragm case, i.e. when
any movement of the travel indicator pointer is observed, all spring tension against the upper diaphragm case stop
has been removed. Do not rotate the travel stop past this position as additional compression of the spring is not
necessary or desirable.
4. Carefully remove all cap screws and hex nuts (keys 5 and 6) from the diaphragm case.
5. Remove the diaphragm case and the diaphragm (key 3).
6. Inspect the diaphragm plate (key 4). If the diaphragm plate is damaged or if further disassembly of the actuator is
required, proceed to the Diaphragm Plate, Diaphragm Rod, Spring, and Spring Seat procedure.
7. Inspect the diaphragm and replace if necessary.
Assembly
1. Place the diaphragm (key 3) on the diaphragm plate (key 4), making certain that it is properly centered.
2. Make sure that the up travel stop (see figure 3) is screwed in sufficiently to eliminate interference of the diaphragm
plate (key 4) with the upper diaphragm case.
3. Observe the correct position of the loading connection fitting and install the upper diaphragm case (key 1). Replace
the cap screws and nuts (keys 5 and 6) which secure the upper diaphragm case to the actuator housing. Tighten the
nuts in an alternating fashion (see table 2).
CAUTION
When adjusting the travel stop for the closed position of the valve ball or disc, refer to the appropriate valve body
instruction manual for detailed procedures. Undertravel or overtravel of many valve types may result in poor valve
performance and/or damage to the equipment.
4. Adjust the up travel stop (see figure 3). If the upper travel stop establishes the closed position of the valve ball or
disc, refer to the valve body instruction manual and follow the procedures given for properly establishing the closed
position. Proceed as appropriate:
For F, G, and J mounting adaptations, perform operations beginning with step 8 under the appropriate mounting
adaptation section of the Actuator Mounting and Changing Actuator Mounting procedure.
For H mounting adaptations, perform operations beginning with step 7 under the appropriate mounting adaptation
section of the Actuator Mounting and Changing Actuator Mounting procedure.
5. Return the travel indicator pointer to its original position as previously marked on the travel indicator scale.
6. Install the inlet piping to the upper diaphragm case.
Replacing Diaphragm Plate, Diaphragm Rod, Spring, and Spring Set
Disassembly
1. Perform steps 1 through 6 of the Disassembly portion of the Replacing Diaphragm procedure above.
For 1052 Actuators Only
a. Before removing the diaphragm plate, spring compression must be relieved. Proceed as appropriate to gain
access to the spring adjusting screw:

Instruction Manual
D101322X012
1051 and 1052 Size 33 Actuators
June 2017
14
D Without lever‐operated switches, remove the cap screws (key 21) and the spring adjuster cover (key 117).
D With lever‐operated switches, remove the switches as an assembly by removing the cap screws (key 75, figure 16)
and the switch mounting plate (key 1, figure 16). In order to gain access to the cap screws, it may be necessary to
loosen the hex nuts (key 77, figure 16) and slide the switches away from the actuator housing.
WARNING
To avoid personal injury from precompressed spring force suddenly thrusting parts away from the actuator, spring
compression must first be relieved by rotating the spring adjusting screw until the spring seat is bottomed against the
spring adjuster. Closely follow the instructions below.
b. To relieve spring compression, insert a screwdriver into the notches on the spring adjusting screw and rotate the
spring adjusting screw to the right (counter‐clockwise when viewed from the top of the actuator) until the spring
seat (key 13) is bottomed against the spring adjuster.
2. For 1051 and 1052 Actuators, using a 5/16 inch hex wrench, unscrew and remove the socket head cap screw (key 9)
which secures the diaphragm plate (key 4) to the diaphragm rod (key 10). Remove the diaphragm plate and the
upper thrust washer (key 83 for 1051, or key 72 for 1052).
3. For the 1051, remove the spring (key 11) and spring seat (key 14).
For the 1052, remove the spring (key 11), spring seat with adjusting screw (keys 74 and 14), and lower thrust washer
(key 72).
Note
At this stage of disassembly, it may be determined that further disassembly is not necessary. If separation of the diaphragm rod
from the lever is not warranted, proceed to the Assembly portion of this procedure.
4. To gain access to the cap screw (key 18) which secures the diaphragm rod to the lever, the housing cover assembly
(key 33) must be removed. Before the housing cover assembly can be removed, one of the following procedures
must be performed. Proceed as appropriate:
For actuators with valve bodies mounted on the housing cover assembly (key 33) side of the actuator, the actuator
must be separated from the valve body to provide access to the cap screw (key 18). Proceed to the Disassembly
portion of the Changing or Replacing Actuator Lever procedure and perform steps 2 through 6.
For actuators with valve bodies mounted on the actuator housing boss side of the actuator, remove the travel
indicator pointer (key 37).
5. Remove the cap screws and washers (keys 34 and 63) and the housing cover assembly (key 33).
6. Remove the outer switch cam, if used, by removing the two hex head machine screws, spacers, and retaining
washers (keys 119, 132, and 144, figures 15 and 16). Note that the retaining washers help to keep all parts together
as an assembly.
7. Remove the cap screw (key 18) that secures the actuator lever (key 27) to the diaphragm rod. Remove the
diaphragm rod.
8. Inspect all parts and replace if necessary.
9. If total disassembly of the actuator is required, or if the actuator will be assembled for use with a valve body with a
different valve shaft diameter, proceed to the Changing or Replacing Actuator Lever procedure.

Instruction Manual
D101322X012
1051 and 1052 Size 33 Actuators
June 2017
15
SPRING NO. DIMENSION A
mm Inches
10B1522 42.7 1.68
10B1523 42.7 1.68
10B1524 42.7 1.68
10B1525 36.6 1.44
Figure 6. Spring Seat Pre‐Set Dimensions for the Fisher 1052 Size 33 Actuator
10B1601‐A
A3777
A
Assembly
For the 1052 Only
a. Lubricate the threads of the spring adjusting screw (key 74) with lithium grease. Also lubricate the bottom
portion of the spring adjusting screw which contacts the lower thrust washer (key 72).
b. Screw the spring adjusting screw onto the spring seat (key 14) to minimize spring seat adjustment after
assembly, refer to figure 6 and pre‐set the spring adjusting screw to the appropriate dimension.
c. Place the lower thrust washer into the lower spring barrel area.
For 1051 and 1052
1. Lubricate the threads of the socket head cap screw (key 9) with lithium grease. Also lubricate the bottom surface of
the diaphragm plate which contacts the upper thrust washer (key 83 for 1051, or key 72 for 1052).
2. Insert the socket head cap screw through the diaphragm plate (key 4) and into the diaphragm rod (key 10). Tighten
the cap screw four or five turns.
3. Install the spring seat (with spring adjusting screw for the 1052 actuator), spring, and upper thrust washer.
4. Insert the diaphragm plate/diaphragm rod assembly into the spring barrel. Make sure that the notch in the
diaphragm rod is oriented according to the view shown in figures 9 and 10, i.e. the notch in the diaphragm rod must
face the positioner or positioner cover plate (key 39).
5. Rotate the lever so that it straddles the spherical bearing in the diaphragm rod. It may be necessary to exert lateral
pressure on the diaphragm rod to achieve alignment of the rod with the lever. Install the cap screw (key 18) (see
table 2). Use the up travel stop (see figure 3) to keep the lever from rotating during tightening.
6. If the actuator uses an outer switch cam, install the outer cam (key 170, figures 15 and 16) using the two hex head
machine screws, spacers, and retaining washers (keys 119, 132, and 144). Note that the retaining washers help to
keep all parts together as an assembly to ease installation. Make sure that the cam is mounted on the lever
according to the orientation shown in figure 7.

Instruction Manual
D101322X012
1051 and 1052 Size 33 Actuators
June 2017
16
Figure 7. Orientation of Switch and Positioner Cams on the Lever of the Fisher 1051 and 1052 Size 33 Actuator
INNER SWITCH CAM
(ACTIVATES SWITCH
INDICATING BOTTOM
OF STROKE)
SPACERS
(KEY 132)
POSITIONER
CAM
OUTER SWITCH CAM (ACTIVATES
SWITCH INDICATING TOP OF STROKE)
W4767
7. Install the housing cover assembly (key 33) with cap screws and washers (keys 34 and 63).
8. Tighten the socket head cap screw (key 9) with a 5/16 hex wrench until the diaphragm plate is fully seated against
the diaphragm rod. Tighten the cap screw to the torque value in table 2.
9. Perform steps 1 through 5 of the Assembly portion of the Replacing Diaphragm procedure.
10. For 1052 actuators, refer to the 1052 Spring Compression Adjustment procedure and adjust the spring for the
desired initial set.
11. Install the cover plate or switch mounting plate (key 59) with cap screws (key 60). If switches are used, observe the
marks made during removal of the cover plate.
12. Install the spring adjuster cover (key 117) or the switch mounting plate (key 1, figure 16) with the appropriate cap
screws.
13. Install the travel indicator (key 37) if removed.
14. If the actuator was removed from the valve body, refer to the appropriate section in the Actuator Mounting and
Changing Actuator Mounting procedure and proceed as follows:
For F and G mounting adaptations, perform all applicable steps beginning with step 3.
For H and J mounting adaptations, perform all applicable steps beginning with step 4.
Changing or Replacing Actuator Lever
Note
The lever and associated parts may be removed as an independent procedure without disassembling the upper diaphragm casing
or spring barrel components. Or, the lever may be removed after performing the operations given in the Replacing Diaphragm
procedure and in the Diaphragm Plate, Diaphragm Rod, Spring, and Spring Seat procedure.

Instruction Manual
D101322X012
1051 and 1052 Size 33 Actuators
June 2017
17
Disassembly
WARNING
Avoid personal injury or property damage from sudden release of process pressure or bursting of parts. Before performing
any maintenance operations:
D Do not remove the actuator from the valve while the valve is still pressurized.
D Always wear protective gloves, clothing, and eyewear when performing any maintenance operations.
D Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the
actuator cannot suddenly open or close the valve.
D Use bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process pressure
from both sides of the valve. Drain the process media from both sides of the valve.
D Vent the power actuator loading pressure and relieve any actuator spring precompression.
D Use lock‐out procedures to be sure that the above measures stay in effect while you work on the equipment.
D The valve packing box may contain process fluids that are pressurized, even when the valve has been removed from the
pipeline. Process fluids may spray out under pressure when removing the packing hardware or packing rings.
D Check with your process or safety engineer for any other hazards that may be present from exposure to process media.
1. Isolate the valve body from the process. Release process pressure and vent all actuator pressure.
2. If externally mounted switches are used, remove them as an assembly by removing the cap screws (key 75, figure
16) and the switch mounting plate (key 1, figure 16). In order to gain access to the cap screws, it may be necessary
to loosen the hex nuts (key 77, figure 16) and slide the switches away from the actuator housing.
3. If switches are used, mark the position of the switch mounting plate (key 59) on the actuator housing so it may be
returned to the exact same position.
4. Remove the cap screws (key 60) and the cover plate or switch mounting plate (key 59). If switches are used, leave
the push rod assemblies (keys 169 and 170, figure 16) or the proximity switch assemblies (key 7, figure 15)
undisturbed.
5. Using a 5/16 inch hex wrench, loosen the socket head cap screw (key 28) which compresses the splined lever
connection around the valve shaft.
6. Separate the actuator from the valve body by removing the cap screws and washers which secure the valve to the
mounting yoke (key 22). For some constructions of H and J mounting adaptations, it may be necessary to remove
other mounting and coupling parts.
7. If the valve body (or other operated equipment) is mounted on the housing cover (key 33) side of the actuator,
remove the mounting yoke and travel indicator pointer.
8. Remove the cap screws and washers (keys 34 and 63) and the housing cover (key 33).
9. If the actuator is equipped with a positioner, remove the positioner cam (see figure 7) by removing the two hex
head machine screws which secure the cam to the lever.
10. If the actuator is equipped with cam‐operated switches, remove the outer cam (see figure 7) with the two hex
head machine screws, spacers, and retaining washers (keys 119, 132, and 144, figures 15 and 16). Note that the
retaining washers help to keep all parts together as an assembly.
WARNING
Failure to relieve spring tension on the diaphragm rod to lever connection before removing the cap screw (key 18) may
result in personal injury and equipment damage from sudden and forceful movement of the diaphragm rod. Relieve spring
tension by performing the operations described in the next step.

Instruction Manual
D101322X012
1051 and 1052 Size 33 Actuators
June 2017
18
11. Relieve all spring loading on the diaphragm rod (key 10) to lever (key 27) connection by backing out (turning
counter‐clockwise) the up position travel stop (see figure 3). When the travel stop is no longer in direct contact with
the lever (key 27), it can be determined that all spring compression is being contained by the stop in the upper
diaphragm case (key 1).
12. Remove the cap screw (key 18) which secures the diaphragm rod (key 10) to the lever (key 27). Disconnect the
lever from the diaphragm rod by rotating the lever away from the diaphragm rod.
13. Remove and inspect the lever. If the lever is worn or damaged, or if the actuator will be mounted to a valve body
requiring a different size lever, replace the lever.
14. Inspect the bushings (key 31). If bushings are excessively worn or damaged, remove them with a press. Press in
new bushings so that they are flush with the interior surfaces of the actuator housing boss and housing cover
assembly.
Assembly
1. Refer to figure 7 for the correct orientation of the inner switch cam (if used); be sure that it is attached to the lever
in the proper orientation.
2. Refer to figure 7 for the correct orientation of the lever during assembly. Insert the lever into the bushing in the
actuator housing boss.
3. If the diaphragm rod has been removed, perform all operations through step 3 of the Assembly portion of the
Diaphragm Plate, Diaphragm Rod, Spring and Spring Seat procedure.
4. Rotate the lever so that it straddles the spherical bearing in the diaphragm rod. It may be necessary to exert lateral
pressure on the diaphragm rod to achieve alignment of the rod with the lever. Install the cap screw (key 18) and
tighten to the torque value in table 2.
5. If an outer switch cam is used, install the cam using the two machine screws, spacers, and retaining washers. Note
that the retaining washers help to keep all parts together as an assembly. Observe the orientation shown in figure 7.
6. If a positioner is used, install the positioner cam with machine screws. Be sure to observe the orientation shown in
figure 7 and follow all procedures given in the positioner instruction manual.
7. Install the housing cover assembly (key 33).
8. If the diaphragm plate has been removed, tighten the socket head cap screw (key 9) with a 5/16 hex wrench until
the diaphragm plate is fully seated against the diaphragm rod. Tighten the cap screw to the torque value in table 2.
9. If the upper diaphragm case has been removed, perform all applicable steps in the Assembly portion of the
Replacing Diaphragm procedure.
10. Refer to the Actuator Mounting and Changing Actuator Mounting procedure and proceed as follows:
For F and G mounting adaptations, start with step 3.
For H and J mounting adaptations, start with step 4.
11. For 1052 actuators only, refer to the 1052 Spring Compression Adjustment procedure and adjust the spring for
the desired initial set.
Proximity Switches, Lever Operated Switches, and Positioner
The proximity switches (see figure 15), lever operated switches (see figure 16), and positioner used with 1051 and
1052 size 33 actuator use cams (see figure 7) mounted on the lever to transmit valve ball or disc position feedback to
the accessories. These cams must be attached to the lever before accessories can be installed.
Installing the Cam
Key numbers referred to in the following procedures are shown in figure 15 for proximity switch installation and in
figure 16 for lever operated switch installation unless otherwise specified. Proceed as appropriate:

Instruction Manual
D101322X012
1051 and 1052 Size 33 Actuators
June 2017
19
For switches which activate at the bottom of the actuator stroke, the inner cam (key 170; also see figure 7) is used.
Installation of the inner cam requires removal of the actuator lever (key 27, figures 9 and 10). To remove the lever,
refer to the Changing or Replacing Actuator Lever procedure and perform all applicable steps in the Disassembly
portion. Install the inner cam with machine screws and retaining washers (keys 117 and 144). Note that the retaining
washers help to keep all parts together as an assembly to ease installation. Reassemble the actuator and install the
actuator on the valve body.
For switches which activate at the top of the actuator stroke, the outer cam (key 170; also see figure 7) is used. If the
valve body or other operated equipment is mounted on the housing cover assembly side of the actuator, it will be
necessary to remove the valve body and the mounting yoke. Refer to the Changing or Replacing Actuator Lever
procedure and perform all applicable steps in the Disassembly portion. Remove the housing cover assembly (key 33).
Install the outer cam with machine screws, spacers, and retaining washers (keys 119, 132, and 144). Note that the
retaining washers help to keep all parts together as an assembly to ease installation. Follow the steps in the Installation
section to reassemble the actuator and install the actuator on the valve body.
For actuators using a positioner, the positioner cam (see figure 7) must be installed on the lever. If the valve body or
other operated equipment is mounted on the housing cover assembly side of the actuator, it will be necessary to
remove the valve body and the mounting yoke. Refer to the Changing or Replacing Actuator Lever procedure and
perform all applicable steps in the Disassembly portion. Remove the housing cover assembly (key 33). Install the cam
on the lever with machine screws in the orientation shown in figure 7 and in the positioner instruction manual. Follow
the steps in the Installation section to reassemble the actuator and install the actuator on the valve body.
Installing Proximity Switches
Key numbers referenced in the following procedures are shown in figure 15 unless otherwise specified.
Switches Indicating Bottom of Stroke
1. Apply inlet pressure to the diaphragm case (key 1, figures 9 and 10) until the actuator is at the bottom of its stroke.
Make sure that the lever (key 27, figures 9 and 10) is against the down position travel stop (see figure 3).
2. Install one 5/8 inch UNF jam nut (key 78) onto the proximity switch (key 7). Screw the switch assembly into the
mounting cover (key 59, figures 9 and 10) so that it is directly over the inner cam (refer to figure 3).
3. Carefully screw the switch into the mounting cover until the electrical contacts close. Maintain a minimum of 0.5
mm (0.02 inch) clearance between the switch and the cam.
4. Lock the switch in place by tightening the locknut (key 78) to the torque value in table 2. When tightening the
locknut, be careful not to turn the switch and thereby reduce its clearance with the cam.
Switches Indicating Top of Stroke
1. Make sure that the air supply to the diaphragm case (key 1, figures 9 and 10) is totally vented and the lever (key 27,
figures 9 and 10) is against the up position travel stop (see figure 3).
2. Install one 5/8 inch UNF jam nut (key 78) onto the proximity switch (key 7). Screw the switch assembly into the
mounting cover (key 59, figures 9 and 10) so that it is directly over the outer cam (refer to figure 3).
3. Carefully screw the switch into the mounting cover until the electrical contacts close. Maintain a minimum of 0.5
mm (0.02 inch) clearance between the switch and the cam.
4. Lock the switch in place by tightening the locknut (key 78) to the torque value in table 2. When tightening the
locknut, be careful not to turn the switch and thereby reduce its clearance with the cam.
Installing Lever‐Operated Switch
Refer to figure 16 for the key numbers referenced in the following procedures and for proper orientation of switches
and switch mounting accessories.

Instruction Manual
D101322X012
1051 and 1052 Size 33 Actuators
June 2017
20
Installing the Push Rod
1. For Switches Indicating Bottom of Stroke, apply inlet pressure to the diaphragm case (key 1, figures 9 and 10) until
the actuator is at the bottom of its stroke. Make sure that the lever (key 27, figures 9 and 10) is against the down
position travel stop (see figure 3).
For Switches Indicating Top of Stroke, make sure that the air supply to the diaphragm case (key 1, figures 9 and 10) is
totally vented and the lever (key 27, figures 9 and 10) is against the up position travel stop (key 8, figures 9 and 10).
2. For Switches Indicating Bottom of Stroke, install one jam nut (key 78) onto the push rod guide (key 169). Refer to
figure 3 and screw the push rod guide into the mounting cover (key 59, figures 9 and 10) so that it is directly over
the inner cam.
For Switches Indicating Top of Stroke, install one jam nut (key 78) onto the push rod guide (key 169). Screw the push
rod guide into the mounting cover (key 59, figures 9 and 10) so that it is directly over the outer cam (refer to figure 3).
3. For both kinds of switches, insert the push rod (key 168) into the push rod guide with its head resting against the
outer surface of the push rod guide.
4. Screw the push rod guide/push rod assembly in until the push rod contacts the cam (key 170).
5. Hold the push rod tightly against the push rod guide and screw the push rod guide into the mounting cover until a
gap of 6.4 to 6.8 mm (0.25 to 0.27 inch) exists between the push rod head and the surface of the push rod guide.
6. Lock the push rod guide in place by tightening the locknut to the torque value in table 2. Be careful not to turn the
push rod guide and thereby reduce its clearance with the push rod head.
7. Install the boot (key 163) over the push rod and the push rod guide.
Mounting Lever‐Operated Switch and Adjustment
1. If used, remove the cap screws and spring adjuster cover (keys 21 and 85 for 1051, or keys 21 and 117 for 1052).
2. Attach the switch mounting plate (key 1) at this location with cap screws (key 75). Tighten the cap screws to the
torque value in table 2.
3. Install the levers onto the switch shafts so that they are parallel to the centerline of the switch when they trip.
4. Insert the round head carriage bolts (key 4) into the switch mounting bracket (key 129). Mount the limit switch
onto the bracket using machine screws and nuts (keys 8 and 9). Tighten the machine screws to 2.8 NSm (5 lbfSft).
5. Attach the switch/mounting bracket assembly to the mounting plate using the nuts and washers (keys 77 and 154).
6. Adjust the switch lever on the shaft so that its roller is in the approximate center of the push rod.
7. With the actuator set at one end of its travel, slide the appropriate switch/bracket assembly toward the actuator
until the roller on the switch lever is in contact with the push rod head and the switch contacts close. Stroke the
actuator to the opposite end of its travel and repeat the adjustment procedure for the other switch.
Positioner Mounting
1. Before installing the positioner, the positioner cam must be installed on the lever (key 10, figures 9 and 10). Refer to
the Installing the Cam procedure.
2. Refer to the positioner instruction manual for setup and calibration procedures.
Top‐Mounted Handwheel
Key numbers used in this procedure are shown in figure 17 except where indicated.
The optional top‐mounted handwheel can be used as a manual actuator for intermittent service or as an adjustable up
travel stop to limit full retraction of the diaphragm rod (key 10, figures 9 and 10).