Installing The Push Rod; Mounting Lever-Operated Switch And Adjustment; Positioner Mounting; Top-Mounted Handwheel - Emerson Fisher 1051 Instruction Manual

1051 and 1052 Size 33 Actuators
June 2017

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).
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Instruction Manual
D101322X012