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
2. Install one 5/8 inch UNF jam nut (key 78) onto the proximity switch (key 7). Screw the switch assembly into the
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.
locknut, be careful not to turn the switch and thereby reduce its clearance with the cam.
Switches Indicating Top of Stroke
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
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.
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.