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.
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