Instruction Manual

Instruction Manual

D101402X012

3660 and 3661 Positioners

January 2013

Mounting on 657 and 667 Actuators

During the following mounting procedures, refer to figures 7, 24, and 25 for key number locations. Figure 7 shows

keys 69 and 70, 73 through 78, and 82 through 93. Other key numbers are shown in either figure 24 for the 3660

positioner or figure 25 for the 3661 positioner.

1. Determine the positioner mounting configuration from figure 2. The actuator size, actuator travel, and positioner

action must be known.

Note

The actuator bench set spring load must be released before removing the stem connector cap screws. Refer to the appropriate

actuator instruction manual for this procedure. After installing the positioner and mounting hardware, reset the actuator bench

set.

2. Attach the connector bracket (key 87) to the actuator stem connector using washers and cap screws (keys 70

and 69), but do not tighten the screws. Refer to figures 7 and 8 for the proper orientation of the connector bracket

with respect to the actuator stem connector. The face of the stem connector should be perpendicular to the legs of

the actuator yoke.

3. Refer to figure 8 for the feedback arm (key 88) location with respect to the connector bracket (key 87). Position the

feedback arm so that the pilot shaft (key 19A) will operate correctly in the slot of the feedback arm. For actuator

travels between 19 and 30 mm (0.75 and 1.18 inches), position the feedback arm so that the long portion of the

feedback arm slot, when fastened to the connector bracket, is closest to the positioner (see figure 8). For travels

greater than 30 mm (1.18 inches) reverse the feedback arm so the slot in the feedback arm is opposite the

positioner (see figure 8).

4. Attach the feedback arm (key 88) to the connector bracket (key 87) using machine screws, washers and hex nuts

(keys 91, 92 and 93), but do not tighten the hex nuts.

5. Unscrew the two machine screws (key 24), and remove the positioner cover (key 21).

6. As shown in figure 5, a thin knockout section is cast across the mounting hole in the housing. Check to make certain

that this knockout section has been removed. If the knockout section has not been removed, use a punch to knock

it out.

7. Set the actuator at mid‐travel using a manual loading regulator.

8. Install the stud clamp (key 83) in the mounting bracket (key 82). Place the mounting bracket against the outside of

the actuator leg. Attach the two U‐bolts (key 84) and the mounting bracket to the actuator leg using washers and

hex nuts (key 85 and 86), but do not tighten the nuts. Depending on the positioner action, it may be necessary to

straddle the travel indicator scale located on the inside of the actuator leg.

Note

Do not install the range spring in the following step. Feedback lever assembly (key 19) installation in the next step is only

temporary to permit verifying alignment.