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Instruction Manual
D100306X012
Note
If repeated or daily manual operation is expected, the actuator should be equipped with a side‐mounted handwheel rather than a
casing‐mounted travel stop or top‐mounted handwheel.
The side‐mounted handwheel is designed for more frequent use as a manual operator.
Figure 2. Schematic of Fisher 657 and 657‐4 Actuators
AF3833‐A
A0792‐2
Specifications
Refer to table 1 for Specifications of the 657 and 657‐4 actuators. See the actuator nameplate for specific information
about your actuator.
Installation
Key number locations are shown in figures 6, 7, and 8, unless otherwise indicated. Also, refer to figure 3 for location of
parts.
WARNING
Always wear protective gloves, clothing, and eyewear when performing any installation operations to avoid personal
injury.
Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
If installing into an existing application, also refer to the WARNING at the beginning of the Maintenance section in this
instruction manual.
AIR PUSHES
STEM DOWN
SPRING LIFTS
STEM UP
STEM
657 Actuator (30-70 and 87)
December 2010
3
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