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Fisher
™
657 Diaphragm Actuator
Sizes 30/30i through 70/70i and 87
Contents
Introduction 1.................................
Scope of Manual 1.............................
Description 2.................................
Specifications 2...............................
Educational Services 3.........................
Instructional Videos 3..........................
Installation 3..................................
Mounting the Actuator on the Valve 4............
Discussion of Bench Set 5.......................
Spring Verification 6...........................
Installing the Stem Connector Assembly 7.........
Friction Discussion 9...........................
Deadband Measurement 10.....................
Loading Connection 10.........................
Maintenance 11................................
Actuator Maintenance 11.......................
Top‐Mounted Handwheel Assembly 13...........
Side‐Mounted Handwheel for Sizes 34/34i
through 60/60i Actuators 15..................
Side‐Mounted Handwheel for Sizes 70
and 87 Actuators 17.........................
Casing‐Mounted Adjustable Travel Stops 19.......
Parts Ordering 22...............................
Parts Kits 22...................................
Kits for Side‐Mounted Handwheels 22............
Kits for Top‐Mounted Handwheels 22.............
Parts List 23...................................
Actuator Assembly (figures 6, 7, 8, 9, or 10) 23.....
Figure 1. Fisher 657 Actuator Mounted
on an easy‐e™ Valve
X1175
Top‐Mounted Handwheel (figures 11 or 12) 23.....
Side‐Mounted Handwheel (figure 13 or 17) 26.....
Casing‐Mounted Adjustable Up Travel Stops
(figures 18 or 19) 31.........................
Casing‐Mounted Adjustable Down Travel Stops
(figure 20) 32..............................
Introduction
Scope of Manual
This instruction manual provides information on installation, adjustment, maintenance, and parts ordering for the
Fisher 657 actuator in sizes 30/30i through 70/70i and size 87. The 657‐4 actuator in sizes 70/70i and 87 is also
covered. Refer to separate instruction manuals for information about the valve positioner and other accessories used
with these actuators.
Do not install, operate, or maintain a 657 actuator without being fully trained and qualified in valve,actuator, and
accessory installation, operation, and maintenance. To avoid personal injury or property damage, it is important to
carefully read, understand, and follow all the contents of this manual, including all safety cautions and warnings. If you
have any questions about these instructions, contact your Emerson sales office
or Local Business Partner before
proceeding.
Instruction Manual
D100306X012
657 Actuator (30/30i-70/70i and 87)
June 2018
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