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Instruction Manual
D104496X012
3. Remove the upper diaphragm casing (key 1, figure 7) as outlined in the Maintenance section.
4. Remove the cap screws (keys 141) and separate the travel stop assembly from the upper casing.
5. Remove and inspect the O‐rings (key 139); replace if necessary.
6. For all actuator sizes: Loosen the stop nut (key 54), then unscrew the travel stop stem (key 133) out of the actuator
stem. The lower diaphragm plate can now be removed.
Assembly for Casing‐Mounted Travel Stop
1. Reassemble the up or down travel stop in the reverse order of the disassembly steps, being sure to apply lithium
grease as shown by the lubrication boxes (key 241) in figures 7 or 9 as appropriate.
2. Readjust the travel stop to obtain the appropriate restriction by following the adjustment procedures presented in
the introductory portion of the Casing‐Mounted Adjustable Travel Stops section. Return the unit to operation.
657C Actuator (40i, 46i, and 60i)
November 2019
17
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