Instruction Manual
D102602X012
657NS Actuator
November 2012
16
17. Lubricate the spring seat guide (key 36) and the appropriate area inside the spring case assembly (key 35) with
either a high-temperature, radiation-resistant, polyphenyl ether grease or lithium grease (key 54), as appropriate
for the installation.
18. Place the spring case assembly (key 35) on the upper diaphragm casing. Insert and tighten the cap screws (key 8)
to 102 N
S
m (75 lbf
S
ft).
19. Thread the adjustable travel stop (key 34) into the spring case (key 35) so that the travel stop is approximately 3.2
mm (1/8-inch) from the actuator stem (key 10) when the stem is in the extreme upward position. Thread the hex
locknut (key 50) against the spring case, and lock it securely against the spring case.
20. Mount the actuator, and make the stem connection by following the procedure in the Actuator Mounting section.
Parts Ordering
Each actuator has a serial number stamped on the nameplate. Always refer to this serial number when corresponding
with your Emerson Process Management sales office regarding replacement parts or technical information.
WARNING
Use only genuine Fisher replacement parts. Components that are not supplied by Emerson Process Management should
not, under any circumstances, be used in any Fisher valve, because they may void your warranty, might adversely affect the
performance of the valve, and could cause personal injury and property damage.
