May 2012
Service Instructions
137465E Rev. F
5
Section 2: Actuator Disassembly
Actuator Disassembly
Section 2: Actuator disassembly
2�1 General disassembly
WARNING: DANGEROUS GAS AND/OR LIQUIDS
It is possible, that the actuator may contain a dangerous gas and/or liquids. Ensure that all
proper measures have been taken to prevent exposure or release of these types of contami-
nants before commencing any work.
CAUTION: PRESSURE
Pressure applied to the actuator is not to exceed the maximum operating pressure rating
listed on the actuator name tag.
NOTE:
Before starting the general disassembly of the actuator it is a good practice to operate
actuator with the pressure used by the customer to operate the actuator during normal
operation. Notate and record any abnormal symptoms such as jerky or erratic operation.
2.1.1 Remove all operating pressure from actuator, allowing the spring to stroke. The
spring will rotate the yoke to its fail position.
2.1.2 Record the settings of stop screw / ES / M3 jackscrews (1-70) and stop screw / ES
(4-30) before they are loosened or removed.
NOTE:
In place of stop screws the actuator may be equipped with one or two ES (ES = Extended
Stops) or one M3/M3HW (1-70) located on outboard end of housing (1-10).
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