Emerson Process Management 1051 - Manual (Page 27)

Instruction Manual
D100320X012
1051 and 1052 H & J Actuators
October 2012
27
WARNING
To avoid personal injury from the precompressed spring force thrusting the upper diaphragm casing (key 1, figures 12 and
13) away from the actuator, either relieve 1052 spring compression, or carefully remove 1051 casing cap screws by
following the instructions that are referenced in the steps below before removing the casing.
2. Relieve all actuator spring compression by following the procedures presented in the Disassembly portion of the
Maintenance section. Then, rotate either the handwheel (key 51, figure 15) or the travel stop stem (key 133, figures
16 and 17) counterclockwise until the handwheel or travel stop assembly is no longer compressing the spring.
3. Proceed as appropriate:
For Top-Mounted Handwheels and Adjustable Up Travel Stops
a. Remove the upper diaphragm casing (key 1, figures 12 and 13) by following steps 1, 3, 6, 7, 9, 11, and 12 of the
Disassembly portion of the Maintenance section.
b. Remove the cap screws (key 141, figures 15 and 16, and separate the assembly from the upper casing.
c. Loosen the locknut (key 137, figure 15) or remove the closing cap (key 187, figure 16).
d. Turn the stem (key 133, figures 15 and 16) clockwise out of the body. On handwheel assemblies, the cotter pen
and slotted nut (keys 247 and 54, figure 15) will have to be removed so that the handwheel (key 51, figure 15)
and locknut can be taken off the stem first.
e. Remove and inspect the O-rings (keys 138 and 139, figures 15 and 16); replace them if necessary.
f. To complete disassembly for sizes 40 and 60, drive out the groove pin (key 140, figures 15 and 16), and slide the
pusher (key 135, figures 15 and 16) off the stem. The pusher of a size 70 unit is held to the stem by a retaining
screw (key 174, figures 15 and 16). Removing the retaining screw and pusher exposes the thrust bearing (key
175, figures 15 and 16) for inspection.
For Adjustable Down Travel Stops
Refer to figure 17 for appropriate key numbers unless otherwise stated.
a. Remove the closing cap (key 187), and unscrew the jam nut and hex nut (keys 189 and 63 for sizes 40, and 70
actuators; or keys 189 and 54 for size 60 actuators) off the stem (key 133).
b. Remove the upper diaphragm casing (key 1, figures 12 and 13) and travel stop body (key 142) by following steps
1, 3, 6, 7, 9, 11, and 12 of the Disassembly portion of the Maintenance section.
c. Unscrew cap screws (key 141), and remove the body from the diaphragm case.
d. Check the condition of the O-ring (key 139), and replace it if necessary.
e. Loosen the hex nut (key 54), and then unscrew the travel stop stem (key 133) out of the actuator stem. The
lower diaphragm plate (key 82) can now be removed and the rest of the actuator disassembled.
4. Reassemble by reversing the order of the steps you took to disassemble, being sure to apply lubricant as previously
mentioned and as shown by the lubrication boxes (key 241) in figures 15 and 16. For size 70 handwheels or up
travel stop assemblies, coat the threads of the retaining screws (key 174, figures 15 and 16) with thread-locking
adhesive (high strength) (key 242).