Emerson 1051 Instruction Manual page 15

Instruction Manual
Form 5587
November 2006
attached output shaft (key 87) from the actuator
housing (key 20).
f. If necessary, remove the retaining ring (key 88)
and slide the mounting bracket or mounting plate
off the output shaft.
8. Check the bearing (key 67) in the mounting
bracket or mounting plate (key 22). Press out and
replace the bearing if necessary.
9. Heat the hex nut (key 19) to 177_C (350_F) long
enough for the thread-locking adhesive (high
strength) (key 77) to lose its holding strength. Then,
remove the cap screw and hex nut (keys 18 and 19),
and remove the lever (key 27) from the housing.
10. Rotate the handwheel (if one is used)
counter-clockwise until the handwheel is not
compressing the spring (key 11).
WARNING
To avoid personal injury from
precompressed spring force suddenly
thrusting the upper diaphragm casing
(key 1) away from the actuator, relieve
Type 1052 spring compression, or
carefully remove Type 1051 casing cap
screws by following the instructions
presented in the next two steps before
proceeding further.
11. To relieve Type 1052 spring compression, insert
a round rod into one of the slots in the lower bearing
seat (key 73). Slot diameter is 9.5 mm (3/8 inch) for
size 40 actuators, 15.9 mm (5/8 inch) for size 60
actuators, and 19.1 mm (3/4 inch) for size 70
actuators. Use the rod to rotate the lower bearing
seat, and move it away from the actuator casings.
Continue rotating the lower bearing seat until spring
compression is completely removed.
12. Loosen, but do not remove, all casing cap
screws (key 5). Make sure there is no spring force
on the Type 1051 upper diaphragm casing. Unscrew
and remove the cap screws and hex nuts (keys 5
and 6), and then remove the upper diaphragm
casing and the diaphragm (key 3).
13. Proceed as appropriate:
For Type 1051 actuators,
a. Read and follow the warning printed on the
nameplate (key 56) located on the diaphragm
plate (key 4).
1051 & 1052 H & J
b. Pull the diaphragm plate (key 4) and attached
parts out of the actuator. The spring (key 11),
diaphragm rod (key 10), cap screw (key 9), spring
seat (key 13), hex nut (key 58), turnbuckle
(key 57), hex nut (key 16), and rod end bearing
(key 17) will be attached to the diaphragm head.
WARNING
For Type 1051 actuators, the
diaphragm plate (key 4) may be
wedged against the diaphragm rod
(key 10), thereby preventing the spring
compression from being relieved as
the cap screw (key 9) is loosened.
Dislodge the diaphragm head from the
diaphragm rod by loosening the cap
screw (key 9) one full turn and tapping
the underside of the diaphragm head
until it follows the cap screw
disassembly. Failure to check for this
situation before removing the cap
screw (key 9) could cause personal
injury due to the sudden release of
spring compression as the cap screw
is disengaged.
c. Slowly remove the cap screw (key 9) while
making sure that the diaphragm head is following
the cap screw removal. Note that spring load will
be zero before the cap screw is completely
removed. Then separate the remaining parts of
the assembly.
For Type 1052 actuators,
a. Remove the rod end bearing (key 17), the hex
nut (key 16), the turnbuckle (key 57), and the hex
nut (key 58) from the diaphragm rod (key 10).
b. Pull the diaphragm plate (key 4) and attached
parts out of the actuator. Then remove the cap
screw (key 9) to separate the diaphragm plate
and the diaphragm rod.
c. Proceed as appropriate:
D For actuator designs without a set screw in
the spring barrel (key 12), remove the actuator
spring (key 11) from the actuator. If it is necessary to
remove the adjustor (key 74) from the spring barrel
during this procedure, heat the base of the adjustor
to 177_C (350_F) long enough for the thread locking
adhesive (high strength) (key 77) to lose its holding
strength. Then, unscrew the adjustor from the spring
barrel. If the spring seat and the lower bearing seat
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