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cator scale (key 35) must first be removed by remov-
ing the self-tapping screws (key 36). Mark the
orientation of the travel indicator scale on the cover
before removing it.
CAUTION
When removing the actuator from the
valve body, do not use a hammer or sim-
ilar tool to drive the lever (key 27) or ac-
tuator off the output shaft (key 87). Driv-
ing the lever or actuator could damage
operated equipment. For valves, driving
the lever (key 27) could move the valve
disk and bearings away from the cen-
tered position causing subsequent dam-
age to valve parts.
If necessary, use a wheel puller to re-
move the lever. It is permissible to tap
the wheel puller screw lightly to loosen
the lever, but hitting the screw with ex-
cessive force could also damage oper-
ated parts or disrupt the centered posi-
tion of a valve disk or other equipment.
6. For an actuator with an H mounting adaptation and
a 7/8 through 1-1/2 inch (22.2 through 38.1 mm) out-
put shaft, unscrew the cap screws (key 78) and re-
move the actuator from the operated equipment. Mark
the orientation of the lever (key 27) with respect to the
output shaft (key 87). This marking is used during
reassembly to allow for proper lever/output shaft posi-
tioning.
Then, loosen the cap screw (key 28) so that the output
shaft is free to slide off the lever. With the lever and
output shaft properly marked, unscrew the cap screws
(key 23) and remove the mounting plate (key 22) and
output shaft (key 87) assembly from the actuator
housing (key 20). If necessary, remove the retaining
ring (key 88) and separate the output shaft from the
mounting plate. For 2-inch (50.8 mm) output shafts,
refer to step 7 for this procedure.
7. For an actuator with either a J mounting adaptation
(see figures 10 and 11), or an H mounting adaptation
with a 2-inch (50.8 mm) output shaft (see figure 12),
proceed as follows:
Remove the cap screws (key 78, not shown in figures
10 and 11) and remove the actuator from the operated
equipment. For an actuator with J mounting and a
1-1/3 or 1-1/2 inch (31.8 or 38.1 mm) valve shaft diam-
eter, two spacers (key 92, not shown in figures 10 and
11) are also removed with the cap screws (key 78).
When separating the output shaft (key 87) and cou-
pling (key 90) from the operated shaft, remember to
remove the woodruff key (key 91, not shown in figure
12) from the operated shaft keyway. Mark the orienta-
2. Trademark of Loctite Corp.
Type 1051 & 1052 Styles H & J
tion of the lever (key 27, figures 10 and 11) with re-
spect to the output shaft (key 87). This marking is
used during reassembly to allow for proper lever/out-
put shaft positioning, Then, loosen the cap screw (key
28, figures 10 and 11) so that the output shaft is free
to slide off the lever. With the lever and output shaft
properly marked, unscrew the cap screws (key 23)
and remove either the mounting yoke (key 22, figures
10 and 11 for J mounting) or the mounting plate (key
22, figure 12 for H mounting) plus the attached output
shaft (key 87) from the actuator housing (key 20). If
necessary, remove the retaining ring (key 88) and
slide the mounting yoke or mounting plate off the out-
put shaft.
8. Check the bearing (key 67) in the mounting yoke or
mounting plate (key 22). Press out and replace the
bearing if necessary.
9. Heat the hex nut (key 19) to 350 F (177 C) long
enough for the Loctite 271
(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).
To avoid personal injury from precom-
pressed 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 3/8 inch (9.5 mm) for
size 30 and 40 actuators, 5/8 inch (15.9 mm) for size
60 actuators, and 3/4 inch (19.1 mm) for size 70 ac-
tuators. 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 compres-
sion 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 re-
move 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,
(2)
thread-locking compound
WARNING
15
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