I
MO-D52/R52
16
9/21 Rev. 0
Disassembling the actuator
See Fig. 8 and 9 for circled part numbers.
Take care not to damage the diaphragm front/rear surfaces and the actuator rod surface during
disassembly work.
Do not disassemble the assembly of the diaphragm and actuator rod unless any anomaly is found in
a visual inspection of the following parts.
Parts to be inspected: The diaphragm front/rear surfaces and the actuator rod surface.
(1)
Removing the accessories
When the accessories are mounted on the actuator, remove the air piping and electric wiring
carefully and then the device itself.
(2)
Disassembly of the direct-action type
•
Do not loosen the hex nuts 122 to which the hanging ring 115 is attached. Loosen the other
hex nuts 122 and remove the hex bolts 121.
•
Loosen the hex nuts, which fasten the two long hex bolts 140, equally and remove these two
bolts. These two pieces each of long hex bolts and nuts set the initial load of the spring.
When these hex bolts are removed, the spring is at free length.
•
Remove the diaphragm upper case 102.
•
In this state, pull out the diaphragm/actuator rod assembly (the diaphragm 108, the
diaphragm 104, the actuator rod 106, the center plate 111 and the hex bolt 123) from the guide
holder 107.
•
Remove the springs 109, the stopper 105 and the spring sheet 110.
When disassembling the diaphragm/actuator rod assembly, follow the instructions shown below.
•
The joint between the hex bolt 123 and the actuator rod is coated with screw lock to prevent
from loosening. For loosening the hex bolt, tighten the double hex nut on the threaded portion of
the actuator rod for mounting the connector and loosen the hex bolt while fixing that nut with a
spanner wrench. And then the diaphragm/actuator rod assembly can be disassembled.
•
When the hex bolts 125 are loosened and removed, the diaphragm lower case 103, the
spring washers 126 and the guide holder can be separated from the yoke 101.
Disassembly is completed with the above procedures. Check all the parts and replace them with new
parts when any damage is found with them.
(3)
Disassembly of the reserve action type
•
Do not loosen the hex nuts 122 to which the hanging ring 115 is attached. The hex bolts 140
with the handing rings 115 are longer than the other hex bolts 121. Loosen the other hex nuts
122 and remove the hex bolts 121.
•
Loosen the hex nuts, which fasten the two long hex bolts 140, equally and remove these two
bolts. These two pieces each of long hex bolts and nuts set the initial load of the spring. When
these hex bolts are removed, the spring is at its free length.
•
Remove the diaphragm upper case 102.Remove the spring and the spring seat 110.
•
In this state, pull out the diaphragm/actuator rod assembly (the diaphragm 108, the diaphragm
plate 104, the actuator rod 106, the center plate 111, the stopper 105, the hex bolt 123 and the
spring washer or the hex nut 124) from the guide holder 107.
•
Follow the instructions shown below for disassembling the diaphragm/actuator rod
assembly.
•
Threaded joint of the Diaphragm plate 104 and the actuator rod 106. Loosen the hex nut
124 and remove the hex bolt 123. Using a vise to hold the diaphragm plate, remove the hex
