7-3
7-1-2. Disassembly and Assembly of Top Handwheel
To disassemble or assemble the top handwheel, refer to Figure 7-1 through Figure 7-3 and
proceed as described in this section. For disassembly work, keep the actuator in the vertical
attitude.
(a) Direct action type
(1) Disconnect the air piping.
(2) Set the handwheel shaft in the automatic operation position (fully raise the handwheel
shaft).
(3) Remove the top diaphragm case. When doing this, loosen the pair of eyebolts uniformly
and alternately, after removing all other clamping-bolts of the diaphragm case.
(4) Sufficiently insert the handwheel shaft by turning it and then remove the handwheel and
the lock nut. Insert the shaft further and then remove the screw shaft from the housing.
(5) Remove the O-ring.
To assemble the top handwheel, follow the disassembly procedure in the reverse order.
(b) Reverse action type
(1) Disconnect the air piping.
(2) Set the handwheel shaft in the automatic operation position (fully lower the handwheel
shaft).
(3) Remove the handwheel and the lock nut. Insert the shaft into the housing by means of the
threading until the threaded sections are disengaged.
(4) Remove the top diaphragm case. When doing this, loosen the pair of eyebolts uniformly
and alternately, after removing all other clamping-bolts of the diaphragm case.
(5) Remove the housing by loosening its clamping-screw.
(6) Remove the setscrew and then remove the bearing case.
(7) Remove the spring pin and then remove the castle nut.
(8) Remove the bearing retainer and then remove the bearing.
To assemble the top handwheel, follow the disassembly procedure in the reverse order.
(c) Inspection after assembly
(1) Check that the handwheel turns smoothly for the fun stroke.
(2) For the direct action type of actuator, check by means of soapsuds that there is no air leak
from the connecting section of the top diaphragm case.
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