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RADIUS LLC
4922 Technical Drive
Milford, Mi 48381
SERIES A
OPERATION AND
INSTRUCTION MANUAL
DISASSEMBLY AND ASSEMBLY OF AN ACTUATOR
Although assembly and disassembly of an actuator is not recommended, in certain cases it might be
necessary to do so. For the disassembly and subsequent assembly of the actuator, follow the following
steps:
1.
Remove all the control accessories or any type of accessory that is attached to the actuator.
2.
Remove stop nuts (18) and the outside stops (19).
3.
Remove the internal screw stops (16).
4.
Unscrew and remove the cover bolts (15).
5.
Carefully remove the covers (5).
6.
The pistons (2) can be removed rotating the shaft (3) in counterclockwise direction.
7.
Remove retention ring (7) and nylon washer (6).
8.
Check that the shaft does not have any sharp edges that can damage the actuator’s body. If it does not
have sharp edges, remove the piston from its bore.
To reassemble the actuator it is necessary to perform the following steps:
1.
When replacing the O-Rings, care must be taken to insure that all the parts are completely clean and
that all the seal seats are lightly greased.
2.
The gears, the spring bores, and the springs themselves must be abundantly greased before assembling.
3.
Replace the shaft (3) in its bore; subsequently insert the pistons (2). When mounting an actuator, the
side where the NAMUR valve is mounted should be facing you.
4.
Do not engage the pistons until the groove on the upper side of the shaft (3) is correctly aligned. This
groove on the upper part of the shaft must form a 45° angle to the right, with each of the two axis of
the plane that forms the upper part of the actuator.
5.
Simultaneously push the piston (2) into the body (1) to insure that the rack and pinion engage
correctly. The shaft will then rotate in a clockwise direction.
