Installation, Operation and Maintenance Manual
MAN 608 Rev. 5
December 2020
Maintenance
stop-setting screw cover
stop-setting screw
plug
c1
c2
c3
31
Section 5: Maintenance
Figure 25
5.2
Extraordinary Maintenance
If there are leaks in the hydraulic cylinder, or a malfunction in the mechanical components,
or in case of scheduled preventive maintenance, the actuator must be disassembled and
seals must be replaced with reference to the follow general sectional drawing and adopting
the following procedures:
!
WARNING
If the actuator can be operated, it is essential to take it to fail safe position, with the spring
totally extended, otherwise the actuator should be disassembled from the valve and follow
these steps.
•
Remove the plug from the cover of the adjustment screw (23).
•
Record the length between end flange and stop-setting screw, as in Figure 25
(for MHP version).
•
Bring the adjustment screw back to the maximum (20) to let the spring loosen.
!
WARNING
Before disassembling the cylinder, make sure the above operation of spring release is done.
