32
February 2022
Installation, Operation and Maintenance Manual
MAN 607 Rev. 6
Section 5: Maintenance
Maintenance
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 following general sectional drawing and
adopting the following procedures:
5.2.1
Replacement of High Pressure Cylinder Seals
(Refer to the following parts list drawing)
!
WARNING
Before executing any maintenance operation, it is necessary to intercept the supply line
and discharge pressure from the cylinder of the actuator.
Replacement of cylinder seals
1.
Unscrew the plug (27) from the cylinder end flange.
2.
Measure the distance of the stop screw (23) with reference to the end flange (26)
surface, so as to be able to easily restore the setting of the actuator mechanical
stop once the maintenance procedures have been completed.
3.
Unscrew the stop screw (23) by turning it anticlockwise with an Allen wrench until
the screw is completely withdrawn inside the end flange threaded hole.
4.
Unscrew the nuts (28) from the tie rods (19); they must be gradually unscrewed all
at the same time.
5.
Slide off the end flange (26) and the tube (22).
6.
If the actuator control unit requires the cylinder chamber head flange side to be
also filled with oil, and the piston rod seal ring (44) to be replaced, remove the
screw (2) and the cover (1). Unscrew the piston rod (18) threaded end from the
adaptor bush (32) of the guide block (14). Slide off the piston rod (18) from the
head flange (33).
7.
Disassemble the head flange (33) from the mechanism housing (8) by removing
the screw (17) only if the gasket (39) and (41) have to be replaced because
of damage.
