July 2020
Installation, Operation and Maintenance Manual
MAN 573 Rev. 8
5.2 Extraordinary Maintenance
If there are leaks in the pneumatic 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.
5.2.1 Replacement of Cylinder Seals
(Refer to Table on page 30)
NOTICE
Before carrying out any maintenance operation, it is necessary to close the pneumatic feed line
and exhaust the pressure from the actuator cylinder and from the control unit, to ensure safety of
maintenance staff.
Installation, commissioning and maintenance and repair works should be carried out by
qualied staff.
Before carrying out any operation, cut power off from the electrical line.
Replacement of cylinder seals
(see Sectional drawing)
1. Measure the protrusion of the stop screw (30) with reference to the end ange (4) surface,
so as to be able to easily restore the setting of the actuator mechanical stop, once the
maintenance procedures have been completed.
2. Loosen the locknut (10) and unscrew the stop screw (30) together with the nut (10),
the washer (28) and the sealing washer (17).
3. Unscrew the nuts (25) from the tie rod (14) from the side of the end ange: they must be
gradually unscrewed all at the same time.
4. Slide off the end ange (4) and the tube (13). The spacer tube (33) must remain in place.
Take care not to damage the plane surfaces of the tube ends.
Maintenance22
Section 5: Maintenance
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