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Installation, Operation and Maintenance Manual
VCIOM-15792-EN Rev. 0
October 2020
Section 5: Maintenance
Maintenance
1.
Unscrew the plug (30) from the adjusting screw cover (22).
2.
Remove the adjusting screw cover (22) together with the O-ring (20).
3.
Measure the distance of the protrusion of adjusting screw (21) with reference to the
end flange (19) surface, so as to be able to easily restore the setting of the actuator
mechanical stop, once the maintenance procedures have been completed.
4.
Loosen the stop screw (21) until it is removed from the end flange (19).
5.
Unscrew the nuts (28) from the tie rods (16) from the side of the end flange:
they must be gradually unscrewed all at the same time.
6.
Slide off the end flange (19) and the tube (14).
Seals replacement
Prior to reassemble check that the actuator components are in good conditions and clean.
Lubricate all the surfaces of the parts, which move in contact with other components, by
recommended grease (AGIP-ENI LCX 2/32 if seals are in NBR/Viton or Neoprene rubber,
or with Aeroshell Grease 7 if the seals are in Fluorosilicon rubber). If the O-ring must be
replaced, remove the existing one from its groove, clean the groove carefully and lubricate
it with protective oil or grease film. Assemble the new O-ring into its groove and lubricate it
with a protective oil or grease film.
1.
Replace the O-ring (25) of the head flange (12).
2.
Replace the O-ring (26) and the guide sliding ring (27) of the piston (18).
Replace the O-ring (25) of the end flange (19).
3.
Remove the O-ring (20) from the stop screw cover (22). Carefully clean and
lubricate the stop screw thread and the surface of the end flange area, on which the
sealing works.
4.
Screw the new sealing onto the stop screw
5.2
Extraordinary Maintenance
If there are leaks in the hydraulic cylinder, 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 10)
NOTICE
Before executing any maintenance operation, it is necessary to intercept the supply line
and discharge pressure from the cylinder of the actuator.
