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July 2020
Installation, Operation and Maintenance Manual
MAN616_EAC Rev. 5
Section 5: Maintenance
Maintenance
5.2.1 Replacement of Cylinder Seals
Refer to the following sectional drawing.
1. Measure the protrusion of the stop screw (26) with reference to the end ange (22)
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 lock nut (25) and unscrew the stop screws (26) until it is removed from
the end ange (22) together with the nuts (25).
3. Unscrew the nuts (16) from the tie rods (18) from the side of the end ange:
they must be gradually unscrewed all at the same time.
4. Slide off the end ange (22) and the tube (19).
5.2.1.1 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 grease lm.
Assemble the new O-ring into its groove and lubricate it with a protective grease lm.
1. Replace the O-ring (47) of the head ange (17).
2. Replace the O-ring (49) and the guide sliding ring (48) of the piston (21).
3. Replace the O-ring (47) of the end ange (22).
4. Remove the sealing washer (50) from the stop screw (26). Carefully clean and
lubricate the stop screw thread and the surface of the end ange area, on which the
sealing washer is.
5. Screw the new sealing onto the stop screw until it touches the nut (25).
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