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MAN 604A Rev. 5
Maintenance
Section 5: 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 screw (26) until it is removed
from the end ange (22) together with the nut (25), the washer (51) and the
sealing washer (50).
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).
6. Assemble the washer (51) onto the sealing washer.
June 2020
Installation, Operation and Maintenance Manual
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