33
Installation, Operation and Maintenance Manual
MAN 607 Rev. 6
February 2022
Section 5: Maintenance
Maintenance
Seals replacement
Prior to reassemble, check that the actuator components are in good condition and
is clean. Lubricate all the surfaces of the parts, which move in contact with other
components, by recommended oil
(SHELL OMALA S4 WE 320 or equivalent)
. If the
O-ring must be replaced, remove the existing one from its groove, clean the groove
carefully and lubricate it with protective oil film. Assemble the new O-ring into its groove
and lubricate it with a protective oil film.
1.
Replace the O-ring (43) of the head flange (33).
2.
Replace the O-ring (42) of the end flange (26).
To replace the piston rod seal rings (44), proceed as follows:
1.
Remove the existing Teflon seal ring (44) with its O-ring from their groove.
2.
Clean the groove carefully and lubricate it with a protective oil film.
3.
Assemble the new O-ring into its groove and lubricate it with a protective oil film.
4.
Assemble the new Teflon seal ring (44) into the flange groove, inside its rubber
O-ring, by bending it; take care that the bending radius is as large as possible to
avoid damaging the seal. Then, enlarge the seal ring with your fingers so as to
restore its round shape; pay attention not to utilize any tools which can damage
the seal ring.
To replace the piston seal ring (46), proceed as follows:
1.
Remove the existing Teflon seal ring (46) with its O-ring from their groove.
2.
Clean the groove carefully and lubricate it with a protective oil film.
3.
Assemble the new O-ring into its groove and lubricate it with a protective oil film.
4.
Assemble the new Teflon seal ring (46) on its rubber O-ring by introducing one
side of it into the groove, then enlarge it with your fingers so as to fit it into the
groove: take care to enlarge it uniformly without using any tools which could
possibly damage it. The elastic memory of the kind of Teflon the seal ring is made
of allows the ring to shrink back to its previous dimension after a short time.
