OLGAS-H
– High pressure spring return hydraulic actuator
Use and maintenance manual
© Copyright by BIFFI Italia. All right reserved.
Pag. 38
Contents may change without notice
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 (51) 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 damaged the seal. Then
enlarge the seal ring with your fingers so as to restore its round
shape: pay attention not to utilise any tools, which can damage the
seal ring.
To replace the piston seal ring (53) proceed as follows :
1) Remove the existing Teflon seal ring (51) 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 (51) 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 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.
Reassemble :
1) Assemble the new gasket (46-48) after cleaning the surfaces of
housing (8), the flange (47) and head flange (34) which are in
contact.
2) Assemble the head flange (34), replace the washers if damaged,
tighten the screws (17) to the recommended torque.
3) Lubricate the piston rod (18) surface, with a protective oil film and
introduce it into the head flange hole, taking care not to damage
the O-ring (48). Carefully clean the threaded end of the piston rod
(18) and the threaded hole of the adaptor bush (33) of guide block
(14). Spread some sealant Loctite 452, or equivalent, on the rod
threaded end and tighten.
4) Carefully clean the inside of the tube (22) and check that the entire
surface, particularly that of the bevels, is not damaged. Lubricate
with a protective oil film the tube internal surface and the bevels at
the ends. Slide the tube onto the piston taking care not to
damaged the Teflon seal ring (53): the tube bevel has to smoothly
compress the seal ring; take care also not to damage the head
flange O-ring (50).
