HLA
– Double acting- hydraulic linear actuator
Use and maintenance manual
© Copyright by BIFFI Italia. All right reserved.
Pag. 31
Contents may change without notice
2) Clean the groove carefully and lubricate it with a protective oil or
grease film.
3) Assemble the new O-ring into its groove and lubricate it with a
protective oil or grease film.
4) Assemble the new Teflon seal ring (18) 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.
Reassembly :
1) Assemble the head flange (5), replace the washers if damaged.
2) Lubricate the piston rod (3) surface, with a protective oil or grease
film and introduce it into the head flange hole, taking care not to
damage the O-ring (16). Carefully clean the threaded end of the
piston rod (3) and the threaded hole of the adaptor. Spread some
sealant LOCTITE 452, or equivalent, on the rod threaded end and
tighten.
3) Carefully clean the inside of the tube (7) and check that the entire
surface, particular that of the bevels, is not damaged. Lubricate
with a protective oil or grease 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 (18): the tube bevel has to
smoothly compress the seal ring; take care also not to damage the
head flange O-ring (16).
4) Assemble the end flange by centring it on the inside diameter of
the tube, taking care not to damage the O-ring (16).
5) Assemble the nuts (9) onto the tie rods (8). Tighten the nuts to the
recommended torque, alternating between opposite corners.
6) Screw the stop screw (2) by turning it clockwise with an Allen
wrench until it reaches its original position (the same distance with
reference to the end flange surface).
7) Screw the plug (12) into the cylinder end flange.
Carry out a few operations (Sect. 3) to check there are
no leakages from the gaskets.
