39
Installation, Operation and Maintenance Manual
MAN 571_EAC Rev. 1
September 2020
Maintenance
Section 5: Maintenance
5.2.2
Replacing the Seals of the Cylinder
(Section 7.2 - Figure 35: Hydraulic Cylinder)
•
Measure the protrusion edge of the setting-screw (11) referred to the surface of
the end flange of the cylinder (13), so to easily restore the calibration (Section 3.4)
once the maintenance operations are over
•
Remove the locking screw protection (14) and unscrew the mechanical stop (11).
•
Unscrew the nuts (16) from tie rods (10) on the side of the end flange. Nuts should
be progressively unscrewed all together.
•
Remove the end flange (13) and the rod (12).
•
Remove the O-rings (3) from their seat in the head flange (2).
•
Properly clean the slot and lubricate it with protective oil or with a layer of grease.
•
Install a new O-ring (3) in the seat and lubricate again.
•
Remove the O-ring (19), the tightness ring of the piston (9)and the guide ring (8)
from their slots in the piston.
•
Properly clean the seat of the guide ring (8) and lubricate it with a lot of grease
so that it keeps the ring in its place at the moment in which the rod is put back
in place.
•
Properly clean the seat of the O-ring (19) and lubricate it with protective oil or
with a layer of grease.
•
Install a new O-ring (19) and the ring of the piston (9) in their seats and lubricate
them again.
•
Properly clean the interior of the rod (12) and check accurately the surface
is intact.
•
Lubricate the internal surface of the rod and the inlet chamfers.
•
Insert the rod on the piston of around half its length, paying attention not to
damage the O-ring (19). During this operation the guide ring of the piston,
passing, removes the grease from the rod surface: so lubrication should be
carried out.
•
Complete the axial motion of the rod until the head flange (2) of the cylinder
is reached paying attention not to damage the O-ring (3).
NOTICE
Carry out a few operations (Section 3.3) to check there are no leakages from the gaskets.
