Installation, Operation and Maintenance Manual
MAN 689 Rev. 6
June 2021
29
Maintenance
Section 5: Maintenance
5.2.1.2
Reassemble
1.
Assemble the new gasket (36) after cleaning the surfaces of housing (8) and head
flange (17) which are in contact.
2.
Assemble the head flange (17), replace the washers (37) if damaged, tighten the
screws (15) to the recommended torque.
3.
Lubricate the piston rod (20) surface, with a protective grease film and introduce it
into the head flange hole, take care not to damage the O-ring (39).
Carefully clean the threaded end of the piston rod (20) and the threaded hole of
the adaptor bush (30) of guide block (14). Spreads some sealant LOCTITE 452,
or equivalent, on the rod threaded end and screw into the adaptor bush (31)
threaded hole and tighten.
4.
Carefully clean the inside of the tube (19) and check that the entire surface,
particularly that of the bevels, is not damaged. Lubricate the inside surface of the
tube and the bevels at the ends. Slide the tube onto the piston taking care not to
damaged the piston O-ring (42) and the head flange O-ring (40).
5.
Assemble the end flange by centring it on the inside diameter of the tube, taking
care not to damage the O-ring (40).
6.
Assemble the washers (24) and the nuts (16) onto the tie rods (18). Tighten the
nuts to the recommended torque, alternating between opposite corners.
7.
Replace the gasket (25) if damaged and reassemble the hydraulic cylinder.
8.
Restore a generous coating of grease on the contact surfaces of the yoke (11) and
the bushings (34), on the yoke grooves, on the sliding blocks (5), on guide bar (9).
9.
Assemble the new gasket (10) after cleaning the surfaces of the housing (8) and
cover (1).
10.
Lubricate with protective oil or grease the O-ring (32).
11.
Assemble the cover (1) and the screws (2). Tighten the screws to the
recommended torque.
12.
Carry out a few actuator operations to check that its movement is regular and that
there is no air leakage through the seals.
NOTICE
After maintenance operations carry out a few actuator operations (5 - 10) to check that
its movement is regular, that there is no air leakage through the seals and to to eliminate
any oil residues in the air circuit, deriving from the lubrication of the seals during the
replacement phase.
