July 2020
Installation, Operation and Maintenance Manual
MAN 575 Rev. 4
24
Maintenance
Section 5: Maintenance
7.
Screw the stop screw into the threaded hole of the housing until it reaches its
original position (the same protrusion with reference to the housing surface).
Check that the sealing washer (17) and the washer (28) are in contact with the
housing surface. Tighten the lock nut (10).
8.
If the sealing washer (18) has to be replaced, measure the protrusion of the thrust
bearing screw (15) with reference to the housing (1) surface, so as to be able to
easily restore the setting of the position of the thrust bearing sliding block with
reference to the rack once the maintenance procedures have been completed.
9.
Loosen the lock nut (26) and remove the screw (15) together with the sliding
block (19), the nut (26), the washer (27) and the sealing washer (18). Remove the
sealing washer (18) from the screw (15). Carefully clean and lubricate the screw
thread and the surface of the housing area, where the sealing washer is.
10.
Screw the new sealing washer onto the screw until it is in contact with the nut (15).
Assemble the washer (27) onto the sealing washer (18).
11.
Screw the thrust bearing screw (15), complete with the sliding block (19), into
the threaded hole of the housing until it reaches its original position (the same
protrusion with reference to the housing surface).
12.
Check that the sealing washer (18) and the washer (27) are in contact with the
housing surface. Tighten the lock nut (26).
NOTICE
After maintenance operations carry out a few actuator operations to check that its move-
ment is regular and that there is no air leakage through the seals.
