13
Replacement of mechanism seals
To replace the O-rings of the shaft (6) proceed
as follows:
1. Remove the retainer ring (21).
2. Disassemble the shoulder washer (8).
Remove the existing O-ring (23) from its
groove. Clean the groove and the shaft
carefully and lubricate it with protective oil
film.
3. Assemble the new O-ring into its groove and
lubricate it with protective oil or a grease
film. Assemble the shoulder washer (8).
Assemble the retainer ring (21).
If the sealing washer (17) has to be replaced,
measure the protrusion of the stop screw
(30) with reference to the housing (1) surface,
so as to be able to easily restore the setting
of the actuator mechanical stop, once the
maintenance procedures have been completed.
1. Loosen the lock nut (10) and remove the
stop screw (30) together with the nut (10),
the washer (28) and the sealing washer
(17). Remove the sealing washer (17) from
the stop screw (30). Carefully clean and
lubricate the stop screw thread and the
surface on the housing area, where the
sealing washer is.
2. Screw the new sealing washer onto the stop
screw until it is in contact with the nut (10).
Assemble the washer (28) onto the sealing
washer (17).
3. 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).
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.
1. 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.
2. Screw the new sealing washer onto the
screw until it is in contact with the nut (26).
3. Assemble the washer (27) onto the sealing
washer (18).
4. 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).
5. Check that the sealing washer (18) and the
washer (27) are in contact with the housing
surface. Tighten the lock nut (26).
IMPORTANT
AFTER MAINTENANCE OPERATIONS CARRY OUT
A FEW ACTUATOR OPERATIONS TO CHECK THAT
ITS MOVEMENT IS REGULAR AND THAT THERE
IS NO AIR LEAKAGE THROUGH THE SEALS.
RPS SPRING RETURN PNEUMATIC ACTUATOR
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
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