User Instructions
MAN-02-04-60-0350-EN Rev. 3 February 2019
68
Section 11: Maintenance
Maintenance
11.1 Service/Exchange of Spindel Nut and
Axial Bearing
This service must be performed at regular intervals, depending on the operating mode:
Modulating operating mode: 5 years Open/Close operating mode: 10 years
The following procedure is to be observed. The assignment of the components can be
found in Figure 2:
1. If necessary, disassemble the actuator from the valve.
2. Disconnect the actuator from the linear unit.
3. Loosen the small worm screw in the ring nut.
4. Unscrew the ring nut from the output ange using a mortise key.
5. Remove the spindle nut and the two axial bearings.
6. Wash and clean them and remove all grease from the output ange.
7. Grease the cleaned or new components and reinsert them in the output ange in
the order axial bearing, spindle nut and axial bearing.
8. Insert the ring nut again and turn it with the mortise key until it stops.
9. Turn the ring nut back a quarter turn, hold it with mortise key and x the worm
screw to secure the ring screw against twisting.
10. The ring nut must now no longer be able to turn with the mortise key.
11.2 Moving Interval
The linear unit should be actuated at least every 3 months.
11.3 Greasing Interval
Every 6 months the linear unit should be re-greased via the greasing nipples .
Actuators are designed for installation in any position (see Section 2.5).
Therefore, the main body is not equipped with a level indication or a drain plug.
The replacement of the lubricant from the main body must be performed via
the handwheel.
Every approx. 10,000-20,000 hours (about 5 years - 15), depending on the workload,
you must:
• Change Oil
• Replace seals
• Check all roller bearings and the worm-wheel assembly and replace if necessary
• Check our lubricants table for recommended oils and greases. (see Section 15)
CAUTION: REGULAR CHECK OF CABLE GLANDS
Check the cable glands at regular intervals (annually) for tightness of the cables and
retighten if necessary.
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