Servicing and maintenance
32
8
Servicing and maintenance
In this section, information is given to be followed for maintenance, cleaning and dis-
posing of DREHMO actuators.
8.1
Maintenance
We recommend participation in the regular training for performing maintenance tasks.
Basic special knowledge in electrical installation and mechanical engineering is suffi-
cient (in Germany: industrial training - apprenticeship). Permitted maintenance work:
• Replace handwheel
• Replace output drive
• Check oil level
In any case, the actuator has to be restored to the original state prior to continue using
it.
WARNING
Explosion hazard due to inexpert repair of flameproof joints!
Death or serious injury.
à Repairs on flameproof joints must only be performed by the manufacturer.
WARNING
Explosion protection due to inexpert handling of housing parts with
flameproof joints!
Death or serious injury.
à Opening of the mechanical interfaces available at the device with flameproof joints
may only be performed by the manufacturer or staff trained by the manufacturer!
NOTICE
Leaking of the actuator due to excessive lubricant.
à The actuators are lubricated for life.
à A fixture for permanent stem lubrication (output drive type A and A-HP) can be re-
quested from the manufacturer.
Correct commissioning is a prerequisite for reliable actuator operation. We recom-
mend checking the fixing screws between actuator and valve or gearbox for tightness
once a year.
Check open-close actuators for wear after a cumulated operating time of 150 hours,
modulating actuators, however, at the latest after 10
6
starts! For safe and reliable ser-
vice, we recommend – especially if infrequently operated – performing an actuator test
run every 6 months. Apply a thin layer of Molykote 165 LT to the threads of loosened
housing screws. Apply Klüber Isoflex Topas NB5051 to the sealing faces between the
housing parts.
For technical questions, please contact the DREHMO Service, indicating your device
number. The number can be retrieved from the actuator name plate. Only overhaul
defective actuators in the factory of the manufacturer or an authorised workshop.
8.2
Troubleshooting and corrective actions
A functional test is required after corrective maintenance. Commissioning of actuator/
valve must be performed if tripping parameters, valve or additional gearing have been
changed.
8.3
Oil filling
The actuator oil filling is specified for the actuator lifetime. It is an indispensable part of
the non electrical explosion protection of the device. For this reason, only oils ap-
proved by DREHMO GmbH may be used for the actuators. Actuators for ambient tem-
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