8
• Clean the machined stem nut.
• Apply ball bearing grease to the thrust bearing and races and place them on the stem nut.
• Put the stem nut into the mounting flange. Be careful that the dogs are placed correctly in the slots
of the hollow shaft.
• Screw in the bearing lock nut until it is firm against the shoulder.
• The A drive housing is provided with a grease nipple for lubrication. Ensure that an adequate
amount of grease is provided for proper operation. Frequency of lubrication must be determined
according to usage. Contact the factory for further information on output drives.
14. MAINTENANCE
AUMA Actuators need little maintenance. A precondition for reliable service is correct commissioning
and start up. It is also very important that the O-rings for the covers are placed correctly, and conduit
entries are fastened firmly to prevent the ingress of dirt or water.
We recommend:
• If operated very seldom, perform a test run every six (6) months. This assures that the actuator is
always ready to operate.
• Approximately six (6) months after start-up and then every year check the bolts between the
actuator and the valve/gearbox for tightness. If required, retighten.
• Multi-turn actuators with Form A output drive must be lubricated at intervals of approximately six (6)
months, using the grease nipple.
CAUTION: Lubrication of the valve stem must be done separately.
This operation instruction has been prepared to the best of our knowledge in order to inform our
customers. It is the result of our practical experience and extensive testing.
Our multi-turn actuators were designed principally for the operation of valves. Before using them for
other purposes, we recommend examining whether our products perform the functions desired.
Further knowledge about their suitability may be obtained by tests. We are prepared to assist in the
performance of these tests.
For special applications please consult factory.
When using our multi-turn actuators for applications not intended by us, we cannot be held
responsible. Necessary precautions to prevent injury to persons or damage to materials are the sole
responsibility of the user.
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