Maintenance; Oil Change - Vexve Hydrox HCU Basic Installation, Operation And Maintenance Manual

5. Maintenance

Hydrox control units need only little maintenance.
The correct choice of control unit, valve and actuator combination as well as careful installation,
commissioning and use significantly reduce any need for maintenance.
We recommend checking the following periodically to ensure long-term operational reliability, even
when seldom used (around ten times a year or less):
Approximately six months after commissioning and then once a year, check the functionality of the
control unit, inspect the control unit for oil leaks (carefully tighten if any leakages occurred) and ensure
the tightness of the hydraulic hoses between the control unit and actuator. Test also the functionality
of the position indication box.

5.1 Oil change

Oil changes are necessary and depend on the size of the system. Under clean conditions, it is
recommended that the condition of the oil is inspected approximately every two years and that the
oil is replaced at every second inspection. If dirty/low-quality oil is used, oil changes are necessary at
shorter intervals. Because the small oil volume in part-turn actuators compared to the volume in the
pipework, there is no oil change during the operating cycles. Because of this, it is recommended to
change the hydraulic oil so that the oil changes also inside the part-turn actuator and hoses not only in
the hydraulic pump.
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