Cause:

• Deterioration in the packing.
• Scaling on the packing.
• Using a highly permeable cutting oil.
• An environment that exceeds the IP functionality.

Measures:

• In a mist environment, pull off and replace the packing every time the cover is removed.
• If a highly permeable cutting fluid is being used, or in an environment that exceeds the IP functionality, purge the air and take measures on the jacket.

* Cutting oil that has got inside the arm must be thoroughly cleaned away or the components inside the arm are at risk of rotting.