1. Put the vacuum machine on a level surface allowing an easy access to the rear.
2. Remove the back panel by loosing the relative screws.
3. Unscrew the oil drain plug.
4. Drain the oil completely in a container.
5. Close the oil drain plug tightening it completely. (In order to make a better cleaning of the inner part of the pump unscrew the loading plug and blow compressed air in the pump)
WARNING: Never use the drained oil again.
6. Unscrew the loading plug of the pump and fill with new oil (for the correct quantity please check the instruction manual).
7. Close the loading plug tightening it completely.
PERIODICALLY CHECK THE OIL WINDOW OF THE PUMP: A LEVEL HIGHER THAN THE MAXIMUM CAN OBSTRUCT THE FILTER, WHILE A LE VEL LOWER THAN THE MINIMUM CAN CAUSE A LOW VACUUM DEGREE AND DAMAGE THE PUMP.
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