Leybold Vacuum Pump RUVAC WA 251 US

5.6 Cleaning the Pumping Chamber

Ensure all safety precautions from Section 5.1 are observed

Remove the two connecting lines

Choose the method to remove contaminants

Check if impellers move freely and without resistance by turning them by hand

Ensure no loosened deposits remain in the pump

Note if disassembly is required and contact after-sales service if necessary

Pressure Balance Line Valve Cleaning — RUVAC WAU Only

Check oil level in the oiler (10/1)

Diagnosis — inner shaft seal fault

Is the oil level in the oiler dropping without oil appearing under the shaft seal housing?

Switch off the pump immediately if inner shaft seal is faulty

Diagnosis — outer shaft seal fault

Is the oil level in the oiler dropping with oil appearing under the shaft seal housing?

Collect oil dripping under the motor to prevent slipping

5.3 Oil change/shaft seal housing

Observe all safety information provided in Section 5.1

Unscrew the oil-drain screw (10/3) under the shaft seal housing

Screw in the oil-drain screw using a gasket in perfect condition

Fill in fresh oil at the oiler (10/1)

Is the oil level for the shaft seal housing visible in the oiler?

Select the current state of the pump

Observe all safety information provided in Section 5.1

Remove the dirt trap from the intake flange

Rinse the dirt trap using a suitable solvent

Thoroughly dry the dirt trap with compressed air

Check if the dirt trap is damaged

Replace the dirt trap if it is damaged

Check the oil level and condition in the oil level glass and oiler

Is the oil light-brown in color?

Correct the oil level as required

Enter the oil level in the oil-level glass (8/2)

Is the oil level correct for the selected flow orientation?

Adjust the oil level if necessary