Leybold Vacuum Pump RUVAC WAU 501 EU

Ensure all safety precautions are observed

Use the oil-drain facility for safety and simplicity

Unscrew the oil-drain screws (11/2) or (11/1) and the oil-fill screw (11/4) to drain the oil

Clean the sealing surface and reinstall the oil-drain screw using a gasket in perfect condition

Wipe off any oil residues from the casing

Ensure the use of the correct oil type

Consult if using other oils or special lubricants

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

Check the condition of the shaft seals and bushing

Is the oil level in the oiler dropping?

Is there oil under the shaft seal housing?

Diagnosis — inner shaft seal fault

Is the inner shaft seal faulty?

Switch off the pump immediately if the inner shaft seal is faulty

Repair the pump if the inner shaft seal is faulty

Diagnosis — outer shaft seal fault

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

Correct oil level and condition as required

If the oil is dark, it may indicate early ageing due to high temperatures

Check oil level at vertical flow (center of oil-level glass when pump is not running)

Check oil level at horizontal flow (6 mm above center of oil-level glass)

Ensure oil level is not too low or too high to avoid inadequate lubrication or oil entering the pumping chamber

5.7 Cleaning the Valve of the Pressure Balance Line

Observe all safety information provided in Section 5.1

Remove the screws and take off the cover (12/1) with O-ring (12/2)

Remove the valve disk (12/6) with O-rings (12/5) and (12/7)

Check if the bushing (12/3) is damaged

Pull out and replace the bushing (12/3) if damaged

Clean all parts or replace them if necessary

Reassemble in the reverse sequence