Leybold Vacuum Pump RUVAC WAU 251 EU

Ensure all safety precautions from Section 5.1 are followed

Remove the dirt trap from the intake flange

Rinse the dirt trap using a suitable solvent

Thoroughly dry the dirt trap with compressed air

Replace the dirt trap if it is damaged

Switch off the pump and vent to atmospheric pressure before removing oil-drain or oil-fill plug.

Ensure the pump has cooled down to avoid burns from casing and oil exceeding 80 °C.

Wear protective gloves to protect against aggressive residues in the oil.

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 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 perfect condition gasket

Wipe off any oil residues from the casing

Consult Sections 1.3 and 1.4 for oil quantities and ordering data

Ensure correct oil type is used

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

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