Cause Oil is unsuitable.
Remedy
Change the oil. Refer to Check the oil condition on page 43.
Cause Oil cycle is obstructed.
Remedy Clean or repair the oil lines and channels.
Fault Oil in the intake line or the vacuum vessel
Cause Oil comes from the vacuum system.
Remedy Check the vacuum system.
Cause Anti-suck back valve is obstruction.
Remedy
Clean or repair the valve. Refer to Clean the intak
e port dirt-trap and anti-suck back
valve on page 46.
Cause Sealing surfaces of anti-suck back valve is damaged or dirty.
Remedy
Clean or repair the inlet port and the anti-suck back valve. Refer to Clean the intake
port dirt-trap and anti-suck back valve on page 46.
Cause Oil level is too high.
Remedy
Drain the excess oil. Refer to
Check the oil level on page 43.
Fault Oil is turbid
Cause Condensation
Remedy
-Degas the oil or change the oil and clean the pump. Refer to Change the oil on page
44.
-To prevent condensation open the gas ballast valve or insert a condensate trap.
Fault Pump is excessively noisy
Cause Oil level is very low (Oil is no longer visible).
Remedy
Add oil. Refer to Check the oil lev
el on page 43.
Cause Silencing nozzle is clogged.
Remedy Clean or replace the silencing nozzle.
Cause Intake pressur
e is too high.
Remedy Lower the intake pressure.
Cause Coupling element is worn.
Remedy
Install new coupling element. Refer to Check the coupling and coupling element on
page 47.
Cause Vanes, bearings or other pump parts are damaged.
Remedy Repair the pump. Contact Service.
300956027_002_A0 - 03/2022 - © Leybold
54
Fault nding
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