Cause The anti-suck back valve is malfunctioning.
Remedy
Repair the valve. Refer to Clean the intake port dirt-trap and anti-suck back valve on
page 46.
Cause Exhaust valve is malfunctioning.
Remedy Repair the valve. Contact Service.
Cause Oil is unsuitable.
Remedy
Change the oil (degas it, if necessary). Refer to
Chang
e the oil on page 44.
Cause Vacuum lines are dirty
.
Remedy Clean the vacuum lines.
Cause Pump is too small.
Remedy Check the process data, replace the pump if necessary.
Fault Pumping speed is too low
Cause The inlet screen in the intake port is clogged.
Remedy
Clean the dirt-trap. Install a dust lter in an intake line to pr
event clogging. Refer to Clean
the intake port dirt-trap and anti-suck back valv
e on page 46.
Cause Connecting lines are too narrow or too long.
Remedy Use adequately wide and short connecting lines.
Fault After switching off the pump under vacuum, pressure in the system rises too fast
Cause System has a leak.
Remedy Check the system.
Cause Anti-suck back valve is malfunctioning.
Remedy
Repair the valve. Refer to Clean the intak
e port dirt-trap and anti-suck back valve on
page 46.
Fault Pump gets too hot
Cause Cooling air supply is obstructed.
Remedy Set pump up correctly.
Cause Ambient temperature is too high.
Remedy
Set pump up correctly. Refer to T
able: Technical data.
Cause Process gas is too hot.
Remedy Change the pr
ocess gas.
Cause Oil level is too low.
Remedy
Add oil to reach the correct oil level. Refer to Check the oil lev
el on page 43.
53
300956027_002_A0 - 03/2022 - © Leybold
Fault nding
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