Troubleshooting
35GA01601_002_C1 - 03/2018 - © Leybold
6 Troubleshooting
Fault Possible cause Remedy Repair*
Pump does not start. Wiring is malfunctioning. Check and repair wiring
-
Power supply voltage does not
match the rating of the motor.
Replace the motor.
5.6
Motor is malfunctioning. Replace the motor. 5.6
Oil temperature is below 10 °C. Heat the pump and pump oil or use
a different oil.
4.3.3/5.4
Oil is too thick. Change the oil. 5.4
Exhaust filter/exhaust line is
clogged.
Replace the filter or clean the exhaust
line.
-
Pump is seized up
(sign: pump is jammed).
Repair the pump.
Service
Pump does not reach ultimate
pressure.
Measuring technique or gauge is
unsuitable.
Use correct measuring technique and
gauge. Measure the pressure directly
at the pump’s intake port.
-
External leak
1)
. Repair the pump. Service
Dirty internal demister Perform maintenance M. Kit 1 / 2.3.5
Exhaust valve is malfunctioning. Repair the valve. M. Kit 2
Oil is unsuitable. Change the oil (degas it, if necessary). 5.4
Intake line dirty or leaky. Clean or exchange the intake line. -
Pump is too small. Check the process data, replace the
pump, if necessary.
-
Pumping speed is too low. Clogged exhaust filter. Exchange the filter element. -
Connecting lines are too narrow or
too long.
Use adequately wide and short
connecting lines.
3.3
After switching off the pump
under vacuum, pressure in the
system rises too fast.
System has a leak.
Faulty tandem valve.
Inner shaft seal is faulty.
Faulty exhaust or bypass valve.
Check the system.
Repair the valve.
exchange theshaft seal.
Repair the valve(s).
-
Compl. Set
KCompl. Set
M. Kit 2
* Repair: Refer to the stated section in these Operating Instructions.
1)
Bubble test: The warm pump with degassed oil is running without gas ballast and the intake is blanked off. The exhaust line is
led into a vessel with water.
If an evenly spaced line of bubbles appears then the pump has an external leak.
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