Labconco VACUUBRAND HYBRID Rotary Vane Pump 7584000 User Manual
Page 39
Fault
Possible cause
Remedy
❑ Pump does not
achieve its ultimate
vacuum or usual
pumping speed.
➨ Leak in the pipeline or
vacuum system?
✔ Check pump directly -
connect vacuum gauge
directly at pump inlet -
then check connection,
pipeline and vacuum
system if necessary.
➨ Long, narrow vacuum
line?
✔ Use lines with larger di-
ameter, length as short as
possible.
➨ Not enough oil?
✔ Top up oil to correct level.
➨ Wrong type of oil?
✔ Change oil and flush with
oil (see ”Oil change”).
➨ Oil contaminated (also
with solvents)?
✔ Change oil and flush with
oil (see ”Oil change”).
➨ Outgassing substances
or vapor generated in
the process?
✔ Check process parame-
ters.
➨ Pump has not yet
reached its operating
temperature?
✔ Allow the pump to reach
its operating temperature.
➨ None of the above
mentioned causes?
✔ Contact local distributor.
❑ Pump too noisy or
strange noise.
➨ Too much oil?
✔ Lower oil level to mark
”max.”.
➨ Motor thermally over-
loaded?
✔ Allow motor to cool down
(< 50°C (122°F)), identify
and eliminate cause of
failure. Provide sufficient
ventilation.
➨ Diaphragm damaged? ✔ Replace diaphragm.
➨ Pump seized?
✔ See below.
➨ Overpressure in outlet
line?
✔ Remove blockage in line,
open valve.
➨ None of the above
mentioned causes?
✔ Contact local distributor.
❑ Oil in the inlet line. ➨ Back diffusion (small
amount of oil, oil film)?
✔ Install a sorption trap or a
separator, if necessary.
➨ Back streaming (large
amount of oil)?
✔ Contact local distributor.