Labconco VACUUBRAND Diaphragm Pump 7393000: Troubleshooting
Troubleshooting: Labconco VACUUBRAND Diaphragm Pump 7393000
page 50 of 74
Troubleshooting
Fault Possible cause Remedy
❑
Pump does not
➨
Electrical power cord
✔
Plug in power cord.
start or stops im-
not plugged in, electri-
Check fuse.
mediately.
cal supply failure?
➨
Device fuse blown?
✔
Identify cause of failure.
Replace device fuse.
➨
Overpressure in outlet
✔
Remove blockage in line,
line?
open valve.
➨
Motor overloaded?
✔
Allow motor to cool down,
identify and eliminate
cause of failure. Manual
reset is necessary. Switch
off pump or unplug.
❑
Pump does not
➨
Centring ring at small
✔
Check pump directly -
achieve its ultimate
ange connection not
connect vacuum gauge
vacuum or usual
correctly positioned, or
directly at pump inlet -
pumping speed.
leak in the pipeline or
then check connection,
vacuum system?
pipeline and vacuum
system if necessary.
➨
Long, narrow vacuum
✔
Use lines with larger di-
line?
ameter, length as short as
possible.
➨
Pump has been ex-
✔
Allow pump to run for
posed to condensate?
some minutes with atmo-
spheric pressure at the
inlet to purge.
➨
Deposits have been
✔
Clean and inspect the
formed inside the
pump heads.
pump?
➨
Diaphragms or valves
✔
Replace diaphragms and/
damaged?
or valves.
➨
Outgassing substances
✔
Check process parame-
or vapor generated in
ters.
the process?
page 51 of 74
Fault Possible cause Remedy
❑
Pump too noisy.
➨
Atmospheric or high
✔
Connect hose or silencer
pressure at the pump
to pump outlet. Be careful
inlet?
not to cause outlet over-
pressure, especially with
condensable vapors.
➨
Diaphragm crack or
✔
Perform maintenance.
diaphragm clamping
disc loose?
➨
Other than above men-
✔
Contact local distributor.
tioned causes?
❑
Pump seized.
✔
Contact local distributor.
➨ A service manual with exploded view drawings, spare parts list and
directions for repair is available on request.
+ The service manual is intended for trained service people only.
