Labconco VACUUBRAND Diaphragm Pump 7393001: Troubleshooting
Troubleshooting: Labconco VACUUBRAND Diaphragm Pump 7393001
page 50 of 74
Fault
Possible cause
Remedy
❑
Pump does not
start or stops im-
mediately.
➨
Electrical power cord
not plugged in, electri-
cal supply failure?
✔
Plug in power cord.
Check fuse.
➨
Device fuse blown?
✔
Identify cause of failure.
Replace device fuse.
➨
Overpressure in outlet
line?
✔
Remove blockage in 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
achieve its ultimate
vacuum or usual
pumping speed.
➨
Centring ring at small
flange connection not
correctly positioned, or
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.
➨
Pump has been ex-
posed to condensate?
✔
Allow pump to run for
some minutes with atmo-
spheric pressure at the
inlet to purge.
➨
Deposits have been
formed inside the
pump?
✔
Clean and inspect the
pump heads.
➨
Diaphragms or valves
damaged?
✔
Replace diaphragms and/
or valves.
➨
Outgassing substances
or vapor generated in
the process?
✔
Check process parame-
ters.
Troubleshooting
page 51 of 74
Fault
Possible cause
Remedy
❑
Pump too noisy.
➨
Atmospheric or high
pressure at the pump
inlet?
✔
Connect hose or silencer
to pump outlet. Be careful
not to cause outlet over-
pressure, especially with
condensable vapors.
➨
Diaphragm crack or
diaphragm clamping
disc loose?
✔
Perform maintenance.
➨
Other than above men-
tioned causes?
✔
Contact local distributor.
❑
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.
