31
7
TROUBLESHOOTING
Only manufacturing firm and authorized service workshops may work on the pump and
their accessories during the warranty period.
Trouble
Cause
Remedy by
Remedy with
Vacuum pump
does not start
No power supply
Qualified
electrician
Check electrical installation
Motor defective
Service
workshop
Exchange
Coupling defective
Repair and/or exchange
Starting temperature too low
User
Put vacuum pump in a warm
place corresponding to the
starting temperature
Oil is resinous after too long storage
User or
Service
workshop
General maintenance /
cleaning
Vacuum pump
does not
generate
a vacuum
Ultimate pressure few mbar or atmospheric
pressure, oil shortage
User
Top-up oil
Oil is dirty
Operate with gas ballast,
or perform oil change with
flushing
Oil supply to pump unit interrupted or reduced
Check that the oil circulation
is functioning, measure the
oil pressure at operating
temperature, 1 – 1.2 bar
overpressure, check that
the pipes are clear and
have no leaks
Gas ballast valve open
Close the gas ballast valve
Shaft seals defective
User or
Service
workshop
Exchange
Work or pressure control valve defective
Intake valve defective
Repair
Oil supply to pump aggregate reduced,
Oil superimposition interrupted by work valve
Built-up pressure in the oil casing too high
because of exhaust gas pipe or oil mist filter
Check exhaust pipe,
change filter insert
Vacuum pump
runs very loudly
Motor, rotary vanes and/or shaft seal rings
defective, rotary vane spring broken
User or
Service
workshop
Repair and/or exchange