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8 Servicing and Maintenance
ATTENTION
The surface of the motor must be kept free of dirt.
The motor shaft is spinning in permanently greased ball
bearings (with special grease and increased
9 Troubleshooting Guide
Fault
Motor does not start, no motor
noise
Motor does not start, humming noise
Overload trips
Power consumption is too high
Motor overheats
Pump does not pump
Insufficient flow and pressure
Incorrect flow or pressure
Running noise/Vibration
BAS6502
bearing play) and does not require any special mainte-
nance.
Cause
At least two of the power supply
leads have failed
Overload has tripped
One of the supply leads has failed
Impeller faulty
Motor bearing faulty
Pump locked up mechanically
High on/of cycling frequency
Wrong direction of rotation of im-
peller
Lime or other deposits
mechanical friction
High on/off cycling frequency
Wrong power supply (voltage or cy-
cles)
Insufficient cooling
liquid level too low
Pump mechanism faulty
Pipe blocked
Wrong direction of rotation of im-
peller
Pump mechanism silted up
Worn pump mechanism
Wrong power supply (voltage or cy-
cles)
Foreign objects in pump end
Impeller damaged
Bearing/Bushing broken
04/2020
Edition
Remedy
Check fuses, terminals and supply
leads .
Inspect overload
See above
Replace impeller
Replace bearing
Inspect pump hydraulics
Check application
See above
Clean pump mechanism
repair pump
See above
Power supply must correspond with
name plate rating
Check air flow at motor fan
Fill up liquid
replace pump mechanism
Clean pipe
Change over two power supply
leads
Clean pump mechanism
Replace pump mechanism
Power supply must correspond with
name plate rating
Remove foreign objects
Replace impeller
Replace bearing/bushing
Page 7 of 11
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