10. Faults
page 27
EN
Working on products that have not
been disconnected from the power
supply can cause injury to persons.
Assembly, maintenance, and repair
work may only be carried out by
qualified experts on a product that is
not connected to a power supply.
The supply voltage must be turned
off before any product components
are opened.
Hot surfaces of an electrical motor
can cause burn of skin. The surfaces
of a motor should only be touched
with protection gloves or when
motor is cold after a period of
standstill.
Centralized lubrication systems are
under pressure when they are being
operated. Centralized lubrication
systems must therefore be
depressurized before starting
assembly, maintenance, or repair
work and before making any
changes to the system.
Table 3 (contin.)
Error analysis and remedy
Problem
Possible cause
Remedy
Air bubble inside pump
Vent pump.
Wrong sense of rotation
Correct sense of rotation according to the electric diagram.
Pump runs, but does not supply
medium
Shut-off valve closed
Open shut-off valve.
Pump draws in air
Check the filling level of the pump and correct it if necessary.
Intake height too low
Increase medium level to intake height.
Shaft bearing defective
Replace shaft bearing.
Shaft seal defective
Replace shaft seal.
End play of pump misadjusted
Adjust end play.
Noise, vibration or leaks
Pump not installed firmly
Fasten connecting flange.
Pump blocked
Check the intake opening and clean it, if necessary.
Impeller chafes
Ensure that impeller is savely fastened and pump shaft is not bent or off center.
Pump shaft moves hard
Shaft bearing defective
Replace shaft bearing.