en Maintenance and repair
24 WILO SE 2017-03
9.4.3 Maintenance intervals for harsh conditions
Under harsh operating conditions, specified mainten-
ance intervals must be shortened if required. Harsh op-
erating conditions include:
▪Fluids with long-fibre components
▪Turbulent inlet (e.g. due to air intake, cavitation)
▪Strongly corroding or abrasive fluids
▪Heavily gas generating fluids
▪Operation at an unfavourable duty point
▪Pressure surges
When using pumps under hard conditions, it is recom-
mended to sign a maintenance contract. Contact cus-
tomer service.
9.5 Maintenance measures
WARNING
Sharp edges on the impeller and suction port
Sharp edges can form on the impeller and suction
port. There is danger of limbs being cut-off! Pro-
tective gloves must be worn to protect from cuts.
WARNING
Hand, foot or eye injuries due to lack of pro-
tective equipment!
Danger of (serious) injuries during work. Wear the
following protective equipment:
• Safety gloves against cuts
• Safety shoes
• Closed safety goggles
The following pre-requisites must be fulfilled prior to
starting maintenance measures:
▪Pump cooled down to the ambient temperature.
▪Pump cleaned thoroughly and disinfected (if required).
9.5.1 Recommended maintenance measures
Regular inspection of power consumption and the op-
erating voltage in all three phases is recommended for
smooth operation. In normal operation, these values
remain constant. Slight fluctuations depend on the
characteristics of the fluid. Power consumption can
provide an early indication of damage or malfunctions
in the impeller, bearings or motor, which can be recti-
fied. Larger voltage fluctuations strain the motor wind-
ing and can cause the pump to break down. Regular in-
spections can therefore largely prevent major second-
ary damage and reduce the risk of total breakdown. In
this regard, it is recommended to use remote monitor-
ing for regular inspections.
9.5.2 Visual inspection of the power supply cable
The power supply cables must be checked for:
▪Bubbles
▪Cracks
▪Scratches
▪Abrasion
▪Crushing
If the power supply cables are damaged, the pump
must be decommissioned immediately! Customer ser-
vice must replace the damaged power supply cable.
The pump may only be started up again once the dam-
age has been properly remedied.
CAUTION!Water may penetrate into the pump due to
the damaged power supply cables! Water ingress
leads to total damage of the pump.
9.5.3 Visual inspection of accessories
Accessories must be checked for:
▪Correct fixation
▪Smooth function
▪Wear symptoms
Detected defects must be repaired immediately or the
accessories must be replaced.
9.5.4 Visual inspection of the housing for wear
The housing parts are not allowed to have any apparent
damage. Contact customer service if defects are detec-
ted!
9.5.5 Function test of the monitoring equipment
To test resistances, the pump must be cooled down to
the ambient temperature!
9.5.5.1 Test the resistor of the temperature sensor
Measure the resistor of the temperature sensors with
an ohmmeter. The bimetallic strips must have a meas-
ured value of 0Ohm (passage).
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