en
Maintenance and repair
30
WILO GVA GmbH 2019-02
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Take immediate countermeasures if there is a build-up of toxic or asphyxiating
gases.
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If the weather conditions (e.g. ice formation, strong wind) mean it is no longer pos-
sible to work safely, stop work.
‡
Mixer is decommissioned.
‡
Drive unit has cooled to ambient temperature.
‡
Drive unit has been thoroughly cleaned and disinfected (if required).
1. Carry out maintenance measures as prescribed.
⇒ If deficiencies are identified, replace the components. See “Repairs [
}
32]”.
2. Perform maintenance measures in accordance with the manufacturer instructions.
▶ Maintenance carried out. Switch the mixer back on.
9.5.1
Recommended maintenance
measures
Regular inspection of current consumption and the operating voltage in all three phases
is recommended for smooth operation. In normal operation, these values remain con-
stant. Slight fluctuations depend on the characteristics of the fluid.
Current consumption can provide an early indication of damage to or malfunctions in
the mixer, which can then be rectified. Larger voltage fluctuations strain the motor
winding and can cause breakdown. Regular inspections can therefore largely prevent
major secondary damage and reduce the risk of total breakdown. In this regard, it is re-
commended to use remote monitoring for regular inspections.
9.5.2
Visual inspection for wear of the
mixer
Inspect individual components (propeller, hub, etc.) for damage and wear. If there are
defects, observe the following:
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If the coating is damaged, restore it.
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If components have worn, contact customer service and replace the components in
question!
9.5.3
Visual inspection of accessories
Accessories must be checked for:
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Correct fixation
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Smooth function
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Signs of wear, e.g. cracks caused by frequencies
Any defects detected must be repaired immediately or the accessories must be re-
placed.
9.5.4
Visual inspection of the connec-
tion cable
Check connection cable for:
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Bubbles
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Cracks
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Scratches
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Abrasion
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Pinch points
If damage to the connection cable is identified, decommission the mixer immediately!
Have the connection cable replaced by a qualified electrician. Only recommission the
mixer once the damage has been properly remedied!
CAUTION! Damaged connection cables can cause a short-circuit and lead to total
damage of the mixer.
9.5.5
Changing gear oil with in-built
tool
NOTICE
In-built tool for easy oil changing
Consult the motor’s rating plate for information on oil type and quantity. Consult the
manufacturer’s instructions for safety instructions and detailed work instructions on
changing the oil. The following section relates exclusively to the work steps with the
in-built tools!
