Operating Materials; Maintenance Intervals; Maintenance Work - Wilo Rexa CUT Instrucciones De Instalación Y Funcionamiento

MAINTENANCE AND REPAIR
If injuries are caused by fluids or gases that
are hazardous to health, apply the first-aid
measures specified on the notice at the working
premises and notify a doctor immediately.
• Make sure that the necessary tools and materials
are available. Order and cleanliness ensure safe
and smooth work on the pump. After working on
the pump, remove any used cleaning materials
and tools from the pump. Store all materials and
tools in their proper place.
• Operating materials should be collected in suit-
able containers and disposed of properly. Always
wear appropriate protective clothing when per-
forming maintenance and repair work. This must
also be disposed of properly.

8.1. Operating materials

8.1.1. Overview of white oil
The sealing chamber is filled with white oil that is
potentially biodegradable.
When changing the oil, we recommend the fol-
lowing oil types:
• Aral Autin PL*
• Shell ONDINA 919
• Esso MARCOL 52* or 82*
• BP WHITEMORE WOM 14*
• Texaco Pharmaceutical 30* or 40*
All oil types marked with "*" are approved for use
with foods in accordance with "USDA-H1".
Filling quantities
• Motor version "S": 900 ml
• Motor version "P": 900 ml
8.1.2. Overview of grease
The following lubricating grease can be used in
accordance with DIN 51818/NLGl Class 3:
• Esso Unirex N3

8.2. Maintenance intervals

To ensure reliable operation, various maintenance
tasks must be carried out regularly.
The maintenance intervals must be specified
according to the load on the pump. Regardless of
the specified maintenance intervals, the pump or
installation must be checked if strong vibrations
occur during operation.
When used in sewage lifting units inside
buildings or on areas of land, the maintenance
intervals and work shown in DIN EN 12056‐4
must be adhered to.
8.2.1. Intervals for normal operating conditions
2 years
• Visual inspection of the power supply cable
• Visual inspection of accessories
• Visual inspection of the coating and housing for
wear
• Functional inspection of all safety and monitoring
devices
• Inspection of the switchgear/relays used
Installation and operating instructions Wilo-Rexa CUT
• Oil change
NOTE
If a pencil electrode is installed to monitor the
sealing chamber, the oil is changed based on
the indicator.
15000 operating hours or after 10 years at the
latest (motor version "P" only)
• General overhaul
8.2.2. Intervals for harsh operating conditions
Under harsh operating conditions, the specified
maintenance intervals must be shortened accord-
ingly. In this case, contact Wilo customer service.
If using the pump under harsh conditions, we also
recommend signing a maintenance contract.
Harsh operating conditions include:
• A large proportion of fibrous material or sand in
the fluid
• Turbulent inlet (e.g. due to air entry, cavitation)
• Strongly corrosive fluids
• Strongly gassing fluids
• Unfavourable duty points
• Operating states subject to water hammers
8.2.3. Recommended maintenance measures to en-
sure smooth operation
We recommend regular inspections of the current
consumption and the operating voltage in all 3
phases. In normal operation, these values remain
constant. Slight fluctuations depend on the char-
acteristics of the fluid. The current consumption
can provide an early indication of damage and/
or malfunctions in the impeller, bearings and/or
motor, which can be rectified. Larger voltage fluc-
tuations strain the motor winding and can cause
the pump to break down. Regular inspections
can therefore largely prevent major secondary
damage and reduce the risk of total breakdown.
We recommend the use of remote monitoring for
regular inspections. Please contact Wilo customer
service.

8.3. Maintenance work

Before carrying out maintenance work:
• Disconnect the pump from the power and secure
it against being switched on inadvertently.
• Allow the pump to cool down and clean it thor-
oughly.
• Make sure that all the operationally-relevant
parts are in good condition.
8.3.1. Visual inspection of the power supply cable
The power supply cables must be checked for
blisters, cracks, scratches, abrasion and/or crush-
ing. If any damage is detected, the pump must be
decommissioned immediately and the damaged
power supply cable must be replaced.
The cables may only be replaced by Wilo
customer service or an authorised or certified
service workshop. The pump may only be start-
ed up again once the damage has been properly
remedied.
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