English (GB)
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12. Maintenance
12.1 Pump
The pump is maintenance-free.
12.2 Mechanical shaft seals
Mechanical shaft seals are maintenance-free,
working almost without any leakages. If any
considerable and increasing seepage occurs, the
mechanical shaft seal should be checked
immediately. If the sliding surfaces are damaged, the
entire shaft seal should be replaced. Mechanical
shaft seals should be treated with the greatest care.
12.3 Motor
Check the motor at regular intervals. It is important
to keep the motor clean in order to ensure adequate
ventilation. If the pump is installed in a dusty
environment, it must he cleaned and checked
regularly.
12.4 Lubrication
Motor bearings
Motors up to and including frame size 132 have
maintenance-free, greased-for-life bearings.
Motors larger than frame size 132 should be greased
according to the indications on the motor nameplate.
Grease spills from the motor may occur.
Grease specifications: See section 12.4.1 Bearing
grease.
12.4.1 Bearing grease
Lithium-based grease according to the following
specifications must be used:
• NLGI class 2 or 3
• viscosity of basic oil: 70 to 150 cSt at +40 °C
• temperature range: -30 °C to +140 °C during
continuous operation.
13. Periods of inactivity and frost
protection
Pumps which are not being used during periods of
frost should be drained to avoid damage.
Drain the pump by removing the drain plug (E). See
fig. 24.
Do not tighten the priming plug or replace the drain
plug until the pump is to be used again.
If the pump is to be drained prior to a long period of
inactivity, inject a few drops of silicone oil on the
shaft at the bearing bracket. This will prevent the
shaft seal faces from seizing up.
14. Service
If Grundfos is requested to service such a pump,
Grundfos must be contacted with details about the
pumped liquid, etc. before the pump is returned for
service. Otherwise Grundfos can refuse to accept
the pump for service.
Possible costs of returning the pump are paid by the
customer.
14.1 Service kits
Service kits for NB, NBG, see Grundfos Product
Center in www. grundfos.com or Service Kit
Catalogue.
15. Technical data
15.1 Electrical data
See the motor nameplate.
15.2 Sound pressure level
See table on page 30.
Warning
Before starting work on the product, switch
off the power supply. Make sure that the
power supply cannot be accidentally
switched on.
Warning
Care must be taken to ensure that the
escaping liquid does not cause personal
injury or damage to the motor or other
components.
In hot-liquid installations, pay special
attention to the risk of personal injury
caused by scalding hot liquid.
In cold-liquid installations, pay special
attention to the risk of personal injury
caused by the cold liquid.
Warning
If a pump has been used for a liquid which
is injurious to health or toxic, the pump will
be classified as contaminated.
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