Grundfos NK Serie Montage- Und Betriebsanleitung Seite 27

Relubrication via grease nipples
Grundfos recommends the following relubricating intervals and
grease quantities:
Relubricating
Diameter of
interval
shaft
[operating
[mm]
hours]
24 7500
32 4500
42 4500
48 3500
60 3500
The relubricating interval is an estimated value, valid
for an operating temperature up to 70 °C. We
Caution
recommend to halve the intervals for every 15 °C
increase in operating temperature above 70 °C.
How to renew grease
Follow this procedure to renew grease:
1. Place a suitable container under the bearing bracket to collect
used grease.
2. Remove the grease drain plugs. See fig. 33.
3. Fill the bearing bracket with the recommended quantity of
grease by means of a grease gun.
4. Refit the drain plugs.
Main drain plug
Grease drain plugs
Fig. 33 Renewing the grease
Grease quantity [g]
Angular
Roller
contact
bearing
bearing
11 15
13 20
22 30
27 38
30 41
Grundfos recommends SKF LGHP2 grease for relubrication. See
the table below.
Basic characteristics
Code, DIN 51825 K2N-40
Consistency class, NLGI 2-3
Thickener Polyurea (di-urea)
Base oil Mineral
Operating temperature -40 - +150 °C, -40 - +302 °F
Dropping point, ISO 2176 240 °C, 464 °F
Density, DIN 5175 At 20 °C, 68 °F: 0.85 - 0.95 g/cm
Base oil viscosity
40 °C, 104 °F 96 mm
100 °C, 212 °F 10.5 mm
If there is visible grease leakage, we advise you to
Note open the bearing bracket cover and replace the V
ring. See section 13.1 Service
If the pump has been stored or out of operation for
Caution
more than six months, we recommend you to replace
the grease before it is put into operation.
In case of ingress of contamination, more frequent
relubrication than indicated by the relubricating
interval will reduce the negative effects of foreign
particles. This will reduce the damaging effects
Caution
caused by overrolling the particles. Liquid
contaminants, such as water or process liquids, also
call for shorter relubricating intervals. In case of
severe contamination, consider continuous
relubrication.
Never mix greases with different thickeners, such as
a lithium-based grease with a sodium-based grease,
before checking with the suppliers.
Never mix a mineral oil with a synthetic oil.
Caution
Some lubricants are compatible, but assessing the
compatibility of two lubricants can be difficult. As a
general rule, always relubricate a bearing with the
same lubricant as was used originally.
3
2
/s
2
/s
kits.
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