Grundfos NK Montage- Und Betriebsanleitung Seite 27

Figure 19 shows an example of a metal bellows expansion joint
with limiting rods.
Fig. 19 Metal bellows expansion joint with limiting rods
Due to the risk of rupture of the rubber bellows, metal bellows
expansion joints may be preferred at temperatures above
+100 °C combined with high pressure.
6.7 Bearing bracket
6.7.1 Bearing bracket with automatic grease lubricators
Fig. 20 Bearing bracket with automatic grease lubricators
The lubricators are supplied separately. Fit them on the bearing
bracket, and set them to empty within 12 months according to the
instructions supplied with the lubricators.
Grease nipples must not be used instead of
automatic grease lubricators. Constant renewal
Caution
of grease is essential for the lubricating function
and the bearing life.
6.7.2 Bearing bracket with constant-level oiler
Fig. 21 Bearing bracket with constant-level oiler
On delivery, there is no oil in bearing bracket.
Caution
It has to be filled with the oil supplied.
Fit the constant-level oiler on the bearing bracket
Note
before filling oil into the bearing bracket.
See instructions on the label on the reservoir.
Filling of oil
Step Action
1 Remove the filling plug.
Hinge down the constant-level oiler, and pour the oil
2 supplied through the filling hole until the oil reaches
level (1) in the connection elbow. See fig. 22.
Fill the reservoir of the constant-level oiler with oil, and
snap it back into operating position.
Now oil will be filled into the bearing bracket.
3
Air bubbles can be seen in the reservoir during this
process. Continue until the correct oil level is reached
(2). See fig. 22.
When no bubbles appear in the reservoir, refill the
4
reservoir, and snap it back into operating position.
5 Fit the filling plug.
Filling plug
Full constant-
level oiler
Oil level in
constant-level oiler
when filled with oil
(topped up)
Drain plug
Fig. 22 Filling of oil
The oil level in the bearing bracket should always
be as shown in fig. 22.
Caution
Check the oil level regularly during operation,
and add oil, if necessary. The oil level must
always be visible in the sight glass.
Checking of oil level
The oil level in the bearing bracket will be correct as long as the
function of the constant-level oiler is correct. To check the
function of the constant-level oiler, slowly drain oil through the
drain plug until the constant-level oiler starts to operate, i.e. until
air bubbles can be seen in the reservoir.
Correct oil level
in bearing
bracket with
constant-level
oiler during
operation (2)
Oil level (1)
when filling
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