Grundfos SL1 Serie Instrucciones De Instalación Y Funcionamiento página 19

• Ball bearings
Check the shaft for noisy or heavy operation (turn the shaft by
hand). Replace defective ball bearings.
A general overhaul of the pump is usually required in case of
defective ball bearings or poor motor function. This work must
be carried out by Grundfos or a service workshop authorized
by Grundfos.
Warning
Defective bearings may reduce the Ex safety.
• O-rings and similar parts
During service/replacement, make sure that the grooves for
the O-rings as well as the seal faces have been cleaned
before the new parts are fitted. Grease O-rings and recesses
before assembly.
Note Do not reuse rubber parts.
Warning
Explosion-proof pumps must be checked by an
authorized Ex workshop once a year.
10.2 Dismantling the pump
See www.grundfos.com for service videos.
Note
10.2.1 Oil change
After 3000 operating hours or once a year, change the oil in the
oil chamber as described below.
If the shaft seal has been replaced, the oil must be changed.
Warning
When loosening the screws of the oil chamber, note
that pressure may have built up in the chamber. Do
not remove the screws until the pressure has been
fully relieved.
Draining of oil
1. Place the pump on a plane surface with one oil screw pointing
downwards.
2. Place a suitable container (approx. 1 litre), for instance made
of transparent plastic material, under the oil screw.
Used oil must be disposed of in accordance with
Note
local regulations.
3. Remove the lower oil screw.
4. Remove the upper oil screw.
If the pump has been in operation for a long period of time, if
the oil is drained off shortly after the pump has been stopped,
and if the oil is greyish white like milk, it contains water. If the
oil contains more than 20 % water, it is an indication that the
shaft seal is defective and must be replaced. If the shaft seal
is not replaced, the motor will be damaged.
If the quantity of oil is smaller than the quantity stated in
section 10.4 Oil quantities, the shaft seal is defective.
5. Clean the faces for the gaskets for oil screws.
Filling with oil
1. Turn the pump so that the oil filling holes are placed opposite
to each other, pointing upwards.
Oil filling/venting
Fig. 16 Oil filling holes
2. Pour oil into the chamber.
For oil quantity, see section
3. Fit the oil screws with new gaskets.
10.2.2 Removing the pump housing and impeller
For position numbers, see pages
Procedure
1. Loosen the clamp (pos. 92).
2. Remove the screw (pos. 92a) using your fingers.
3. Remove the pump housing (pos. 50) by inserting two
screwdrivers between the cooling jacket and the pump
housing.
4. Remove the screw (pos. 188a). Hold the impeller with a strap
wrench.
Fig. 17 Removing the impeller
5. Loosen the impeller (pos. 49) with a light blow on the edge.
Pull it off.
6. Remove the key (pos. 9a) and the spring for impeller
(pos. 157).
10.4 Oil quantities.
648 and 649.
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