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10.2 Dismantling the pump
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.
Draining of oil
1. Place the pump on a plane surface with one oil
screw pointing downwards.
2. Place a suitable container (approximately 1 litre),
for instance made of transparent plastic material,
under the oil screw.
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.
Fig. 16 Oil filling holes
2. Pour oil into the chamber.
For oil quantity, see section 10.4 Oil quantities.
3. Fit the oil screws with new gaskets.
10.2.2 Removing the pump housing and impeller
For position numbers, see pages 884 and 885.
Procedure
1. Loosen the clamp (92).
2. Remove the screw (92a) using your fingers.
3. Remove the pump housing (50) by inserting two
screwdrivers between the cooling jacket and the
pump housing.
4. Remove the screw (188a). Hold the impeller with
a strap wrench.
Fig. 17 Removing the impeller
5. Loosen the impeller (49) with a light blow on the
edge. Pull it off.
6. Remove the key (9a) and the spring for impeller
(157).
See www.grundfos.com for service videos.
CAUTION
Pressurised system
Minor or moderate personal injury
- 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.
Used oil must be disposed of in
accordance with local regulations.
TM04 6477 0410TM04 6476 0410
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