Ball Bearingmaintenance; Oil Check And Change; Filling With Oil - Grundfos AP40-70 Montage- Und Betriebsanleitung

7. Attach a new impeller to the shaft. Make sure the
sliding surfaces remain undamaged.
8. Hold the impeller steady with a suitable tool, then
insert a new impeller fastener and tighten it.
9. Assemble the pump housing with the seal
housing.
10. After the assembly is finished, check that the
impeller can be turned by hand.
8.4 Ball bearing maintenance
Check the shaft for noisy or heavy operation by
turning 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 an
authorised service workshop.

8.5 Oil check and change

Use original parts only.
Use Shell Ondina X420 oil or equivalent
type.
Dispose of used oil must comply with local
regulations
CAUTION
Pressurised system
Minor or moderate personal injury
‐
The oil chamber may be under
pressure. Loosen the screws carefully
and do not remove them until the
pressure has been completely relieved.
After 3000 operating hours or at least once
a year, change the oil in the oil chamber as
described below. If the shaft seal has been
changed, the oil must be changed as well.
When the pump is new or the shaft seal is replaced,
check the oil level and water content after one week
of operation. If there is more than 20 % extra liquid
(water) in the oil chamber, the shaft seal is defective.
The table below states the quantity of oil in the oil
chamber:
16
Pump type
AP40
AP50
AP50 (1.2 kW)
AP60 (0.8 kW)
AP60 (1.8 kW)
AP70
8.5.1 Draining of oil
1. Place the pump on a level surface with one oil
screw pointing downwards.
2. Place a 1 litre capacity transparent container
under the oil screw.
3. Remove the lower oil screw.
4. Remove the upper oil screw. Inspect the oil. If the
colour is greyish white, the oil may contain water.
If the oil contains water, the shaft seal is
defective and must be replaced. If the oil quantity
is less than the specified, the shaft seal is
defective. If the shaft seal is not replaced, it can
cause motor damage.
5. Clean the surfaces for gaskets and oil screws.

8.5.2 Filling with oil

1
Oil filling
Proceed as follows:
1. Place the pump horizontally, on a level surface.
2. Fill new oil into the chamber through the oil filling
position (1). The correct oil volume is prescribed
in the Table above. Use Shell Ondina X420 or
equivalent.
3. Remove the old seal (gasket) for the oil plug,
and replace it with a new seal, which can be
found in Kit Oil Plug Seals.
Quantity [l]
0.01
0.8
0.01
0.8
0.5
0.5