English (GB)
8
8.3 Annual maintenance
Pumps running normal operation must be inspected every 3000
operating hours or at least once a year. If the pumped liquid is
very muddy or sandy, inspect the pump at shorter intervals.
Pumps with sensor offer the possibility of constant monitoring of
key components in the pump, such as shaft seal condition,
bearing temperature, winding temperature, insulation resistance
and moisture in the motor.
Check the following points:
• Power consumption
See the pump nameplate.
• Oil level and oil condition
See section 8.4 Checking and changing the oil.
• Cable entry
Make sure that the cable entry is watertight (visual inspection)
and that the cable is not sharply bent and/or pinched.
See section 9.1 Checking and replacing the cable.
• Pump parts
Check the impeller, the pump housing, etc. for possible wear.
Replace defective parts.
See section 8.5 Cleaning and inspecting the pump.
• Ball bearings
Check the shaft for noisy or heavy operation (turn the shaft by
hand). Replace defective 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 authorised
by Grundfos.
• O-rings and similar parts
During service or 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.
• Sensors
See sections 12. Drawings and 7. Service tools.
8.4 Checking and changing the oil
Change the oil in the oil chamber in these cases as described:
• After 3000 operating hours or once a year.
• If the shaft seal has been replaced.
Draining the oil
Proceed as follows:
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. Loosen and 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, the
shaft seal is defective.
5. Clean the faces for the gaskets for oil screws.
Explosion-proof pumps must be checked by an
authorised Ex workshop after 3000 working hours or
at least once a year.
If the pump has not been in operation for some time,
vent it to let out any explosive gasses gathered in the
pump.
The cable must be replaced by Grundfos or a service
workshop authorised by Grundfos.
Defective bearings may reduce the Ex safety.
Do not reuse used rubber parts.
Use Shell Ondina X420 oil or similar type.
Power [kW] Oil quantity [l]
2-pole
2.2
0.30
3.0
4.0
0.556.0
7.5
9.2
0.70
11.0
4-pole
1.0
0.30
1.3
1.5
2.2
3.0
0.554.0
5.5
7.5 0.70
CAUTION
Pressurised system
Minor or moderate personal injury
- As pressure may have built up in the oil chamber,
loosen the screws slowly, and do not remove the
screws until the pressure has been fully relieved.
Dispose of used oil in accordance with local
regulations.
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