Service; Contaminated Products; Maintenance; Maintaining The Motor - Grundfos NBS Serie Notice D'installation Et De Fonctionnement

8. Service

DANGER
Moving machine parts
Death or serious personal injury
‐
Before any inspection, maintenance, service or repair
of the product, make sure the motor controls are in the
"OFF" position, locked and tagged.
DANGER
Electric shock and and unintended pump start
Death or serious personal injury
‐
Before starting work on the product, switch off the
power supply. Make sure the power supply cannot be
accidentally switched on. Use logout-tagout if
available.

8.1 Contaminated products

CAUTION
Biological hazard
Minor or moderate personal injury
‐
Flush the pump thoroughly with clean water and rinse
the pump parts in water after dismantling.
The product will be classified as contaminated if it has been used
for a liquid which is toxic or injurious to health.
If you request Grundfos to service the product, contact Grundfos
with details about the liquid before returning the product for service.
Otherwise, Grundfos can refuse to accept the product for service.
The product must be cleaned thoroughly before you return it.
Costs of returning the product are to be paid by the customer.

8.2 Maintenance

DANGER
Moving machine parts
Death or serious personal injury
‐
Before any inspection, maintenance, service or repair
of the product, make sure the motor controls are in the
"OFF" position, locked and tagged.
DANGER
Electric shock and unintended pump start
Death or serious personal injury
‐
Before starting work on the product, switch off the
power supply. Make sure the power supply cannot be
accidentally switched on. Use logout-tagout if
available.
8.2.1 Maintenance of the pump
The pump is maintenance-free.
8.2.2 Maintaining the mechanical shaft seals
Mechanical shaft seals are maintenance-free, working almost
without any leakages.
• If any considerable or increasing seepage occurs, check the
mechanical shaft seal immediately.
• If the sliding surfaces are damaged, replace the entire shaft
seal. Treat mechanical shaft seals with utmost care.
End suction pumps equipped with mechanical shaft seals are
matched to the operating conditions for which the pump was sold.
Observe the following precautions to avoid shaft seal damage and
achieve maximum shaft seal life.
Do not run the pump dry or against a closed valve. Dry
running will cause shaft seal failure.
Do not exceed the temperature or pressure limitations for
the mechanical shaft seal in use.

8.2.3 Maintaining the motor

It is important to keep the motor clean in order to ensure adequate
ventilation.
• Check the motor at regular intervals.
• If the pump is installed in a dusty environment, check and clean
it regularly.
Lubrication of motor
Always follow the motor manufacturer's lubricating instructions.
Some information is stated on the motor nameplate, and additional
information can be found in the installation and operating manual
from the motor manufacturer.

8.2.4 Changing the mechanical shaft seal

Dismounting the mechanical shaft seal
1. Remove coupling guards.
2. Remove fork tool from the motor stool.
3. Loose the coupling set screws and bolts.
4. Take the split coupling out from the motor stool window.
5. Loose bolts from the seal cover and take out the seal cover from
the motor stool window.
6. Remove the shaft seal from the shaft and seal cover.
Installing the mechanical shaft seal
1. Lubricate the shaft with glycerine.
2. Install the rotating part of the shaft seal onto shaft.
• For 175 PSI pumps (class 125):
Assemble rotational ring on the shaft.
• For 363 PSI pumps (class 300):
Assemble the rotational ring and spacer on the shaft.
Use thread locker (Loctite 2700) to the set screws in seal,
and tighten the screw.
Keep the seal surfaces clean and lubricate seal faces
with the pumped liquid.
3. Assemble the stationary shaft seal part into seal cover. Make
sure that the O-ring is in the seal cover.
4. Assemble seal cover to the cover and tighten bolts.
5. Lift the shaft and mount fork tool.
6. Install the keys to the shafts. Place the shoulders of two
half couplings on the same plane with the surface of pump
shaft . Connect two half couplings by coupling bolts. Lubricate
the bolts with anti-seize grease and cross tighten the bolts with
correct torque (M10: 85 ± 5 Nm, M12: 90 ± 9 Nm).
7. Add thread locker (Loctite 2700) to the set screws in coupling
and tighten to fixate keys in shaft..
17