▪ Check the rolling element bearings for running noises.
Vibrations, noise and an increase in current input occurring during unchanged
operating conditions indicate wear.
▪ Monitor the correct functioning of any auxiliary connections.
▪ Cooling system
Take the pump out of service at least once a year to thoroughly clean the cooling
system.
▪ Monitor the stand-by pump.
To make sure that stand-by pumps are ready for operation, start them up once a
week.
▪ Monitor the bearing temperature.
The bearing temperature must not exceed 90 °C (measured on the outside of the
bearing bracket).
CAUTION
Operation outside the permissible bearing temperature
Damage to the pump!
▷ The bearing temperature of the pump (set) must never exceed 90 °C (measured
on the outside of the bearing bracket).
NOTE
After commissioning, increased temperatures may occur at grease-lubricated rolling
element bearings due to the running-in process. The final bearing temperature is
only reached after a certain period of operation (up to 48 hours depending on the
conditions).
7.2.2 Inspection work
DANGER
Excessive temperatures caused by friction, impact or frictional sparks
Explosion hazard!
Fire hazard!
Damage to the pump set!
▷ Regularly check the coupling guard, plastic components and other guards of
rotating parts for deformation and sufficient distance from rotating parts.
7.2.2.1 Checking the coupling
Check the flexible elements of the coupling. Replace the relevant parts in due time if
there is any sign of wear and check the alignment.
7.2.2.2 Checking the clearances
The back pull-out unit must be removed to check the clearances.
If the clearance is larger than permitted (see the following table), fit a new casing
wear ring 502.01 and/or 502.02.
The clearances given refer to the diameter.
Table 17: Clearances between impeller and casing (cover)/between impeller and
casing wear ring
Impeller
material
Clearances
New Maximum
G, B 0,3 mm 0,9 mm
C, D, E 0,5 mm 1,5 mm
7 Servicing/Maintenance
MegaCPK
45 of 74
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