KSB MK, Installation & Operating Manual

Page: 35 / 64

7 Servicing/Maintenance
35 of 64
MK
▪ 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.
▪ Monitor the stand-by pump.
To make sure that stand-by pumps are ready for operation, start them up once a
week.
▪
Make sure that the floats of rod-actuated and magnetic float switch
arrangements can always slide along the guide rods without obstruction.
▪ The minimum fluid level must be observed. ( ð Section 6.2.3.2, Page 30)
▪
Monitor the bearing temperature.
The bearing temperature must not exceed 90 °C (measured on the outside of the
bearing bracket).
For monitoring the bearing temperature, a G
1
/
8
connection hole (Ø 7 mm) is
provided in thrust and radial bearing 303.1 (max. width across corners of fastener
used: 18 mm).
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 Lubrication and lubricant change
DANGER
Excessive temperatures as a result of bearings running hot or defective bearing
seals
Explosion hazard!
Fire hazard!
Damage to the pump set!
▷
Regularly check the condition of the lubricant.
7.2.2.1 Lubrication of radial ball bearings
The shaft runs in a radial ball bearing in the thrust and radial bearing. The radial ball
bearing is fitted with sealing washers on both sides and greased for life.