KSB CTN - Lubrication and Lubricant Change of Thrust Bearings (Rolling Element Bearings)

7 Servicing/Maintenance
41 of 76
CTN / CTN-H
DANGER
Static charging due to insufficient potential equalisation
Explosion hazard!
▷ Make sure that the connection between pump and baseplate is electrically
conductive.
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
To check the clearance gaps, the impeller or the two impellers (of two-stage pumps)
must be removed. (ðSection7.4.6,Page46)
If the clearance gap is larger than permitted (see the following table), fit new casing
wear rings 502.01-0.04.
The clearance gaps given refer to the diameter.
Table19: Clearances between impeller and casing / between impeller and casing
wear ring
Nominal diameter of the
discharge nozzle
CTN-G/-C CTN-GH/-CH
up to and including DN 100 0.50 mm
+ 0.1
0.50 mm
+ 0.1
DN 125 and above 0.70 mm
+ 0.1
0.70 mm
+ 0.1
NOTE
If the clearances given are exceeded by more than 1 mm (referring to the diameter)
replace the affected components or restore the original clearance by means of a
casing wear ring.
Contact KSB.
7.2.2.3 Cleaning filters
CAUTION
Insufficient inlet pressure due to clogged filter in the suction line
Damage to the pump!
▷ Take appropriate measures to monitor contamination of filter.
▷ Clean filter in appropriate intervals.
7.2.3 Lubrication and lubricant change of thrust bearings (rolling element bearings)
DANGER
Excessive temperatures as a result of thrust bearings (rolling element bearings)
running hot or defective bearing seals
Explosion hazard!
Fire hazard!
Damage to the pump set!
▷ Regularly check the condition of the lubricant.
7.2.3.1 Grease lubrication
The bearings are supplied packed with high-quality lithium-soap grease.