7 Servicing/Maintenance
48 of 72
HPK
7.2.2.2 Checking the clearances
To check the clearance gaps, remove the back pull-out unit.
(
ð
Section 7.4.4, Page 51)
If the clearance gap is larger than permitted (see the following table), replace casing
wear ring 502.1/502.2 with a new one.
The clearance gaps given refer to the diameter.
Table 20:
Clearance gaps between impeller and casing/between impeller and casing
wear ring
Sizes
150-630
0.7 + 0.1 mm
200-670
0.7 + 0.1 mm
250-630
250-710
0.85 + 0.1 mm
0.7 + 0.1 mm
300-630
300-710
0.85 + 0.1 mm
350-630
350-710
0.85 + 0.1 mm
400-504
400-506
400-630
400-710
0.85 + 0.1 mm
For temperatures exceeding 250 °C, contact KSB.
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!
▷
Monitor contamination of filter with suitable means (e.g. differential pressure
gauge).
▷
Clean filter at appropriate intervals.
7.2.3 Lubrication and lubricant change of rolling element bearings
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.
7.2.3.1 Oil lubrication
The rolling element bearings are usually lubricated with mineral oil.