13. Impeller clearance inspection
For pumps fitted with open S-tube
®
, the impeller clearance is the distance between the bottom of the impeller and the suction cover.
The correct impeller clearance is required to maintain the hydraulic performance of the pump and to prevent clogging.
CAUTION
Hot surface
Minor or moderate personal injury
‐ Check the impeller clearance every time service is carried out to prevent hot surfaces in the hydraulic parts.
Clearance sizes for open S-tube
®
impellers
Pressure range
Impeller clearance
[mm]
All 0.5 ± 0.1
DANGER
Electric shock
Death or serious personal injury
‐ Before starting any work on the product, make sure that the power supply is switched off and that it cannot be switched on
unintentionally.
The impeller clearance of vertical, submerged installation types is inspected directly through the pump inlet.
13.1 Impeller clearance adjustment parts
Tighten the set screws carefully to avoid damage to the bearings.
TM1040240
Tip gap adjustment parts
Pos. Description
1 Suction cover
2 Set screw
3 Fastening screw
4 Suction flange
89
English (GB)
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