6.4.9 Adjust the impeller
Table 11: Applicability
Product code Pressure class Open or closed impeller
2190.010 HT Open
2201.012 MT, HT Open
2201.020 LT Open
2201.320 MT, HT Open
2201.590 MT, HT Open
2201.690 MT, HT Open
2201.691 MT, HT Open
In order for the pump to perform at maximum capacity, the impeller must be adjusted
regularly. The impeller clearance should be minimal when the impeller is tightened. Use
the adjusting washers to adjust the clearance.
Pumps that are equipped with polyurethane covering are extremely resistant to wear. If
the impeller does not rotate freely, then the friction generates a lot of heat. This can result
in deformed wear parts, a stuck impeller, or damage to the pump. The impeller clearance
should be 0.2–0.3 mm (0.008–0.012 in) when the impeller is tightened.
1. Check that the impeller can rotate freely.
2. Turn the adjusting nuts down to the bottom of the studs.
MT: Check that the spacers are seated on the studs.
6 Maintenance
52 Flygt 2190, 2201 Installation, Operation, and Maintenance Manual
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