– For the standard variant, remove the screws and the suction cover.
– For the abrasive resistant variant, remove the screws and the pump housing.
2. Remove the impeller screw.
Prevent the impeller from rotating.
3. Remove the impeller:
– For the standard variant, remove the impeller and the sleeve.
– For the abrasive resistant variant, remove the impeller, the spacer, and the sleeve.
6.5.2 Install the D-impeller
1. Prepare the shaft:
a) Polish off any flaws with a fine emery cloth.
The end of the shaft must be clean and free from burrs.
b) Coat the inner conic and the outer cylindrical surfaces of the sleeve with a thin layer
of grease.
The proper lubrication is grease for bearings, for example Exxon Mobil Unirex N3,
Mobil Mobilith SHC 220 or equivalent.
NOTICE:
Surplus grease can cause the impeller to become loose. Remove surplus grease
from conical and/or cylindrical surfaces of shafts and/or sleeves.
2. Prepare the impeller:
– For the standard variant, insert the sleeve into the impeller.
– For the abrasive resistant variant, insert the spacer and the sleeve into the impeller.
Standard variant Abrasive resistant variant
3. Mount the impeller:
a) Lubricate the threads of the impeller screw.
Always use a new screw.
b) Fit the impeller to the shaft.
c) Fit the impeller screw to the shaft.
d) Tighten the impeller screw.
Prevent the impeller from rotating.
For tightening torque, see Torque values on page 37.
4. Cover the impeller:
– For the standard variant, install the suction cover and tighten the screws.
– For the abrasive resistant variant, install the pump housing. Tighten the screws.
6 Maintenance
Flygt 3069 Installation, Operation, and Maintenance Manual 43
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