1. Before mounting the impeller, check that the sleeve moves freely up and down by
pushing on it. See the following figure.
When the sleeve is released, it should be fully pushed out again. If the sleeve does not
move freely, or does not come fully out, then replace the impeller unit.
2. 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.
3. Mount the impeller sleeve and impeller, and secure the impeller in place with the
screw.
4. Check that the impeller is in its lowest position:
a) Insert two screwdrivers as shown in the following figure, and push the impeller
downwards.
6 Maintenance
60 Flygt 3085 Installation, Operation, and Maintenance Manual
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