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MVA 02 rev 5 - December 2017
Photo 8
4.- Fix the central bolt onto the motor shaft: fit the
impeller fixing screw (12) with relative spring
washer into the central unthreaded hole in the disk
and fix it onto the motor shaft (Photo 9). Tighten the
bolt until the tightening torque indicated in Chart
12.1 is reached.
Note that the 4 threaded holes on the disk are not
used. These holes are used only when the impeller
is dismantled.
Photo 9
5.- Check clearance between the impeller and the
casing: after assembly has been completed, check
that the impeller is correctly centred with respect to
the casing. If necessary, move the motor or adjust
the motor base. When the impeller has been
centred, tighten all fixing bolts of the base and the
motor, respecting the tightening torque values
indicated in Chart 12.1.
12
