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The Hydropump has an open face impeller
which was precisely set at the factory. Under
normal operating conditions it is not necessary
to make further adjustment, however, if the
pump draws excessive current a slight adjust-
ment may be required.
Loose the shaft extension set screws and
this will allow the mechanical seal spring to
force the impeller face to touch the volute.Place
a screwdriver between the motor bracket and
the shaft extension as depicted below. Move the
screwdriver handle away from the motor, this
will pull the impeller away from the volute. You
should move the shaft extension about 1/32”
and holding the screwdriver at this position firm-
ly tighten the shaft extension set screws.
Start the pump and check the amperage
draw. If the amperage exceeds the nameplate
rating or if the pump performs poorly the adjust-
ment needs to be redone.
6 3
IMPELLER CLEARANCE ADJUSTMENT