Grundfos Peerless Pump 8196 Series, Installation, Operation And Maintenance Manual

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BEARING IDENTIFICATION
MRC - SKF OR EQUAL
IMPELLER CLEARANCE ADJUSTMENT
If a gradual loss in head and/or capacity occurs, performance may be restored by adjusting the impeller. If
performance cannot be restored by adjustment, the pump should be disassembled and impeller and casing
inspected for wear. Impeller clearance is the measurement between the edge of the impeller vanes and the
surface of the casing. The following table should be used as a guide for setting the impeller clearance under
various operating temperatures.
FEELER GAUGE ADJUSTMENT OF IMPELLER CLEARANCE
(a)
LOCK OUT POWER SUPPLY TO MOTOR.
(b)
Remove coupling guard. Loosen jack bolts (370D) and jam nuts (423). Tighten bearing housing bolts
(370C) evenly, while slowly rotating the shaft until the impeller just starts to rub on the casing. Using
a feeler gauge; set the gap between the three housing bolts (370C) and the bearing housing. Set the
gap according to the table as required. SEE
FIGURE D.
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