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5.
IMPELLER ADJUSTMENT - Ref Fig 12
Gland Packed or Mechanically Sealed Pumps:
Initial Adjustment
For optimum hydraulic performance, pumps should be adjusted to operate with the Impeller having minimum
axial clearance with the front casing liner.
I.
Adjustment of Impeller front-end clearance is carried out as follows:
II.
Rotate the Shaft clockwise (as viewed from the drive end) by hand, and move the Bearing Assembly
forward (towards the pump suction) by adjusting the rear nut on the ADJUSTING BOLT (MMAB)
until the Impeller rubs on the front Liner.
III.
Unscrew the rear nut by one sixth of a turn, and move the Bearing Assembly back by adjustment of the
front nut on the Adjusting Screw until the lug on the Bearing Assembly contacts the rear nut. Fully
tighten the front nut to secure the Bearing Assembly in position.
IV.
Ensure that the Shaft can now rotate freely without contact of the Impeller with the front Liner. If
contact occurs, repeat step (II).
NOTE:
After each Impeller adjustment is completed, the BEARING HOUSING CLAMP BOLTS must be
tightened.