Pioneer PB Series, Operation & Maintenance Manual

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15
ROTATING ASSEMBLY
The power source must be removed prior to removing the rotating assembly. Drain the oil in
the seal cavity by removing the seal cavity drain plug. Clean and replace the drain plug after
draining seal cavity of oil. Remove the four (4) nuts on studs of the volute, and use the
jackscrews to remove the rotating assembly from the volute. Separate the rotating assembly by
pulling straight away from the pump casing.
IMPELLER
With the rotating assembly removed from the pump casing, remove the impeller lock screw and
unscrew the impeller from the shaft. The impeller was installed at the factory using Loctite®
and so may be fairly difficult to unscrew. A propane torch can be used to ease loosening the