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315-437-0361 or 800-448-1668         

Fax: 315-463-9561     

web: www.oberdorfer-pumps.com

1. Remove Pump Cover. 

This exposes the centrifugal impeller.

2. Remove Pump Impeller

(SEE FIGURE 1) The impeller is threaded onto the shaft.

Unscrew impeller from shaft by shocking with screwdriver
and hammer. 

Note

that all impellers unscrew in the same

direction as the pump rotates. Thus, the impeller unscrews
counter clockwise when facing the open end of the pump.
However, Model 800B has left hand threads and unscrews
clockwise.

Usually the shock force alone is sufficient to

unscrew the impeller. In extreme cases it may be necessary to
restrain the shaft. For pedestal centrifugal pumps, the exposed
drive end of the shaft can be clamped in a vise and restrained
accordingly. For pumps close coupled mounted to electric
motors, restrain the shaft via the screwdriver slot in opposite
end of motor shaft. (SEE FIGURE 2) The impeller hub exten-
sion may also be gripped with a pipe wrench, channel lock, or
vise  grip to loosen and remove it.

If motor does not have a screwdriver slot in opposite

end of shaft, restrain motor shaft by inserting screwdriver
through air openings in motor body to bear against fan or
cooling air projections of motor armature. Exercise care not
to damage motor fan or armature. 

3. Remove Pump Body (or pump casting containing the
seal)

On some models, the pump body is clamped to motor

adapter by a single bolt. Loosen nut and slide pump body off.

On other models, the seal is contained in the pedestal

bracket or adapter to the motor.

Centrifugal Pumps:

Seal Replacement Instructions

The following instructions are general. Although the illustrations may not depict the specific centrifugal 

pump model you are concerned with, the seal components are similar for all centrifugal pumps.

FIGURE 1

FIGURE 2

*Teflon® is a registered trademark of DuPont.
Permatex® and Locktite® are registered trademarks of Locktite Corporation.

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