Cannon CT-500, Instruction & Operation Manual

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34 CT-500 Instruction Manual
whenever the impeller is bumped or if there is any suspicion that the blade segments may have
become misaligned.
Shaft Run-Out Correction
The following procedure is suggested to correct shaft run-out. CANNON advises the impeller is
removed while carrying out this procedure.
1. Grasp the motor firmly with the left hand and touch the tip of a soft crayon (a glass marking
pencil, for example) momentarily to the side of the shaft near the impeller end while the motor
is running. The mark produced by the crayon will be evident as a line part way around the shaft.
2. Disconnect the motor, hold the motor tightly against the body, and grasp the shaft in the right
hand. Bend the shaft away from the line segment on the shaft.
3. Repeat the test procedure, marking the shaft at a location slightly removed from the first crayon
mark.
4. If the mark appears at the same side of a shaft as the first mark and is about the same length,
the bending was not great enough to alter the condition and should be repeated with more
force applied. Likewise if the mark has shifted to the opposite side the force was too great, and
the shaft must be bent back with less force to correct the alignment.
This is a trial-and-error process which usually must be repeated several times. When the crayon
makes a line at least two-thirds of the way around the shaft, the run-out has diminished to an
acceptable level. A uniform line completely around the shaft would indicate no run-out detectable
by this procedure.