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Copyright 2017 Cummins Inc.
P7 Axial Alignment Procedure
Axial misalignment needs to be checked only when
an objectionable vibration is present.
If excessive vibration remains after the angular
alignment, concentric alignment of the alternator
shaft/engine crankshaft axes may be at fault.
The goal of the axial realignment is to reduce the
vibration level of the generator set while it is operat-
ing. A small improvement in the axial alignment may
have dramatic effects in the measured or physically
observed vibration levels.
To correct for possible axial misalignment, remove
the capscrews connecting drive discs and flywheel.
Mark the drive discs and flywheel with respect to
each other. Rotate either the engine or alternator so
that drive discs holes are repositioned two bolt
holes from their original location. Put the drive discs
capscrews back in and retorque. Recheck/record
vibration levels as before. Repeat this test until the
drive discs holes are repositioned 180 degrees from
their original location.
Review vibration data and position drive disc in low-
est recorded level location.
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