Cummins/Onan LS-15M — P7 Axial Alignment Procedure
Adjustments · Generator to engine alignment
For the Cummins/Onan LS-15M, from the Cummins/Onan service manual.
Applies to: Cummins/Onan DFAA, Cummins/Onan DFAB, Cummins/Onan DFAC, Cummins/Onan DFBF, Cummins/Onan DFCB, Cummins/Onan DFCC, Cummins/Onan DFCE, Cummins/Onan DFE
Procedure
- Check only when an objectionable vibration is present.
- Remove the capscrews connecting drive discs and flywheel.
- Mark the drive discs and flywheel with respect to each other.
- Rotate engine or generator so drive discs holes are repositioned two bolt holes from original location.
- Put capscrews back in and retorque. Recheck/record vibration levels.
- Repeat this test until drive disc holes are repositioned 180 degrees from original location.
- Review vibration data and position drive disc in lowest recorded level location.
Full service-parts list: Cummins/Onan DFBF →, Cummins/Onan DFCC →, Cummins/Onan DFCE →, Cummins/Onan DFE →
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.