Cummins/Onan — Axial Alignment Procedure (Aligning Generator with Engine)
Adjustments · Generator/engine drive disc coupling
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan DQAD, Cummins/Onan DQAE, Cummins/Onan DQAF
Procedure
- Fasten a dial indicator holding device to skid base, engine block, or generator shell.
- Position the indicator sensor point on the generator shaft hub.
- Bar the engine over in a clockwise rotation through a couple of rotations.
- Record indicator readings in eight equally spaced points around the shaft diameter.
- To correct out-of-tolerance T.I.R., remove drive disc capscrews and mark discs and flywheel.
- Rotate engine or generator so drive disc holes are repositioned 180 degrees from original location.
- Reinstall capscrews and retorque; recheck alignment.
- If T.I.R. is unchanged, rotate discs 30, 60, or 90 degrees from original location.
Tools required
- Dial indicator holding device with magnetic base or clamp Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Optimal T.I.R. for runout would be .000 inch
- Recommendation is to reduce the measured T.I.R. runout by one half
Full service-parts list: Cummins/Onan DQAD →, Cummins/Onan DQAE →, Cummins/Onan DQAF →
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.