Cummins/Onan 1750DQKB — Axial Alignment Procedure
Adjustments · generator to engine alignment
For the Cummins/Onan 1750DQKB, from the Cummins/Onan service manual.
Applies to: Cummins/Onan 1750DQKB, Cummins/Onan DQKB, Cummins/Onan DQKC
Procedure
- Perform only when an objectionable vibration is present.
- Fasten dial indicator holding device to skid base, engine block, or generator shell so the sensor rests on the generator shaft hub.
- Bar the engine over clockwise through a couple of rotations and record readings in eight equally spaced points around the shaft diameter.
- To correct out-of-tolerance T.I.R., remove the capscrews connecting drive discs and flywheel; mark drive discs and flywheel.
- Rotate engine or generator so drive disc holes are repositioned 180 degrees from original location; retorque capscrews.
- Re-check shaft alignment; if unchanged, rotate discs 30, 60, or 90 degrees from original location.
- If T.I.R. still does not improve, inspect flywheel pilot and drive disc runouts.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Goal is to reduce measured T.I.R. runout by one half
- Optimal T.I.R. runout would be .000"
Full service-parts list: Cummins/Onan 1750DQKB →, Cummins/Onan DQKB →, Cummins/Onan DQKC →
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.