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Cummins/Onan — Normal Starting Procedure

Operation · engine

From a Cummins/Onan owner's manual covering: 6C8.3, 6CT 8.3, 6CTA8.3. Check it applies to your exact model before use.

Applies to: Cummins/Onan 6CTA8.3, Cummins/Onan C Series, Cummins/Onan 6CT8.3 engine

Before you start

  • Do not engage the starting motor more than 30 seconds; wait two minutes between attempts

Procedure

  1. Disengage driven unit or put transmission in neutral.
  2. Position fuel shutoff, electrical switch or control to run.
  3. Industrial: set throttle at idle. Automotive: depress accelerator fully and release.
  4. Engage starting motor; do not crank more than 30 seconds.
  5. Wait two minutes between each attempt to start.
  6. Engine oil pressure must be indicated within 15 seconds after starting.
  7. When cold, increase engine speed slowly to stabilize oil pressure.
  8. Idle 3 to 5 minutes at 1000 RPM before operating with a load.

Specs & values

  • Oil pressure indicated within 15 seconds after starting
  • Idle 3 to 5 minutes at 1000 RPM before loading

Full service-parts list: Cummins/Onan C Series →

Source: Cummins/Onan owner's 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.

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