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Home›Repair guides›Cummins/Onan›Engine Start-Up

Cummins/Onan — Engine Start-Up

Operation

From a Cummins/Onan service manual covering: QST30, QST30 G-Drive, QST30-G3. Check it applies to your exact model before use.

Applies to: Cummins/Onan QST30-G3, Cummins/Onan QST30 engine

Before you start

  • Do not idle the engine for excessively long periods; more than 10 minutes can cause carbon buildup, clogged injector spray holes and sticking valves.

Procedure

  1. Start the engine with the IDLE/RUN switch (using the idle feature) in the idle position.
  2. Do not engage the starting motor more than 30 seconds; wait two minutes between each start attempt.
  3. Engine oil pressure must be indicated on the gauge within 15 seconds; shut off immediately if none.
  4. Idle the engine three to five minutes between 700 and 900 RPM before switching to Rated Speed RPM.
  5. When starting a cold engine, increase engine speed slowly from Idle to Rated Speed.
  6. Do not idle the engine for excessively long periods; long periods of idling, more than 10 minutes, can damage an engine.

Specs & values

  • Idle 700 to 900 RPM

Full service-parts list: Cummins/Onan QST30-G3 →

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.

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