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Cummins/Onan QST30 / QST30 G-Drive — Starting Procedure After Extended Shutdown or Oil Change

Maintenance · Engine

For the Cummins/Onan QST30 / QST30 G-Drive, from the Cummins/Onan service manual.

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

Parts for this job

Part numbers from the service-parts list for Cummins/Onan QST30. Verify against your serial number before ordering; some links are affiliate links.

Procedure

  1. Complete the following steps after each oil change or after the engine has been shut off for more than 120 hours.
  2. Disconnect the multi-pin cable from both fuel pumps.
  3. Rotate the crankshaft, using the starting motor, until oil pressure appears on the gauge or the warning light goes out.
  4. Reconnect the multi-pin cable to both fuel pumps.
  5. Start the engine.

Full service-parts list: Cummins/Onan QST30 →

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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