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Cummins/Onan — WARNING

For these Cummins/Onan models: Contractor, UN Revolving Armature, 4-Pole.

Applies to: Cummins Onan Contractor

Before you start

  • 5. Remove spark plugs. Pour 1 ounce (2 tables- poons or 28 grams) of rust inhibitor or SAE #50 oil into the cylinders. Crank the engine over a few times. Reinstall spark plugs.

Procedure

  1. Remove spark plugs. Pour 1 ounce (2 tables-
  2. Service air cleaner as outlined in Maintenance
  3. Clean governor linkage and protect by wrapping
  4. Tie a plastic bag over the exhaust outlet to pre-
  5. Wipe entire generator set. Coat rustable parts
  6. Provide a suitable cover for the entire unit.
  7. Remove cover and all protective wrapping.
  8. Check tag on oil base and verify that oil viscosity
  9. Clean and check battery. If the electrolyte level is

Source: manual:940-0120 Onan NH (spec P) Genset Operators manual (10-1983).pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.