Cummins/Onan 5.5 NH / 6.5 NH — To Return to Service (after out-of-service protection)

Maintenance · generator set

For the Cummins/Onan 5.5 NH / 6.5 NH, from the Cummins/Onan operator's manual.

Applies to: Cummins/Onan NH engine

Procedure

1. Remove cover and all protective wrapping; remove plug from exhaust outlet.
2. Check tag on oil base and verify that oil viscosity is still correct for existing ambient temperatures.
3. Clean and check battery; if electrolyte level is low, add distilled water and charge. DO NOT OVERCHARGE.
4. Check that fuel filter and fuel lines are secure, with no leaks.

Source: Cummins/Onan operator'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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