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How old is my Cummins/Onan generator?

Serial number age decoder for Cummins/Onan standby and portable generators: 1 format era, the decode rule in plain English, transcribed tables, and the official lookup.

Format eras

era not stated UNSOURCED
no date in serial

How to read the serial

era not stated formatUNSOURCED

Documented but not evaluated by the decoder: no pattern (no date encoded, or format unknown).

Trap: No source fetched.

Where the data plate is on a generator

Standby units: a plate inside the enclosure or on the frame near the controller. Portables: a sticker on the frame or engine housing.

General guidance, not brand-specific: the owner's manual or the installer can point to the exact spot. See the data plate guide.

For scale only: the InterNACHI Standard Estimated Life Expectancy Chart for Homes lists Residential Propane Backup Generators at 12 years of expected service (nachi.org). That chart is a guideline, not a prediction for your unit.

Official lookup

No online serial lookup was found for Cummins/Onan in our research. The manufacturer's customer service line, the installer's invoice, or a printed date on the plate are the remaining authorities.

What we could not confirm

The era not stated format has no source we could check; it is shown for completeness only.
The era not stated format is documented but not decodable here: no pattern (no date encoded, or format unknown).
No official online lookup URL was verified for Cummins/Onan.
UNSOURCED: cummins.com returns 403 to curl and WebFetch; quickserve.cummins.com is a login shell. Onan serial/spec-letter date decoding not verified.

Sources

https://quickserve.cummins.com/official