Which serial number do I need?
A tractor carries several numbers stamped in metal, and they answer different questions. The tractor’s own serial number identifies the machine. The engine, the transmission and the axles often carry numbers of their own, and a part that changed during production usually changed at one of those numbers. Find the right one before you look anything up.
Which numbers does a tractor carry?
| Number | What it identifies | Use it for |
|---|---|---|
| Tractor serial number, PIN or VIN | The whole machine, as the maker recorded it | Which model and version it is, the maker’s or dealer’s build record, registration, theft checks, recalls |
| Engine serial number | The engine, often built by another company with its own numbering | Engine parts: many changed at an engine number, not a tractor number |
| Transmission number | The gearbox | Gearbox and clutch parts |
| Axle numbers | The front and rear axles or final drives | Axle, hub and final-drive parts |
| Other plates | A cab, a loader or a roll-over frame fitted later | Parts and certification for that item only |
When a parts list says “from serial number …”, check which number it means before you order.
Why isn’t the year of manufacture enough?
Makers change parts part-way through production, at a serial break, not on the first of January. Two tractors built in the same year can take different parts, and the break is often on the engine’s number rather than the tractor’s. Parts catalogues are written against serial numbers for that reason. Knowing the year narrows it down; the right serial number answers it.
Can I tell the year from the serial number?
Only where the maker has published a rule or a table for that model and period. For many tractors no rule is published, and a year worked out from a guess is worse than no year. What we know for certain:
- EU rules do not require a tractor’s identification number to show its year of manufacture. Some makers include one; many do not. The plate required on an EU-approved tractor is set out in Commission Implementing Regulation (EU) 2015/504, Annex IV, which lists what the plate carries and asks for no year.
- ISO 10261 is written for earth-moving machinery; EU tractor rules allow makers to use it. Under it the year is optional: a maker may mark it, and the standard recommends position 10 if they do.
- US road-vehicle rules do not cover farm tractors. The year letters in 49 CFR 565 apply to cars, trucks, trailers and motorcycles. A tractor’s identification number may look similar; do not assume it uses that table.
- Kubota offers a Retail Date Lookup on its US website, by model and serial number, and publishes no rule for working out a year from the serial itself.
Where no rule exists, the reliable answers are the maker’s or a dealer’s build record for that serial number, date codes cast into major parts such as the engine block or transmission housing, and date stamps on components.
Where is the serial number plate?
It depends on the maker, the market and the period, and we show a position for a tractor only where a source we can check states it. Two general rules are written down. EU Implementing Regulation 2015/504 asks that plates added at later approval stages go “in a conspicuous and readily accessible position to a part which is not subject to replacement during normal use, regular maintenance or repair”. ISO 10261 prefers the plate on the left-hand side of the machine and, on large machines, the stamped number on the right-hand side near the front.
What serial numbers does WhichTractor show?
Serial numbers exactly as a source prints them: ranges, year-by-year tables and the first or last machine built, each with its source. We never work out a year from a serial number, and where a source does not say whether a number is the tractor’s or the engine’s, we say so. So far 80 of the 3,122 tractors on the site have a serial answer on their page, and these have a page of their own: