Finding a tractor part number from the old part

The part is on the bench: worn, greasy, sometimes broken. To order a new one, you need its manufacturer’s part number. That number links your request to the right part, whoever the supplier is. Finding a tractor part number takes a few minutes when you know where to look. Otherwise, you get the wrong part, a return, a delay and a customer left waiting.

Here is the method, step by step. It works just as well for combines and balers.

Where to read a tractor part number

On the part itself. Most parts carry their number stamped, engraved or cast into the metal. You will find it, for example, on the hub of a clutch plate, on the pressed steel of a clutch cover or on a pump body. Some parts also have a small riveted plate.

To read it, first clean the area with degreaser and a brush. Then light it from the side, holding a torch almost flat: stamped figures stand out in relief. If it is still hard to read, rub a little chalk over the surface and wipe it off. The chalk stays in the hollows.

On the packaging or the invoice. If the old part was bought from you, the number is on your invoice or in your sales history. Likewise, the original packaging always carries it, if anyone kept it.

In the manufacturer’s parts catalogue. A parts catalogue shows the machine in exploded views. Each part carries a reference number that leads to a list with its description and part number. To use it, you need the exact model and often the machine’s serial number, because builds change during production. For older machines, paper catalogues are often still the safest source.

Copying a tractor part number correctly, make by make

A part number is copied in full, character by character. Each make numbers parts its own way, and the details people forget are always the same:

Make	Examples from our catalogue	Don’t forget
Massey Ferguson	6223296M1, 3586769M92, 044704T1	The suffix (M1, M92, T1) is part of the number
Deutz	02239591, 04231109, 2329613	The leading zero, when there is one
Claas	804405.0, 804585.1, 0803901	The digit after the point
Sonalika	703405378AFG, 10007595AA	The letters at the end

On the needle roller for Markant 50 balers, for example, the full number is 804405.0. Leave out the “.0” and a search may return another part, or nothing at all.

Watch out, too, for characters that look alike: O and 0, I and 1, B and 8. On a worn, stamped part, doubt is common. In that case, it is better to say so than to guess.

Oil seals

An oil seal often carries its size in millimetres: inside diameter, outside diameter and width, for example 60 × 80 × 10. These sizes are useful, but they are not always enough. Two seals of the same size can have different lips or materials, depending on where they sit in the machine. So note the part number and the position of the seal too. Our agricultural oil seals are listed with their sizes and manufacturer’s part numbers.

When the tractor part number has worn away

Sometimes a part that is rusty, reground or broken where the marking was tells you nothing. In that case, you identify it another way, in three steps.

1. Measure. First note the diameters, the thickness, the number of teeth or splines and the distance between fixing holes. For example, the 51-tooth Deutz gear is recognised first by its number of teeth.

2. Photograph. Shoot the part from the front, from the side, and next to a tape measure or rule so the scale is clear. In practice, one sharp photo in daylight beats ten blurred ones.

3. Note the machine. Write down the make, model, serial number and, if possible, the year. The serial number is on the manufacturer’s plate, often on the chassis or under the seat.

With these three elements, a part with no marking can be identified in the vast majority of cases.

Versions, licences, superseded numbers: the traps

One model, several builds. Manufacturers change their machines during production. As a result, two tractors of the same model, built a few years apart, can take different parts. That is why the serial number matters as much as the model name.

Machines built under licence. Some tractors are assembled under licence in a country other than the manufacturer’s. Cirta tractors, derived from Deutz models, are one example. They use most of the original parts, but not necessarily all of them. You then need to give the version, not just the base model.

Superseded part numbers. Over the years, a manufacturer sometimes replaces a part number with a new one when the part changes. The old number is still useful, however: it leads to the new one by cross-reference.

For dealers: keep a cross-reference file

If you sell parts, a simple spreadsheet will save you a great deal of time. One row per part, with the manufacturer’s part number, the description, the machines it fits, your supplier’s reference and the date of the last order. That way, when a customer asks for a manufacturer’s number, you find the part in seconds.

At Valmy France, every part has its own Valmy France reference, and every product page shows the matching manufacturer’s part number. So you can order from us directly with manufacturers’ numbers: we make the link. The same file also helps you build your spare parts stock before the season, based on what you actually sell.

Tractor part number: your questions

Can I order with just a photo?

Yes. A sharp photo, with the scale and the main measurements, is often enough to identify the part. However, for an order in quantity, we confirm the part number with you before shipping.

The stamped number gives no results online: is it wrong?

Not necessarily. Many older part numbers appear in no online catalogue, yet they are listed in the manufacturer’s paper catalogues. Send it to us exactly as you read it, with a photo.

The manufacturer no longer supplies the part: what now?

Send us the part number or a photo through our contact page. If the part isn’t in our catalogue, we will tell you whether we can make it from the original.