Serial Number Searches

As the interest in New Generation Tractors has grown, the Two-Cylinder Club has been receiving many requests for Serial Number Researches. However, unlike two-cylinder tractors, researching New Generation Tractors requires more information from the owner than just a series of numbers. This is because of the way the information was recorded in the Serial Number Registers.

To be able to accurately research New Generation Tractors, we need all of the information contained on the serial number plate, not just the numerical digits. On Waterloo-built tractors prior to the 1965 model year, the serial number contains two digits followed by a “T”, and then the actual serial number. For example, 22T 01337 is the serial number of a “4010” Standard. The first number, “2”, is the series type (4000 Series); the second number, “2”, denotes chassis type (Standard); the “T” stands for “tractor,” and the final five digits represent the numerical order of the tractor. In and of itself, this group of five digits is not the complete serial number. To be able to correctly perform the research, we need all of the information, not just the final five digits, as just the numbers alone could apply to many different models.

Beginning with the 1965 model year, the information provided on the serial number plate was expanded. A three-digit code was used to denote series, chassis, and fuel type; a letter code was added to denote transmission type; and then came a six-digit series of numbers followed by an “R”, such as 233R092080R. It is absolutely vital that all of this information is provided to be able to correctly identify the tractor and perform accurate Serial Number Research. From 1965–up, with some minor variations, the serial number plates of all Waterloo-built tractors were stamped in this manner. Some later versions have “SNT” as a prefix.

The Dubuque-built “10” Series Tractors used a different system of serial number identification. A serial number plate was riveted to the cylinder block of the engine. The type of tractor was indicated by a letter code consisting of one to three letters, followed by the sequence number, and ending with a “T”. The “T” designates the Dubuque factory, while “R” designates Waterloo.

The serial number system at Dubuque was changed with the introduction of the “20” Series Tractors. The serial number plate on these tractors is located on the right side of the transmission case, just above the footrest. The serial number of a “1020”, for example, looks like this: 4R1C-010001T. Without the first four numbers and letters, we cannot determine anything about the tractor, so including this information in your Serial Number Research request is absolutely necessary.

The Two-Cylinder Club can also do serial number researches on Waterloo-built Generation II Tractors up to about midway through the “50” Series. Generation II serial number sequences are different than the New Generation Tractors and, as before, we need all of the information provided on the serial number plate to accurately research these tractors. The same is true of Dubuque-built tractors, although the cut-off date of available records is yet to be determined. Certainly, however, records are available through the New Generation “30” Series.

Here is an in depth listing of the New Generation Tractors that can be searched.


Two-Cylinder Club
P.O. Box 430
Grundy Center, IA 50638-0430
1 888-782-2582 or 1 319 824-6060


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