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  The first digit in the model number indicates the series of the tractor. John Deere has nine series, numbered 1 through 9. As the series number gets bigger, the tractor generally increases in size and capabilities.

• The next three digits after the series number represent the approximate engine horsepower of the tractor. So, in a model like “5090EL”, “090” indicates about 90 horsepower.
• The letter following the horsepower digits denotes the tractor’s capability level or trim package, with ‘E’ models having basic features, ‘M’ models being mid-tier, and ‘R’ models being fully featured or premium offerings.
• A second letter (if present) indicates the tractor’s specific configuration, such as a narrow setup or a high clearance (‘H’ for high crop), or if it’s equipped with tracks instead of wheels.

For example, in the 6120E, 6120M, and 6120R models, the “6” refers to the series, “120” indicates the horsepower, and the letters “E”, “M”, and “R” indicate increasing levels of features and capabilities. The “6155RH” model, with the “H” at the end, specifies that it’s a high-crop tractor.

Keep in mind that the older models, before 2008, might not follow this system, and the best way to get accurate information for those would be to consult the manual or contact John Deere directly.

For lawn tractors, the model number can give you information about the product line, engine power, and sometimes the cutting width or other specific features. However, it’s important to note that this might not always be consistent across all models or series.

For the most accurate interpretation of your tractor’s model number or if you need more detailed information about its features, specifications, or year of manufacture, it’s recommended to check the official John Deere website or contact a dealer directly​ (LasseterEQ)​​ (Prairie State Tractor)​​ (Mechanics news)​.