To take what Ryan said a step further, the numbering sequence means more than a series.
Lets use the 1X8/9 series.
All the even numbers are gear drives: 86, 108, 128
The odd numbers are hydrostats: 109, 129, 149, 169
The first numbers are the engines size: 86= 8 HP; 108/9= 10 hp; 128/9= 12 HP and 169= 16 hp.
Why the smallest tractor in these series doesn't follow this set of rules I do not know. The 86 is part of the 1X8/9's, the 73 is part of the 1X6/7 series.... It's weird. Now, this number pattern stopped at the QL (Quietline) series 800-1650. After that, the tractor/series numbers really do not mean anything.
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