I don't have a book in front of me to tell you the exact power, but it's around 30-32 range on the PTO. The serial number is probably given as the "tractor number". The UNIT number is the build date which is more important anyway when it comes to ordering parts. Ford did not differentiate by serial number, but by build date/production month and year, so the UNIT number is all you need, and the model number if you're not sure of the exact components fitted. The UNIT number decodes as YEAR, Month (letter), day of month, and production shift (letter). The year numeral corresponds to to that year of the decade eg. 5='85, 6='86 and so on. The letter for the month works the same way. "A" for January, "B" for Febuary, etc. excepting the letter "I". The last letter is simply the shift of the day. "A" was Midnight, "B" was the morning(day) shift, and "C" was the afternoon shift....
The other component codes on the tractor decode in the same manner. If you've got one with a code that's outside of say 3 months of all the others (by finding the stamped numbers on the component), then it's likely a mutt that somebody put together....The model numbers of those tractors had no reflection on the power rating of the tractor. Some were close, but that was mere coincidence. The model numbers were derived from the thousand series which was the 2000, 3000, 4000, 5000, 7000, 8000, and 9000. The second major revision of the series brought in the "600" and "700" designations so they became 2600 3600, 4600, 5600, the 6600 and 6700 flat deck were added, 7600, 7700 flat deck, 8600, 9600, next revision were the 8700 and 9700.
This was followed by the 10 series revision where "10" was added to those models excepting the 2 largest which became the "TW" series. Other models were added, depending on the power spec and axle layout such as the 2310, 2910, 3910, 4110.... They were just fitted in.
The models numbers have nothing to do with their PTO power.
Form the late 90's up until perhaps a year ago the model numbers of CNH tractors did reflect their ISO brake engine power rating.... eg TS90, TM135, MX270, etc. Rod
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