Can anyone decipher the numbers on the sticker? Thank you.
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Unit number 9E17B should be 1979, May 17, 2nd shift. Model DD314K I'm not sure on... Closest I can find in my books is DD114K which is a 535 industrial tractor with a 201 diesel engine, 6x4 manual reversing transmission, and 540 independent PTO.
Maybe the books I'm looking in are too old, and this is a series 10 tractor? That would make the date 5/17/89.
 
OK, after doing some searching I've found a document, from Sean in PA I think, clears up the DD314K DD3=545, 1=diesel, 4=Independent 540 PTO, K=6x4 manual reversing.

I'm pretty pumped about Ind PTO! We haven't tried it yet without the clutch being depressed, just wanted to find out for sure to prevent unnecessary grinding.

Still no clue on everything else. A few people have mentioned the 545 S/N would fall in with the 4610s sequencing.
 
Yup, the 4 in that position means 540 rpm independent PTO. You shouldn't get any grinding engaging the PTO with the clutch in any position, but they can be touchy so feather the handle to keep it from lurching when it engages. That PTO handle controls a hydraulic valve that controls both the PTO brake and the PTO clutch. In one position the brake is engaged and the clutch is disengaged, and in the other position the reverse is true. When you go to engage the PTO, move it slowly, and stop at the halfway to 2/3 point for a second or so before moving it the rest of the way and that should be the smoothest engagement without so much lurching. To find the right spot to stop the handle for the smoothest engagement, engage it and disengage it a few times with no implement hooked up and see at what point it grabs, and try to stop for a second just before the handle gets to that spot where it engages.
 
DD3 is a 545 which was made from 1979-1983, and that serial number is a 1979 serial number. It had the same 201 c.i. engine as the 4600 and 4610, and the production of the 545 overlapped both. The 4600 was made from 1975-1981 and the 4610 was made from 1981-1990, so the 545 was made during the the last 3 years that the 4600 was made and continued on for the first 2 years that the 4610 was made, and the 4610 continued on for a lot longer.

The "C" serial numbers were sequential from 1965 all the way through 1987 when they switched to double letters at the beginning of the serial numbers with only 5 numerals after the letters and started the new style serial numbers at BA80100 part way through the year in 1987, and when they ran out of "BA" numbers they went to "BB" and then to "BC" and BD through 1995, and then they switched to numerals first followed by a single "B" at the end. So a 1989 serial number would start with either BB or BC depending on when in the year it was made.
 

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