Ken wrote on Saturday, September 30, 2017 (PDT): What the VIN? Go to the left column and look under research and info. Find serial numbers, click Allis then D17. It will tell you the year. Craig wrote on Saturday, September 30, 2017 (PDT): Couple of quick, easy ways to tell the difference in a Series III and IV, Series III has the hydraulic lever above the steering wheel, Series IV has hydraulic levers on your right side next to the seat. A series IV has the live hydraulic pump on the right side of the tractor in the belt pulley location. Hubert Bergen wrote on Tuesday, December 26, 2017 (PST): Series 4 will have the hydraulic pump where the belt pulley went on the older tractors. Hubert Bergen wrote on Monday, October 15, 2018 (PDT): Series 4 has the hydraulic pump where the belt pulley went on the older models. Hubert Bergen wrote on Thursday, December 27, 2018 (PST): series 4 has hydraulic pump where belt pulley went.

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