John Deere 4030 with Quad Range (16 Speed) transmission plus the hydraulic system and dual speed PTO would have a clear advantage over the 686 in terms of features. Given the age of both condition might be the ultimate factor in which one to go with. I have a friend who would be highly interested in the 686 if you were to pass it up. Anyways, either if well maintained would make a good tractor. Further, the 4030 may have differential lock which was never offered on the 686. The HP difference is significant with the 4030 rated at 80 PTO HP and the 686 at 66 PTO HP. The 4030 catches some guff because it is less HP than the 4020 even though the model number is higher.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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