This is an interesting concept but this hill side tester will always overestimate the stability since the tractor doesn't tip along an axis parallel to the PTO shaft. It actually tips along an axis running from the rear tire contact patch to the front axle oscillation point (wide front tractors) or the front tire contact patch (tricycle tractors). The plumb bob will cross this actual tipping line before it crosses to the outside edge of the rear tire when viewed from the rear since the center of gravity is always ahead of the rear tires. The farther forward the CG is the more discrepancy there will be between the tester and reality.
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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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