In our studies we defined a complete loss of stability as when one rear tire became unloaded - at this point the tractor is balanced about its "tipping axis". The width of the front axle never comes into play. The key is the height at which the tractor pivots at the front end. With a narrow front this point is at ground level while on a wide front it is elevated by up to several feet. This raised tipping point means that the WFE tractor has to lean over farther for the center of gravity to cross over the tipping axis. A similar situation occurs when turning a corner at higher speeds. The centrifugal force acting horizontally at the center of gravity is closer to the tipping axis which means it is applying less moment to unload the inside tire. The WFE vs NFE stability differences are more pronounced the farther forward and upward the center of gravity is located, such as with a loader. As you say, the best defense is to lower the tractor's CG and also have the rear tread width set as wide as possible.
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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