Posted by RodInNS on October 02, 2008 at 14:09:02 from (216.118.158.123):
In Reply to: Re: Flipping Fordson posted by Jeff-oh on October 02, 2008 at 12:54:50:
That's a nice little pictograph and all... but it's incorrect, and so is the YT article you linked in your other post.
The heart of a draft control system, whether it be a ferguson type with top link sensing or a lower link/bending bar type is that as a sudden load is encountered (increased draft), the system will immediately cause the plow to lift. This will excerbate the problem by causing a large weight transfer to the rear wheels, giving a large increase in traction to keep moving. The other consequence of this lift is that the weight transfer will lift the front end, perhaps off the ground...
The only safety feature that I'm aware of in the ferguson system is a lift cylinder safety valve. This is nothing more that a poppet type relief and whenthe pressure behind it exceeds it's spring force, it opens. This is several hundred psi above the nominal system pressure. It does protect the lift system from shock loads, but if a plow hooks something in the ground, the shock is lateral rather than vertical. It may translate into some downward thrust on the arms, but not enough to pop the safety valve in most situations. Where the safety valve does open is when you're bouncing down the road and hit a bump... and the plow bounces and comes down hard. The safety valve will open to release that shock pressure and lower the plow. There is very little function difference in safety between a system operating in draft mode and a system operating in 'position' mode. IF anything, I'd give the advantage to position mode.
If you want to 'see' how a ferguson top link sensing system works, set the system for draft. Lower the arms half way and start the tractor. Now take a crow bar and apply pressure to the top link rocker in the same manner as a plow would compress the top link with increased draft. The arms will rise...
The main reason that tractors flip over is a combination of inadequate front weight or a high draft point/hitch point rather than pulling from the bottom of the axle housing.
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