Re: Re: Re: So how safe are we?

Posted by lee on December 30, 2003 at 21:59:27 from (24.24.92.235):

In Reply to: Re: Re: So how safe are we? posted by Robert on December 30, 2003 at 20:10:10:

I would look at it more like this. Any time a tractor is in forward motion the effect of the torque applied to the drive axles is to try to lift the front end. This is the case with no load applied to the rear of the tractor. A strong tractor may lift the front end slightly by simply puching the throttle hard in a low gear. If you attach a load to the rear of the tractor, parallel to the ground and at the exact height of the rear axles the torque on the drive axles is still the only reaction tending to lift the front end. If you attach above the rear axles the effect is that the front will come up more readily. If you hook up below center of the rear axles the effect is to help hold the front down. But this won't ensure that you will not ratchet over backwards. If the rear tires hook up sufficiently and the tractor has enough power, the tractor is coming over, and rather quickly if she's quick to get on the governor. The deal with that gooseneck trailer is the heavy tongue weight applied to the draw bar. All that weight on the drawbar behind the rear axle centerline, tends to lift the front end. On a correct 3 point hook-up with bottom plows, the top link is in compression, which asssists in holding the front of the tractor down. The lower links are generally down low below the axles. That's one reason why the three point was such a great invention for pulling plows. Tractors are not really meant for pulling large stumps or other fixed items.

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