Re: Re: So how safe are we?

Posted by Robert on December 30, 2003 at 20:10:10 from (208.23.178.138):

In Reply to: Re: So how safe are we? posted by RandyN in MO on December 30, 2003 at 19:00:56:

Actually, Randy, while this concept seems very simple, it is even simpler than that.

While the phrase 'Center of Gravity' is probably well understood, it is not the correct phrase here. The center of gravity of the tractor is not an issue.

If you imagine a tractor with a variable hitch height, imagine a tractor with a hitch height (pick a number, say 20 feet) that high in the air.

Wouldn`t take much pull toward the rear to lift the front of the tractor off the ground.

Start lowering the hitch height, and the result is that more pull would be needed to lift the front end. The effect continues until the hitch point reaches the ground.

Lowering the hitch height below the rear axle, there is nothing magical that happens.

Lowering the hitch height to ground level is the ultimate loss of lifting effect. Raising the hitch height anything above ground level causes a decrease in weight on the front wheels as pulling force is applied.

If you could actually lower the hitch point below the surface of the ground, pulling force would actually put more weight on the front wheels, transferring weight from the rear wheels.

It's just that lowering the hitch height as much as possible will usually cause the tractor to lose traction before enough weight is taken off the front wheels to cause them to lift off the ground.

I had a gooseneck grain trailer that one time I had 300 bushell of corn on and attempted to pull it (Slightly) uphill in soft ground behind a Deere 4230. The hitch was a little higher than when the trailer was hitched to the fifth wheel in the pickup. I had ten suitcase weights on the front of the 4230 and could not pull the trailer. All the pull and weight of the trailer on the hitch was above the level of the 3 point arms in the raised position.

Any pulling force I applied would lift the front of the tractor before the trailer moved.

Factory made hitch for the trailer and very dangerous. Good only for moving the trailer when empty.

Follow Ups:

• Re: Re: Re: So how safe are we? Paul in Mich 07:16:05 12/31/03 (1)
  • Re: Re: Re: Re: So how safe are we? Dave H (MI) 07:35:42 12/31/03 (0)
• Re: Re: Re: So how safe are we? lee 21:59:27 12/30/03 (0)

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