Re: What is a 3 point hitch?

Posted by Joe Evans on December 21, 2004 at 20:06:22 from (67.129.216.80):

In Reply to: What is a 3 point hitch? posted by Tim Doiron on December 21, 2004 at 17:31:28:

Mr. Harry Ferguson invented the 3-point hitch. I believe he first used it on David Brown tractors in the 1930's in deal he worked out with them overseas. Ferguson got Henry Ford to use it thus the famous Ford 9N was born in 1939.

Just to add: the draft sensing in the top link senses the compression force through the top link. A mounted plow, for instance, will attempt to rotate up out of the ground around the bottom link pin axis. This force is restrained by the top link. When the pulling got harder (in tough spots) more compression force was sent through the top link. Also when the pulling got harder, wheel spin likely increased.

Too much pulling force was alleviated by a sensing valve in the tractor at the connection point of the top link. The circuitry automatically lifted the plows up a pre-determined amount (operater draft control adjustment)initially causing the rear tires to get "sucked" down to the ground harder (more traction) then also lightening the pulling force as the plow was not as deep. When pulling force lightened, the plows reset to the original depth.

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