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Trouble with B112

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I'm having some trouble with my B112 I can't figure out. Basically what is happening is after it is warm when I go into a gear the outside rear pulley stops spinning. I little rocking back and forth and movement of the variable lever and it will take off. When it does this the belt is not moving either which means the tractor is not moving.

So here is some background. Drive belt only 2 years old with little use. BGB rebuilt about same time. I've been working on knocking down 20 ton of dirt I had hauled in and spreading with my front blade using 1st gear. Nothing is popping in the rear end or diff. When the tractor decides to move it goes normally but struggles to climb my hill which I didn't have trouble with before this issue. In any gear.

Does any one have something for me to check or ideas of possible problems. Thanks in advance for the help.

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