Using a charger to test a starter is not a real good test. It may not have enough amperage to power the starter. Even successfully spinning a starter with a battery tells little about its ability to crank an engine under load.
The best test is with it still on the engine and connected to the battery.
Typically, with that type starter, bad brushes will cause the starter to fall silent, no drive pull in, no spin, just nothing.
A hard solenoid pull in with no starter spin is the internal solenoid contacts that send power to the starter.
And there are other possible problems, there may very well be an internal problem with the motor it's self.
What you are describing sounds like possibly a bad battery connection, be it at the battery, or one of the cables, the ground. Testing under load, on the tractor, with a test light or volt meter, is the first step.
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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