Thanks so much, that makes sense. I think this part of the diagram is what was confusing me. I thought the hydraulic pump was turning the impeller in the torque converter, kind of like a hydraulic powered motor. But what you are saying is that the hydraulic pump just fills the torque converter with oil, and circulates cool oil through it. The engine driving one half of the torque converter impeller is what makes the output of the torque converter spin, not the hydraulic pump. I think what confused me is that on a crawler like this the hydraulic pump is physically separate from the torque converter. I guess in an automatic transmission car the torque converter is a sealed unit, and not fluid is pumped through it.
I assume this is because the cooling requirements for a crawler are a lot more demanding than for an automatic transmission in a car, so the fluid in the torque converter needs to be pumped through an oil cooler by the hydraulic pump.
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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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