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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