Oh grasshopper, you have failed to glean all knowledge provided. You missed my sentence talking about the ..fluid pump.. that said .. In the car trans it has the same purpose as in your dozer trans.. So in all cases save a minimal few a fluid drive torque converter has fluid circulating through it for cooling. In the attached photo it is showing the part of a GM Turbo Hydromatic 3 speed automatic transmission which was a very common transmission used from the late 60s through the mid 80s. The part shown is where the torque converter mounts. The hole shown in the shaft is how the oil is pumped into the converter. Yes, the cooling required for an automobile torque converter is way less then needed for your dozer but still needed. The auto trans in these newer diesel pickups you see towing fairly large loads on 3 axle trailers are basically the same configuration as a rear wheel drive car. I think you would agree that there is some heat generation going on there. For the oldsters on here the one example of a fluid torque converter that did not have fluid circulation was from back when the traveling carnivals came to town. Specifically remember the tilt-o-whirl ride being powered by an Allis 4 cylinder power unit. In the drive train was a sealed torque converter. Also, Hunter the ..grasshopper.. opening to this reply was a line from the Kung Fu TV series from the early 70s. Yes, my age is starting to show.
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