The torque converter moves power from the engine to the input of the transmission. While doing this it can allow several things to happen, the engine can continue to turn while the machine is stopped and in gear. It also can transfer power while allowing the engine and transmission input to operate at different speeds, it can increase torque while doing this by letting the engine rpm raise into a higher torque band. It also acts as a cushion during gear changes. I am sure there are other attributes I am missing but those are the main things. The attached video of how a torque converter works explains its internal workings much better then I can. To simplify it even more say your dad has a 5 gallon bucket half full of water, he is the engine connected to the impeller as described in the video. You have a empty 5 gallon bucket, you are the turbine and you connect to the transmission input as described. Your dad is going to throw the water out of his bucket as if he was going to put out a fire. You are going to catch the water in your bucket. As the water hits the inside of the bucket the force you feel of the bucket trying to go behind you is the essential method of transmission of power through the torque converter. We have to disregard the fact that gravity is adding forces in my example. Also I will mention now the explanation of a lockup clutch does not apply in your application. Yes an auto trans in a car also has a hydraulic pump or fluid pump if that makes it less confusing. In the car trans it has the same purpose as in your dozer trans. The pump is needed to fill the converter with fluid. It also circulates fluid through the converter for cooling. It also circulates fluid for lubrication. It also provides pressurized fluid to operate hydraulically applied clutches as directed by the shift control valves. In the second linked video of ..how a power-shift works.. the explanation of the trans starts at 3:50 and right at 5 min there is an animation of a clutch pack application. One thing that can happen to a torque converter that may be a cause of your problem is the following. Once the torque converter has run it is filled with oil. Somewhere in the system there is generally a one-way check valve that will not allow the fluid to drain out when the machine is shut off. So that when you restart and put it in gear there is no delay while the converter is refilling. Maybe someone will chime in if this is a common problem for this machine. Have you changed filters or fluid on it? If you want to do any diagnosis on your machine I strongly suggest you get a service manual for it. This site sells hard copies. A more economical way would be a PDF version, look at a site called Farm Manuals Fast. Just a word of caution, if you find a site offering free download of a manual be very leery, virus dumpers like to pose as such sites.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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