Borrowed dozer. Ran for 3 hours, got stuck in stump hole. machine sat 3 days with front elevated 5 ft higher than rear in thick mud. Started vehicle, pulled out with blade and the tracks would not attempt to move. Trans. Pressure light and stop light were illuminated. Topped off trans fluid, which was VERY low...nothing. trans. Filter was seized up, beat with a chisel couldn't get filter off with tools that I had, fired the dozer up and tracks engaged when at full throttle.(possibly from tapping filter)... changed filter, ran for 30 minutes and trans. Pressure light came on when going up hill. Parked dozer, checked fluid levels, all good. Cleaned suction screen. Ran for 10 minutes, trans pressure light would come on unless throttle was wide open. Parked on somewhat of an incline. Started next day, trans. Pressure light on, tracks wont engage... pulled suction screen and there was no fluid in attached hose.
sounds like charge pump has failed
They don't like sucking air. That filter deal.... there was a Deere service bulletin, after several filter housings were broken when the first service was attempted, the dealers were instructed to take every new machine from the factory, remove the filter housing from the machine, clamp tightly in a large vice, remove the original fitler and reinstall a new one. Apparently the vendor supplied the housing to Deere with the filter installed by an automatic machine... can you say over-torqued?