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New here! hello everyone! In a bit of a pickle here. My father owns a 1993 (I think that is the right year) 520H Wheel Horse. I don't commonly work on tractors but it seemed simple enough. the axle snapped on the left side, so it needed a new transmission. My dad bought a used transmission and I went to work changing everything out. The hydraulic pump that the engine's drive belt attaches to went to a different model/year of tractor, so I had to remove that part and swap it in from the old transmission. In the process I lost all of the oil in the pump (I mention this because I wonder if it has to do with my problem I'm having). When I reassembled everything I started the slow process of filling the transmission. I filled it up and started the engine. When moving the lever forward or backward, it had a tiny bit of power for a little bit and then lost power. The transmission wasn't doing anything, anymore. I though maybe that hydraulic pump needed to be primed, so we took the top hydraulic line off of the hydraulic pump right above the drive belt and used a transfer pump to pump some oil into the pump case. This still didn't work. I don't have enough experience with these hydrostatic transmissions to know if we got a bad transmission or if there is something obvious that I am missing when it comes to a transmission swap. I ask for any insight and help please. If you need pictures or any other info, then let me know what you need. Thank you!
Last week I tightened the 2 screws that hold pressure on the plastic piece that holds the trans in a constant speed. I also had the belt guard off. I thought that I had the belt riding below the guide instead of on top of the guide once the guard was re-installed, as the belt was rubbing & smoking. The tractor would barely pull itself on level ground and I was about 1/2 mile from home. My wife pulled me home with the B-80. I had the engine running wide open and motion control full forward. The pull strap actually had some slack in it most of the time, so I don't think pulling the 875 caused a problem...I could be wrong... I bought a new belt, installed it and it still barely pulls it-self. Everything seems to be tight and working like it should. Any help in trouble-shooting this issue is greatly appreciated!