I just bought a bx1750 last month and am trying to work all the bugs out of it. I found a manual and just changed all of the hydraulic fluid, new filter, and replaced the strainer. The strainer was very dirty. It looked like it was plugged up. The transmission seems to work better now, but the up/down lever for the 3 point hitch does not work now. The lever moves freely, but the hydraulics do not move. I have never used the three point as I have no attachments until now. I bought a box blade and would to get it going. The fluid is new and reads correctly on the dipstick. The front loader works great. Any ideas? Thanks for the help, Sam