Just finished a pump replacement on my bx23. The fan had no blades on it for who knows how long, tractor is ten years old with 1100hrs on it. I did it from the front without taking the entire rear end out as kubota suggests. Note to others " the new pump came with out paperwork. So i did not notice the three little dust plugs inserted in the face of the mating surface. They were about 3/16 diameter and clear plastic. I thought they were some kind of mating washer.anyway the oil filter blew up and i had oil everywhere. But i did complete the job the second time in about 6 hrs. If anyone one needs info. On what needed to come off feel free to contact me. I also found a company that rebuilds these.