I just rebuilt the gear box on the mower deck of my F2680E Kubota. When I bought it the deck had been run with the center blade bearing down so seals and bearings all the way up the shaft were spent. So when I disassembled it I also found the beveled gear set showed uneven wear like it had been run out of alinement, So I also replaced the $ 500.00 beveled gear set. Got it all put together and rotated the input shaft of the gear box it felt a little stiff to turn but smooth. Got everything assembled and added gear oil 85-90 sae. After mowing about 15 min. I check the gear box it felt very warm no smoke but very warm. My question is this normal ? I also over filled a little and I noticed that a little oil was coming out the vent screw. The deck on this mower is model RCK72P-F36. Any advice would be greatly appreciated.