I bought a skid steer which had a leak coming from by the brake boot, thinking it was an easy fix. I pulled it down, bought all the seals for the pump, brake, axle housing. Filled the hydraulic reservoir with oil, put oil back into the chain case, started and tested the machine, operated it for about 1 minute then machine started to act like it needed oil, check the tank it was empty, noticed that oil is coming from between the shaft for the chain axle and going in the chain case. Is this suppose to take place, is that hole in the shaft used as a drain? I read in the manual that the chain case oil doesnt hav anything to do with the system oil, so not sure what is taking place. Please help !!!