I have a Snapper s50x zero turn mower that was leaking hydro fluid out of the passenger side (left setting on seat) transmission. The transmission is a Hyrogear 2800 , i replaced the O ring which appears to have stopped the leak but after filling with hydro oil the transmission does not work. Had no problems before just the leak. I have had it apart a couple times but it is still not working. What did i do wrong???