If the shaft was worn or had a seal cut from the old seal it's possible the new seal is riding in the same area causing the leak ? I double sealed mine ,as far as the leak at the other end I'm clueless at this point . I attached this link if it works and followed these instructions when I did mine ,so far so good but haven't run it much yet !
http://www.cubcadetman.com/cc/how-to...draulic-pumps/