Last week I was mowing and the left wheel pump went out, so I ordered a new one and it looked slightly different from the one that was on the right side of the mower. The thing that was different was that it had a nut like the nut that you can turn to release the pressure in case you have to push it somewhere, other then that everything was the same. So I put it on and now the left wheel doesnt spin nearly as fast as the right side, I have adjusted all of the linkage and still nothing, it spins a little but I can either adjust the linkage so it will go fast forward but then it has no reverse and vise versa. Do you think that this could be a wheel pump problem? I took both of the lines off of the pump and stuck them in a bucket of oil and spun the wheel to see if it pumped oil and it did.