Last night I replaced the seals in one of my hydro gear pumps. It's the BDP-10A model. After putting it all back together, the pump is still quite noisy. With the wheel off the ground and the engine running, it spins but only in reverse. I can't get it to go forward at all when moving the lever forward. It's only noticeably noisy when the relief valve is closed all the way. Any help with what to do would be greatly appreciated!