I have recently replaced the hydro pumps, and one parker wheel motor on my exmark. Installed everything,filled with oil, right hydro/wheel motor works great. Looked at the left side, and nothing, no movement or noises. Left side is new wheel motor. I pulled the lines off and was pressurized, so I know the hydro pump is working. But when I tried to turn wheel motor with a wrench it does not spin freely, its real glitchy, like something is rubbing on inside. Should it spin freely or have resistance when lines are disconnected?