I recently put a new hydraulic pump on SMTA that I purchased from this site. It has a plug in the top, rear with a light spring and steel ball under it. Tractor started fine but if I shut it off and restarted it the engine turned hard, as if there was pressure on the pump. If I let it sit a while it was ok. I checked hydraulic valves but they were in neutral position. Finally backed out plug in pump and that seemed to solve problem. The spring under the plug is so light I couldn't believe it was keeping that much pressure in pump. Has anyone else run into this with new pumps? There was no paperwork with pump mentioning the plug.