I traded for an old Dodge with a Meyer plow on it. I had one years ago that worked well for me. This one had been sitting with one of the hydraulic line unhooked for about a year. I drained the oil out of it and checked the screens. One of the solenoid valves was broken so I replaced all three with new. The motor runs and the valves click hard but it will not raise or till the blade. What's next?