When I had a similar problem with my old 2000, I just added some extra hydraulic fluid. There is an intake filter that is tough to change and will prevent lifting when clogged. The extra fluid (only takes about a gallon or so above the level check plug), bypasses the filter and may allow the hydraulics to lift normally. This is a short term solution that can get you by until winter when there is time to do proper maintenanence and replace the filter. If it still wont lift with an extra gallon of fluid added, then you are looking at a more serious problem.