I have a zetor 5211 with a Leon front loader and all of a sudden it stopped lifting, never slowed down or had a hard time lifting or going down. oil is new and full, it has been sitting for about a month now(work would not permit me to get to it) just replaced the battery 3 days ago as well. ideas? also on my massey ferguson, rear hydraulics failed to lift my snow blade... worked up until 2 days ago, new oil and loader works fine as well.