Hi my name is Daniel and I need some advise. I let my brother in law use my lawn mower about a month ago. He said it worked fine, but when I used it the next day or so the self propel conked out completely. The belt was loose so I was pretty sure that the belt just fell off. And then about a week later the wheels would not rotate backwards. I finally got around to fixing it a couple days ago. I put the belt back on and tried it out, it seemed to work fine but it fell off. I put the belt on again and it didn't fall off. But there seems to be a lot of idk resistance. It doesn't put very much power out at all. If I hold it back the wheels just stop, when they used to just spin out. Does that sound like a lube problem, a belt tension problem or warn out self propel? A guy that I used to work for has a mower that seems to have the same problem. The wheels still do not rotate backwards. I'd appreciate some input on the subject. Thanks