We just got a Liebherr 731c that had the blade chained up. We bought it from a lady who’s husband had passed and with him the knowledge of it went as well. Originally it wouldn’t move but it turns out it just leaked out a ton of hydro fluid from sitting for so long. It seems to move and run just fine but the blade has zero function at all. Any ideas where to start? Also does anyone have a good manual source for these machines?