Tracks!!!!Biggest problem on them.Tracks themselves,rollers etc.They get a lot of wear n tear,more so if used on hard ground.Best way to turn around is to counter rotate the tracks,turns on a sixpence but puts a bit of strain on the tracks.Seen a few of ours snap.
Our firm have 3 Yanmar 12 tonners,spent quite a bit of time on them a few years ago,& most problems were track related.
And it is very possible to get them stuck
![Rolling Eyes :roll:](./images/smilies/icon_rolleyes.gif)
.Ours were all one speed,but we often felt that a 2 speed would be better in sticky ground.