I'm looking into buying a used Husqvarna PF21 riding mower. I beleive it was made in 1994. The unit has all wheel drive, Hydrostatic operation, acticulating steering system. There is a problem with the hydrostatic drive. I'm not sure specifically what. Are there two transaxles in these units? Are they serviceable? Since it has all wheel drive, is there a standard transaxle with differential or is it a completely differnt beast? Does anybody have any experience with these units? The tractor is about a three hour drive away. I would hate to drive there and back for six hours for a tractor that I should be runing away from. Thanks,

Mark