Mid mount mowers are designed to mow lawns. They are not designed to mow untended areas. What are you mowing?
Apparently, your gear drive B1750 is not a HST. Accordingly, drive is controlled by a foot clutch and gear shift levers, rather than a HST (foot) pedal. The 2/4WD lever and differential...
B has steering brakes, considerably more powerful engine options, available cab, very good, terrain-following MMM, and, of course, the big one, position control, the lack of which is an absolute showstopper for me.
Don't want to pull overhauling loads with three point hitch because hitch can raise while going downhill, potentially causing disconnect. Folks have been injured and killed doing so.
Draw bar stays can be used to prevent such, but it is safer to pull such things from the swinging drawbar.
Bingo. Needs to go.
Left stabilizer appears to be in place but do not see one on right side. Adding another to right side will help.
Yes, reversing hitch pins will help.
Agree with earlier poster about HD lynch pins but locking type are even better, if difficult to find.
Tractor mowers, even HD, rough-cut mowers, are not designed to mow rocks.
Regarding rotary cutter weight, read and adhere to the Kubota (not LP) weight and width restrictions in your tractors Operators Manual.
FWIW: I used a Woods BB720X cutter with my L6060 because I already had it when I...
I do not believe that Kubota offered a 60" deck for the 6100. Perhaps a 54", but again, not certain.
In any event, a 60" deck is too much for a 6100 in any but ideal conditions.
Of course, and it would have been more accurate if I had typed "cast steel," or simply "cast" rather than "cast iron," but most laymen do not distinguish between cast iron and cast steel, and this is a tractor forum rather than a metallurgy class, and most laymen do distinguish between cast...