TG-48 is the KKII and is the Yellow Gear Driven tiller.
As far as lifting capacity goes, remember, the tiller is not long, not like a Rotary Cutter where the weight is hanging way back behind the machine.
Most , if not all of the weight is within 16" of the pin. Leverage takes care of 550 lbs , easily.
I've got one of the 48" KKII's on the way for my
BX2350
I think it will do just fine, lifting and powering the unit. Dan239 has confirmed this, and I haven't yet heard anyone say the unit was too big or heavy for their tractor.
It looks like KK made the decision to offset the 48" unit so as to guarantee one full side would be covered, so, it may require going back to Point 'A' and resume tilling in the same direction , in order to maintain the overlap and leave no tracks. There may be cases, in a tight space, where it causes problems, but I can't think of a case where it's going to be a show-stopper?
The KKII Gear driven unit looks like a Tank compared to some of the chain drive units out there, which look more like sheet metal in comparison. That is not to say the chain drive units aren't fine machines , they probably do just fine, I only say this as it was one of the facotrs that affected my decision.
Sounds like we might have a 'Tiller Round-Up' here as soon as all the new Tillers arrive.
Congrats to everyone adding to their collection of toys, errr, I mean, "fully justified" equipment
