First time posting but since I have had some bad experience with æ¾±ackdragging I thought I would add my 2 cents worth.
I have a 2007 Kubota Grand L-3540 HST with 600 hrs. on it, which I love. The FEL is a Kubota LA-724 (which the dealer said was the most heavy duty allowed, by Kubota, on this tractor). The bucket is the extra heavy duty with the additional bolt on cutting edge so it will not bend or distort at all (so far). I also have a 6 foot grapple for this unit which has done most of the hard work during the 600 hours of run time, clearing 10 acres.
I was backdragging with the grapple fully open and fully tilted forward (the hydraulic cylinder fully extended) dragging the top grapple hooks to tear up the ground in a hard spot. As I had some downward force on the FEL and backed swiftly I heard a loud metallic clang. I found the hydraulic cylinder shaft had bowed to the point of breaking and snapped in two about 3 inches from the end of the cylinder.
The dealer said everyone knew not to back up with it fully extended (I didn稚) and it was in the manual saying not too. I bought the �ost heavy duty FEL allowed on this tractor and expected it to take what I was doing. The dealer covered it under warranty but said he would not cover it again. A new cylinder was installed to cover it about 2 years ago and I recently noticed this 渡ew cylinder has a slight bow to the shaft (no idea when this happened). I have been pretty careful with it since replacement but I have backdragged with the bucket some. I still say the cylinder should handle this but it does not on my unit