The near 1,200 lb Capacity. @ 500 MM and 1.5 M height is in line with the tractors weight. A large 16,000 TLB lifts at least a third its weight. My
L39 at 1.5 meters lifts 3,000 lbs. at +8,000 lb. operating weight.
http://www.tractorbynet.com/forums/kubota-owning-operating/334239-l45-hyd-pressure.html
The weight of the Kubota L 3901 with an LA 525 loader without
ballast or loaded tires is quite light for its size. This makes it a good field work tractor and mowing machine, but not the best at ground engagement or dirt engagement.
The Max28 I just bought as a small Ag tractor lifts 1,400 lbs. at the pins to full height, but I suspect it can't lift much if any more at ground or mid height. It all has to do with geometry of the loader.
Actually it is safer to have the loader get weaker as the bucket height goes up, so that is probably Kubota's rational for the way they design the loader.
The Max28XL Shuttle & Loader weighs + 2450 lbs, un ballasted which is actually light for a Mahindra. Size wise the Mas 28 is quite a lot smaller than the
L3400 I was using for some field work. The
L3400/
L3901 etc with loader is 3,400 lbs. Even with a box blade and loader tires the
L3400 feels light. This is fine on an established property, but I find a heavier machine for the size suits my needs.