What's the number on the loader? I believe the current Kubota loader numbers are the approximate lift capacity in kilograms. For instance, the LA402 is about 402 kg or 880 lbs.
Not sure how long they've been using that scheme or if it's applicable to all current models, but I believe it's a pretty good match for the B and L series, currently.
Of course, I could be wrong. /forums/images/graemlins/confused.gif
~Rick