Well - lets see. I will once again check the power lift charts for my LA1153 FEL. OK - it says:
1) at a distance of 500mm( ~20") off the ground
2) at a point 400mm( ~16" ) forward of the pivot pins - a point 4" forward of the very back of the grapple jaws when open half way
3) this FEL/grapple is rated to lift 1950 Kg ( ~ 4300 pounds)
Now - using my math skills - - 4300 pounds minus the grapple weight of 820 pounds equals approximately - - 3480 pounds.
I have absolutely no idea nor interest in what a
M6-141 will lift. The figures above come directly from my Kubota Front Loader Operators Manual for Model LA1153 - page 8 - - power lift chart.
Travis - check your published loader charts in the FEL Op Manual. You have one chart for when the FEL is set for max lift and another for when the FEL is set for max height. My FEL is set for max lift capacity.
Where most folks get confused - - Kubota posts lift ratings for their FELs at a point 800mm( ~ 32 ") forward of the pivot pins. That is way out at the very lip of a bucket - if that's what you have on your FEL.
The very back of the mouth of my grapple jaws is only 12" forward of the FEL pivot pins. Thats why I use a calculated figure of 16" forward of the pivot pins. Thats a point 4" forward of the very back of the jaws of the grapple.
All my noodling and calculations can't be that far off. I have several times lifted a fresh cut green Ponderosa pine log - ten feet long, ave 36" in diameter with a calculated weight of 3200 pounds. Granted, I only lift it so the grapple is about 6" off the ground - but at that weight - - thats more than sufficient.