Believe the 730 holds around 30 tons 740 and 745 hold around 40-45 tons, which I’m not totally sure about exact numbers fully loaded, but roughly equates to 25 + cu. yards from the 725’s going on up to 30 + cu. yards on the 740 & 745’s, the 745 weighs 83K pounds, then loaded with 40 tons, think the specs say max weight is 163 thousand pounds, I’m not an expert but I’m guessing the 25,30,45 in the 7 series probably equates to the cu.m ( which I think you mean cubic meters)