LA525 FEL is 845 pounds by itself. Bucket adds around 160 pounds additional.
You have to tease the FEL weight out of the Kubota Whole Goods catalog.
2,600 pounds for 2-WD, gear transmission
L3901.
Most who order an FEL would have 4-WD + HST. That bare tractor weight is 2,778 according to Kubota.
Tractors are spec'ed with R1 tires. Add 150 (+/-) pounds for R4 tires, which most would order with FEL.
Perhaps 50% of compact tractors depart the dealer with filled rear tires, which would be additional weight. Weight will vary by tire size, fill liquid and fill level.