With 4x4 FEL loader could one fill front bucket with dirt and pull disc with out rear tire weights or liquid in tires ??
My
L3560 has 35-horsepower. I have air in the tires yet pull the 900 pound disc fine in Florida sandy-loam, toggling between HST MED/High and HST MED/Low on the Grand L 'HST
+' half step transmission, generally at 75% to 100% throttle.
The
L4701 has 47-horsepower and is lighter. From experience I guesstimate supplemental weight on the rear tires will aid traction to apply the additional horsepower to the ground. You have to pull a Disc Harrow at a brisk clip for it to even the land properly.
While an FEL does add weight and dirt in the bucket adds more, the combination weight in front of the tractor leverages weight off the rear tires, negating some ( all
? ) of the FEL weight bearing on rear tires. Most with an SSQA bucket probably drop it for improved forward visibility when harrowing. I do. I once removed the entire FEL when preparing to harrow for several hours.
One can reduce the disc gang angles to reduce draft force resistance. One can raise the disc. One can lengthen the Top Link to shift more disc weight to the rear, smoothing gangs. But above draft force reduction adjustments reduce pan penetration of the soil.
Soils vary a lot. Soil moisture varies a lot. Tractor tire types and tread wear varies. Perhaps half of disc harrow users set their new disc aggressively, then never adjust the gang angles again. Too many variations to really answer your question with certainty.
Did you open the LINK in Post #20 and read the attached Post #7?
Bare tractors are designed with a standard weight distribution of 40% front, 60% rear.
Add a Front End Loader and the weight distribution becomes 50% front, 50% rear. (+/-)
Fill the bucket and the weight moves forward, leveraged by low-forward position of a laden bucket.
Could be 60% front, 40% rear. (Tractor wheelbase affects weight distribution.)
Traction is reduced because weight has transferred away from the big rear wheels.
(Hence the need for rear axle ballast.)
Rear wheels may or may not lift from the ground at this moment, but they will certainly be "light" if bucket payload is wet.
Green tree trunk sections and laden pallets on pallet forks are often heavier than wet bucket loads. Laden pallets protrude forward. Weight distribution could be 70% front, 30% rear. Rear wheels will lift.