It's weird that the manual for my
BX25 mentions the FEL float position but doesn't explain it. I found a video on youtube that showed me how to put it in float. Then I tired it out, and it worked. To get it to float over uneven terrain, should I rollback the bucket just slightly or keep it level? When I tried it out it just dug into the ground.
The handiest thing about float is it can place your bucket on the ground.
You can't see much right in front of the bucket.
Is is 1/2" above ground, or flat on the ground, or is it lifting the tractor up slightly, so when I go forward it will dig into the ground?
If I go to float, it is ON THE GROUND. You can know this merely by going to float, whereas without float, you may either have to get off the tractor to look, or you may be quicker just cutting the tractor off, and then going down on the boom, and then restarting the tractor. So, if float accomplished only this, it would be well worth the money.
What if you want the bucket 1/2 " off the ground. You guessed it.. It is much easier to float to the ground, then guess at a 1/2" raise than it is to lower from some height to 1/2."
I hope this helps and does not sound like nonsense:
Float is useful going forward or backwards, but has different goals depending on direction. I must be hungry, because every problem has a food analogy.
Specifically to your question, if backdragging, you are spreading butter on toast or whitebread. Whitebread requires a flattish angle generally, but you can vary the angle to leave more or less butter on the bread. Flatter angle leaves more, sharper angle leaves less, and too sharp scrapes a hole in the bread. The same is true for toast, but you can use sharper angles without scraping a hole in the toast. Melted butter requires flatter angles, butter from the fridge requires sharper angles.
In backdragging, you CAN see the material under the bucket usually, so adjusting your angle to bring more or leave more is easy with practice.
Let's dig 2" into soft ground: Visualize this as a knife peeling an apple. You know the blade will follow it's cutting edge, so you rotate the knife around its cutting edge as you push through the apple. Minor angle changes determine if you go deeper into the apple, or cut out of the apple, abandoning the peel in place.
Go to float, and stay in float throughout this scenario. Once you start your cut, you will go forward continuously with a slow uniform speed, and you will not stop until your cut is done.
Turn the bucket at an angle where if we go forward, it will dig. Go forward slowly, watching the boom drop further, and try to guess two inches drop. Done right, you should be able to note your depth by looking just behind the blade. As you approach 2" depth, level the bucket out flat, all the while staying in float.
Now, as you go far enough forward that your front wheels drop into the 2" cutting you have started, your rear wheels are now 2" higher than the front wheels. Due to float, you will not necessarily start digging deeper than the 2" you desire. If not for float, you would be digging SIGNIFICANTLY deeper at that point.
Eventually, your rear tires drop into the cut. Again, no big deal, since the boom is moving independently of the tractor angle, so there is no need to compensate when the front wheels drop in, and no need to reverse the compensation when the rears drop in.
As you continue forward, you control the bucket depth by the angle of the bucket curl. If you need a bit deeper, curl downward while going forward slowly, and when the bucket reaches the new depth, curl to flat again.
To dig less deep, curl upward while going forward, and the bucket should cut to a shallower depth.
If you ever need to cut below grade, think of peeling an apple, use your float, and you should have better luck you would have experienced otherwise.
I didn't say you will get perfect results. Cutting below grade with a FEL is needed relatively rarely and takes practice. [Rarely needed and takes practice] <= see the potential for frustration?