I recently acquired a JD 870 tractor and have been trying to use a back blade to scrape the top layer of sod off of an area of my property. The problem is that no matter how low I set the hitch down, the blade floats, is that the way it is supposed to work? I thought it would push into the ground and allow me to set the depth.
Welcome to the forum! A 3PH doesn't have downforce so a back blade will only dig to the extent it's weight will cause it to. Sometimes you can add weight, but this is a case where a box blade (with adjustable scarifiers) will dig much better.
The only other option that you have besides trying to add weight to the blade, is to lengthen the top arm to make the blade angle into the ground more. Think of a wood chisel turned over from the way it is supposed to be. This will help some, but JD is correct. The best way is with a box blade with scarifiers.
and congrats on your new tractor!
- When using the back blade, sometimes several passes over the same site helps.
- You could try to angle it (set it to 30 or 45 degrees), then shorten the top link allowing the front edge of the blade to dig to help break the surface.
But, of course, as JDFan and DJ have said, a box blade would work best. I purchased a back blade having the same hopes and you and ended up buying a box blade off Craigslist a couple weeks later.