Should read, You ALSO have brakes up front when 4wd is engaged.I can’t imagine it won’t, as long as the surface has reasonably good traction. Slick muddy conditions have halted my bx1870 from going up. But I’m dry conditions it’ll climb some very steep hills on my property.
Note that 4wd is optional going up, but can be crucial going down, especially if the front end loader is mounted. You only have brakes up front when 4wd is engaged.