We purchased a hay buster this winter. This is a machine that grinds up hay and feeds it onto the ground, or into a bunk, for livestock. The benefit of grinding hay is livestock can better consume and digest hay if it's already been ground into smaller pieces. We are utilizing this machine to make some of the poorer quality hay we have on hand more palatable to our calves. If we didn't grind it,they would pick through it and consume less of the total volume of hay we fed them due to its coarseness. It still has nutritional value, but in its whole form it's not as appealing to the calves.
Second, you have to turn on the lever that slides in the photo of the controls, and let it get up to speed. I apologize for those of you that know all the accurate terminology. I am not that mechanical, I just know how to run the stuff.
Third, you let out the clutch and start moving, while pushing the red handled lever forward, which turns on the actual grinder.
The result is that the hay bale starts spinning as the grinder chews it up and spits it out on the ground. You can manually adjust how coarse or fine it will chop the hay, and how wide of a pile it spits out on the machine. The size and width of the pile on the ground is also impacted by how fast or slow you drive.