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A rock hound is a hydraulic attachment. It has little flails that grade the ground and pick up the rocks and kick them into a bin in the attachment. When the bin is full you drive over to whatever or wherever and without getting out of the bobcat, dump out the rocks. An expensive but very slick attachment. It will pick up rocks up to a certain size, chew or shred up mud and no raking will be necessary.
If you go to the official bobcat web site which is probably something like bobcat.com. You can click on attachments or photographs and see a photo of the eliminator or rock hound.
I believe the official name for a rock hound is what they call a landscape rake.
Check on the cost of a rock hound verses a harley rake. The rock hound certainly has a lot more moving parts to break down than a harley rake. Check on the width, just a couple of inches can make a lot of time difference.
I believe with the harley rake you can angle it and just keep on raking the rocks into a windrow, and come back with a bobcat bucket and scoop them up. So I would be inclined to say that there isn't a lot of difference in time between a harley rake and a rock hound.
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