A '''shear grab''' or also known as a ''silo grab'' or ''block cutter'', is an implement used to cut blocks of silage from a silage pit/clamp. It is connected to a tractor via the three-point linkage<ref name="mammut">[http://www.mammut.at/English/shearGra.htm shear grab mammut.at] {{webarchive|url=https://web.archive.org/web/20111115163000/http://www.mammut.at/English/shearGra.htm |date=2011-11-15 }}</ref> or some are connected to a front end loader.<ref name="cih">[http://www.cih.com.au/products/sa_sheargrab.cfm shear grab cih.com.au]</ref> It is powered by the tractors hydraulic system.
thumb|a block cutter
It usually has spikes on the bottom and a large rectangular section with blades on it that cut the block using two hydraulic rams.<ref name="mammut" /><ref name="cih" /> Before the invention of shear grabs farmers had to use silage knives, and a link box to get the silage into the livestock.
==See also==
* List of agricultural machinery
==References== <references> </references>
Category:Agricultural machinery