The J-1170AS mobile jaw crusher has a 44x28-inch crusher with on-board detachable sizing screen. It is powered by a 350-horsepower Tier 4-Interim Scania DC9 70A diesel. The jaw chamber has a hydrostatic transmission that reverses in the event of a blockage, and has variable chamber speed. A heavy-duty, variable-speed vibrating grizzly feeder has an integrated prescreen to separate fines. The 12.55-cubic-yard hopper has hydraulically folding sides and a hydraulic self-locking mechanism.