SD7 / SD8 / SD9 BULLDOZER: with semi-rigid suspended, elevated sprocket, track-type bulldozer, hydraulic direct drive, hydraulic controls. These models are produced by CATERPILLAR technology, and equipped with Chongqing-Cummins diesel engine.Semi-U blade, angle blade, single-shank ripper, three-shank ripper, air conditioner are optional accessories.SD7, 220HP, 28000kgs, straight-tilt blade, ROPS cabin;SD8, 330HP, 40000kgs, straight-tile blade, ROPS cabin;SD9, 430HP, 49000kgs, straight-tile blade, ROPS cabin.