... bulldozer, produced by CATERPILLAR technolog. SD7 / SD8 / SD9 BULLDOZER: with semi-rigid suspended, elevated sprocket, track-type bulldozer, hydraulic direct drive, hydraulic ... by CATERPILLAR technology, and equipped with Chongqing-Cummins diesel engine.Semi-U blade, angle blade, single-shank ripper, three-shank ripper ...