SD7/ SD8/ SD9 BULLDOZER: with semi-rigid suspended, elevated sprocket, track-type bulldozer, produced by CATERPILLAR technolog. SD7 / SD8 ... / SD9 BULLDOZER: with semi-rigid suspended, elevated sprocket, track-type bulldozer, hydraulic direct drive, hydraulic controls. These ... 430HP, 49000kgs, straight-tile blade, ROPS cabin. SD7 / SD8 / SD9 ELEVATED SPROCKET BULLDZOER