... 24v electric startingTorque converterPower separating, hydraulic-mechanic drive, single stage torque converter is used in SD8 elevale sprocket bulldozer. ... part. It is very convenient to service. Transmission is multi-stage planetary drive to realize modular assembling and disassembling. Gear the ... 2nd gear, 3rd gear forward or reverse rapidly, through multi-functional control valve. SD8 BULLDOZER