... C6121ZLG10 (Licensed CAT 3306 diesel engine)Type water cooled, single line, vertical, four strokes, turbocharged, 6-cylinders, diameter 140mm or ... It is very convenient to service. Transmission is multi-stage planetary gear drive to realize modular assembling and disassembling. ... .Hydraulic system of the machineIt is composed of oil pump, transmission control valve, steering and braking control valve, ...