... transmission,small size 3.stepless speed change walk behind road roller Introduction of walk behind road roller (model DT711-HTYL780) It ... use it supporting to large roller . Features of walk behind road roller 1.adopt diesel engine,the machine is ... so that the drive is comfortable.Technical parameter of walk behind road roller ModelDT7112-HTYL780power4KW(CF-178F)vibration frequency75HZdrive ...