Model SWT 854/884/904 series tractor is in top position among the same industry in China and its matched power is R series engine with England Richardo tectonics, covering 85/88/90hp. Joggling sleeve is equipped for its gearing shifting. Independently operated two stage clutch, reasonable shift gears(8 forward shifts and 2 reverse shifts) , two reverse. PTO according with international standard, its whole suspended, independent and combined airproof cab and adjustable tread are equipped with it. It is not only suitable for various field work, transportation and fixed tasks, but also for muddy fieldwork and engineering tasks.