Model SWT900 series tractor is in top position among the same industry in China and its matched power is 4 cylinder diesel engine which power is 90hp. This tractor adopts fully hydraulic steering and hydraulic braking system. Its hydraulic suspension adopts catalogue II, tri-point, synthetic draft and position control. Joggling sleeve is equipped for its gearing shifting. Independently operated two stage clutch, reasonable shift gears (12 forward shifts and 12 reverse shifts), two rev. 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. Model SWT-904 as four wheel drive tractor is designed by installing a front drive axle on Model SWT-900. Its traction is improved on a large scale and is more suitable to mountain areas and muddy roads.