This series product is a middle and small hp 4-wheel drive tractor directly connected with its engine specially used in mountain areas and muddy roads. It has the characteristics of high transmission efficiency, low tremble, high traction, high adaptability and easy start. Jaw type differential lock can improve the pass-ability. Hydraulic output interface can make direct connection with the dump trailer. This series tractor can have many different configurations according to customers demands: single stage clutch or two stage clutch, (3+1) ×2 six shifts or (4+1)×2 eight shifts where the creeping shift can be selected, one or two standard PTO rev., fixed or adjusted tread, back catalogue 0 or 1 suspensions, mechanical steering or hydraulic steering and so on.