AY series products are middle hp four wheel drive tractors with advanced performances at present. It has the characteristics of powerful engine, high transmission efficiency, big traction, low fuel consumption, high adaptability, compact structure and easy operation and maintenance. Joggling sleeve is equipped for its gearing shifting. 4?2+1) gear shifts, good reliability, reasonable speed distribution, two stage clutch, two rev. PTO according with international standard, hydraulic output interface and adjustable tread, hydraulic steering. These series are portable and flexible.