Chapter 4 Running System Section 1 Introduction 3.2 Characteristics and Composition of Tractors'Running Systems Generally,wheeled tractors'running systems are composed by the frame,front axle and wheels Tractors are mainly used in fields,so their running systems have the following characteristics compared to automobiles: (1)Generally using larger diameter balloon tyres,and having raised patterns. (2)Guide wheel is small in diameter,and with one or several ring patterns. 业机械电子工程学聚 Automobile and Tractor Northwest A&F UniversityAutomobile and Tractor Northwest A&F University Chapter 4 Running System 3.2 Characteristics and Composition of Tractors’ Running Systems Generally, wheeled tractors’ running systems are composed by the frame, front axle and wheels. Tractors are mainly used in fields, so their running systems have the following characteristics compared to automobiles: (1) Generally using larger diameter balloon tyres, and having raised patterns. (2)Guide wheel is small in diameter, and with one or several ring patterns. Section 1 Introduction