1. Crawler tractor
Because the crawler tractor is supported on the ground through the winding track, the track and the ground contact area is large, the pressure (pressure per unit area) is small, such as the earth pressure of Dongfang Hong-802 is 44.1 kpa (0.45 kg/cm2), so the tractor is not easy to slump. And because there are many thorns inserted into the soil on the track plate, it is easy to grasp the soil layer, and it is not easy to slip on the wet muddy or soft soil, so it has good traction adhesion performance, compared with other types of tractors of the same power, it can issue a larger pulling gravity, so the track tractor has good adaptability to different ground and soil conditions. And can do other types of tractors are difficult to open up land, deep digging and farmland capital construction and other heavy work. Its disadvantages are large and bulky, metal consumption, high price and maintenance, less supporting agricultural machinery, narrow scope of operation, easy to damage the road surface and not suitable for road transport. Therefore, the comprehensive utilization performance is low.
2, Two-wheel drive wheeled tractor
Its characteristics are basically the opposite of crawler tractors. It is smaller in size, lighter in weight, consumes less metal, and has lower price and maintenance costs. There are more supporting agricultural machinery, a wide range of operations, can be used for road transport, and the annual use time is also longer, so the comprehensive utilization performance is higher, and the main production and sales of two-wheel driven wheeled tractors in China are relatively large. Its disadvantage is that the ground pressure is strong, the tire pressure in the field is generally 83.3 ~ 137.2 kpa (0.85 ~ 1.4 kg/cm2), the hard road is generally 147 ~ 196 kpa (1.5 ~ 2.0 kg/cm2), easy to trap the car; It is easy to slip on wet muddy or soft soil, the traction adhesion performance is poor, and the traction force cannot be issued. Therefore, when a two-wheel driven wheeled tractor needs large traction or poor road and soil conditions (such as clearing, deep digging, farmland infrastructure, climbing road obstacles, etc.), its work quality is not as good as that of a tracked tractor.
3. Four-wheel drive tractor
Its characteristics are between the two-wheel drive wheel tractor and the crawler tractor, it is a model with the advantages of both. Because it is four-wheel drive, its traction performance is 20% to 50% higher than that of two-wheel driven wheeled tractors. It is suitable for hanging heavy or wide efficient farm tools, and is also suitable for farmland capital construction work. When working on medium temperature soil, the working quality of it is similar to that of crawler tractor, but it is quite different when working on high humidity sticky soil. Structurally, it is more complex and expensive than two-wheel drive wheeled tractors. However, it consumes less metal and has a lower price than crawler tractors.
4. Walking tractor
It is characterized by volume, light weight, simple structure, cheap price, flexibility and good performance. It is not only a good farming machine for small paddy fields, dry fields and hilly areas, but also suitable for many operations in orchards and gardens. In addition, the walking tractor can also be matched with a variety of agricultural and sideline product processing machinery, which can be used for fixed operations and short-distance transportation, and the annual use time is very long, and the comprehensive utilization performance is very high. Therefore, in the tractors produced and used in our country, the number of walking tractors is the most. Its disadvantages are small power, low productivity, poor economy, paddy field operation labor intensity.Wheel Tractor
