As an important mechanical equipment in engineering construction, the stable operation of bulldozer is very important for the project progress. Regular maintenance is the key to maintaining the good performance of the bulldozer.

Maintenance of the bulldozer, the first thing to pay attention to the engine. The engine is the “heart” of the bulldozer, and regular replacement of the oil and oil filter can effectively remove impurities in the engine, reduce parts wear, and ensure the smooth operation of the engine. At the same time, check the air filter can not be ignored, clean air filter can make the engine get enough clean air, improve combustion efficiency, to avoid the power drop due to poor intake.

The chassis system of the bulldozer also needs careful care. The chassis is under huge pressure and friction, the track, support wheel, sprocket and other parts should be regularly checked, timely clean the attached soil and debris, and ensure that the lubrication of the parts is good. If the track is found to be loose or seriously worn, it should be adjusted or replaced in time to prevent derailment and other faults during operation.

The hydraulic system is also under maintenance. Check the oil level and oil quality of the hydraulic oil, if the oil level is too low, it needs to be supplemented in time, and the oil quality is changed to ensure that the working pressure of the hydraulic system is stable, so that the shovel and other actions of the bulldozer are flexible. In addition, the hydraulic pipeline leakage check to avoid hydraulic oil leakage affect equipment performance and even cause safety risks.

In short, regular and comprehensive maintenance of the bulldozer can not only extend its service life, but also ensure construction safety and efficiency, reduce maintenance costs, and lay a solid foundation for the smooth advancement of project construction.

In recent years, the development of Chinese agricultural machinery can be described as advancing by leaps and bounds. From the plain to the mountains, from the south to the north, the figure of agricultural machinery can be seen everywhere. The data show that the comprehensive mechanization rate of crop cultivation and harvest in the country has reached a relatively high level, and the mechanical tillage rate, mechanical sowing rate and mechanical yield rate have been significantly improved. In some large agricultural provinces, such as Heilongjiang, Henan and other places, the application of large agricultural machinery is extremely extensive, large-scale farms, large tractors, combine harvesters and other equipment efficient operation, greatly improve the efficiency of food production.

In the future, we should increase investment in agricultural machinery research and development, promote technological innovation, so that agricultural machinery can better adapt to the needs of different regions and different crops. At the same time, strengthen the training of farmers to improve their operational skills and application level of agricultural machinery.

Before work, check the appearance, check whether the outside of the machine is cracked, deformed or damaged, check whether the bolts and nuts of each connection part are loose. At the same time, check the level of fuel, oil, coolant and hydraulic oil to ensure that they are in the normal range. Also look at the blade of the bulldozer to ensure that it is securely connected and the cutting edge is not excessively worn.

During the work, pay attention to observe the instrument and indicator light, monitor the oil temperature, water temperature, oil pressure and other indicators through the instrument panel, observe the indicator light to find the fault signal in time. And pay attention to the working state of the machine, listen to the engine and transmission system whether there is abnormal noise, feel the operation of the machine is smooth.

After the end of the work, to clean up the bulldozer, brush and other tools to remove the fuselage of dirt, dust and other debris, focus on cleaning the radiator and the engine surface to avoid overheating. Also check the wear of easily worn parts, such as tracks, blades, etc., to find problems in time for replacement or repair.

Tractor hydraulic system is mainly used to lift and control agricultural machinery.

It is generally composed of a hydraulic tank, a hydraulic pump, a control valve, a hydraulic cylinder and a connecting pipeline. The hydraulic pump is responsible for pulling the hydraulic oil out of the tank and creating pressure. The control valve can adjust the flow direction and pressure of the hydraulic oil to control the action of the hydraulic cylinder. Hydraulic cylinder is the actuator, through the hydraulic oil to push the piston, to achieve the lifting of farm tools and other actions.

For example, when a mounted plow needs to be lifted, a hydraulic pump delivers hydraulic oil to a hydraulic cylinder, and a piston extends under the oil pressure to lift the plow. The hydraulic oil in the system also plays the role of lubrication and power transmission, and can buffer vibration to ensure the stable operation of the system.

The walking characteristics of wheeled tractor

（一）Features:

1.Good maneuverability, fast speed, flexible steering, suitable for all kinds of terrain and working environment.

2.The pressure on the road surface is relatively small, and it is not easy to damage the road surface.

3.Maintenance costs are low and tire changes are relatively easy.

（二）constituent part:

1. Front wheel: Mainly used for steering, usually small, with a certain steering Angle.
2. Rear wheels: provide traction, generally larger and wider, to increase the contact area with the ground and improve traction.
3. Frame: Connects the front and rear wheels and supports the weight of the entire tractor.
4. Suspension system: including springs, shock absorbers, etc., used to reduce vibration during driving and improve ride comfort.