The track roller of a bulldozer bears its own mass and operating load, and the attribute of the supporting wheel is an important standard to judge its quality. Bulldozer support wheel is a kind of “four-wheel belt,” “four-wheel belt” in the four wheel refers to the driving wheel, the guide wheel, the support wheel, the support wheel, the belt refers to the track. They are directly related to the working performance and walking performance of bulldozers, and their weight and manufacturing cost account for a quarter of the manufacturing cost of bulldozers.

When choosing an excavator track roller, it should be selected according to the actual situation, and the following suggestions are for reference only:

1. Engineering scale
   Large-scale earthwork projects and medium-sized open-pit mine projects should be based on the investment scale and supporting equipment and other factors, analysis and comparison and scientific calculation, to determine the purchase of the corresponding bulldozer support wheel specifications, models and quantities. General small and medium-sized projects, such as road maintenance, irrigation and water conservancy, only need to use ordinary bulldozer support wheel.
2. Project matching condition
   The purchase of bulldozer supporting wheel should consider the matching of its existing equipment, including the matching of the operating efficiency of excavator supporting wheel and the operating efficiency of existing equipment.
3. Funding available
   Before the purchase should have their own budget, you can choose the bulldozer support wheel according to the budget.

The excavator track roller is the core component of the bulldozers crawler chassis. Its performance directly affects the reliability and efficiency of the whole machine. Choosing a good bulldozer support wheel is very important for subsequent use. At the same time, some maintenance work needs to be done. The purpose of regular maintenance is to reduce the failure of the machine and prolong the service life of the machine; Reduce machine downtime; Improve work efficiency and reduce operating costs.

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If the excavator fails, we need to check the track roller is or not partially damaged. And find that the main fault is the main shaft, wheel body damage and oil leakage. Among them, the main shaft of the heavy track roller with serious damage appears to hold the shaft, resulting in the entire heavy support round unable to rotate.

There are two reasons for the heavy wheel oil leak:

1. When excavator is working, the track is immersed in water for a long time, resulting in corrosion of the floating seal ring and O-ring seal ring groove.
2. Winter construction in muddy water, resulting in floating seal ring icing failure.

The upward support of the track chain supports the wheel body of the excavator. And the two ends of the spindle bear the gravity of the excavation. The gravity of the excavator is transferred to the main shaft through the crawler frame. The outer cover and the inner cover, and then to the shaft sleeve and the wheel body.

When excavators operate on uneven ground, it is easy to cause the tracked plate to tilt, resulting in the chain track to tilt. When the excavator is turning, the axial channeling power will be generated between the main shaft and the wheel body. Due to the complex force of the track roller of the excavator, its structure are must be reasonable, and the main shaft, wheel body and shaft sleeve need to have relatively high strength, toughness, wear resistance and sealing performance.

Excavator track roller damage consequences need to be judged according to the damage. Different causes of damage may cause different consequences, but in order to ensure better use, we need to do daily inspection and maintenance work to reduce the probability of damage.

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