Wheel excavators with unique walking mechanisms offer enhanced mobility and efficiency in various construction applications.The special tire type chassis walking device is roughly divided into several categories：No Outrigger Legs, Dual Outrigger Arms and Four Legs. Additionally, the advantages and disadvantages of the four-legged wheel excavators are examined to gain a comprehensive understanding of these specialized walking systems.

No Outrigger Legs: Characteristics: Adopts a tire-based chassis and without any outrigger legs. Offers increased mobility and maneuverability in compact spaces. Enables quick setup and efficient operation. This kind of wheel excavators generally used in projects with limited space or where frequent movement is required. 

Dual Outrigger Arms: Characteristics: Incorporates two outrigger arms on each side of the wheel excavator. Provides additional stability and load-bearing capacity. Offers improved performance on uneven or sloping surfaces. Enhances safety during heavy lifting operations.

Four Legs: Characteristics: Features a four-legged design with individual hydraulic legs at each corner of the wheeled excavator. Offers superior stability, especially when dealing with heavy loads. Enables increased reach and digging depth. Enhances safety during lifting and operation on challenging terrains. 

Advantages of Four Legs: Exceptional stability, especially on uneven or soft terrains. Increases load-bearing capacity for heavy-duty applications. Improves reach and digging depth. Enhances safety during lifting and operation. Disadvantages of Four Legs: Higher complexity and cost compared to other configurations. Requires additional setup time due to the leg extension and retraction. Limits maneuverability in tight spaces.

Conclusion: Wheel excavators equipped with special walking mechanisms provide distinct advantages based on their specific configurations. While the no outrigger legs and dual outrigger arms offer enhanced mobility and stability, the four-legged configuration stands out for its exceptional stability, load-bearing capacity, and increased reach. However, it is vital to consider the associated disadvantages, such as higher complexity and reduced maneuverability. Evaluating these characteristics can help facilitate informed decisions when selecting the most suitable wheeled excavator for construction projects.