The working device is the main component of the hydraulic excavator. At present, the SY series excavator is equipped with a backhoe working device, which is mainly used to excavate the soil below the parking surface, but it can also excavate the soil below the maximum cutting height. In addition to ditching and loading, it can also perform simple field leveling work. The excavation operation is suitable for excavating the soil of grade Ⅰ~Ⅳ, and the hydraulic hammer or blasting method is required for the above grade Ⅴ.

The backhoe working device is composed of boom, stick, bucket, rocker, connecting rod and hydraulic pipelines of the working device including boom cylinder, stick cylinder and bucket cylinder.