An extendable arm loader is a construction machinery used for earthmoving operations on roads, construction sites, railways, ports, mines, and other engineering projects. It is primarily used for loading loose materials such as soil, sand, lime, coal, and others. The loader with a grapple can also perform light excavation tasks on ore and hard soil. Due to its fast operation speed, good mobility, and ease of operation, it has become one of the main types of machinery for earthmoving in engineering projects. The hydraulic system of the extendable arm loader employs a priority steering method, where the pressure oil from the steering pump is mixed with the pressure oil from the work pump to supply oil to the working unit.