For the Yanmar B27, VIO35, VIO55, and VIO75 excavators, the displacement of these pumps varies according to the specific model and its hydraulic system requirements. However, without specific detailed information from Yanmar, we can make general estimates. For example, for smaller models like the VIO35, the displacement might be in the range of 30 - 50 cubic centimeters per revolution (cm³/rev), while for larger models such as the VIO75, it could be in the range of 50 - 80 cm³/rev. The accurate displacement for each part number (172187 - 73300 and 172478 - 73101) should be confirmed through official Yanmar documentation.
Operating Pressure
Rated Pressure: The rated pressure of these pumps is typically around 250 - 320 bar (25 - 32 MPa). This pressure rating is designed to effectively power the hydraulic systems of the respective Yanmar excavators, enabling functions like boom lifting, arm extension, and bucket operation.
Maximum Pressure: The maximum pressure that the pumps can withstand for short periods is usually higher than the rated pressure, often reaching up to 380 bar (38 MPa) or more. This additional pressure capacity allows the pumps to handle sudden high-load situations that may occur during the operation of the excavators, such as when dealing with heavy digging tasks or operating in tough terrains.
