Suntec Oil pump AUV47L 9857-6 AUV47L9857

The Suntec Oil pump AUV47L 9857-6 is a gear pump designed for use with diesel fuel and kerosene in single-pipe or two-pipe systems. It features an integrated solenoid valve with shut-off function and two possible nozzle outlets. The pump has a factory pressure setting of 9 bar, a maximum pressure of 25 bar, and operates at speeds up to 3600 rpm. It includes a built-in screen filter with a mesh size of 150 µm and weighs 1100 g. The pump is certified by TUV and has an identification number stamped on the pump cover.

When selecting a replacement oil pump of this type, ensure the mounting configuration matches the burner's hub according to EN 225, and the shaft diameter is compatible. The connection threads must be cylindrical per ISO 228/1, and the pump should be chosen based on the required flow rate and pressure range. For installation, verify the bypass plug is correctly positioned for the system type: installed for two-pipe systems and removed for single-pipe systems. The electrical connection must match the voltage and frequency of the burner, and the pump should be wired using the Suntec connection cable to achieve the specified protection class.

Common failures in oil pumps of this kind include loss of pressure or erratic pressure regulation, often caused by a clogged filter or worn gears. If the pump fails to deliver fuel, check the solenoid valve for proper operation and the bypass plug for correct configuration. Leaks may occur at the shaft seal or connections, leading to fuel odor or visible drips. Additionally, excessive noise or vibration can indicate cavitation due to high suction lift or air ingress in the fuel lines.