Danfoss Oil pump RSA125 070-3410

The Danfoss RSA125 oil pump (SKU 070-3410) is a gear pump designed for small and medium-sized household burners with a fuel consumption of up to 255 l/h. It operates with diesel fuel and kerosene, supporting both 1 and 2 pipe operation modes. The pump features a built-in pressure regulator with a shut-off function and an annular filter. It can be used as a transport or feed pump, with a factory-set pressure of 7 bar and a pressure range of 5500–21000 mbar. The pump has a viscosity range of 1.3–75.0 cSt in the suction line, a filter area cross-section of 75/150 cm2/microns, and a shaft rotation speed of 1400–3450 min.

When selecting a replacement oil pump of this type, ensure the shaft rotation speed, pressure range, and fuel type match the burner's specifications. Verify the pump's mounting dimensions and shaft type (e.g., EN225) against the original. Check the system's operation mode (1 or 2 pipe) and confirm the pump supports it. Also, compare the factory-set pressure and adjust if necessary to match the burner's requirements.

Common failures of this pump type include loss of pressure due to worn gears or a clogged filter, leading to burner ignition issues or unstable flame. Leaks may occur at the shaft seal, causing fuel drips. If the pump fails to start or makes excessive noise, check for contamination in the fuel or air in the suction line. Inspect the built-in filter and replace it if blocked.