Suntec Oil pump AN77A7256

The Suntec AN77A7256 is an internal gear oil pump with an integrated pressure regulating and cut-off valve, designed for diesel fuel delivery. It delivers a flow rate of approximately 110 l/h within a pressure range of 10000–20000 mbar. The pump operates with fuel temperatures from 0 to 60 °C and fuel viscosities from 2 to 75 cst. It features an 8 mm shaft diameter, clockwise rotation, and a maximum speed of 3600 rpm.

When selecting an oil pump of this type, ensure the shaft diameter, rotation direction, and connection sizes match the burner's specifications. The pump's pressure range and flow rate must be compatible with the system's requirements. Verify the fuel temperature and viscosity limits align with the fuel used. Mounting dimensions and the type of valve (integrated pressure regulating and cut-off) should also be confirmed before installation.

Common failures in oil pumps of this kind include loss of pressure, leading to burner ignition issues or unstable flame. A worn internal gear may cause reduced flow, resulting in incomplete combustion or soot formation. Leaks at the shaft seal can cause fuel drips and pressure drops. If the pump becomes noisy or fails to start, check for contamination in the fuel or a blocked filter.