hp-Technik UHE-A4-M-I-4-20 oil pump

The hp-Technik UHE-A4-M-I-4-20 oil pump is a component listed under catalogue article 543.520.023 and manufacturer codes 4130544 and 543.520.023. Parts of this type draw fuel from the tank and deliver it to the nozzle at a pressure that sets the firing rate. An integral solenoid valve provides the sharp cut-off that the burner control demands. In an oil-fired burner, the pump works between the fuel supply line and the nozzle; it is typically driven by the burner motor shaft. Selection of such a pump is based on rotation direction (clockwise or counter-clockwise), whether the system uses single-pipe or two-pipe operation, the required capacity and pressure range, the shaft and mounting pattern, and the connection thread sizes. Some pumps in this class may include a preheater for heavier oils and a filter to protect the pump and nozzle. When replacing a pump of this type, common failure modes include worn gears that reduce delivery, weak pressure regulation leading to unstable firing, leaking shaft seals, and solenoid coil failure that prevents the burner from cutting off cleanly. Always confirm the rotation direction and pipe configuration of the existing installation before ordering a replacement.