hp-Technik SMG-1625-I-4-10 oil motor pump

The hp-Technik SMG-1625-I-4-10 is an oil motor pump listed under the oil pump stations category. Parts of this type draw fuel from the tank and deliver it to the nozzle at the pressure that sets the firing rate. An integral solenoid valve gives the sharp cut-off required by the burner control. Such pumps are selected by rotation direction, single- or two-pipe operation, capacity and pressure range, shaft and mounting pattern, and connection thread sizes. Pre-heaters are used with heavier oils to improve atomisation; filters protect the pump and nozzle from contamination. When replacing an oil pump of this class, check the drive coupling and shaft alignment to avoid premature wear. The pump must match the existing pipework configuration—two-pipe systems require a return line, while single-pipe systems rely on a de-aerator or internal bypass. The solenoid valve coil voltage must be compatible with the burner control output; a mismatched coil can prevent clean cut-off and cause after-drip. Typical failures in pumps of this type include worn gears, weak pressure regulation, leaking shaft seals, and solenoid coil failure. If the burner fails to shut off cleanly or the pressure fluctuates, inspect the pump before condemning other components.