This dirt removal installation is composed of the internal magnetic balls and the external spiral copper guided tube. The user can purify the gearbox anytime without stopping the production line and draining the oil. The innovated installation is applied with the principle of magnetic adsorption. These greasy iron chipping particles can be adsorbed on the magnetic balls tightly without any electricity power driving. This worldwide pioneer design is not only met with energy saving demand, but also greatly enhance the purity of the gearbox, decrease the precipitation of the iron chipping particles. With this specific installation, the durability life of the gear oil and gearbox can be extended up to 30~40%. This innovated design had been applied for Germany, Japan, Taiwan, China worldwide patents.