Precautions when installing the pulley: 1, last cleaned before assembly must use petrol to ensure that all parts clean and dry, in order to ensure close cooperation with the surface and free of oil, there is enough friction. 2, prior to assembly with hex bolt assembly also use gasoline wash and dry, not the bolt or screw holes in the coating of oil or grease Bushes, after bolting to ensure there is enough friction self-locking capability. 3, within three hex bolts fastening turns need to be installed in place in order to ensure uniform sleeve by axial force to ensure the pulley and sleeve coaxially positioned well. 4, pre-installation check the measurement assembly with hex bolt length to ensure that after the assembly bolts can withstand the drogue blind hole at the bottom, in order to ensure that the cone closely, and to ensure that the bottom of the blind hole bolt by reverse thrust, produce the same principle of double nut locking effect. 5, after fastening the cable pulley to check and adjust the master, the driven pulley relative position of the European standard Bushes, ensuring two rounds in the same plane and the belt tensioner moderate. 6, the pulley cover should be in good condition and securely installed to ensure operation in a broken belt or pulley loose exits lead to major accidents. 7, the sleeve are wearing parts, after a long run with the Bushes, the hole and chain groove damage that may occur, should be checked before each assembly, spare parts found defective pulley should be replaced with what material? Why iron? Pulleys material is generally cast iron (iron) pulley hub type parts are generally relatively large size, the manufacturing process generally casting, forging based. Generally designed for larger size casting method Bushes specifications, materials are generally cast iron (casting performance is better), rarely used steel; generally small size, can be designed for forging, the material is steel. Common gray cast iron, steel, aluminum or plastic and so on. Gray cast iron with the most, with HT200 V≤30m / s when, V≥25 ~ 45m / s, cast iron or steel, also available in steel stamping - welding cast iron pulley manufacturers Bushes, Bushes, Hengda Machinery by Texas Heng Machinery Limited. Texas Hengda Machinery Co., Ltd. (www.sddzhdjx.com) (www.sddzhdjx.com) strong, credible, in Dezhou machining industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Hengda Machinery and you hand into the brilliant, for a better future!