Adjust by the adjusting gasket inside. The fewer pieces, the tighter the replacement step: remove the front water tank and fan blades. Remove the generator belt and compressor belt. Remove the four 8-angle screws on the crankshaft pulley and the front pulley to remove the fan belt. During installation, the four screws on the pulley cannot be tightened at one time, and the crankshaft nut needs to be turned continuously. Until the belt is tightened. Take a closer look. It should be replaceable.