Dongguan Wan Jiang Ling-car dealers Technology Center computer sewing machine is noisy, often we need to pay special attention to troubleshoot the device hidden in advance in order to avoid an accident or a defective product. The so-called "noise" refers to the computer sewing in high-speed operation is not normal friction sound, percussion and loose sound. The computer sewing occurrence of unusual noise, we can identify the following aspects where the machine malfunctions, how to deal with these noise occurs. Bevel gear teeth meshing varies, cause gear noise occurs at high speeds. We can relax the fastening screws of the bevel gear teeth meshing uneven. Contact with the sleeve in a relaxed and bevel gear shaft fastening screws, we should knock stick to knock teeth meshing level of position, then tighten the bevel gear and bushing fastening screws. Axis, vertical axis, the lower shaft axial caused by loose sound. We can relax the the gear two fastening screws, re-adjust the vertical axis, on the lower shaft of the axial gap. 3 bevel gear tooth surface meshing gap is too large or too small, resulting in a sound failure. We can be corrected by tapping sleeve, general gear gear meshing gap between 0.20mm ~ 0.40mm. 4 Gear poor quality. The two pairs of tooth surface plus a small amount of abrasive paste, hand, put rotational last round, about 10 to 15 minutes. In addition, we can use kerosene to clean the dirt, slightly oil, and then require adjusting the gap. The hook and the hook gap is too large. We can adjust the rotary hook and the hook gap from 0.45mm to 0.65mm range. Hydraulic system failure, lack of oil moving parts. We check or adjust the amount of oil of the oil system. Rack or head installation is not stable. For this, we can adjust the rack or head to make it smooth.