1 cylinder into the air
This is one of the main causes of the crawl, andit is also one of the important reasons for the abnormal sound and jitter ofthe oil cylinder.
2 friction sound of sliding metal surfaces
When the sliding surface with tight, or because ofa sprained galling, contact surface pressure is too high, oil film isdestroyed, resulting in dry friction sound, strain is caused by mechanicalfriction sound. When this abnormal sound occurs, should immediately stop,identify the cause. Otherwise, it may lead to the burning of the slidingsurface and lead to more accidents.
3 internal leakage will produce abnormal sound
Due to the swell of the cylinder wall, piston sealdamage, pressure oil cavity pressure oil through the gap, the high speedsluicing back oil chamber, often make the hissing sound abnormal sound shouldbe excluded.
4 friction sound and vibration caused by sealing
V - shaped sealing ring is over - pressed rubber(commonly used) - made V - ring will therefore produce friction sound (lower)and vibration.
The dust seal such as L shaped and U shapedsealing ring too tight, from the morphological point of view, with the effectof scraping dirt. But if the scraping force is too large, then the slidingsurface of oil film will be cut and the occurrence of abnormal noise. Encounterthis situation, appropriate to reduce the regulation in force, with very finemetallographic sandpaper grinding gently fly edge and piston rod outer roundsurface of the sealing lip, rotating polishing（www.kougasha.net）, not a straight line grinding,polished pay attention not to make the lips and the piston rod is injured orsolve the noise, attracted to the oil spill. The sealing ring can be replacedwhen necessary to finish without burr of the lips. Bearing ring diameter toolarge to reduce.