1．油缸進了空氣
1 cylinder into the air
這是產生爬行的主要原因之一，也是液壓機油缸產生不正常聲音和抖動的重要原因之一。
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．滑動金屬面的摩擦聲
2 friction sound of sliding metal surfaces
當滑動面配合過緊，或者因拉毛拉傷，會出現接觸面壓過高，油膜被破壞，造成干摩擦聲，拉傷則造成機械摩擦聲。當出現這種不正常聲響時，應立即停車，查明原因。否則可能導致滑動面的燒接，釀成更大事故。
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．內部泄漏也會產生異常聲響
3 internal leakage will produce abnormal sound
因缸壁脹大，活塞密封損壞等，壓油腔的壓力油通過縫隙高速泄往回油腔，常發出帶“咝咝”聲的不正常聲音，應予以排除。
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．因密封而產生的摩擦聲和振動
4 friction sound and vibration caused by sealing
①V形密封圈被過度壓緊橡膠(常用)制造的V形圈會因此而產生摩擦聲(較低沉)和振動。
V - shaped sealing ring is over - pressed rubber(commonly used) - made V - ring will therefore produce friction sound (lower)and vibration.
②防塵密封如L形和U形密封圈壓得過緊，從形態上看，具有刮削污物的效果。但如果刮削力過大，則滑動面的油膜將被切破而發生異常聲響。遇此情況，可適當減少調節力，用很細的金相砂紙輕輕打磨密封唇邊的飛邊和活塞桿的外圓面，旋轉打磨，不要直線打磨，打磨時注意勿使唇邊和活塞桿受傷，否則解決了噪聲，引來了漏油。必要時可更換液壓機唇邊光潔無飛邊的密封圈。支承環外徑過大要減少。
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.
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