As one of the common construction machinery in life and work, small loader greatly improves the work efficiency, but after a long time of use or careless maintenance, small loader will still have some problems, such as abnormal noise in the crankcase of loader.

小型装载机高速运转时，如果出现“咯噔、咯噔”闷击声，减小油门时尤为明显，这是主轴瓦轴向间隙过大所致；沿汽缸上下各处均有类似小铁锤轻击铁块的声音，排气管冒蓝烟（伴有烧机油现象），用长柄螺丝刀抵在汽缸体处更容易听到，即可断定是活塞环侧隙过大或环折断所致。

When the small loader is running at high speed, if there is a "click, click" dull sound, it is particularly obvious when reducing the throttle, which is caused by the excessive axial clearance of the main shaft pad; There is a sound similar to the sound of a small hammer tapping an iron block up and down the cylinder, and the exhaust pipe emits blue smoke (accompanied by oil burning). It is easier to hear when touching the cylinder block with a long handle screwdriver. It can be concluded that it is caused by excessive side clearance of the piston ring or broken ring.

在装载机汽缸全长部位听到沉闷的“空咚、空咚”敲击声，且打开加机油口盖时发现有气泡（说明有漏气现象），这是活塞与缸套配合间隙过大所致；若在同一部位略靠曲轴方向听到“嘎、嘎、嘎”撞击声，则是连杆扭曲致使其在工作中摇摆产生的敲击声，后两种声响在改变柴油机转速时更明显，且较易于区别。

A dull knocking sound of "empty thump, empty thump" is heard at the full length of the loader cylinder, and bubbles are found when opening the oil filler cover (indicating air leakage), which is caused by the excessive matching clearance between the piston and the cylinder liner; If the impact sound of "GA, GA, GA" is heard in the same part slightly close to the crankshaft, it is the knocking sound caused by the swing of the connecting rod due to the distortion of the connecting rod. The latter two sounds are more obvious when changing the speed of the diesel engine and are easier to distinguish.

当装载机突然改变负荷时，在曲轴箱附近可清晰地听到短促的钝哑的敲击声，并随负荷或转速的增加而急剧变化，响声大，无负荷时则不明显。这是连杆瓦过度磨损而造成连杆瓦与连杆轴颈配合间隙过大所致；若使柴油机某缸断油，如果此异响立即消失，则说明是该缸的连杆瓦响。

When the loader suddenly changes the load, the short dull knocking sound can be clearly heard near the crankcase, and changes sharply with the increase of load or speed. The sound is loud, but it is not obvious when there is no load. This is caused by excessive wear of connecting rod bush, resulting in excessive fit clearance between connecting rod bush and connecting rod journal; If the oil of a cylinder of the diesel engine is cut off, if the abnormal noise disappears immediately, it means that the connecting rod bush of the cylinder makes a noise.

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