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发动机严重变音是液压挖掘机在使用中经常遇到的现象之一。本文以常见的PC220－5型液压挖掘机为例，对挖掘机发动机变音现象进行分析，并排除可能造成故障之隐患。
Serious engine noise is one of the phenomena that hydraulic excavators often encounter during use. This paper takes the common PC220-5 hydraulic excavator as an example to analyze the phenomenon of engine excavator change, and eliminate the hidden trouble that may cause failure.