工程机械常因电气系统故障而直接影响机械的正常工作和使用寿命。造成故障的原因很多，有设计、制造和选材等方面的原因，也有驾驶员不注意技术保养，对电器故障处理不当和使用不正确等方面的原因。一、故障及原因1．蓄电池许多生产厂在电器的设计、制造和选材等方面一直采用老 Construction machinery often due to electrical system failure directly affect the normal work of machinery and life. Cause a lot of reasons for failure, there are design, manufacturing and material selection and other reasons, but also the driver did not pay attention to technical maintenance, improper handling of electrical failures and the use of incorrect reasons. First, the failure and causes 1. Many battery manufacturers in the electrical design, manufacture and selection of materials has been using the old