Basic check items for automotive automatic transmissions and fault diagnosis methods for manual shifting tests, the electronic control system and the hydraulic system are introduced.

论述了汽车自动变速器的基本检查项目及手动挡试验、电控系统、液压系统等方面的故障诊断方法。

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Lifting control valve is the control center of hydraulic lifting system of dumpers, which is classified into electromagnetic type, electro-hydraulic type, manual type and air-powered type, etc.

举升操纵阀是自卸汽车液压举升系统的控制中心，该操纵阀分为电磁式、电液式、手动式和气动式等几种。

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