石川岛ＣＣＨ２５０ＷＥ轮胎起重机是一种全液压起重机，该机使用中的一些常见故障如下。 故障一：无机械钩（所谓无机械钩是指吊钩不能以自身重力自行降落）。其结果是影响工作效率，直接原因是内涨式离合器涨带打不开，如附图所示。 当转换开关接到左位时，电磁阀得电；当开? Ishikawajima CCH250WE tire crane is a full hydraulic crane, aircraft use some of the common faults are as follows. Fault 1: no mechanical hook (the so-called no mechanical hook means that the hook can not fall on its own gravity). The result is the impact on work efficiency, the direct reason is that the up-type clutch up band can not be opened, as shown in the figure. When the switch is connected to the left position, the solenoid valve is energized;