一台RTC-8028型全液压汽车起重机,在起吊重物时出现滑钩现象。首先,检查了起升机构的液压系统(见附图),压力均正常;然后,对起升卷筒进行拆检,结果是离合器摩擦片完好,弹簧压力正常;最后,发现单向离合器损坏,从而导致吊重物起升、下降回空挡时出现滑钩现象。更换单向离合器后,工作恢复正常;然而经过几个月使用后,又出现吊重物滑钩现象。于是,对卷筒再次拆检,发现制动阀中单向阀 A RTC-8028 full hydraulic truck crane, sliding hook phenomenon occurs when lifting heavy objects. First of all, check the hydraulic system of the hoisting mechanism (see attached drawing), the pressure is normal; then, unwinding the lifting drum, the result is that the clutch friction plate is intact and the spring pressure is normal; finally, it is found that the one-way clutch is damaged, As a result, the hoist lifts up and slips back to neutral. Replacement of one-way clutch, the work returned to normal; however, after a few months after use, there slipping weight slider phenomenon. Then, the re-dismantling of the reel, brake valve check valve found