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1.故障现象1台GJW111型轮胎式液压挖掘机,在行驶过程中突然自动减速,直至渐渐停止。驾驶员再次挂上前进Ⅰ挡,挖掘机不是向前行驶,而是向后倒退。驾驶员在前进Ⅰ、Ⅱ挡之间切换,依然只能倒退行驶。挂倒挡后,挖掘机倒退行驶正常。2.传动系统原理该挖掘机行走系统采用液压机械式传动,前进、倒退及行驶速度由液压系统控制。主泵输出的压力油驱动变速器上的2个变量液压马达旋转,将动力传递到变速器的2个输入轴上,
1. Symptom 1 GJW111 type tire hydraulic excavator suddenly slows down automatically until it gradually stops. The driver again hung forward Ⅰ block, the excavator is not driving forward, but backward backward. The driver in advance Ⅰ, Ⅱ block switch, still can only go backwards. After the reverse gear, the excavator back to normal driving. 2. The principle of the transmission system The excavator travel system using hydraulic mechanical transmission, forward, backward and speed control by the hydraulic system. The main pump output pressure oil drives two variables on the transmission hydraulic motor rotation, the power transmitted to the transmission on the two input shaft,