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1台小松WA380-3型装载机,出现只有前进挡和中位挡而没有倒退挡的故障。此故障可从液压和电气系统2大方面进行排查。1.液压系统分析WA380-3型装载机变速器液压回路如图1所示,结合该液压回路分析其故障产生的原因如下:(1)倒退电磁阀故障挂倒挡时,方向选择阀19右侧的控制油流应流回油箱。如果倒退电磁阀15电路断路、线圈断路,或其阀芯卡滞在通油位置,就始终有先导油作用在方向选择阀19的右侧。方向选择阀19始终无法移向
1 Komatsu WA380-3 loader, there is only forward and neutral gear without reverse gear failure. This fault can be investigated from the hydraulic and electrical systems 2 major aspects. 1. Hydraulic System Analysis WA380-3 loader hydraulic transmission circuit shown in Figure 1, combined with the hydraulic circuit analysis of the causes of its failure are as follows: (1) reverse the solenoid valve linked to the block, the right side of the direction selector valve 19 The control oil flow should flow back into the tank. If the reverse solenoid valve 15 circuit is open, the coil is open, or its spool stuck in the open position, pilot oil will always be applied to the right of the directional selector valve 19. Directional selector valve 19 always fails to move