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1.故障现象1台使用了9800h的5t型装载机在施工现场作业过程中,其动臂操纵手柄扳动逐渐变得沉重,甚至出现动臂换向阀阀芯卡滞现象,影响该机正常使用。该故障具有如下特点:装载轻物料时,动臂换向阀阀芯卡滞情况较轻;装载重物料时,动臂换向阀阀芯卡滞情况较重。装载质量相同的物料,从下降状态返回中位与从举升状态返回中位相比,前种情况操作时动臂换向阀阀芯卡滞更为严重。与动臂换向阀阀芯沉重或卡滞相比,铲斗阀阀芯工作正常。5t机型装载机工作装置液压系统如图1所示。
1. Symptom 1 Taiwan 9800h 5t-type loader in the construction site operation process, the boom control lever gradually becomes heavy, and even boom valve spool jamming phenomenon, affecting the normal machine use. The fault has the following characteristics: Loading light material, boom valve spool jamming lighter; loading heavy material, the boom valve spool jammer heavier. Load material of the same mass, return to neutral from the lowered position The boom directional valve poppet is more deadlocked when operated in the former case than in the neutral position returned from the raised position. Compared with the heavy or staggered boom valve spool, bucket valve spool work properly. 5t loaders working machine hydraulic system shown in Figure 1.