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挖掘机常见故障往往可以从噪声大小、尾气颜色、工作状况等3个方面进行诊断和检修。一、从液压系统噪声诊断液压故障1.液压泵噪声(1)液压泵吸空当液压油中混入空气后,易在高压区形成气穴,并以压力波的形式传播,造成油液振荡,导致系统产生噪声。其主要原因有:液压泵的滤油器、进油管堵塞或液压油黏度过高,造成液压泵进油口处真空度过高,使空气渗入;液压泵、先导泵轴端油封损坏或进油管密封
Excavators common faults can often be from the noise size, exhaust color, working conditions, such as 3 aspects of diagnosis and overhaul. First, the diagnosis of hydraulic pressure from the hydraulic system noise fault 1. Hydraulic pump noise (1) suction pump air When the hydraulic oil mixed with air, easy to form cavitation in the high pressure area, and the form of pressure wave propagation, resulting in oil oscillation, resulting in The system produces noise. The main reasons are: hydraulic pump oil filter, blockage of the oil pipe or the viscosity of the hydraulic oil is too high, resulting in excessive vacuum at the inlet of the hydraulic pump, so that the air infiltration; hydraulic pump, pilot shaft seal damage or into the oil pipe seal