一台WA470—3型装载机在工作1万h后,在作业过程中出现出现Ⅰ、Ⅱ挡行走无力,满负荷时几乎无法工作,由于其他动作基本正常,说明变矩器发生故障的可能性不大。经检测,发现变速器油压偏低,各部油管路未发现明显漏油现象;拆下滤芯,发现滤芯比较脏,清洗后试机,油压仍然偏低;拆检变速泵,发现其端面磨损比较严重,齿隙较大,更换后油压恢复正常,但试机时发现满负荷工作时仍然无力;拆检变速器油底磁性滤网,发现有大量的金属粉末和油泥,且变速器油异常增多。初步分析认为,液压 When a WA470-3 loader is working for 10,000 h, it appears that during the working process, the first and second stops can not walk and can not work at full load. Since the other movements are basically normal, it shows the possibility of the torque converter malfunctioning Not big. After testing, it was found that the oil pressure in the transmission was low, oil leakage was not found in the oil pipelines of all departments. The filter was removed and the filter was dirty. After cleaning, the oil pressure was still low. Disassemble the variable speed pump and found that the end wear Serious, large backlash, the oil pressure returned to normal after the replacement, but the test machine was found to be full capacity work is still weak; dismantling the bottom of the transformer oil filter and found a large number of metal powder and sludge, and an abnormal increase in transmission oil. Preliminary analysis that, hydraulic