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W-4、WK-4型挖掘机推压强迫通风电动机(0.75kW),每年至少损坏3台,不但造成一定的经济损失且影响生产的正常进行。其原因是:(1)推压部位在露天工作,雨雪
W-4, WK-4 excavator forced forced air motor (0.75kW), damaged at least 3 each year, not only causing some economic losses and affecting the normal production. The reason is: (1) pressing parts work in the open air, rain and snow