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1.故障现象1台SD7型推土机使用过程中,操作人员将推土铲提升到最高位置后,推土机行走距离不足20m,推土铲突然从最高位置自动下沉约1m,严重影响推土机的正常作业。操纵推土铲升降控制阀手柄,推土铲可以自由升降,没有卡滞现象。出现自动下沉现象后,驾驶员试图用推土铲将推土机前部顶离地面。但将推土机顶起后其前部迅速下
1. Symptom 1 SD7-type bulldozers used, the operator will push the bulldozers to the highest position, bulldozers walking distance of less than 20m, bulldozers suddenly from the highest position automatically sink about 1m, seriously affecting the normal operation of bulldozers . Manipulating blade lifter control valve handle, blade can be free to lift, there is no jamming phenomenon. After an automatic sinking, the pilot attempted to lift the front of the bulldozer off the ground with a dozer blade. However, after pushing the bulldozer up quickly under its front