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1台SD90-5型推土机完成组装后进行推土试验,试验到11h时出现无法转向故障,只得停止推土试验排查故障。该推土机两侧履带的主轴轮毂上设有转向离合器和制动器,均靠液压系统控制。当推土机向某侧转向时,先将转向离合器分离,再用该侧制动器制动,使该侧履带停止移动,推土机即可转向。技术人员按照以上原理,对故障进行了排查。首先,检查液压泵到转向制动阀之间的管
After one SD90-5 bulldozer was assembled, the earth-moving test was conducted. When the test failed at 11h, the earthmoving test was stopped. Steering clutches and brakes are provided on the spindle hubs of both sides of the bulldozer, and are controlled by a hydraulic system. When the bulldozer turns to one side, the steering clutch is disengaged first, and then the side brake is applied to brake, so that the side track stops moving and the bulldozer can turn. Based on the above principles, the technicians conducted troubleshooting. First, check the tube between the hydraulic pump and the steering brake valve