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1.故障现象PD410-1型推土机推土铲的下降操纵有快速下降与低速下降2种模式。以较小的角度向下扳动推土铲升降操纵手柄时,推土铲应慢速下降。将下降操纵手柄按到底时,推土铲会快速下降。在对2台该型推土机进行出厂检验时,以较小角度向下扳动这2台推土铲升降操纵手柄时,这2台推土机推土铲均出现下降速度过快现象。经过反复调试,快速下降故障依然存在。2.故障排查推土铲异常快速下降的原因可能有以下4种:一是液压系统压力不正常,导致推土铲控制失灵;二是推土铲升降阀阀孔与阀芯间隙过大,产生内泄;三是推土铲升降缸活塞处油封损坏,造成推
1. Symptom PD410-1 bulldozer bulldozers down control has two modes, rapid decline and low-speed decline. When moving the dozer handle downwards with a small angle, the dozer should slowly descend. When lowering the joystick all the way down, the blade will quickly fall. When carrying out the factory inspection of the two bulldozers of this type, the two bulldozers did not descend too fast when the two dozer lift handles were pulled downward at a relatively small angle. After repeated debugging, rapid decline still exists. 2. Troubleshooting Bulldozers abnormal rapid decline in the reasons may have the following 4 kinds: First, the pressure of the hydraulic system is not normal, resulting in blade control failure; Second, the blade lift valve hole and the valve clearance is too large, resulting Internal leakage; third is the blade lift cylinder piston seal damage, resulting in push