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(1)推土板不能提升。其原因如下:一是溢流阀故障或调节不当,系统工作压力不足;二是补油单向阀卡死在打开位置;三是推土液压泵口活塞密封损坏;四是吸油滤清器口堵塞或液压泵吸油不畅或因油面低吸进空气;五是液压泵故障造成输出的油液压力不足;六是推土缸换向阀内漏或换向操作不到位。(2)推土板的自由下落量过大。如推土缸内漏,压力油通过活塞密封漏往回油腔,会造成推土板下落,可采用更换活塞
(1) Bulldozers can not be raised. The reason is as follows: First, the relief valve failure or improper regulation, the system pressure is not enough; second charge check valve stuck in the open position; Third, push the hydraulic pump port piston seal damage; Fourth, the suction filter mouth Blockage or hydraulic pump poor suction or low suction into the air due to the oil surface; five is the hydraulic pump failure caused by the output of the hydraulic pressure is insufficient; Sixth earth cylinder valve leakage or commutation operation is not in place. (2) the amount of free fall of bulldozing plate is too large. If the earth leakage cylinder, the pressure oil leaks through the piston seal back to the oil chamber, will cause the fall of the earth board can be replaced piston