小四轮柱塞式液压泵常见故障之一,是单向阀和安全阀密封不严,影响提升时间和提升力,严重者农具无法升起。因此,要注意检查其密封性,必要时进行研磨。安全阀的开启压力可在试验台上进行调整,调整无效时可更换钢球并研磨阀座接触面。应用φ7毫米的钢球,用锡焊上一段细钢筋作为手柄,组成一个研磨工具。在钢球上涂些细气门研磨砂,放入安全阀钢球阀座,用手旋转钢筋手柄,轻轻进行研磨5分钟,然 One of the common faults of the four-wheel plunger pump is that the one-way valve and the safety valve are not tightly sealed, which affects the lifting time and the lifting force, and the farm implements can not rise in severe cases. Therefore, pay attention to check its sealing, if necessary, grinding. The relief pressure of the safety valve can be adjusted on the test bench, the steel ball can be replaced and the contact surface of the valve seat can be polished when the adjustment is ineffective. Application φ7 mm steel ball, with a section of thin steel bar as a handle, forming a grinding tool. Apply some fine valve grinding sand on the steel ball and put it into the ball valve seat of the safety valve. Rotate the steel handle by hand and gently grind it for 5 minutes