Among all the common faults of loaders, gearbox problems account for a large proportion. The damage of the gearbox is also the main factor causing the weakness of the loader. Among them, low transmission oil pressure, insufficient transmission system oil or oil leakage, high torque converter oil temperature and poor combination of clutch driving and driven plates will cause insufficient driving force of the loader. Here we list and solve these problems one by one.

装载机变速箱变速油压过低，就会造成装载机驱动力不足、整机无力、挂不上档。装载机变速箱压力过低的主要原因有以下几个方面：

If the transmission oil pressure of the loader gearbox is too low, it will cause insufficient driving force of the loader, weakness of the whole machine and inability to gear up. The main reasons for the low pressure of loader gearbox are as follows:

1、减压阀调压弹簧损坏减压阀的作用是，通过调压弹簧将较高的输入压力调节到规定的输出压力，并保证输出压力的平衡。减压阀的调压弹簧一旦损坏，变速箱将无法保证正常的输出压力。检查调压弹簧是否损坏，具体方法如下：拆下蓄能器的堵头螺栓，掏出蓄能器活塞，可以看到调压弹簧，检查弹簧是否失去弹性，弹簧座是否断裂，阀杆或蓄能活塞是否卡死，造成无法调压弹簧。

1. The pressure regulating spring of the pressure reducing valve is damaged. The function of the pressure reducing valve is to adjust the higher input pressure to the specified output pressure through the pressure regulating spring and ensure the balance of the output pressure. Once the pressure regulating spring of the pressure reducing valve is damaged, the transmission will not be able to guarantee the normal output pressure. Check whether the pressure regulating spring is damaged. The specific methods are as follows: remove the plug bolt of the accumulator, take out the accumulator piston, you can see the pressure regulating spring, check whether the spring loses elasticity, whether the spring seat is broken, and whether the valve rod or energy storage piston is stuck, resulting in the failure of the pressure regulating spring.

2、调压阀调整不当。调压阀通过调压阀芯可控制变速箱的输出压力大小，输出压力过小就会造成变速油压过低。

2. Improper adjustment of pressure regulating valve. The pressure regulating valve can control the output pressure of the transmission through the pressure regulating valve core. If the output pressure is too small, the transmission oil pressure will be too low.

变速箱损坏是造成装载机工作无力的主要原因之一，除了合理的操作之外，正确的保养和选购配件也很重要，在这里还建议用户要正确选用液力传动油，正确的选用液力传动油能大大减少装载机动力系统的故障，另外，选用的液压油应具有良好的低温流动性、合适的高温黏度、良好的热氧化稳定性和抗泡性以及具有良好的抗摩和抗腐蚀性能。

The damage of gearbox is one of the main reasons for the inability of loader to work. In addition to reasonable operation, correct maintenance and purchase of accessories are also very important. Here, it is also recommended that users should correctly select hydraulic transmission oil. The correct selection of hydraulic transmission oil can greatly reduce the failure of loader power system. In addition, the selected hydraulic oil should have good low-temperature fluidity Suitable high temperature viscosity, good thermal oxidation stability and foam resistance, as well as good friction and corrosion resistance.

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