During the operation of the loader, the failure rate of the gearbox caused by improper use and maintenance has been high, especially the failure to strictly abide by the maintenance procedures in use, and the lack of timely inspection and daily maintenance will accelerate the damage and failure of the gearbox, and even expand the severity of the failure. What are the main reasons for the low pressure of the gearbox of the loader?

装载机变速箱压力过低的主要原因有以下几个方面：

The main reasons for the low pressure of loader gearbox are as follows:

1、管路油封严重漏油

1. Serious oil leakage of pipeline oil seal

检查变速箱油底壳变速泵吸油管路的密封性，如果发现有泄漏的地方，应该检修或更换管路。

Check the tightness of the oil suction pipeline from the transmission oil pan to the transmission pump. If leakage is found, repair or replace the pipeline.

2、调压阀调整不合适

2. Improper adjustment of pressure regulating valve

调压阀通过调压阀芯可以控制变速箱的输出压力的大小，输出压力太小就会导致变速油压过低。

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.

将调压阀调整到规定值，取出调压弹簧，可以看到调压阀芯。当系统的压力不足1.08MPa的时候，去掉一个调压圏，缩短调压阀固定套的长度，反之增加，将调压阀调到合适的参数。

Adjust the pressure regulating valve to the specified value, take out the pressure regulating spring, and you can see the pressure regulating valve core. When the pressure of the system is less than 1.08mpa, remove a pressure regulating ring, shorten the length of the fixed sleeve of the pressure regulating valve, otherwise increase, and adjust the pressure regulating valve to appropriate parameters.

3、减压阀调压弹簧被损坏

3. The pressure regulating spring of the pressure reducing valve is damaged

减压阀的作用是，可以通过调压弹簧把较高的输入压力调节到规定输出压力，并保持输出压力的平衡。减压阀的调压弹簧一旦被损坏，变速箱将不能正常输出压力。

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 maintain the balance of the output pressure. Once the pressure regulating spring of the pressure reducing valve is damaged, the transmission will not output pressure normally.

方法：检查调压弹簧是否被损坏，具体方法如下：拆下蓄能器的堵头螺栓，取出蓄能器活塞，直到看到调压弹簧，检查弹簧是否失去弹性，弹簧座是否出现断裂，阀杆或蓄能活塞是否被卡死，导致无法调压弹簧。

Solution: check whether the pressure regulating spring is damaged. The specific methods are as follows: remove the plug bolt of the accumulator and take out the accumulator piston until the pressure regulating spring is seen. 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.

4、变速箱滤清器出现堵塞

4. The transmission filter is blocked

液力传动油滤清器被堵塞，导致供油不畅，也会导致变速箱出现油压太低，应该查找堵塞的原因，及时更换油液以及滤清器。

The hydraulic transmission oil filter is blocked, resulting in poor oil supply and too low oil pressure in the transmission. Find out the cause of the blockage and replace the oil and filter in time.

装载机变压箱的正常压力范围在1.08~1.47MPa之内，如果变速箱油压太低，会导致装载机驱动力不足，整机无力，无法挂挡，引发这个故障的主要原因有以上4点，希望大家可以熟知并掌握。

The normal pressure range of the loader transformer box is within 1.08 ~ 1.47mpa. If the oil pressure of the gearbox is too low, the driving force of the loader will be insufficient, the whole machine will be unable to gear, and the main causes of this fault are the above four points. I hope you can know and master them.

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