1. When the clutch of power shift transmission is engaged, the pressure of hydraulic oil overcomes the force of spring to press the friction plate. With the increase of the hydraulic oil pressure, the friction plate contacts with the metal plate and gradually compresses, which makes the clutch transfer the flywheel power to the transmission shaft smoothly. Every time the gear is shifted, the friction plate will rub with the steel plate, and the heat generated will be sent out by the coolant.

当摩擦片及钢片变薄时，为了使它们充分接合就需要更多的液压油，发动机须进一步加速，摩擦片在钢片上的打滑时间也随之延长，由此产生的摩擦热量也会更多，促使液压油的温度增加，当达到足以改变变速器中密封件性能的温度时，变速器就会产生内泄而内泄又从两个方面继续引起热量的增加：高压油经损坏的密封处泄漏，使油温继续升高；由于漏油，液压泵势必要输送更多的油液来保证接合离合器时所需的压力，使离合器充分地接合，这也要求发动机继续加速，使液压泵产生更大的流量。如此恶性循环，必将导致离合器过热或烧损，直完全失效。

When the friction plate and steel plate become thinner, more hydraulic oil is needed in order to make them fully engage. The engine must be further accelerated, and the sliding time of friction plate on steel plate will also be prolonged, resulting in more friction heat, which will increase the temperature of hydraulic oil. When the temperature is enough to change the performance of sealing parts in the transmission, the transmission will have internal leakage and internal leakage And from two aspects continue to cause the increase of heat: high pressure oil leakage through the damaged seal, so that the oil temperature continues to rise; due to oil leakage, the hydraulic pump is necessary to deliver more oil to ensure the pressure required to engage the clutch, so that the clutch is fully engaged, which also requires the engine to continue to accelerate, so that the hydraulic pump produces greater flow. Such a vicious cycle will lead to overheating or burning of the clutch until complete failure.

2、自动上料搅拌车离合器活塞密封性的检测装载机行走无力或油温过高时，就需要判断是离合器活塞密封不严还是油压不足起的，但常规检测手段有时很难断定是哪个原因引起故障，尤其是在无动力的情况下，检查组装好的变速器总成的各密封环就更困难了。此时，可采用气压阀进行测试。

2. When the loader cannot walk or the oil temperature is too high, it is necessary to judge whether the clutch piston seal is not tight or the oil pressure is insufficient. However, it is difficult to determine which cause the fault by conventional detection methods, especially in the case of no dynamic force, it is more difficult to check the seal rings of the assembled transmission assembly. At this time, the pneumatic valve can be used for testing.

，将自动上料搅拌车变速器控制阀拆掉（对组装好的变速器应在装控制阀之前），然后依次给变速器各油孔通人0.6一0.8MPa的气体，若某一个孔通人气体时，听到"嘭"的一声且无漏气声或漏气声很小进口计量泵，则说明与之对应的离合器活塞与缸筒间的密封良好；若听不到活塞压紧摩擦片的声响且漏气声较大，则说明离合器活塞与缸筒间的密封失效，应更换密封件。

Firstly, remove the transmission control valve of the automatic charging mixer (before installing the control valve for the assembled transmission), and then fill the oil holes of the transmission with 0.6-0.8 MPa gas. If a hole is filled with gas, and there is no air leakage or the leakage sound is very small, it indicates that the corresponding clutch piston and cylinder barrel are well sealed If the sound of the piston pressing the friction plate is not heard and the air leakage is large, the seal between the clutch piston and cylinder barrel is invalid, and the seal should be replaced.

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