自动上料搅拌车的出现和使用，能够为各类工程施工提供了诸多的便利，这些都是自动上料搅拌车的功劳，在使用的程度上提升了该设备的作业效率。使用人员要想保障自动上料搅拌车的使用性能，其中，一个重要的配件就是变速器换挡机，每一种配件使用时间长了，都会出现一些问题，在它损坏后如何进行维修呢？笔者来讲解一下。
The appearance and use of the automatic feeding mixer can provide many conveniences for various engineering construction, which are all the contributions of the automatic feeding mixer, and improve the operating efficiency of the equipment to the extent of use. In order to ensure the service performance of the automatic feeding mixer, one of the important parts is the transmission shifter. Every part will have some problems when it is used for a long time. How to repair it after it is damaged? Let me explain.

1、自动上料搅拌车离合器损坏的原因动力换挡变速器离合器接合时，液压油的压力克服弹簧力压紧摩擦片。随着液压油压力的升高，摩擦片与金属盘接触并逐渐压紧，使离合器将飞轮动力平稳地传递到变速器输人轴。每次换挡时，摩擦片都要与钢片发生摩擦，产生的热量由冷却液散发出去。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。
1. Causes of clutch damage of automatic feeding agitator truck when the clutch of power shift transmission is engaged, the pressure of hydraulic oil overcomes the spring force to compress the friction plate. With the increase of hydraulic oil pressure, the friction plate contacts with the metal plate and is gradually compressed, so that the clutch smoothly transmits the flywheel power to the transmission input shaft. Every time when shifting, the friction plate will rub with the steel plate, and the heat generated will be dissipated by the coolant. When the friction plate and steel plate become thinner, more hydraulic oil is required to make them fully engaged. The engine must further accelerate, and the sliding time of the friction plate on the steel plate will also be extended. The resulting friction heat will also be more, which will increase the temperature of the hydraulic oil. When the temperature is enough to change the performance of the seals in the transmission, the transmission will have internal leakage. The internal leakage continues to cause the increase of heat from two aspects: the high pressure oil leaks through the damaged seal, making the oil temperature continue to rise; Due to oil leakage, the hydraulic pump must deliver more oil to ensure the pressure required to engage the clutch, so that the clutch can be fully engaged. This also requires the engine to continue to accelerate, so that the hydraulic pump can produce greater flow. Such a vicious cycle will inevitably lead to overheating or burning of the clutch until it is completely ineffective.