The emergence and use of concrete mixer truck can provide a lot of convenience for various engineering construction. These are the credit of automatic loading mixer truck, which improves the operation efficiency of the equipment to the extent of use. If users want to ensure the use function of the automatic feeding mixer, one of the important accessories is the transmission shifter. If each accessory is used for a long time, there will be some problems. How to repair it after it is damaged? Follow Xiaobian to learn about it.
1. The reason for the damage of the clutch of the mixer truck when the clutch of the power shift transmission is engaged, the pressure of the hydraulic oil overcomes the tension spring force to press the collision plate. With the increase of hydraulic oil pressure, the collision plate and metal plate touch and compress gradually, so that the clutch can smoothly transfer the flywheel power to the transmission input shaft. During each shift, the collision plate will conflict with the steel plate, and the heat generated will be sent out by the coolant.
When the conflict plate and steel plate become thinner, more hydraulic oil is needed to make them fully engaged. The engine must be further accelerated, and the slip time of the conflict plate on the steel plate will also extend, resulting in more conflict heat, which will promote the temperature of the hydraulic oil to be added. When the temperature reaches the temperature sufficient to change the function of the seal in the transmission, the transmission will leak internally.
The internal leakage continuously causes the addition of heat from two aspects: the high-pressure oil leaks through the damaged seal, making the oil temperature rise continuously; Because of oil leakage, it is necessary for the hydraulic pump to deliver more oil to ensure the pressure required to engage the clutch and fully engage the clutch, which also requires the continuous acceleration of the engine and greater flow of the hydraulic pump. Such a vicious cycle will inevitably lead to overheating or burning of the clutch until it completely fails.
2. The detection of the tightness of the clutch piston of the mixer is also very important. When the loader has no power to start and travel and the oil temperature is too high, it is necessary to judge whether it is caused by the loose sealing of the clutch piston or the lack of oil pressure, but it is sometimes difficult to determine which cause the problem by conventional detection methods, especially in the case of no power, it is more difficult to check the sealing rings of the assembled transmission assembly.
At this time, the pneumatic valve can be used for test. First of all, remove the control valve of the transmission of the automatic feeding mixer truck (for the assembled transmission, it should be before the control valve is installed), and then fill each oil hole of the transmission with 0.6-0.8mpa gas in turn. If a hole is filled with gas, a "bang" sound is heard without air leakage sound or the air leakage sound is very small, It indicates that the seal between the corresponding clutch piston and cylinder barrel is good; If you can't hear the movement of the piston pressing the collision plate and the sound of air leakage is large, it indicates that the seal between the clutch piston and the cylinder barrel is invalid and the seal should be replaced.