The operators of small concrete mixing truck can only operate after professional training. The pumped concrete shall meet the pumpability requirements of concrete pump truck. Concrete pump truck pumping operation key can refer to the use of concrete pump. When the pumping is interrupted for more than 5 minutes, the concrete in the end hose must be discharged. Otherwise, due to the end of the concrete dehydration in the hose, the concrete will be sprayed fiercely and splashed around when pumping again, so the end hose is easy to be damaged. In order to change the orientation of the boom or concrete pump truck and need to fold, expand or recycle the distributing boom, first reverse the pump for 1 ~ 2 times and then act, so that the concrete placed in the conveying pipeline can fall or splash.

管道清洗有两种方法水洗和气洗。不管是水洗或气洗，都要将阀箱体和料斗清洗洁净。水洗时，把用水浸过的扎成圆柱形的水泥袋和清洗球先后装进已清洗洁净的锥管中，接上锥管、管道，关闭卸料门，再向料斗注满水。泵送水，直到清洗球从输送管的前端冒出中止。气洗即压缩空气吹洗，是把浸透水的清洗球先塞进气洗接头，再接与变径管相接的榜首根直管，并在管道的结束接上安全盖，安全盖的孔口要朝下。

There are two methods of pipeline cleaning: water washing and air washing. Whether it is water washing or air washing, the valve box and hopper should be cleaned. When washing with water, put the cylindrical cement bag and cleaning ball soaked with water into the cleaned taper pipe, connect the taper pipe and pipe, close the discharge door, and then fill the hopper with water. Pump water until the cleaning ball comes out from the front of the delivery pipe. Air cleaning, namely compressed air blowing, is to plug the water soaked cleaning ball into the air inlet washing joint first, then connect it to the top straight pipe connected with the reducer, and connect the safety cover at the end of the pipe, with the orifice of the safety cover facing down.

分析泵送电磁阀来电正常，就可以说明行驶、泵送方位查看应当正常，但是从头查看：I2.5点亮，分动箱方位查看靠近开关点亮，汽车行驶、泵送动作随驾驶室操作动作正常，说明行驶、泵送控制电路无缺点。发动机升速正常，而系统无压力，方位查看又无缺点，因此断定缺点为分动箱内部拨叉出现问题。正、反泵观察压力表，压力为0，系统无压力。查看DT1电磁阀来电正常，后手动顶其阀芯，缺点照常。

If the power of the pumping solenoid valve is normal, it can show that the driving and pumping direction should be normal, but from the beginning: i2.5 is on, the transfer case direction is on, the proximity switch is on, and the driving and pumping action of the car is normal with the cab operation, which shows that the driving and pumping control circuit has no defects. The engine speed up is normal, the system has no pressure, and the azimuth check has no defects. Therefore, it is concluded that the defect is the internal fork of the transfer case. Observe the pressure gauge of positive and negative pump, the pressure is 0, and there is no pressure in the system. Check dt1 solenoid valve power normal, after the manual top of its spool, shortcomings as usual.

整机水平放置时所容许的倾斜角为3o，更大的水平倾斜角会使布料的转向齿轮超载，并危及机器的稳定性。假设布料杆在移动时其间的某一个支腿或几个支腿早年离过地，就必须从头设定支腿，直至一切的支腿都能一向可靠的支撑在地面上。若终究一节布料杆能处于水平方位，对泵送来说是更理想的。假设这节布料杆的方位呈水平情况，那么混凝土的活动速度就会怠慢，然后可减少输送管道和结束软管的磨损，当泵送间断时，只需结束软管内的混凝土才会流出来。假设终究一节布料杆呈向下倾斜情况，那么在这有些输送管道内的混凝土就会在自重作用下加速活动，致使在泵送间断时输送管道内的混凝土还会继续流出。

When the whole machine is placed horizontally, the maximum allowable tilt angle is 3O. A larger horizontal tilt angle will overload the steering gear of the cloth and endanger the stability of the machine. Assuming that one or several legs of the boom leave the ground early when it is moving, it is necessary to set the legs from the beginning until all the legs can be reliably supported on the ground. If a section of distributing rod can be in horizontal position after all, it is the most ideal for pumping. Assuming that the position of the boom is horizontal, the movement speed of concrete will slow down, and then the abrasion of the delivery pipe and the end hose can be reduced. When the pumping is interrupted, only the concrete in the end hose will flow out. Assuming that after all a section of distributor is inclined downward, the concrete in some conveying pipes will accelerate under the action of self weight, so that the concrete in the conveying pipe will continue to flow out when the pumping is interrupted.