After using the small concrete mixer for a period of time, it is necessary to change the hydraulic oil. Due to the damage of the oil pump, the hydraulic oil enters the water and is polluted. Here is the method of changing the hydraulic oil.

　　1. 放油前准备

　　1. Preparation before oil discharge

　　小型混凝土搅拌车均开发各腿油缸，包括摆动、拉伸(一定范围内的延伸和缩进隐喻)、立式油缸等。由于场地、老化等因素的限制，臂架油缸仅展开(完全展开)，其余的臂架油缸均收缩到位。活塞杆检查:检查泵缸活塞杆是否有应变迹象，如有，更换;检查油箱内各油口连接处是否有漏油、开裂等现象。

　　Small concrete mixers have developed various leg oil tanks, including swing, stretching (metaphor of extension and retraction in a certain range), vertical oil tanks, etc. Due to the limitation of site, aging and other factors, the boom cylinder only expands (fully expands), and the rest of the boom cylinder shrinks in place. Piston rod inspection: check whether the piston rod of pump cylinder has strain signs, if any, replace it; check whether there is oil leakage, cracking and other phenomena at the connection of oil ports in the oil tank.

　　2、排油工作

　　2. Oil discharge work

　　将小型混凝土搅拌车泵缸内的液压油取出，将混凝土活塞和泵缸连杆自由或连杆阀块取出;关闭球阀(应用领域:食品、化工、石油、电力等)，在闭式系统和开式系统中进行排油，油缸桶腔内的油和油箱内的液压油。

　　Take out the hydraulic oil in the pump cylinder of the small concrete mixer, take out the concrete piston and the connecting rod of the pump cylinder freely or the connecting rod valve block; close the ball valve (application field: food, chemical industry, petroleum, electric power, etc.), drain the oil in the closed system and the open system, and remove the oil in the tank cavity and the hydraulic oil in the tank.

　　3、小泵清洗油箱，取下油箱底部防水隔板，用柴油或煤油清洗液压油箱，用海绵吸出多余的油，然后用面团将参与油箱的杂质粘干净。小型混凝土泵由泵体和输送管道组成。它是一种利用压力沿管道连续输送混凝土的机械，主要用于房屋、桥梁、隧道的施工。主要分为闸阀式混凝土输送泵和S阀式混凝土输送泵。另一种是把泵体安装在汽车的底盘上，然后装上可伸缩或可弯曲的布棒，再装上泵车。

　　3. Clean the oil tank with a small pump, remove the waterproof partition at the bottom of the oil tank, clean the hydraulic oil tank with diesel or kerosene, suck out the excess oil with a sponge, and then stick the impurities in the oil tank with dough. Small concrete pump is composed of pump body and conveying pipeline. It is a kind of machinery that uses pressure to continuously transport concrete along the pipeline, mainly used for the construction of houses, bridges and tunnels. It is mainly divided into gate valve concrete delivery pump and S valve concrete delivery pump. The other is to install the pump body on the chassis of the car, then install the retractable or bendable cloth bar, and then install the pump car.

　　4、对各部件进行清洗，液压阀、阀块、水箱防水挡板、过滤壳、多路阀清洗。二级结构泵采用螺旋式输送泥浆,振动筛过滤双缸往复操作是完全能够运输各种砂浆、细石混凝土在建筑应用中,等,二级结构列铸造机大位移的特点,高压力,减少劳动力和材料,灵活的运动等等。耐磨合金材料，使用寿命长，出口压力高，能满足高层浇筑和长距离施工运输的要求，液压系统采用双回路开式系统，换向速度快，效率高

　　4. Clean all parts, hydraulic valve, valve block, waterproof baffle of water tank, filter shell and multi way valve. The secondary structure pump adopts the screw type to transport the mud. The double cylinder reciprocating operation of vibrating screen filtration is fully capable of transporting all kinds of mortar and fine aggregate concrete in the building application, etc. the characteristics of large displacement of the secondary structure train casting machine, high pressure, reducing labor and materials, flexible movement, etc. Wear resistant alloy material, with long service life and high outlet pressure, can meet the requirements of high-rise pouring and long-distance construction and transportation. The hydraulic system adopts double circuit open system, with fast reversing speed and high efficiency

　　5. 注液压油

　　5. Inject hydraulic oil

　　6、泵送、搅拌液压系统放油

　　6. Oil discharge of pumping and mixing hydraulic system

　　7. 配电系统放油

　　7. Oil discharge of power distribution system

　　8. 排水管道的排油。为了保证油箱内油的顺利冲洗，拆下的排油管连接低于油箱液位。

　　8. Drain oil from drain pipe. In order to ensure the smooth flushing of the oil in the tank, the removed oil drain pipe connection is lower than the tank level.

　　9、小型混凝土搅拌车泵车吊臂泵车液压系统排油。由于大臂油缸在放油前进行了伸长，其他油缸在放油前进行了收缩，所以所有臂油缸只有一个腔内充油。另一室小，可忽略，因为油缸的延伸和收缩。例如:大臂油缸在出油前进行了适当的延伸，所以在出油时只需要考虑排除大臂油缸无杆腔内的油即可。

　　9. The hydraulic system of the boom pump truck of the small concrete mixer truck discharges oil. Since the boom cylinder has been extended before oil discharge and other cylinders have been contracted before oil discharge, all boom cylinders have only one cavity for oil filling. The other chamber is small and can be ignored because of the extension and contraction of the cylinder. For example, the boom cylinder has been properly extended before the oil is discharged, so only the oil in the cavity without rod of the boom cylinder needs to be removed when the oil is discharged.

　　10、腿系统排水。断开油箱与油箱管道之间的支腿多路阀端口T，堵塞油箱接头。T口的管道连接到油桶上。

　　10. Leg system drainage. Disconnect the leg multi way valve port t between the oil tank and the oil tank pipe, and block the oil tank joint. The pipe of port t is connected to the oil drum.

　　以上是小型混凝土搅拌机更换液压油的步骤，用户可以参考以上方法进行换油工作，保证液压油的使用，提高搅拌机的效率。

　　The above steps are for replacing hydraulic oil of small concrete mixer. Users can refer to the above methods for oil replacement to ensure the use of hydraulic oil and improve the efficiency of mixer.