Running in is also called running in. The running in period of concrete mixer truck refers to the initial driving stage after a new car or overhaul, which is generally 1000 ~ 1500 km, which is the basic mileage to ensure full contact, friction, adaptation and finalization of the machine parts. During this period, the ability of each part of the concrete mixer truck to adapt to the environment can be adjusted and improved, and the bumps on the parts can be grinded off. The running in quality of concrete mixer truck will have an important impact on its life, safety and economy.

出厂后的新搅拌车，虽然已经进行过磨合，但是零件的表面依然较粗糙。另外在加工、装配时存在一定的偏差和一些很难发现的隐患。另外，新零件与配件间，有很多金属粒脱落，这些金属粒不仅使零件间的磨损加剧，而且落入机油后还会使机油的质量下降，影响了润滑的效果。由于新的零件在运行时摩擦阻力比正常时期大，所以油耗也会比较高。

Although the new mixer truck has been run in, the surface of the parts is still rough. In addition, there are some deviations and hidden dangers in the process of processing and assembly. In addition, a lot of metal particles fall off between new parts and accessories. These metal particles not only aggravate the wear between parts, but also reduce the quality of engine oil after falling into the engine oil, which affects the lubrication effect. Because the friction resistance of the new parts is larger than that in normal period, the fuel consumption will also be higher.

1、磨合过程：自上料混凝土搅拌罐车的磨合里程为1000－2500公里，进口车的磨合期则更长一些，多数为1500－3000公里。磨合期分为三个阶段。行驶里程至100公里时为磨合初期，200公里时为初磨合程度，3000公里就可磨合形成氧化膜。

1. Running in process: the running in mileage of concrete mixer truck is 1000-2500 km, while that of imported truck is longer, mostly 1500-3000 km. The running in period is divided into three stages. When the mileage reaches 100 km, it is the initial running in period, 200 km is the initial running in degree, and the running in can form oxide film at 3000 km.

2、行驶速度：磨合期内应尽量低速行驶。一般情况下，载重自上料混凝土搅拌罐车车速不宜超过45公里/小时，自上料混凝土搅拌罐车的车速应在50－80公里/小时以内。同时，在起步前不要让发动机怠速运转太长时间，30秒左右即可起步。初驶期300公里以内应避免紧急制动。

2. Driving speed: drive at a low speed as far as possible during the running in period. In general, the maximum speed of truck mixer should not exceed 45 km / h, and the maximum speed of truck mixer should be within 50-80 km / h. At the same time, do not let the engine idle for too long time before starting, and start in about 30 seconds. Emergency braking should be avoided within 300 km of the initial driving period.

新购搅拌车磨合期内的驾驶规定

Driving regulations of newly purchased mixer during running in period

1、新购搅拌车保持起步平稳，避免猛踩油门，且不要使发动机转速过高。

1. The newly purchased mixer should keep a smooth start, avoid stepping on the accelerator and don't make the engine speed too high.

2、新购搅拌车起步前，水温应达到50℃以上。以低挡起步，1公里以后换入高挡，行车中水温应控制在80℃－90℃。

2. Before starting the new mixer, the water temperature should be above 50 ℃. Start at low gear and shift to high gear 1 km later. The water temperature should be controlled between 80 ℃ and 90 ℃.

3、新购搅拌车行进中及时换挡，不要长时间使用一个挡位，也不能使用高速挡低速行驶或使用低速挡高速行驶。

3. When the new mixer truck is moving, shift gears in time. Do not use a gear for a long time, nor use high gear to drive at low speed or use low gear to drive at high speed.

4、新购搅拌车选择良好路面，避免过大振动、冲撞或紧急制动。制动前，应先分离合器。

4. New purchase mixer choose good road surface to avoid excessive vibration, collision or emergency braking. Before braking, the clutch should be disengaged.

5、新购搅拌车选用优质的燃油及机油，不宜使用发动机耐磨添加剂。

5. High quality fuel and engine oil should be selected for the newly purchased mixer, and the engine wear-resistant additive should not be used.

6、新购搅拌车不要盲目拉高速，“新车就像一个新生婴儿，在磨合期内要轻加速、轻加油，避免急加油、急加速，还要避免过高的负荷。”现在的汽车制造工艺非常精细，一些搅拌车友所说的新车拉高速，特别是极速行驶，完全没有必要。可以将新车开到高速公路上匀速行驶一段时间，时速更好保持在90-100公里，行驶百公里甚至数百公里，这样有利于发动机各部件得到较充分磨合，但不能极速行驶，那样只会损坏发动机。

6. Don't blindly speed up the new mixer. "The new car is just like a newborn baby. During the running in period, you should accelerate and refuel gently, avoid rush refueling and acceleration, and avoid excessive load." Now the automobile manufacturing process is very fine. It is unnecessary for some agitators to drive new cars at high speed, especially at extremely high speed. The new car can be driven on the highway at a constant speed for a period of time. It is best to keep the speed at 90-100 km / h and drive for 100 km / h or even hundreds of km / h. This is conducive to the full running in of various parts of the engine, but it can not be driven at extreme speed, which will only damage the engine.

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