After the crane leaves the factory, it is generally stipulated that there is a running-in period of about 60 hours (some are called the running-in period), which is stipulated by the manufacturing factory according to the technical characteristics of the crane in the early stage of use. The running-in period is an important link to ensure the normal operation of the crane, reduce the failure rate and prolong its service life. But at present, some users ignore the special technical requirements of the running-in period of the new machine due to lack of common sense of crane use, tight construction period, or wanting to obtain benefits as soon as possible. Some users even think that the manufacturer has a warranty period anyway, and the manufacturer is responsible for the maintenance if the machine is broken, so the machine is overloaded for a long time during the break-in period, resulting in frequent early failures of the machine, which not only affects the normal use of the machine, The service life of the machine is shortened, and the progress of the project is also affected due to the damage of the machine. Therefore, the use and maintenance of the crane's running-in period should be fully paid attention to.

First, the characteristics of the running-in period:

1. Fast wear and tear

Due to the influence of factors such as processing, assembly and adjustment of new machine parts, the friction surface is rough, the contact area of ​​the mating surface is small, and the pressure bearing condition of the surface is uneven. During the operation of the machine, the concave and convex parts on the surface of the parts fit into each other and rub against each other, and the metal chips that fall off, as abrasives, continue to participate in the friction, which accelerates the wear of the mating surfaces of the parts. Therefore, it is easy to cause wear of parts (especially the mating surfaces) during the running-in period, and the wear rate is fast. At this time, if overloaded, it may cause damage to components and cause early failure.

2. Poor lubrication

Since the fitting clearance of the newly assembled parts is small, and due to assembly and other reasons, it is difficult to ensure the uniformity of the fitting clearance, and the lubricating oil (grease) is not easy to form a uniform oil film on the friction surface to prevent wear. As a result, the lubrication efficiency is reduced and the early abnormal wear of the parts is caused. In severe cases, the friction surface of the precision fit will be scratched or occluded, resulting in failure.

3. Loosening occurs

The newly machined and assembled parts have deviations in geometric shape and matching size. In the early stage of use, due to alternating loads such as shock and vibration, as well as the influence of factors such as heat and deformation, as well as excessive wear and other reasons, it is easy to cause damage. The previously tightened parts were loosened.

4. Leakage occurs

Due to the loosening of parts, vibration and the influence of machine heat, leakage will occur on the sealing surface of the machine and pipe joints; some casting, machining and other defects are difficult to find during assembly and debugging, but due to vibration during operation , impact, this defect is exposed, manifested as leakage (seepage) oil (water). Therefore, leakage is prone to occur during the running-in period.

5. There are many mistakes in operation

Due to insufficient understanding of the structure and performance of the machine (especially new operators), it is easy to cause failures due to operational errors, and even cause mechanical accidents.

Second, the use and maintenance of the running-in period

1. Since the crane is a special vehicle, the operator should accept the training and guidance of the manufacturer, have a full understanding of the structure and performance of the machine, and obtain certain operation and maintenance experience before operating the machine. The product maintenance manual provided by the manufacturer is the necessary information for the operator to operate the equipment. Before operating the machine, be sure to read the maintenance manual first, and operate and maintain according to the requirements of the manual.

2. Pay attention to the workload during the running-in period. Generally, the workload during the running-in period should not exceed 80% of the rated workload, and a suitable workload should be arranged to prevent the occurrence of overheating caused by the continuous operation of the machine for a long time.

3. Pay attention to frequently observe the indications of various instruments. If there is any abnormality, stop the machine in time to eliminate it. If the cause is not found and the fault is not eliminated, the operation should be stopped.

4. Pay attention to frequently check the level and quality of lubricating oil, hydraulic oil, coolant, brake fluid and fuel oil (water), and pay attention to check the sealing of the whole machine. During the inspection, it is found that there is too much oil and water shortage, and the reason should be analyzed. At the same time, the lubrication of each lubrication point should be strengthened. It is recommended that during the running-in period, grease should be added to the lubrication point in each shift (except for special requirements).

5. Keep the machine clean, adjust and fasten loose parts in time to prevent the parts from being worn out or lost due to loosening.

6. At the end of the running-in period, the machine should be compulsorily maintained, checked and adjusted, and at the same time, pay attention to the replacement of oil.

In short, the requirements for the use and maintenance of cranes during the running-in period can be summarized as: strengthening training, reducing load, paying attention to inspection, and strengthening lubrication. As long as you pay attention to and implement the maintenance and maintenance of the crane during the break-in period as required, the occurrence of early failures will be reduced, the service life will be prolonged, the operation efficiency will be improved, and the machine will bring you more benefits.