After the loader leaves the factory, there is generally a running in period of about 60 hours (some refer to it as the running in period), which is determined based on the technical characteristics of the loader during its initial use. The running in period is an important link to ensure the normal operation of the loader, reduce the failure rate, and extend its service life. Some users neglect the special technical requirements for the new machine's running in period due to a lack of knowledge about using loaders, tight construction schedules, or the desire to obtain profits as soon as possible. Some users even believe that the manufacturer has a warranty period, and if the machine breaks down, the manufacturer is responsible for repairing it. As a result, the machine is overloaded for a long time during the running in period, leading to frequent early failures of the machine. This not only affects the normal use of the machine and shortens its lifespan, but also affects the progress of the project due to machine damage. Therefore, the application and maintenance of the running in period of loaders should be given sufficient attention.
Breakin period
1. The wear rate is fast. Due to factors such as processing, assembly, and adjustment of new machine components, the friction surface is rough, the contact area of the mating surface is small, and the surface pressure condition is uneven. During the operation of the machine, the concave and convex parts on the surface of the parts are interlocked and rubbed against each other, and the worn metal debris continues to participate in friction as abrasive, further accelerating the wear of the mating surface of the parts. Therefore, during the running in period, it is easy to cause wear on the components (especially the mating surface), and the wear rate is fast. At this point, if overloaded operation occurs, it may cause damage to the components and result in early failures.
2. Poor lubrication: Due to the small fitting clearance of newly assembled components, and due to assembly reasons, it is difficult to ensure the uniformity of the fitting clearance, and lubricating oil (grease) is not easy to form a uniform oil film on the friction surface to prevent wear. This reduces lubrication efficiency and causes early abnormal wear of the components. In severe cases, it can cause scratches on the friction surface of precision fitting or
The phenomenon of occlusion leads to the occurrence of faults.
3. Loose newly processed and assembled components may have deviations in geometric shape and fitting dimensions. In the early stages of use, due to alternating loads such as impact and vibration, as well as factors such as heat and deformation, coupled with rapid wear, it is easy for the previously fastened components to become loose.
4. Leakage occurs due to the loosening and vibration of the machine components, as well as the influence of heat on the machine. Leakage occurs on the sealing surface and pipe joints of the machine, and some defects such as casting and processing are difficult to detect during assembly and debugging. However, due to the vibration and impact during the operation, these defects are exposed, manifested as oil (water) leakage. Therefore, leakage is prone to occur during the running in period.
5. Due to insufficient understanding of the structure and performance of the machine (especially for new operators), operational errors can easily cause malfunctions and even mechanical accidents.
