Introduction: After the wheel loader machine 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 according to the technical characteristics of the loader in the early stage of use. Do you know what are the use and maintenance methods of the loader during the running-in period? Let's learn together below!
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. However, 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 loader use or because of tight construction period or want to get benefits as soon as possible. Some users even think that anyway, the manufacturer has a warranty period, and the manufacturer is responsible for repairing the machine if it breaks down. Therefore, the machine is overloaded for a long time during the period, resulting in frequent early failures of the machine, which not only affects the normal use of the machine and shortens the service life of the machine, but also affects the progress of the project due to machine damage. Therefore, the applicability and maintenance of the loader running-in period should be given full attention.
Characteristics of the running-in period
1. Fast wear rate
Due to the influence of factors such as the processing, assembly and adjustment of new machine parts, the friction surface is rough, the contact area of the mating surface is small, and the surface pressure is uneven. During the operation of the machine, the concave and convex parts of the surface of the parts are interlocked and rubbed against each other, and the metal debris that is worn off continues to participate in the friction as abrasives, which accelerates the wear of the mating surface of the parts. Therefore, it is easy to cause wear of parts (especially the mating surface) during the running-in period, and the wear rate is fast. At this time, if the operation is overloaded, it may cause damage to the parts and cause early failure.
2. Poor lubrication
Due to the small matching clearance of the newly assembled parts, and due to assembly and other reasons, it is difficult to ensure the uniformity of the matching clearance, and the lubricating oil (grease) is not easy to form a uniform oil film on the friction surface to prevent wear. This reduces the lubrication efficiency and causes early abnormal wear of the machine parts. In severe cases, it will cause scratches or bites on the friction surface of the precision match, leading to the occurrence of failures.
3. Looseness occurs
Newly processed and assembled parts have deviations in geometric shape and matching dimensions. In the early stage of use, due to the impact, vibration and other alternating loads, as well as the influence of heat, deformation and other factors, coupled with excessive wear and other reasons, the originally tightened parts are prone to loosening.
4. Leakage occurs
Due to the looseness of the parts, vibration and the influence of the machine's heat, the sealing surface of the machine and the pipe joints will leak. Some defects such as casting are difficult to find during assembly and debugging, but due to the vibration and impact during the operation, this defect is exposed and manifested as oil (water) leakage. Therefore, leakage is prone to occur during the running-in period.
5. Many operating errors
Due to insufficient understanding of the structure and performance of the machine (especially new operators), it is easy to cause failures due to operating errors, and even cause mechanical accidents.
Applicability and maintenance during the running-in period
1. Since construction machinery is a special vehicle, operators should receive training and guidance from the manufacturer, have a full understanding of the structure and performance of the machine, and obtain certain operating and maintenance experience before operating the machine. The "Product Use and Maintenance Manual" provided by the manufacturer is an essential document for operators to operate the equipment. Before operating the machine, be sure to read the "Use and Maintenance Manual" first and perform operation and maintenance as required.
2. Pay attention to the workload during the running-in period. Half of the workload during the running-in period should not exceed 60% of the rated workload, and arrange a suitable workload to prevent the occurrence of overheating caused by long-term continuous operation of the machine.
3. Pay attention to frequently observing the indications of each instrument. If an abnormality occurs, stop the machine in time to eliminate it. Stop the operation before the cause is found and the fault is not eliminated.
4. Pay attention to frequently checking the level and quality of lubricating oil, hydraulic oil, coolant, brake fluid, and fuel oil (water), and pay attention to checking the sealing of the whole machine. If the inspection finds that there is too much oil and water, the cause should be analyzed. At the same time, the lubrication of each lubrication point should be strengthened. It is recommended that grease should be added to the lubrication point every shift during the running-in period (except for special requirements).
5. Keep the machine clean, adjust and tighten loose parts in time to prevent loose parts from increasing wear or loss of parts.
6. After the running-in period, the machine should be maintained compulsorily, and inspection and adjustment should be done well, and attention should be paid to the replacement of oil.
In short, the requirements for the use and maintenance of the front wheel loaders during the running-in period can be summarized as: strengthen training, reduce load, pay attention to inspection, and strengthen lubrication. As long as you pay attention to and implement the maintenance and maintenance of the loader during the running-in period as required, you will reduce the occurrence of early failures, extend the service life, improve operating efficiency, and make the machine bring you more benefits.