A well-performingtruck-mounted crane comprises a robust and reliable chassis as well as a stable upper structure. Among the components of the upper structure of the truck-mounted crane, the crane is of paramount importance. Today, let’s focus on the crucial maintenance aspects of an essential part of the crane, namely the slewing mechanism.
Inspection of the bolts of the slewing bearing
Prior to each operation of the truck-mounted crane, it is essential to verify whether the fastening bolts of the slewing mechanism are securely tightened. This pre-operation inspection is a vital step to ensure the stability and safety of the slewing mechanism during operation. Any loose bolts can potentially lead to mechanical failures and pose significant risks.
For a newly acquired truck-mounted crane, after the initial 100 hours of operation, a detailed inspection of the bolt fastening condition should be conducted. If the working environment is particularly harsh or demanding, it is advisable to shorten the inspection interval. Swift action should be taken to tighten any loose bolts promptly to prevent potential problems.
Before installing the slewing bearing, it is necessary to ensure that it is filled with lithium-based grease. This helps in reducing friction, minimizing wear, and prolonging the lifespan of the bearing.
When replacing the bolts, meticulous cleaning of the bolts is crucial. Applying thread locking adhesive after cleaning enhances the bolt’s fastening ability and reduces the risk of loosening due to vibrations and mechanical stresses during operation.
Routine inspection of the slewing bearing
Regular checks should be carried out to assess its flexibility. Any audible noise or shock during operation should be a cause for immediate concern. Promptly halting the machine and conducting a detailed inspection is necessary to identify and rectify the source of the problem.
At regular intervals, inspect the slewing gear ring for cracks or damages. Also, keep a lookout for any signs such as meshing tooth surface biting, gnawing, or tooth surface peeling. These issues can significantly affect the performance and longevity of the slewing mechanism and, if left unaddressed, can lead to more severe mechanical failures.
The integrity of the seal should be inspected on a regular basis. A damaged seal belt can compromise the protection of internal components from dirt, debris, and moisture. If damage is detected, it should be replaced promptly. Similarly, if the seal is found to be dislodged, it should be reset immediately to maintain its proper sealing function.
Lubrication and maintenance of the tooth surface of the slewing bearing
The tooth ring of the slewing bearing is coated with anti-rust oil before leaving the factory. Typically, the validity period of this anti-rust oil ranges from 3 to 6 months. Once this period expires, it is imperative to apply fresh anti-rust oil in a timely manner to prevent rust and corrosion. Additionally, during the crane’s operational life, efforts should be made to prevent the slewing bearing from direct exposure to sunlight, as excessive heat can adversely affect the performance and lifespan of the bearing. Moreover, direct flushing of the slewing bearing with water should be strictly avoided to prevent water from infiltrating the raceway and causing damage. Constant vigilance is necessary to prevent hard foreign objects from approaching or entering the tooth meshing area, as this can cause significant damage and disrupt the smooth operation of the slewing mechanism.
The raceway of the slewing bearing also demands proper lubrication
Depending on the working environment, the raceway requires regular filling with lubricating grease. After the first 50 working hours, the raceway should be filled with lubricating grease to ensure smooth operation and reduce friction. Subsequently, following the instructions provided in the manual, regular injections of lubricating grease should be carried out. Before and after long-term storage, it is essential to fill the slewing bearing with grease. The grease should be injected while the slewing bearing rotates slowly to ensure even distribution. The injection is complete when the lubricating grease overflows from the seal, as this forms a protective film that enhances the sealing effect.
Have you all thoroughly understood and mastered the maintenance points of the slewing mechanism of the truck-mounted crane?
Proper and regular maintenance of the slewing mechanism is not only crucial for the efficient and safe operation of the truck-mounted crane but also plays a significant role in extending the equipment’s lifespan and reducing the likelihood of breakdowns. By adhering to these maintenance guidelines and conducting thorough inspections and lubrication procedures, operators can ensure the reliable performance of the slewing mechanism and the overall functionality of the truck-mounted crane.
In conclusion, a commitment to maintaining the slewing mechanism in top condition through consistent and diligent care is an investment that pays off in terms of enhanced operational safety, reduced downtime, and prolonged equipment durability.
