Logging harvester reliability assessment

The article calculates the reliability parameters of the logging felling-knot-cutting-bucking machine (harvester). Individual elements were evaluated in the car. The operation of the Ponsse-ERGO harvester was carried out on the territory of the Krasnoyarsk Territory. The duration of observations was 10 500 hours. During this time, each node revealed a certain number of failures and the average recovery time after node failure. Based on the results of the calculations, a probability diagram of the harvester system states and a Pareto diagram (accumulated probability of system failures) are constructed. According to calculations, it was determined that the greatest probability of failures falls on the hydraulic system of the transmission and hydraulic manipulator. These elements of the machine account for the main load during its operation. A detailed analysis of the reasons for the failure of a logging machine during its operation is presented. It was revealed that the main reasons for the failure of the hydraulic system are: violation of the tightness of the connection pipelines, increased wear of the moving elements of the assembly, contamination of the hydraulic fluid, not always satisfactory work of the service personnel. Also, the most common reason for stopping the harvester during operation is the failure of the saw headset. An increase in the harvester’s performance and durability can be achieved by optimizing the operating conditions of the logging machine, and optimally selected design material that has higher technical characteristics that strengthen the part itself and the wear surface.