Transport and material handling is a sum of technological processes in the wood-processing industry. Hydraulic drives are one of the drive options used as a basic part of the transport – handling machines. Contamination control involves preventing contaminants from entering a hydraulic system and placing filters in strategic locations throughout the system to trap any contaminants to find their way into the fluid. But for critical equipment, a successful contamination control program must also include regular assessment of the hydraulic fluid cleanliness. It must be often done every two to six months or after every 500 or 1,000 hours of operation, depending on the equipment duty cycle, operating environment, and how critical it is to overall operation. Pressure forces in hydraulic drives are transferred to hydraulically-operated devices which also serve to lubricate the elements, displace and remove heat from the system. To increase the service life of hydraulic drives, hydraulic oil must meet individual physical characteristics. To ensure reliability, timely diagnosis of hydraulic oil is required. Some experts also recommend that fluid to be tested immediately after any maintenance event that exposes the hydraulic system to the external environment. This could occur when a hose or other component is replaced or fluid is added to the reservoir. Fluid replenishment can be particularly troublesome because new fluid is notorious for being dirty – often from improper storage and handling practices. The article deals with the methodology of measuring the basic physical properties of hydraulic oil by the respective diagnostic devices directly on the hydraulic drive of the bend saw in the full operation of the machine. The methodology suggested enables making decisions for improvement of the hydraulic oil state.
Forestry in Slovakia has recently got very fast tendency of research in all levels. The introduction of complex machines and equipment, the application of new advanced technologies, the tendency to decrease energy consumption, material difficulty of products, requirements on high reliability of machines and automation in operation impose the necessity for the search of theoretical basics for wood production processes and utilization of new developing forest and wood processing techniques. The work with a chain saw is risky and has negative impact on the health of workers. It has been clear from recent findings. The limitation of these impacts has influence on technical, technological and organizational actions serving as preventive ones. That is the reason why the famous chain saw producers established different technical supports which have the influence on decrease of vibrations and noise. It is necessary to realize several actions within the maintenance of chain saws to fulfil the goals of a technical action. The paper deals with risk analysis by usage Failure Modes and Effects Analysis (FMEA), which was implemented on STIHL motor chainsaw. We identified the potential failures, then we allocated to the value of occurrence, significance and detectability in the process and we also calculated the risk priority number (RPN). Application of the FMEA method allows flexibility in the case of unexpected situations and optimization of human potential abilities. FMEA is a tool preventing outages operational reliability and preventive tool for ensuring the maintenance of facilities. There are several methods of information processing regarding to reliability parameters, but some of them are very difficult and in standard operational conditions are not usable. The method of information analysis mentioned below is simple but precise enough for implementation in real working conditions.
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