5-2 Lower Mechanism: Travel Drive Unit Replacement timing for the reduction gear lubricating oil Reduction gear lubricating oil deteriorates over time as it is used and as metal powder enters it due to the wear of the gear and sliding sections. Therefore, periodically replace the reduction gear lubricating oil according to the numerical indication shown in Table 20. Table 20. Replacement Timing for the Reduction Gear Lubricating Oil Initial replacement Second time replacement
Replacement Timing 100 - 250 hours 1000 - 1500 hours
When replacing the lubricating oil, be careful not to leave the deteriorated oil or metal powder in the reduction gear. They can be contaminants to the new oil. Therefore, before replacing the lubricating oil, thoroughly flush the inside of the reduction gear to remove the residual oil and metal powder. Routine inspection of the reduction gear lubricating oil The degree of the deterioration of the reduction gear lubricating oil also depends on the operation environment and the operation frequency. Therefore, regularly inspect the lubricating oil in addition to the replacement described above. As a way of performing a routine inspection, it is recommended to ask the lubricating oil manufacturer or an analysis company to analyze the used lubricating oil and comprehensively judge from the measured results of viscosity, total oxidation, iron, etc. Table 21. Replacement Indication from the Results of Analysis viscosity Change % ±15
Total Oxidation >2.0
Heptane Insoluble Matter >0.5
Iron % >0.1
4. Routine inspection of the motor Using the motor for a long period of time will cause parts to wear and may result in performance degradation or failure. Keep logs about the routine inspection of the hydraulic oil and the reduction gear lubricating oil. If the property values of the oil indicate abnormal rise in the amount of foreign matter or if there is unusual foreign matter, disassemble and inspect the motor. In addition, disassemble and inspect the motor when the running time of it reaches 1000 hours or the number of start and stop times reaches 300000. Follow the maintenance procedures when disassembling and inspecting the motor. In particular, refer to the descriptions about wear of the parts including the parking brake disk in the maintenance procedures to replace the parts. The parking brake disk should be replaced when the number of action times reaches 300000. Disassembly and inspection of the motor Follow the maintenance procedures when disassembling and inspecting the motor. Follow the maintenance standards described in the maintenance procedures when inspecting the motor during disassembly. Be sure to replace the seals when disassembling the motor. Important
Follow the instructions for the machine main unit when removing the motor from the machine. Remove the pipes after stopping the operation of the hydraulic device and release the air pressure in the tank to make the pressure equal to the atmospheric pressure.
152
