Due to the absence of the standard with regard to the guide for operationand maintenance of gear oil to evaluate the gearbox performance, guide based on researchon the performance of gear oil combined with domestic and international standards foroperation and maintenance of gear oil in power plant was drafted. Therefore, the conditionof gear may effectively be evaluated by monitoring physical and chemical characteristics oflubricating oil, wear elements and oil cleanliness. And meanwhile the guide may provi...