In the maintenance and maintenance of the Cat excavator, it is essential to know the reasonable amount of fuel used by each department.First, we start with the main component, the engine, and the engines of the CatC series excavators are generally recommended for replacement with about 20-30 litres of specialized oil, which may vary depending on the type.The transmission system component, including main pumps, motors, etc., usually has a refueling cycle of 500 hours, requiring approximately 160-240 litres of hydraulic fluid.In addition, re-entry agencies and other key locations, such as walking motors, need to refer to the equipment manual to ensure proper filling and avoid over- or under-supply.For lubricating the track chain, each maintenance is covered with an appropriate amount of lubricant to ensure its good functioning.At the same time, let's not forget small components such as handles and pole bearings, which require a small amount of lubricant, but also cannot be ignored.In summary, with regard to the amount of fuel used by the various parts of the Cat excavator, users are advised to follow strictly the guidance provided in the Maintenance Manual by the equipment manufacturer, which ensures both efficient and stable operation of the excavator and effective extension of the machine's useful life.Keywords: Cat excavator, various parts, quantity of oil, engine oil, hydraulic fluids, lubricant, tracked chain, description of maintenance manual: this document details the reasonable amount of oil used in each of the Cat excavator's parts, covers standards for the use of various types of oil, such as engine oil, hydraulic fluids, lubricants, etc., and stresses the importance of following the Maintenance Manual to provide users with a scientific and practical oil reference guide for excavators.