| 摘要 |
PROBLEM TO BE SOLVED: To provide a lubricating oil composition for agricultural machineries that maintains an initial dynamic coefficient of friction over a long period of time, excels in wear resistance, and can suppress generation of an emulsion which may cause rust development and poor oil pressure, even when water is mixed into an oil tank. SOLUTION: This lubricating oil composition for agricultural machines includes a base oil for the lubricating oil, (A) 0.1-0.4 mass%, equivalent in zinc based on the total, of zinc dialkyldithiophosphate which is represented by the general formula (1), and has a 3-6C alkyl group (R<SP>1</SP>-R<SP>4</SP>), (B) 0.1-0.5 mass%, equivalent in calcium based on the total, of at least selected from among calcium sulfonate having a base number of≥150 mgKOH/g and calcium phenate having a base number of≥150 mgKOH/g; (C) 0.05-0.3 mass%, equivalent in calcium based on the total, of calcium sulfonate having a base number of≤50 mgKOH/g. COPYRIGHT: (C)2010,JPO&INPIT |
