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Komatsu Oil Cooler Guide: PC200, PC300 & D65 Models

A machine that loses power in the heat of the day, feels sluggish on the hydraulics, or shows a slow creep on the temperature gauge isn't always a radiator problem. Very often, it's the oil cooler, the quieter, less-talked-about half of the cooling pack that keeps engine oil and hydraulic oil at a safe working temperature. This guide covers how Komatsu oil coolers are identified across the PC200, PC300 and D65 ranges, common part numbers, and how to tell an oil cooler fault from a radiator fault before you order the wrong part.