[Product Details] The oil pump is not disassembled. Therefore, there is no specific maintenance method. When the product fails, it is an assembly replacement, but you should replace the two rubber seals of the plunger large and small. We will send the URL of service manuals that include the oil pump expansion, inspection, and adjustment. *If you are not confident that you can remove and send the oil seal large and small 1 each, gasket large and small 1 each, [car models] DT200R *Compatible with the pump in the image. Main unit not included.