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A certain machine starts smoothly, but accelerates powerlessness. After checking, smoke exhaust is normal at idle speed, and engine jitter is strong when accelerating. Because of the smooth start, the timing of injection and the quality of atomization are excluded. It is determined that the oil can not be supplied when accelerating. Remove the oil spout screw of the rotor pump, and there is no air in the oil pump. Remove the rotor pump and check the oil return again. It is found that the amount of oil returned is very small. After inspection, the oil filter screw screen is blocked. Everything is normal after the replacement.