Remanufacturing is an effective way to achieve circular economy and sustainable development. Hydraulic cylinder is one of the most important executive parts of construction machinery, which has high quality, high precision and high economic value. In order to evaluate the recycling quality of hydraulic cylinder under unknown load history conditions, a remanufacturability evaluation method based on residual strength and residual life analysis was presented in this paper. Design strength, surface quality, mechanical properties including hardness, stiffness and natural frequency of hydraulic cylinder were taken into account in this model. Based on the strength characteristics change rules of hydraulic cylinder in the fatigue process, a reasonable critical threshold for remanufacturing was given. The results showed that, this model provided an intuitive way to learn about the residual strength and residual life of parts, which has a high application potential.
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