When sourcing used equipment, you must prioritize mechanical integrity and processing capacity. Key specs include the throughput rate (tons per hour), recovery rate percentage, and power source compatibility (diesel vs. electric). For crushers, check the maximum feed size and discharge granularity. For trommels and wash plants, inspect the mesh integrity and water consumption requirements. Always request the original equipment manufacturer (OEM) manual and a detailed maintenance log to verify the remaining service life of wear parts like liners, screens, and belts.