Examine the structural steel grade used in the boom and chassis; high-tensile steel provides better fatigue resistance. Ask for the brand of core components, such as Kawasaki pumps, Cummins engines, or ZF transmissions, as these have global service networks. Evaluate the centralized lubrication system—units with easy-access grease points reduce downtime. A professional supplier should provide a detailed maintenance schedule and a wear-parts list (filters, teeth, seals) for the first 2,000 hours of operation.