The break-in period of new construction machinery is the key stage for internal precision parts fitting and performance shaping, which directly affects long-term operation status. Many overseas users run new machines at full load to speed up construction progress, ignoring standard break-in maintenance rules. New internal parts are not fully fitted, with tiny burrs on metal contact surfaces. Overloaded operation causes irreversible accelerated wear, leading to insufficient power, hydraulic jamming and loose parts in later use, greatly shortening service life. Abiding by low-load operation, regular oil replacement and fastening re-inspection rules optimizes equipment performance, reduces failure rates and lays a foundation for long-term stable operation.