The maintenance of an aluminum alloy hand chain hoist must take into account the material characteristics and mechanical structure features. Daily maintenance (after each use) includes: 1. Cleaning and removing dirt: Use a soft brush to remove surface aluminum shavings and dust, and wipe with a lint-free cloth. Pay special attention to cleaning impurities in the chain joint gaps and gear meshing areas. 2. Transmission system inspection: Manual no-load test: Observe if there are any abnormal vibrations in the gear set (axial clearance should be <0.3mm). Check the wear condition of the brake ratchet (replace it if the tooth tip wear exceeds 1/3).