Jib cranes are special-purpose equipment subject to high-frequency operation; prolonged use often leads to issues such as component wear, loose bolts, lubrication failure, and wiring degradation. Standardized daily maintenance effectively extends equipment service life, reduces failure rates, ensures operational safety, and enhances operational efficiency. Based on industry standards for operation and maintenance, as well as the structural characteristics and wear patterns of jib cranes, a tiered maintenance protocol and a long-term maintenance strategy have been established.
Daily pre-shift maintenance forms the core of routine upkeep and must be performed before operations begin. Operators must inspect the equipment's external structure, checking the mast, jib arm, and brackets for deformation, cracks, or corrosion, and ensuring that connecting bolts are secure and free from looseness or missing parts. The condition of the electric hoist's wire rope or chain must be checked to ensure there are no broken strands or links, excessive wear, or corrosion/dryness, and that the hook's safety latch is intact and functional. The electrical system requires testing: insulation on power and control cables must be intact, switches and buttons must operate responsively, and indicator lights must function normally. A no-load test run is required to assess the smoothness of the jib rotation and hoist lifting/lowering, checking for abnormal noises, sticking, or brake failure; operations may only proceed once the equipment is confirmed to be in proper working order. After operations conclude, dust and debris must be cleared from the equipment surfaces, the power supply disconnected, and dust protection measures applied.
Weekly specialized maintenance focuses on the drive and lubrication systems, playing a critical role in minimizing component wear. Key drive components—such as slewing bearings, reduction gears, hoist travel wheels, and guide rails—must be lubricated with specialized grease to prevent wear caused by dryness, as well as issues like abnormal noise or sticking; lubricant selection must align with operating conditions, with food-grade, dust-free grease used for equipment in clean environments. The lubricant level in the slewing drive reducer must be checked and topped up as necessary, with degraded oil replaced promptly. Debris and oil residue must be cleared from the main beam rail surfaces to ensure smooth hoist travel; rail wear must be inspected, with burrs ground down and worn areas repaired in a timely manner. Tighten all connecting bolts, paying special attention to reinforcing the column anchor bolts and cantilever connection bolts to eliminate any risk of loosening.
Conduct monthly in-depth maintenance involving comprehensive inspections of core components and safety systems. Dismantle and inspect the electric hoist's braking mechanism, motor, and gear transmission parts to identify internal wear or aging, and promptly replace any components showing excessive wear. Thoroughly verify safety protection devices; ensure that travel limiters, overload protection systems, and emergency stop buttons are 100% responsive and reliable, replacing any malfunctioning units immediately. Inspect electrical wiring insulation and terminal connections to eliminate hazards such as aging wiring, short circuits, or current leakage. Treat rusted areas by removing rust and applying anti-corrosion paint to enhance the equipment's corrosion resistance. Additionally, establish maintenance logs to record service dates, tasks performed, and equipment status, thereby creating a long-term maintenance system and ensuring standardized management throughout the equipment's entire lifecycle.
