The Complete Guide to Overhauling Bridge Cranes: Key Steps to Extend Equipment Lifespan

A major overhaul (i.e., a comprehensive inspection and repair) of a bridge crane is a complex task that typically includes the following:

1. Structural Inspection and Repair
   Main Girder and End Girder:

   Inspect the main girder and end girder of the bridge crane for deformation, cracks, corrosion, or other issues, and perform necessary repairs or replacements.

   Rails and Trolley:

   Inspect the bridge crane’s rails for wear or deformation, and adjust or replace worn trolley wheels.

   Connecting Components:

   Inspect the crane’s connecting components, such as bolts and welds, to ensure they are securely fastened and reliable; repair any cracked or loose parts.

2. Maintenance of Mechanical Components
   Hoisting Mechanism:

   Inspect the crane’s drum, wire rope, pulleys, and other components for wear or deterioration, and replace them as necessary.

   Drive System:

   Inspect drive components such as gears, bearings, and couplings for wear, and lubricate or replace any damaged parts.

   Braking System:

   Check whether the brakes are functioning properly and whether the brake linings or brake shoes need to be adjusted or replaced.

3. Electrical System Maintenance
   Motors and Control Systems:

   Inspect motors, contactors, controllers, and other components for faults or signs of wear and tear, and repair or replace any faulty electrical components.

   Cables and Wires:

   Inspect cables and wires for wear or aging to ensure the safety and reliability of the electrical system.

   Safety Switches and Limit Switches:

   Inspect safety devices such as limit switches and emergency stop buttons to ensure they are functioning properly.

4. Hydraulic and Lubrication Systems
   Hydraulic System:

   Inspect the hydraulic cylinders, oil pumps, valves, and other components of the hydraulic system for oil leaks or insufficient pressure, and repair or replace them as necessary.

   Lubrication System:

   Thoroughly lubricate all moving parts, check whether the lubricant has deteriorated, and replace it promptly.

5. Safety Performance Testing
   Load Testing:

   Conduct rated load and overload tests on the crane to ensure it can operate normally and remain stable under maximum loads.

   Safety Inspection:

   Conduct a comprehensive inspection of all safety devices on the crane to ensure they function effectively in emergency situations.

6. Corrosion Protection and Painting
   Corrosion Protection:

   Inspect the crane’s surface for rust or peeling paint, and perform the necessary sanding and application of anti-corrosion paint.