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The lubrication and rust prevention of crane hooks directly affect their flexibility, load-bearing capacity and service life. Lack of maintenance may lead to seizure, increased wear or sudden breakage. The following are detailed lubrication and rust prevention methods, cycles and precautions.

1. Lubrication management

1. Lubrication point identification

The main lubrication parts of the hook include:

• Swivel bearing/pin (to ensure free rotation of the hook)

• Threaded connection (nut and screw of removable hook)

• Pulley or pulley block (if equipped)

• Anti-unhooking device moving parts (springs, hinge points)

2. Lubricant selection

Common brands :

• Bearing lubrication : Shell Gadus S2, Mobilux EP 2

• Thread rust prevention : Loctite LB 8023 (with anti-seize agent)

3. Lubrication cycle

4. Lubrication operation steps

1. Cleaning : Use diesel or special cleaning agent to remove old grease and dirt.

2. Grease injection :

   • Bearings/pins: Use a grease gun to grease until new grease overflows.

   • Threads: Apply evenly, avoiding excess (to prevent dust absorption).

3. Manual rotation : Move the hook 3 to 5 times to ensure even distribution of lubrication.

2. Anti-rust treatment

1. Rust prevention methods

2. Anti-rust cycle

3. Rust removal and renovation

• Mild rust : Polish with a wire brush or sandpaper and then apply anti-rust oil.

• Severe rust :

  1. Sand blasting (Sa2.5 cleanliness level).

  2. Spray two-component epoxy paint (such as Interzone 954).

  3. It can be put into use after curing for 48 hours.

Note : Hooks with rust depth exceeding 5% of the original thickness must be scrapped!

3. Response to special working conditions

1. High temperature environment (such as metallurgical workshop)

• Lubrication options : composite calcium sulfonate grease (temperature resistant to 300°C).

• Anti-rust measures : Regularly remove oxide scale and spray high temperature resistant paint (such as Cerakote).

2. Marine salt spray environment

• Lubricant : Choose grease with salt spray protection (such as SKF LGHQ 2).

• Anti-rust combination :

  • Galvanizing layer + anti-corrosion coating + sacrificial anode.

  • Flush out salt residue with fresh water weekly.

3. Chemical corrosive environment

• Material upgrade : choose stainless steel hooks (such as 316L).

• Sealing design : Multi-layer sealing rings are installed to prevent acid mist from invading the bearing.

IV. Common Errors and Corrections

5. Maintenance records and monitoring

1. Establish lubrication files : record the time, location and grease type of each lubrication.

2. Intelligent monitoring (optional):

   • Install humidity sensors to monitor corrosive environments.

   • Use an automatic lubrication system with oil level detection.

Summarize

Key principles :

• Lubrication : Choose the right grease, perform regular maintenance, and prioritize cleaning.

• Rust prevention : environmental adaptation, multi-layer protection, and timely repair.

Maintenance tips :

• "Rotates flexibly without jamming, and has no rust or cracks on the surface"

• "High temperature and high humidity, special for chemical and marine use"

Through scientific lubrication and anti-rust management, the hook life can be extended by more than 30%, significantly reducing the risk of sudden failure!