During daily maintenance of polyurethane casters, what should we pay attention to?

Maintenance of polyurethane casters should be based on the material properties (such as being less resistant to strong corrosion and softening easily at high temperatures) and structural features (such as sealed bearings and the tread being susceptible to debris). Through effective maintenance, the service life of the wheels can be extended by 2-3 times. Specific precautions are as follows:

1. Clean the tread regularly to prevent debris from getting stuck.
Clean debris such as sand, gravel, and metal shavings from the tread crevices weekly. Use a stiff brush to scrub along the tread pattern, or use compressed air to blow out debris. This prevents debris from compressing the tread over time, causing uneven wear or blocking the bearings, impacting smooth rotation.

If the tread is contaminated with oil or mildly corrosive liquids (such as soapy water or diluted detergent), wipe it clean immediately with a damp cloth. Do not allow contaminants to remain on the tread for extended periods. Although polyurethane is resistant to light oil stains, long-term residue can penetrate the tread, causing local softening or discoloration.

2. Lubricate bearings appropriately and choose the right lubricant.

Sealed bearings should be lubricated every 3-6 months, and unsealed bearings every 1-2 months. Open the bearing end cap and inject lithium-based grease (do not use lubricants such as motor oil or butter that melt easily at high temperatures). The recommended amount should fill 1/2-2/3 of the bearing's internal space. Too much grease can attract dust and form sludge, while too little can ineffectively lubricate the bearing.

After lubrication, manually rotate the caster 3-5 times to ensure even coverage of the grease on the ball bearings to avoid dry spots that can cause bearing wear.

3. Avoid overloading and rough operation to minimize tread damage.

Strictly adhere to the "rated load" marked on the caster. Do not temporarily overload (e.g., a 300kg-rated caster should not be subjected to prolonged loads exceeding 400kg). Overloading can cause tread compression, hub bending, and even bearing fracture. Avoid sudden pushes, pulls, or sharp turns when pushing: Sharp turns can increase friction between the tread edge and the ground, causing the tread to break. Push slowly when going up and down stairs or on bumpy roads to prevent impact and cracking.

4. Control the operating environment and avoid harmful factors

Avoid prolonged exposure to high temperatures (>80&deg;C) or extreme cold (<-30&deg;C): High temperatures can soften and cause the tread to stick, while extreme cold can harden and brittle it. If used in such environments for short periods, store the tread at room temperature to allow the material to regain its elasticity.

Avoid highly corrosive environments: If used in a chemical plant, avoid contact between the tread and acetone, concentrated acids, and alkalis. If contaminated, rinse immediately with clean water and dry thoroughly. If the tread develops bulges or swelling, replace it immediately and do not use it.

5. Regularly inspect structural components and promptly repair any potential problems.

Inspect the condition of each caster component monthly:

Tread: Check for cracks, chipping, or bulging. If the tread is worn to less than 1mm, replace the tread or caster.

Hub: Inspect the steel/aluminum alloy hub for deformation and corrosion. If the hub is bent, causing uneven wear on the caster, it should be corrected or replaced promptly.

Brake (if installed): Test the brakes for sensitivity. If the brake pads are severely worn or loose, adjust the brake clearance or replace the brake assembly.

6. Proper Storage to Prevent Damage from Idleness: Casters that are idle for extended periods (over one month) should be elevated to keep the tread off the ground to prevent prolonged pressure on the tread, which may cause permanent deformation.

Store in a dry, well-ventilated environment, away from direct sunlight and moisture. Direct sunlight accelerates tread degradation, and humid environments can easily cause rust on the hub and bearings.