How do I determine if a polyurethane caster needs to be replaced?

Replacing a polyurethane caster requires a comprehensive assessment based on appearance, functional abnormalities, and safety hazards. The following are specific criteria:

1. Signs of Appearance Wear
Severe Tread Wear: Deep cracks, large areas of chipping, or irregular deformation may occur on the wheel tread, affecting proper contact with the ground. The wheel diameter may be significantly reduced due to wear, with a height difference exceeding 5mm from other casters.
Hardened/Aged Tread: The wheel tread loses its elasticity when pressed manually, and cracks and brittleness may occur. Hardening is more likely to occur in low-temperature environments, increasing rolling resistance.
Rim Damage: Severe wear or chipping on the wheel rim may cause scratches or trap debris, further damaging it.

2. Functional Abnormalities
Rolling Slowness: Noticeable jerking or unusual noises when pushed, or increased force required to move the wheel. This may be caused by axle wear, rusted bearings, or wheel tread deformation.
Steering Failure: A steering caster may not rotate smoothly, with the steering shaft becoming stuck or misaligned, affecting the maneuverability of the equipment. Reduced load capacity: Under normal load, the caster shows noticeable sinking or tilting, or the connection between the wheel frame and the wheel is loose or deformed.

3. Safety Hazard Warning
Structural Damage: The wheel frame (metal part) is cracked, bent, or broken, and the bolts connecting the wheel to the frame are loose or falling off, posing a risk of detachment.

Abnormal Noise and Vibration: A harsh metallic sound or violent vibration during rolling may indicate severe wear of internal components. Continued use may cause the equipment to tip over or components to fall off.

If any of these conditions occur, it is recommended to replace the caster promptly to avoid equipment damage, reduced work efficiency, or safety accidents caused by caster failure. Regular inspections should be carried out, and if minor wear is detected, replacement can be planned in advance to reduce the impact of sudden failures.