If you're experiencing issues like noise, vibration, or play in the wheels, you likely need to replace the entire bearing assembly, not repack it. This is a moderately advanced repair job that often requires specialized tools (like a bearing press) and a good understanding of automotive mechanics. It's usually best left to a professional mechanic.
Before concluding you need new bearings, ensure you've checked other potential causes of wheel issues such as:
* Tire pressure: Uneven tire pressure can cause vibration.
* Tire wear: Worn tires can cause noise and vibration.
* Brake components: Worn brake pads or rotors can cause noise and vibration.
* Wheel alignment: Poor alignment can lead to vibrations.
If after checking these, you suspect a wheel bearing issue, consult a professional mechanic. They have the expertise and tools to diagnose the problem correctly and perform the necessary repair safely and effectively.