The question of “Should You Grease New Bearings” is a common one among DIYers, mechanics, and anyone involved in maintaining machinery. While it might seem intuitive to add lubrication to something that moves, the answer isn’t always a simple yes or no. Understanding the factory treatment of bearings is key to making the right decision.
The Truth About New Bearings and Grease
When you purchase a new bearing, it’s not typically in a dry state. Manufacturers go to great lengths to ensure their products are ready for immediate use, and this often includes a specific type and amount of grease applied during the manufacturing process. This factory-installed grease serves a vital purpose: to protect the bearing during storage and transit, and to provide initial lubrication until it’s integrated into its working environment. The presence and type of factory grease are crucial factors in determining if you need to add more.
Generally, most new bearings, especially those used in common applications like automotive wheels or industrial equipment, come pre-greased. This pre-lubrication ensures that the bearing is protected from corrosion and wear from the moment it’s installed. However, the type and quantity of grease can vary significantly depending on the bearing’s intended use. For example:
- Sealed bearings are designed to keep contaminants out and lubricant in, and are fully packed from the factory.
- Shielded bearings offer some protection but are not as robust as sealed bearings and might have less grease.
- Open bearings, while less common for new purchases that aren’t part of a larger assembly, usually have a minimal amount of protective coating.
Whether you should grease new bearings often depends on the specific type of bearing and the manufacturer’s recommendations. For sealed bearings, adding more grease is usually unnecessary and can even be detrimental, as it can force out the existing lubricant or damage the seals. For shielded or open bearings, it might be advisable to inspect and potentially top up the grease, but only after verifying what was applied at the factory. A quick reference table can help clarify:
| Bearing Type | Factory Grease | Add Grease? |
|---|---|---|
| Sealed | Full | No (generally) |
| Shielded | Partial | Consider, but check specs |
| Open | Minimal protective coating | Often yes |
Ultimately, always refer to the bearing manufacturer’s documentation or the equipment manual for the most accurate guidance. They will specify the type of grease required and whether re-greasing is recommended before installation. Skipping this crucial step can lead to premature wear and failure, while over-greasing can cause its own set of problems.
For a comprehensive understanding of bearing lubrication and maintenance, dive deeper into the detailed information provided in the resource that follows this explanation. It will equip you with the knowledge to make informed decisions about your bearings.