1. Determine bearing and operating conditions
- Bearing type: Ball, roller, needle, etc.
-
Rotational speed (rpm) and DN value (
DN = bearing diameter (mm) × rpm). - Load type: Light, medium or heavy load.
- Temperature range: Operating and maximum temperature.
- Environmental factors: Humidity, dust, chemical effects.
2. Select the basic properties of the grease
-
Base oil (mineral/synthetic):
- For high speed and temperature, synthetic-based greases are preferred.
-
Thickener:
- Lithium, lithium complex, aluminum complex are commonly used in bearings.
-
Additives:
- Anti-wear, antioxidant, EP additives, electrical insulation (in inverter motors).
3. NLGI and viscosity
- NLGI grade: 0–2 (lower for high speeds, medium for low speeds).
-
ISO VG (base oil viscosity): Should be selected according to speed and temperature.
- Low speed: VG 100–220
- High speed: VG 32–100
4. Grease quantity and application method
- Correct quantity: 30–50% of the bearing free space.
- Application method: Manual greasing, centralized system, drip lubrication or circulating oil lubrication.
- Over-greasing leads to overheating, under-greasing leads to premature wear.
5. Summary criteria
| Feature | Recommendation |
|---|---|
| Base oil | Synthetic or mineral, synthetic preferred for high speed and temperature |
| Thickener | Lithium, lithium complex, aluminum complex |
| NLGI | 0–2 (depending on speed and load) |
| ISO VG | 32–220 (depending on speed and temperature) |
| Additives | Anti-wear, antioxidant, low conductivity (inverter motors) |
| Application | Correct quantity, appropriate method (manual/centralized/circulating) |
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