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Initial grease fill is calculated as G = 0.005 × D × B grams. For regreasing, use about 50% of this. Actual fill percentage depends on speed — 30-50% of free space is common for normal applications.

Over-greasing causes excessive churning, increased temperature, higher power consumption, and can lead to seal failure and grease leakage. At high speeds, over-greasing is more harmful than under-greasing.

Low speed (n×dm < 100,000): 50-80%. Medium speed: 30-50%. High speed (>300,000): 25-35%. Factory-sealed bearings are typically 25-35% filled.

For periodic relubrication, use approximately 50% of the full fill quantity. This delivers fresh grease to the contact areas without overfilling.

Yes. Ball bearings have more internal free space than roller bearings. The formula G = 0.005 × D × B is a good approximation for all types, but adjust fill percentage for specific bearing type and speed.