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[Hardened carburizing grinding gears] Why add oil?
1) to reduce friction and reduce the power loss.
2) dispersing heat, play a cooling effect.
3) to prevent corrosion and rust.
4) Rinse dirt, especially rushed between tooth surface dirt and reduce wear and tear.

Links:
Wind power equipment yaw gear http://www.nsk-zg.com/products-detail.asp?cpid=354
Wind power equipment pitch pinion http://www.nsk-zg.com/products-detail.asp?cpid=348