What types of gear damage can be cause by overheated lubrication oil?

Overheated lubrication oil can lead to several types of gear damage, including increased wear and tear due to insufficient lubrication, which may result in pitting or spalling of the gear teeth. It can also cause thermal degradation of the oil, leading to the formation of sludge and varnish that can obstruct lubrication pathways. Additionally, overheating can weaken the gear material, making it more susceptible to fatigue and failure. Overall, the performance and lifespan of the gears are significantly compromised under these conditions.