How to solve the RV worm reducer fever and oil spills?

helical bevel worm gearmotor in order to improve efficiency, the use of non-ferrous metals generally do worm, the worm is using hard steel, as it is sliding friction drive, during operation, it will have a higher heat, so that the various parts and seals reducer the difference between the thermal expansion, thereby creating a gap with the surface, while the oil thinning due to temperature rise, likely to cause leaks. There are four main reasons, first, the material mix is ​​reasonable, the second is the quality of the engagement surface friction surface, and the third is the lubricant of choice, add the amount is correct, Fourth, assembly quality and the environment.