Re: Sluggish synchronous motor
Hypoid gears are designed to operate with their shaft centre lines offset. This means that there is a sliding component as well as the rolling motion present in geared drives. The sliding motion places great demands on the oil film strength and hypoid oils contain additives of chlorine and sulphur compounds to achieve this film strength - hence the distinctive smell.
The downside of these oils is that the additives are corrosive to non-ferrous metals, especially brass, copper and bronze when they are hot.
As our friend Ricard points out, there's no substitute for reading the manual. Putting hypoid oil in a gearbox containing bearings with brass cages or bronze selector forks spells disaster.
Leon.
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