Gear reducers can be complex devices that apply the science of gearing and mechanical benefit to run thousands of complex procedures in many different industries. Gearbox manufacturers have designed a number of gearboxes in multitudes of different configurations and equipment ratios. When failures happen it is critical to understand how to gear reducer box repair the failed systems and preventing future failures to keep production up and running.
Three things that may cause premature failing are poor lubrication, misalignment and overloading. Failure settings can involve bearing failures or gear failures, or both.
Lubrication is crucial for both bearing and equipment life. Important 
areas of lubrication are the level of lubricant that is delivered to each equipment mesh and bearings, along with the properties of the lubricant. The lubricant forms a slim film that helps prevent metal-to-metal contact between gears and between bearing components. Modern industrial gears make use of an involute tooth form and tooth engagement, which is a mixture of rolling and sliding. The oil film is usually a thin barrier between moving parts which allows the rotating push to turn the gears very easily without harm to the metal surfaces. Contamination in the lubricant can lead to scuffing and far faster use for both bearings and the gearing in a gearbox, so it is imperative that maintenance mechanics check gearbox lubricant for contamination periodically, once for calendar year as a minimum. Each gearbox would have a recommended essential oil level as well as a technique to lubricate both bearings and the apparatus established. With bath lubrication, all shifting components dip down below the essential oil level. With splash lubrication, essential oil can be splashed around in the gearbox casing by fast moving parts, covering all shifting parts. With pressure lubrication, oil is definitely pumped to each equipment mesh and bearing through spray nozzles or essential oil passages from the gearbox essential oil sump or from and external reservoir.