Gearboxes fail for many reasons, but improper lubrication is at the top of the list, according to a variety of studies:
Improper lubrication: 40 to 50 %
Improper mounting: 25 to 30 %
Other causes: approximately 20 %
Reaching the natural fatigue limit: less than 10 %
Gearboxes must be lubricated to prevent metal-to-metal contact between the rolling elements, gears, raceways and retainers. In addition, lubrication protects the gearbox and bearings against corrosion and wear, helps dissipate heat, helps seal out solid and liquid contamination, and reduces noise. A properly lubricated gearbox has the best chance of reaching its maximum service life. Especially in an agricultural environment where the amount of dust and dirt is substantial, the importance of proper lubrication is essential.
There are numerous causes for lubricant failure, including:
Insufficient lubricant quantity or viscosity
Deterioration due to prolonged service without
Contamination with foreign matter
Use of grease when conditions dictate the use of static or
Incorrect grease base for a particular application
Rolling element bearings and gearboxes depend on the continuous presence of a very thin – millionths of an inch – elastic-hydrodynamic film of lubricant between rolling elements and raceways, and between the cage, rings, rolling elements and gear teeth. Lubricant-related failures can be avoided by selecting a grease or oil that generates a sufficient film to keep bearing elements separated. A good lubricant also provides good boundary lubrication. Lubricant failures can be detected by the presence of discoloured (blue/brown) raceways and rolling elements. Excessive wear on rolling elements, rings and cages follows, resulting in overheating and subsequent catastrophic failure. In addition, if a gearbox or bearing has insufficient lubrication, or if the lubricant has lost its lubricating properties, an oil film with sufficient load-carrying capacity cannot form. The result is metal-to-metal contact between rolling elements, gear teeth and raceways, leading to adhesive wear.
The unique characteristics and properties of ENVIRO₂PRO assist you in minimizing adhesive wear, overheating and failure. The load-carrying capacity of the oil film will be restored.