How do you select a gearbox oil?

Many considerations have to be factored in when selecting a gearbox lubricant:

• Gearbox type: dimensions, the metal from which the teeth are made, sliding properties and gear ratio, open or closed casing, etc.
• Operating conditions: depending on the load, vibration and shock levels, anti-wear and extreme pressure properties determine the choice of lubricant.
• Service oil temperature: very low, moderate of between +20°C and +80°C, hot at more than +80°C and extreme at in excess of +120°C.
• Possible effects that the gearbox's environment might have on the lubricant: some oils have enhanced anti-corrosion properties to maintain the length of the fluid's service life in the event of exposure to humidity, dust or other elements.
• Possible effects that the lubricant might have on the gearbox's environment in the event of a leak: biodegradability, food-grade or non-staining properties may be required.
• Maintenance conditions: a synthetic fluid that can allow long intervals between oil changes and which guarantees high levels of operational safety can result in significant maintenance cost savings.