Four Benefits of this Seminar Awareness of gear oil’s necessityAwareness of gear oil’s necessity Know-how behind common equipment problemsKnow-how behind common equipment problems Problem-solving power of gear oilProblem-solving power of gear oil Benefits of flushing your systemBenefits of flushing your system
The gear box and transmission can be the most neglected components on heavy equipment
Unfortunately, they are susceptible to many costly problems...
Severe gear tooth damage - due to inefficient lubrication
The Single Most Important Feature of a Lubricating Oil Measurement of the internal friction of a fluid (Absolute) or Measurement of the flow rate of a liquid at a certain temperature ( Kinematic or Absolute Density ) Oil Viscosity
Why is it Important?
30°C Low viscosity oils flow freely Medium viscosity High viscosity move more slowly At constant temperature …
Low viscosity recommended for low temperatures High viscosity for higher temperatures Type of oilOperation characteristics Light oils(low viscosity)High speed– Light load Thick oils(high viscosity)Slow speed– Heavy load Viscosity of oil is affected by temperature Oil will thin out when heated and thicken in cold temperatures
Oil Viscosity Index Measures the rate at which the viscosity of oil (thickness) changes in relationship to changes in operating temperatures. The higher the viscosity index (V.I.), the more the oil keeps the same viscosity when operating temperatures change.
More resistant to change in thickness with variations in temperature Better lubricating quality Less resistant to change in thickness with variations in temperature Poorer lubricating quality Viscosity Index Above 100 usually indicates multi viscosity oils High quality single grade oils
Monograde Gear Oils Viscosity measured at 100°C The lower the number, the thinner the oil Typical examples of Grades are SAE 50, SAE 90 and SAE 140. The Viscosity Index will typically be less than 100
Multi-Grade Gear Oils Contain viscosity improvers (limit the oil’s tendency to thin as it gets hotter). Measured at two different temperatures to tell you how the oil behaves when both hot and cold. The Viscosity Index will be greater than w90 80w refers to the oils viscosity at low temperature so that it does not thicken too much 90 refers to the oil viscosity at high temperature so that is does not thin too much This example is for a multi-grade transmission (gear) oil
Typical Viscosity-Temperature relationship for an SAE 10w-30 oil Kinematic Viscosity cSt SAE 30 Oil SAE 10w Oil SAE 10w Temp Deg C Thicker Thinner
ISO Rating Systems ISO ratings are used for industrial fluid lubricants such as hydraulic and industrial gear oils The viscosity of the ISO grades is measured at 40°C instead of 100 °C Automotive oils use the SAE Classification system