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A wind-turbine gearbox system includes an input gear stage having mating gear surfaces finished to a surface roughness of less than 0.25 micron and at least one bearing supporting the input gear stage. A lubrication circuit is arranged to deliver lubricant to the input gear stage and the bearing dur

A wind-turbine gearbox system includes an input gear stage having mating gear surfaces finished to a surface roughness of less than 0.25 micron and at least one bearing supporting the input gear stage. A lubrication circuit is arranged to deliver lubricant to the input gear stage and the bearing during operation of the wind-turbine and includes an inline filter for removal of particles of less than 2 micron from the lubricant prior to delivery. A lubricant for use in the system may have a relatively low viscosity compared to conventional wind turbine gearbox lubricants.

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1. A gearbox system for a wind turbine rated to a capacity of more than 1 MW, comprising: an input gear stage operating at less than 60 rpm and having mating gear surfaces finished to a surface roughness Ra of less than 0.25 micron;at least one bearing supporting the input gear stage;a lubrication c

1. A gearbox system for a wind turbine rated to a capacity of more than 1 MW, comprising: an input gear stage operating at less than 60 rpm and having mating gear surfaces finished to a surface roughness Ra of less than 0.25 micron;at least one bearing supporting the input gear stage;a lubrication circuit arranged to deliver lubricant to the input gear stage and the bearing during operation of the wind-turbine and comprising an inline 2 micron filter; anda quantity of lubricant in the lubrication circuit, the lubricant having an ISO VG of between 100 and 220. 2. The system of claim 1, wherein the lubricant has an ISO VG around 150. 3. The system of claim 1, further comprising a high-speed gear stage, wherein the high speed gear stage comprises mating gear surfaces finished to a surface roughness Ra of less than 0.25 micron. 4. The system of claim 1, further comprising a high-speed bearing, wherein the high speed bearing comprises one or more individual bearings finished to a surface roughness Ra of less than 0.25 micron. 5. The system of claim 1, wherein the wind-turbine gearbox system is rated to a capacity of more than 1.5 MW. 6. The system of claim 1, wherein the lubrication circuit comprises a pump and the inline filter is located on a high-pressure side of the pump. 7. The system of claim 1, wherein the inline filter is a surface filter comprising glass fiber, modified glass fiber, metal, or a polymer. 8. The system claim 1, further comprising an offline filter connected in parallel to the inline filter. 9. The system of claim 1, further comprising a magnetic filter. 10. The system of claim 9, wherein the magnetic filter is located in a sump region of the gearbox. 11. The system of claim 1, wherein the mating gear surfaces are planarized having an average peak to mean height roughness Rpm of 1 micron or less. 12. The system of claim 1, wherein the mating gear surfaces are planarized having an average peak to mean height roughness Rpm of 0.50 micron or less. 13. The system of claim 1, wherein the mating gear surfaces are chemically accelerated vibratory finished surfaces. 14. The system of claim 1, wherein the lubricant comprises more than 85% mineral or synthetic base oil. 15. The system of claim 1, wherein the lubricant comprises more than 95% mineral or synthetic base oil. 16. The system of claim 1, wherein the lubricant comprises more than 99% mineral or synthetic base oil. 17. The system of claim 1, wherein the lubricant is at least substantially free of a defoaming agent. 18. The system of claim 1, wherein the lubricant has a concentration of phosphorous of less than 500 ppm. 19. The system of claim 1, wherein the lubricant has a concentration of phosphorous of less than 10 ppm. 20. The system of claim 1, wherein the lubricant has a concentration of zinc of less than 100 ppm. 21. The system of claim 1, wherein the lubricant has a concentration of zinc of less than 10 ppm. 22. The system according claim 1, wherein the lubricant has a concentration of nitrogen of less than 100 ppm. 23. The system according claim 1, wherein the lubricant has a concentration of nitrogen of less than 10 ppm. 24. The system of claim 1, wherein the lubricant has a concentration of sulphur of less than 20 ppm. 25. The system of claim 1, wherein the lubricant has a concentration of sulphur of less than 5 ppm. 26. The system of claim 1, wherein the lubricant has a concentration of molybdenum of less than 10 ppm. 27. The system of claim 1, wherein the lubricant has a concentration of molybdenum of less than 2 ppm. 28. The system of claim 1, wherein the lubricant has a concentration of boron of less than 10 ppm. 29. The system of claim 1, wherein the lubricant has a concentration of boron of less than 100 ppb. 30. The system of claim 1, wherein the lubricant has a concentration of silicon of less than 10 ppm. 31. The system of claim 1, wherein the lubricant has a concentration of silicon of less than 100 ppb.