Importance

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Abstract

A greased-based lubrication system for a main bearing arrangement of a wind turbine can be replaced with an oil-based lubrication system by: disconnecting an upwind bearing cover 12 and/or a downwind bearing cover 12 from the bearing housing 10; cleaning grease from the bearing arrangement; connecting an upwind oil drain cover 14 to the upwind side of the bearing housing 10; and connecting a downwind oil drain cover 14 to the downwind side of the bearing housing 10. At least one of the upwind oil drain cover 14 and the downwind oil drain cover 14 include one or more outlets for an oil-based lubricant. Further steps include: connecting the one or more outlets to an oil-based lubrication system; and introducing oil-based lubricant into the bearing arrangement. This means that the greased-based lubrication system, in which debris from bearing wear accumulates and does not escape from the bearing, contributing to further wear and damage can be replaced with an oil-based lubrication system, in which the quality of the lubricant can be monitored, its temperature can be controlled, and debris can be removed by filtration. The invention also includes an oil drain cover 14.

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First Claim