Monitek, Inc. Case Study GE 1.5MW Wind Turbine Winergy Gearcase Gear Wear/Damage 1. Background The 1.5MW Wind Turbine containing a Winergy Model PEAS 4390 Step-up Gearcase operates 8,700+ hours per year with average revenues of $1500 per day. A significant intermediate shaft non drive-end bearing inner race defect was detected through vibration analysis at the first on-line recording and progressively deteriorated over the next several

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