Update: Vestas boss rues 'nasty surprise' of gearbox fault

Danish manufacturer Vestas’ plans to turn around its financial performance have been hit by a fault affecting large numbers of gearboxes supplied by Hansen Transmissions (now part of German-owned ZF Friedrichshafen) for its V90 3MW wind turbines.

The news came as a shock to analysts amid worse-than-expected financial results and could significantly damage Vestas’ reputation. Chief executive Ditlev Engel described the issue, which was detected by Vestas’ own performance diagnostic centre and affects 376 turbines it sold between June 2009 and September 2011 — including 36 offshore — as a “very nasty surprise”.

The affected turbines account for a third of V90s shipped during the period. The turbines may need extra maintenance, repair or replacement due to malfunctioning bearings, Vestas says.

Engel says Vestas will hold discussions with…

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