pitch bearing bolts

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Pitch bearing bolts are M30 10.9 bolts used on all variants of LT-32 turbines, with 72 bolts per blade bearing and 216 bolts per turbine.¹ A current bulletin for them requires re-torquing 100% of the bolts to 1,450 Nm in the cross pattern of the bolt map, blade by blade.¹

Facts

• The bulletin applies to all variants of LT-32 turbines with M30 10.9 pitch bearing bolts, 72 bolts per blade bearing, and 216 bolts per turbine.¹
• The reason for the bulletin is that loose pitch bearing bolts were found on two LT-32 turbines at another site after three years of operation, and a one-time re-torque restores the preload.¹
• Technicians must re-torque 100 % of the pitch bearing bolts to 1,450 Nm in the cross pattern of the bolt map, blade by blade.¹

Timeline

No dated facts.

Documents

• SB-LWS-2025-11 Rev. A - Pitch Bearing Bolt Re-torque
• Maintenance Plan 2026, Issue 2 — Quellmoor Ridge Wind Farm
• Spare Parts Stock Snapshot 2026-07-21 for Quellmoor Ridge O&M Building
• Work Orders Export through 2026-08-31

Related

• Topics: Blades, pitch bearings and main-component lifts, Gearbox lubrication and oil changes, Gearbox temperature, vibration and oil analysis, Generator brushes and electrical systems, Safety, isolation and work at height, Spare parts, stock levels and supply

Sources

Footnotes

1. SB-LWS-2025-11 Rev. A - Pitch Bearing Bolt Re-torque — p. 1 · ✓ quote verified ↩ ↩² ↩³ ↩⁴ ↩⁵

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