pitch bearing

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Pitch bearing bolt re-torque applies to all variants of LT-32 turbines with M30 10.9 pitch bearing bolts.¹ The task covers 100% of pitch bearing bolts and specifies a torque of 1,450 Nm in the cross pattern of the bolt map, blade by blade.¹² On Quellmoor Ridge Wind Farm, the maintenance plan schedules this task every 12 months, and work orders show it completed for WTG-01 through WTG-06 and planned for WTG-07 through WTG-12.^{234567891011121314}

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
• Pitch bearing bolt re-torque task MP-PIT-01 covers 100 % of bolts at 1,450 Nm, is scheduled every 12 months, and references SB-LWS-2025-11 Rev. A.²
• Pitch bearing bolt re-torque work for WTG-01 through WTG-06 was completed with a stated torque of 1,450 Nm and coverage of 100 % of bolts, referenced to SB-LWS-2025-11 Rev. A.³⁴⁵⁶⁷⁸
• Pitch bearing bolt re-torque work for WTG-07 through WTG-12 is planned for September 2026, with each title stating 1,450 Nm and 100 % of bolts and reference SB-LWS-2025-11 Rev. A.^91011121314

Timeline

• 2025-11: Pitch bearing bolt re-torque task MP-PIT-01 covers 100 % of bolts at 1,450 Nm, is scheduled every 12 months, and references SB-LWS-2025-11 Rev. A.²
• 2025-11: Pitch bearing bolt re-torque work for WTG-01 through WTG-06 was completed with a stated torque of 1,450 Nm and coverage of 100 % of bolts, referenced to SB-LWS-2025-11 Rev. A.³⁴⁵⁶⁷⁸
• 2026-09: Pitch bearing bolt re-torque work for WTG-07 through WTG-12 is planned for September 2026, with each title stating 1,450 Nm and 100 % of bolts and reference SB-LWS-2025-11 Rev. A.^91011121314

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

2. Maintenance Plan 2026, Issue 2 — Quellmoor Ridge Wind Farm — sheet "Tasks", row 11 · table ↩ ↩² ↩³ ↩⁴

3. Work Orders Export through 2026-08-31 — row 45 · table ↩ ↩² ↩³

4. Work Orders Export through 2026-08-31 — row 46 · table ↩ ↩² ↩³

5. Work Orders Export through 2026-08-31 — row 47 · table ↩ ↩² ↩³

6. Work Orders Export through 2026-08-31 — row 48 · table ↩ ↩² ↩³

7. Work Orders Export through 2026-08-31 — row 49 · table ↩ ↩² ↩³

8. Work Orders Export through 2026-08-31 — row 50 · table ↩ ↩² ↩³

9. Work Orders Export through 2026-08-31 — row 90 · table ↩ ↩² ↩³

10. Work Orders Export through 2026-08-31 — row 91 · table ↩ ↩² ↩³

11. Work Orders Export through 2026-08-31 — row 92 · table ↩ ↩² ↩³

12. Work Orders Export through 2026-08-31 — row 93 · table ↩ ↩² ↩³

13. Work Orders Export through 2026-08-31 — row 94 · table ↩ ↩² ↩³

14. Work Orders Export through 2026-08-31 — row 95 · table ↩ ↩² ↩³

Provenance badges✓ quote verified the quoted words were found verbatim in the source texttable values parsed deterministically from the cited table rows