Quellmoor Ridge O&M wiki

Fictional sample. Every organisation, person, site and document in this wiki is invented. Not for operational use.

SB-LWS-2025-11 Rev. A - Pitch Bearing Bolt Re-torque

4 min read

FICTIONAL SAMPLE - Contoso Renewables, Quellmoor Ridge Wind Farm and every organisation, person, product and value in this wiki are invented. Not for operational use.

This Litware Wind Systems service bulletin covers a mandatory one-time re-torque of pitch bearing bolts on LT-32 turbines. It states the reason, required torqueing instructions, compliance timing, and record-return requirements.

Key facts

  • Litware Wind Systems issued the service bulletin on 2025-10-06.1
  • The bulletin number is SB-LWS-2025-11 and the revision is A.1
  • The bulletin category is mandatory.1
  • 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
  • Compliance is required at the next 12-month service.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
  • The turbine must be stopped, the rotor locked, and the pitch system isolated before the work.1
  • The hydraulic torque wrench used for the work must have been calibrated within the last 12 months and have accuracy of +/- 3 %.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
  • Each bolt must be marked with a paint line after re-torque.1
  • Every bolt that turns more than 60 degrees before reaching the torque must be recorded and reported to Litware Wind Systems.1
  • The turbine, blade, torque wrench serial number, and bolts that turned must be recorded on the re-torque form, which must be returned to Litware Wind Systems within 60 days.1

Contents

Bulletin identification and applicability

Litware Wind Systems identifies the document as a service bulletin.2

The title is “SB-LWS-2025-11 Rev. A - Pitch bearing bolt re-torque.”2

Litware Wind Systems issued the service bulletin on 2025-10-06.2

The document is marked “FICTIONAL - NOT FOR OPERATIONAL USE.”2

Table t01 · p. 1

RowFieldValue
2Bulletin numberSB-LWS-2025-11
3RevisionA
4Issue date2025-10-06
5CategoryMandatory
6Applies toLT-32 turbines, all variants (M30 10.9 pitch bearing bolts, 72 per blade bearing, 216 per turbine)
7ComplianceAt the next 12-month service

Agents can query this table as t01 with the query_table tool.

Reason

Loose pitch bearing bolts were found on two LT-32 turbines at another site after three years of operation.2

The bulletin states that a one-time re-torque of all bolts restores the preload.2

Instructions

  • Stop the turbine, lock the rotor, and isolate the pitch system.2
  • Use a hydraulic torque wrench calibrated within the last 12 months with accuracy of +/- 3 %.2
  • Re-torque 100 % of the pitch bearing bolts to 1,450 Nm in the cross pattern of the bolt map, blade by blade.2
  • Mark each bolt with a paint line after re-torque.2
  • Record every bolt that turns more than 60 degrees before reaching the torque and report it to Litware Wind Systems.2

Records

Record the turbine, blade, torque wrench serial number, and the bolts that turned on the re-torque form, and return the form to Litware Wind Systems within 60 days.2

Figures

No figures were extracted from this document.

Sources

Footnotes

  1. SB-LWS-2025-11 Rev. A - Pitch Bearing Bolt Re-torque — p. 1 · ✓ quote verified ↩ ↩2 ↩3 ↩4 ↩5 ↩6 ↩7 ↩8 ↩9 ↩10 ↩11 ↩12

  2. SB-LWS-2025-11 Rev. A - Pitch Bearing Bolt Re-torque — p. 1 · paraphrase ↩ ↩2 ↩3 ↩4 ↩5 ↩6 ↩7 ↩8 ↩9 ↩10 ↩11 ↩12

Provenance badges✓ quote verified the quoted words were found verbatim in the source textparaphrase reworded from the source text; numbers checked, no verbatim quote

Graph View

Backlinks