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SB-LWS-2025-07 Rev. A - Gearbox oil viscosity grade change for LT-32 CCV turbines

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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 changes the gearbox oil specification for affected LT-32 cold-climate turbines. It covers applicability, compliance timing, oil conversion instructions, parts and labour, and completion reporting.

Key facts

  • Litware Wind Systems issued the service bulletin on 2025-03-14.1
  • The bulletin is categorized as recommended, but mandatory to keep the gearbox warranty.1
  • The bulletin applies to LT-32 turbines delivered in CCV configuration with Fabrikam FGT-3200 gearboxes and to LT-32 standard turbines at sites where ambient temperature regularly falls below -20 °C.1
  • The affected document is LWS-MM-GBX-32 Rev. D, section 4.2 on lubrication.1
  • Compliance is required at the next scheduled oil change and no later than 2025-12-31.1
  • The reason for the change is that cold-site reports showed start-up heating times of more than 6 hours at -25 °C ambient and filter bypass events with ISO VG 320 oil.1
  • For affected turbines, the gear oil changes from Proseware PWG 320 to Proseware PWG 220.1
  • For affected turbines, the viscosity grade changes from ISO VG 320 to ISO VG 220.1
  • The total oil volume remains 410 L.1
  • The minimum oil sump temperature before start-up changes from +10 °C to +5 °C.1
  • Warning A2101 and trip A2102 temperature thresholds remain 75 °C and 82 °C.1
  • The conversion instructions say to stop the turbine and isolate the drivetrain according to the site lockout procedure.1
  • PWG 320 must be drained at an oil temperature between 40 and 60 °C.1
  • The oil filter element FGT-P-11872 must be replaced during the conversion.1
  • The gearbox must be flushed with 60 L of PWG 220, the electric oil pump run for 30 minutes, and the flush oil then drained.1
  • The gearbox must be filled with 410 L of PWG 220 through a filter cart with a 10 micron element.1
  • After flushing, residual PWG 320 must not exceed 5 % of total oil volume.1
  • The controller parameter GBX_TMIN_START must be changed from 10 to 5 °C.1
  • The gearbox filler must be labelled 'PWG 220' using the supplied label kit.1
  • A reference oil sample must be taken after 24 hours of operation.1
  • Per turbine, parts and labour include 470 L of Proseware PWG 220, one FGT-P-11872 oil filter element, one PWG 220 label kit, and labour by 2 technicians for about 6 hours.2
  • The completion form in annex B must be returned to Litware Wind Systems within 30 days of each conversion.2
  • Conversions performed according to the bulletin keep the gearbox warranty valid.2

Contents

Bulletin identification and applicability

Litware Wind Systems issued this service bulletin on 2025-03-14.3

The bulletin number is SB-LWS-2025-07 and the revision is A.3

The category is recommended, but the bulletin is mandatory to keep the gearbox warranty.3

The bulletin applies to LT-32 turbines delivered in CCV configuration with Fabrikam FGT-3200 gearboxes and to LT-32 standard turbines at sites where ambient temperature regularly falls below -20 °C.3

The affected document is LWS-MM-GBX-32 Rev. D, section 4.2 on lubrication.3 Compliance is required at the next scheduled oil change and no later than 2025-12-31.3

Table t01 · p. 1

RowFieldValue
2Bulletin numberSB-LWS-2025-07
3RevisionA
4Issue date2025-03-14
5CategoryRecommended; mandatory to keep the gearbox warranty
6Applies toLT-32 turbines delivered in CCV configuration with Fabrikam FGT-3200 gearboxes (all serial numbers), and LT-32 standard turbines at sites where the ambient temperature regularly falls below -20 °C
7Affected documentLWS-MM-GBX-32 Rev. D, section 4.2 (lubrication)
8ComplianceAt the next scheduled oil change and no later than 2025-12-31

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

Reason

Cold-site field reports showed start-up heating times of more than 6 hours at -25 °C ambient and filter bypass events with ISO VG 320 oil.3

The bulletin states that a lower viscosity grade shortens start-up time and keeps the filter element in service.3

Change

The bulletin amends the lubricant specification in section 4.2 of LWS-MM-GBX-32 Rev. D for the turbines listed under the applicability statement.3

The gear oil changes from Proseware PWG 320 to Proseware PWG 220.3 The viscosity grade changes from ISO VG 320 to ISO VG 220.3

The total oil volume remains 410 L.3 The minimum oil sump temperature before start-up changes from +10 °C to +5 °C.3 Warning A2101 and trip A2102 remain at 75 °C and 82 °C.3

Table t02 · p. 1

RowItemLWS-MM-GBX-32 Rev. DAfter this bulletin
2Gear oilProseware PWG 320Proseware PWG 220
3Viscosity gradeISO VG 320ISO VG 220
4Total oil volume410 L410 L (unchanged)
5Minimum oil sump temperature before start-up+10 °C+5 °C
6Warning A2101 / trip A210275 °C / 82 °C75 °C / 82 °C (unchanged)

Agents can query this table as t02 with the query_table tool.

Instructions

  • Stop the turbine and isolate the drivetrain according to the site lockout procedure.3
  • Drain PWG 320 at an oil temperature between 40 and 60 °C.3
  • Replace the oil filter element FGT-P-11872.3
  • Flush the gearbox with 60 L of PWG 220 by filling, running the electric oil pump for 30 minutes, and draining.3
  • Fill with 410 L of PWG 220 through a filter cart with a 10 micron element.3
  • Keep residual PWG 320 after flushing at no more than 5 % of total oil volume.3
  • Change controller parameter GBX_TMIN_START from 10 to 5 °C.3
  • Label the gearbox filler 'PWG 220' with the supplied label kit.3
  • Take a reference oil sample after 24 hours of operation.3

Parts and labour

The parts and labour table gives per-turbine quantities for Proseware PWG 220, oil filter element FGT-P-11872, the PWG 220 label kit, and labour.4

Table t03 · p. 2

RowItemQuantity per turbine
2Proseware PWG 220 (60 L flush + 410 L fill)470 L
3Oil filter element FGT-P-118721
4Label kit 'PWG 220'1
5Labour2 technicians, about 6 hours

Agents can query this table as t03 with the query_table tool.

Reporting and completion form

The completion form in annex B must be returned to Litware Wind Systems within 30 days of each conversion.4

The bulletin states that conversions made according to it keep the gearbox warranty valid.4

The completion form records the turbine serial number, gearbox serial number, conversion date, PWG 220 batch number, estimated residual PWG 320 percentage, and technician name and signature.4

Table t04 · p. 2

RowFieldEntry
2Turbine serial number
3Gearbox serial number
4Conversion date
5PWG 220 batch number
6Estimated residual PWG 320 (%)
7Technician name and signature

Agents can query this table as t04 with the query_table tool.

Figures

No figures were extracted from this document.

Sources

Footnotes

  1. SB-LWS-2025-07 Rev. A - Gearbox oil viscosity grade change for LT-32 CCV turbines — p. 1 · ✓ quote verified ↩ ↩2 ↩3 ↩4 ↩5 ↩6 ↩7 ↩8 ↩9 ↩10 ↩11 ↩12 ↩13 ↩14 ↩15 ↩16 ↩17 ↩18 ↩19 ↩20

  2. SB-LWS-2025-07 Rev. A - Gearbox oil viscosity grade change for LT-32 CCV turbines — p. 2 · ✓ quote verified ↩ ↩2 ↩3

  3. SB-LWS-2025-07 Rev. A - Gearbox oil viscosity grade change for LT-32 CCV turbines — p. 1 · paraphrase ↩ ↩2 ↩3 ↩4 ↩5 ↩6 ↩7 ↩8 ↩9 ↩10 ↩11 ↩12 ↩13 ↩14 ↩15 ↩16 ↩17 ↩18 ↩19 ↩20 ↩21 ↩22 ↩23

  4. SB-LWS-2025-07 Rev. A - Gearbox oil viscosity grade change for LT-32 CCV turbines — p. 2 · paraphrase ↩ ↩2 ↩3 ↩4

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

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