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HSS bearing

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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.

The HSS bearing is a gearbox bearing on the generator side, identified in records as part FGT-P-22328.12345 It is linked in the records to high temperature alarms, elevated vibration, wear, and spalling.678910451112 The bearing is currently below minimum stock, with replacements on order and work orders waiting for parts.121314151617

Facts

  • Alarm A2110, Gearbox HSS bearing temperature high at 90 °C, can be caused by bearing damage or lubrication starvation; checks are vibration trend review and endoscope inspection of the bearing.6
  • The HSS bearing vibration on the generator side rose from 2.1 mm/s RMS to 5.2 mm/s RMS and exceeded the 4.5 mm/s alarm level.7
  • A contributing factor was generator-side HSS bearing wear, supported by oil analysis TR-OA-2026-0614 with iron at 64 ppm, PQ index 112, and the vibration trend.8
  • Replacing the generator-side HSS bearing FGT-P-22328 under WO-26-0412 is waiting for parts and is planned on delivery of the bearing.18
  • WTG-02 recorded A2110 Gearbox HSS bearing temperature high twice in this part, with raised values of 91.2 °C on 2026-07-19 and 90.6 °C on 2026-07-22.910
  • FGT-P-22328, the HSS bearing on the generator side for FGT-3200, is a critical item below minimum stock: 0 pc on hand, minimum 1 pc, reorder quantity 2 pc, and 2 pc on order under PO-76994 for expected delivery on 2026-09-25.12
  • WO-26-0187 for WTG-10 replaced the generator-side HSS bearing, was completed as high-priority corrective maintenance, used part FGT-P-22328 quantity 1, and notes that the last spare bearing was used.3
  • WO-26-0412 for WTG-07 is a high-priority corrective-maintenance work order to replace the generator-side HSS bearing, is waiting for parts, lists part FGT-P-22328 quantity 1, and remarks that vibration is above the alarm level of 4.5 mm/s.4
  • WO-26-0439 for WTG-02 is waiting for parts for a generator-side HSS bearing replacement after spalling was found at endoscopy on 2026-07-23, and it lists part FGT-P-22328 quantity 1.5
  • Typical gearbox-related failure modes listed are HSS bearing damage, micropitting on gear teeth, cooler fouling and fan motor failures, and oil leaks at seals and hoses.19
  • There had been no HSS bearing FGT-P-22328 in stock since the WTG-10 repair in March.13
  • The email was sent by Tomasz Lebrecht to Dario Penwarden on 22 July 2026 with the subject “Parts shortage - HSS bearing FGT-P-22328 below minimum stock.”14
  • A stock snapshot dated 21 July showed that HSS bearing FGT-P-22328 on the generator side was below its minimum level.20
  • For HSS bearing FGT-P-22328, stock was 0 on hand, minimum 1, and 2 on order under PO-76994 to Fabrikam.15
  • The last HSS bearing was used on WTG-10 in March under WO-26-0187, and Fabrikam confirmed delivery of two bearings in week 39, from 21 to 25 September 2026.16
  • WO-26-0412 for WTG-07 HSS bearing replacement cannot start until the bearings arrive.17
  • WTG-02 had an endoscope inspection on 23/07 that found spalling on the HSS bearing on the generator side.11
  • WTG-07 still has HSS bearing vibration around 5.3 mm/s; oil temperature has been normal since the fan motor replacement, and WO-26-0412 is waiting for the bearing.12

Timeline

  • 2026-07-19: WTG-02 recorded A2110 Gearbox HSS bearing temperature high twice in this part, with raised values of 91.2 °C on 2026-07-19 and 90.6 °C on 2026-07-22.910
  • 2026-07-22: The email was sent by Tomasz Lebrecht to Dario Penwarden on 22 July 2026 with the subject “Parts shortage - HSS bearing FGT-P-22328 below minimum stock.”14
  • 2026-07-23: WO-26-0439 for WTG-02 is waiting for parts for a generator-side HSS bearing replacement after spalling was found at endoscopy on 2026-07-23, and it lists part FGT-P-22328 quantity 1.5
  • 2026-09-25: FGT-P-22328, the HSS bearing on the generator side for FGT-3200, is a critical item below minimum stock: 0 pc on hand, minimum 1 pc, reorder quantity 2 pc, and 2 pc on order under PO-76994 for expected delivery on 2026-09-25.12
  • 2026-09-25: The last HSS bearing was used on WTG-10 in March under WO-26-0187, and Fabrikam confirmed delivery of two bearings in week 39, from 21 to 25 September 2026.16

Documents

Sources

Footnotes

  1. Spare Parts Stock Snapshot 2026-07-21 for Quellmoor Ridge O&M Building — sheet "About", row 3 · table ↩ ↩2 ↩3 ↩4

  2. Spare Parts Stock Snapshot 2026-07-21 for Quellmoor Ridge O&M Building — sheet "Stock", row 2 · table ↩ ↩2 ↩3 ↩4

  3. Work Orders Export through 2026-08-31 — row 38 · table ↩ ↩2

  4. Work Orders Export through 2026-08-31 — row 73 · table ↩ ↩2 ↩3

  5. Work Orders Export through 2026-08-31 — row 80 · table ↩ ↩2 ↩3 ↩4

  6. LWS-MM-GBX-32 Rev. D — LT-32 Maintenance Manual Chapter 4 Gearbox Excerpt — p. 5 · ✓ quote verified ↩ ↩2

  7. 8D report INC-2026-006 - Repeated gearbox oil over-temperature on WTG-07 (revision 2026-07-10) — ¶ 7 · ✓ quote verified ↩ ↩2

  8. 8D report INC-2026-006 - Repeated gearbox oil over-temperature on WTG-07 (revision 2026-07-10) — ¶ 18 · ✓ quote verified ↩ ↩2

  9. SCADA alarm and status log, 2026-04-01 to 2026-08-31 — row 1330 · table ↩ ↩2 ↩3

  10. SCADA alarm and status log, 2026-04-01 to 2026-08-31 — row 1366 · table ↩ ↩2 ↩3

  11. Shift Handover for 2026-07-29 Day Shift — lines 5–14 · ✓ quote verified ↩ ↩2

  12. Shift handover - 2026-07-15 (day shift to night shift) — lines 11–14 · ✓ quote verified ↩ ↩2

  13. Monthly O&M Review Minutes – 2026-06-18 — ¶ 16 · ✓ quote verified ↩ ↩2

  14. Parts shortage - HSS bearing FGT-P-22328 below minimum stock — message headers · ✓ quote verified ↩ ↩2 ↩3

  15. Parts shortage - HSS bearing FGT-P-22328 below minimum stock — message body, line 8 · ✓ quote verified ↩ ↩2

  16. Parts shortage - HSS bearing FGT-P-22328 below minimum stock — message body, lines 10–12 · ✓ quote verified ↩ ↩2 ↩3

  17. Parts shortage - HSS bearing FGT-P-22328 below minimum stock — message body, lines 14–16 · ✓ quote verified ↩ ↩2

  18. 8D report INC-2026-006 - Repeated gearbox oil over-temperature on WTG-07 (revision 2026-07-10) — table 2, row 5 · table ↩

  19. Gearbox Fundamentals for Wind Technicians — slide 8 · ✓ quote verified ↩

  20. Parts shortage - HSS bearing FGT-P-22328 below minimum stock — message body, lines 5–6 · ✓ quote verified ↩

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

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