Uptower See all →
Private: Brake Disc Repair Damaged brake disc sections milled out and replaced uptower. Private: Generator Shaft Repair Worn generator shafts machined back to tolerance in place. No generator replacement. Private: Yaw Gear Mounting Flange Repair Worn yaw drive mounting flanges and damaged threads repaired uptower. Private: Yaw Sliding Surface Refurbishment On-site refurbishment of worn yaw sliding surfaces. No yaw ring exchange, no crane. Yaw Ring Teeth Repair Patented in-nacelle machining. The ring is repaired where it stands - no removal, no crane. Rotor Lock Repair Full rotor lock seat restoration in-nacelle. No component removal required. Bolt Removal & Thread Repair Failed or seized bolts removed and threads recovered without replacing the host component.
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Private: Blade Surface Milling 3D milling of damaged blade areas to an exact surface - uptower or on ground. Blade Root Repair Restore damaged blade root inserts onsite, reducing downtime from months to days Private: Blade Root Bushing Replacement Worn or fatigued blade root bushings replaced in-situ without scrapping the blade.
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3D Laser Measurement 3D laser tracker and Easy Laser services. Alignment verification, quality control, dimensional inspection on-site. High precision measurement.
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Uptower Solution

Yaw Gear Mounting Flange Repair

Worn mounting flanges and damaged threaded holes milled back to tolerance uptower - stopping further damage before it spreads.

Request a quote How it works

Trusted by wind operators and OEMs across Europe and North America

  • Vestas
  • Siemens Energy
  • NextEra Energy
  • GE Vernova
  • Enercon
  • Nordex
  • EDF Renewables
  • Welcon
  • RWE
  • CS Wind
  • EEW
  • Muehlhan
  • Nicon Industries
  • Orsted
  • Cadeler
  • Vattenfall
  • Smulders
  • Windar
  • Titan Wind
  • SubC Partner
  • Semco Maritime
  • LM Wind Power
  • Iberdrola
How It Works

Flange And Threads.
Restored In Place.

The yaw ring gear mounting flange gets worn or damaged, and its threaded holes with it. Our mobile uptower machine restores both - flange surface and threads - without removing anything from the turbine.

How the repair works

  • The machine mills the flange to obtain the pre-defined tolerance levels
  • It bores - and where needed enlarges - the threaded hole, preparing it for a new insert
  • If the job requires it, a helicoil bushing or a special bushing is inserted

Why repair uptower

The repair is completed in place, restoring the functionality of the yaw system and stopping further damage development - before a worn flange becomes a bigger problem.

Technical Specifications
Equipment Mobile uptower milling machine
Flange machining To pre-defined tolerance levels
Thread repair Bored and enlarged for new insert
Inserts Helicoil or special bushing
Repair location Uptower, in place
Repaired Uptower Flange and threads restored in place - no component removal.
Function Restored The yaw drive mounts on a flange machined back to pre-defined tolerances.
Damage Stopped Repairing early stops further damage development in the yaw system.
Threads Recovered Damaged holes are prepared for helicoil or special bushings instead of being abandoned.
Speak to an engineer

Get expert advice on your project

Send us your damage report or turbine type and we'll respond within one working day with an assessment and indicative quote.

+45 70 11 02 70 info@cnconsite.dk

Damage photos help - email them directly or attach them when we reply.

Global reach

Wherever your turbines stand

On site within days Worldwide call-out, 24/7. Technicians mobilize within days of a purchase order.
Onshore & offshore The same in-nacelle method works at sea - no offshore crane deployment needed.
Three continents A proven repair track record on wind turbines across three continents.
FAQ

Frequently asked questions

Can a worn yaw gear mounting flange be repaired uptower?

Yes. A mobile machine mills the flange back to the pre-defined tolerance levels directly in the turbine.

What happens to damaged threaded holes?

The machine bores and, where needed, enlarges the threaded hole to prepare it for a new insert. If the job requires it, a helicoil bushing or a special bushing is then inserted.

Why repair the mounting flange early?

A repaired flange restores the functionality of the yaw system and stops further damage development before it spreads.

Related Solutions

More uptower services

Uptower

Private: Yaw Sliding Surface Refurbishment

On-site refurbishment of worn yaw sliding surfaces. No yaw ring exchange, no crane.

Learn more →
Uptower

Private: Brake Disc Repair

Damaged brake disc sections milled out and replaced uptower.

Learn more →
Uptower

Private: Generator Shaft Repair

Worn generator shafts machined back to tolerance in place. No generator replacement.

Learn more →
More wind turbine solutions
Blade Private: Blade Surface Milling Blade Blade Root Repair Blade Private: Blade Root Bushing Replacement Structures & Flanges Monopiles & TPs Structures & Flanges Tower Flanges Structures & Flanges Sea Fastening
All wind solutions →