When a machine fails it is vital that a repair is performed quickly to ensure a swift return to operation. Marelli Motori can perform repairs of low, medium and high voltage machines of any brand either at our manufacturing facilities or at the customer's premises.

Our high tech facilities, which include computerised machine centres, VPI plants, 3D measurement systems, digital and infrared diagnostics tools, along with our long experience in designing and manufacturing electrical machines, offer outstanding quality of repairs and absolute reliability.

At the end of the repair process, functional and/or load testing analysis and testing of electrical machines is performed in our test rooms that can handle machines up to 5 MW and a 15 kV before issuing full test certificates and detailed repair reports.  


  • repair jobs managed with manufacturing industrial processes and methods
  • full synergies with production plant and test room
  • fast-track delivery service to reduce the off duty time
  • zero-hours reconditioning and the benefit of warranty terms same as for a new product


  • machine removal, transportation to workshop and disassembly
  • electrical analysis, inspection and testing
  • cleaning of active parts
  • restoring of winding insulation
  • rewinding of stators and rotors
  • mechanical dimensional check
  • electrical diagnostics: resistance, insulation, polarization index, surge test, Tan-D*, partial discharges* | (*) MV | HV generators
  • AVR analysis and repair
  • radiators leakage test and complete overhaul
  • restoring of shaft insulation
  • tropicalization with special protective resin (CW1081)
  • rework | replacement of damaged components
  • rotor dynamic balancing
  • bearing replacement
  • motor | generator re-assembly
  • final acceptance test or, upon request, full load test
  • painting
  • transportation to customer's site

Service request

Please fill at least the required fields (*) below before sending your service request.

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