A Plus Electric Motor Repair, Inc. repairs and rewinds Marathon motors at our shop in St. Charles, Illinois. Marathon motors run pumps, fans, compressors and process equipment in plants across the Midwest, and we repair Marathon AC motors up to 650 HP for customers throughout northern Illinois, northwest Indiana and southern Wisconsin.
- AC and DC motors up to 650 HP
- Rewinding, balancing and machining done in house
- EASA member shop, with a lead rewinder who has been rewinding motors since the 1970s
- Standard repairs in 7 to 10 days, rush repairs in 3 to 5 days
- One-year repair warranty
- Free pickup and delivery within 50 miles of St. Charles
Marathon Is Now Part of WEG
Marathon was a Regal Beloit brand for decades. In 2024, Regal Rexnord sold its industrial motors and generators business, including Marathon, to WEG. Motors already in service carry Marathon or Regal nameplates either way, and we repair both. Smaller HVAC and commercial motors under the Century and Leeson names remain with Regal Rexnord.
Marathon Equipment We Repair
- General purpose and premium efficiency three phase motors
- Severe duty and chemical duty motors
- Inverter duty motors
- Pump, fan and compressor motors
- Single phase motors
Our Marathon Repair Process
- Incoming inspection. We record the nameplate data and the motor’s condition when it arrives.
- Testing. Ground testing, surge comparison and core loss testing identify winding and core problems.
- Teardown and failure analysis. We inspect bearings, shaft, rotor, stator and housings to find the cause of failure, not just the symptom.
- Written quote. You receive a repair quote, and a replacement quote when a new Marathon motor or equivalent makes more sense.
- Repair. Rewinding, bearing replacement, shaft and housing machining, and brake work as required.
- Balancing and final testing before the motor is returned.
Common Reasons Marathon Motors Come In
- Bearing failure from contamination, misalignment or lubrication problems
- Winding insulation breakdown from heat, moisture or voltage spikes
- Bearing fluting on VFD-driven motors
- Overheating from overload, blocked ventilation or single phasing
- Water and chemical intrusion on severe duty motors
- Shaft and bearing fit wear
What to Send for a Quote
A photo of the nameplate speeds up quoting. On Marathon motors, the model number and catalog number identify the exact design. Include horsepower, voltage and frame if the nameplate is damaged, a short description of the failure, and how quickly you need the motor back.
Frequently Asked Questions
Who owns Marathon motors now?
Marathon’s industrial motor and generator business became part of WEG in 2024. See our WEG motor repair page.
Can you work on Marathon generators?
Call us with the nameplate details and the application, and we will confirm whether it is a job we can take in.
Should I repair or replace my Marathon motor?
It depends on size, age, efficiency rating and how quickly you need it running. We quote both options. See our repair vs. replace cost comparison.
Is there Marathon repair near me?
Our shop is in St. Charles, Illinois. Pickup and delivery are free within 50 miles, which covers most of the Chicago area and the Fox Valley. We also serve Rockford, northwest Indiana and southern Wisconsin. See our full service area.
What if a Marathon motor fails after hours?
Call our 24-hour emergency line at (630) 283-8433.
Related Resources
Contact
A Plus Electric Motor Repair, Inc.
3483 Swenson Ave, St. Charles, IL 60174
Office: (630) 283-3569, Monday through Friday 8:00 AM to 4:30 PM, Saturday 8:00 AM to 12:00 PM
24-hour emergency line: (630) 283-8433
Request a Marathon repair quote
Marathon, WEG and Regal Rexnord are trademarks of their respective owners. A Plus Electric Motor Repair, Inc. is an independent repair facility and is not affiliated with or authorized by the manufacturer.