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5 Signs Your Allen Bradley Servo Motor Needs Professional Repair

5 Signs Your Allen Bradley Servo Motor Needs Professional Repair

5 Signs Your Allen Bradley Servo Motor Needs Professional Repair

When an Allen Bradley servo motor fails, it can grind a production line to a halt. Knowing the early warning signs can mean the difference between a quick repair and catastrophic, costly downtime. Ignoring these symptoms often leads to more extensive damage to the motor, and potentially the drive system.


Here are the five critical signs your Allen Bradley servo motor needs immediate professional attention.

1. Unusual Noises: Grinding, Squealing, or Clicking

A healthy servo motor should run with a consistent, smooth hum. New, distinct sounds are a major red flag. A grinding noise often points to severe bearing failure, while a high-pitched squeal can indicate issues with the brake (if equipped). Clicking or knocking may signal internal damage to the motor’s encoder or rotor. These noises won’t resolve on their own and will only worsen.

2. Overheating and Burning Smells

While motors get warm, excessive heat is a problem. If the motor casing is too hot to touch, it’s overheating. This is often paired with a distinct ozone or burning insulation smell. Overheating is typically caused by failing bearings (increased friction), electrical winding faults, or overload conditions. Continuous operation in this state will permanently degrade the windings, leading to a complete burnout.

3. Inconsistent Performance or Positioning Errors

Is your machine missing marks, vibrating, or exhibiting jerky motion? This loss of precision is a classic sign of trouble. The root cause is frequently a failing feedback device, like the motor’s encoder. The encoder tells the drive the motor's exact position; if it sends corrupted data, performance plummets. You'll often see related "Position Error" or "Following Error" faults on the Allen Bradley Kinetix drive.

4. Visible Physical Damage

Conduct regular visual inspections. Look for oil or grease leaking from the shaft seal, which contaminates the encoder and windings. Check for cracks in the housing or connector ports, which can allow contaminants in. Also, inspect the cooling fan (if present) for damage, as improper cooling leads directly to overheating.

5. Persistent Error Codes

Allen Bradley drives display specific fault codes. While some may be reset, recurring faults (like 75.3 - Drive Over Temperature, or motor-related 16/17 faults) are a direct communication from the system that a hardware problem exists. Persistent codes after basic troubleshooting mean it’s time for a professional diagnosis.

Don't Ignore the Signs

Attempting a DIY repair or running the motor to failure will increase downtime and repair costs exponentially. A certified Allen Bradley repair specialist has the tools, software, and clean-room environment to perform a root-cause analysis, replace failed components like bearings or encoders with OEM-grade parts, and fully test the motor to factory specifications. Recognizing these five signs and acting quickly protects your investment and keeps your operation running smoothly.

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ABB Drive ABB Motor ABB Servo Motor ABB Servo Motor Repair AC Servo Drive Repair Allen Bradley Servo Motor Allen-Bradley Servo Case Study CNC Machine Repair DC Drive
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