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What causes premature brush wear on my DC servo motors?

Is the head of the brush broken or chipped? If so, then a high bar or piece of mica could be on the commutator. You will need to clean your comm and may need to rewind your armature...

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How did oil/coolant get in my motor? How can I keep oil/coolant from getting...

Knowing routes in can prevent liquid intrusion from happening again. Replace the shaft seal every time your motor is worked on...

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How can I reduce noise from my servo system?

Electrical noise can disrupt the feedback signals (especially with resolvers) and cause the drive to not perform as instructed. Cable selection is crucial...

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What is so difficult about fixing a bearing fit?

Being aware of the side effects of a bad fit will improve the likelihood that your servo gets properly repaired the first time. Broken shafts can occur where they are often missed...

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What is the best way to remove/install my heavy servo/spindle motor? How do I...

Always use one sling per eye-blot. Never loop the sling through two eye-bolts. Slings are specifically rated for certain loads. These loads vary...

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How do I prevent damage to my servo motor when removing a coupling?

Are there any setscrews or bolts on the end of the shaft? Pulling the coupling off of the shaft without removing setscrews will damage the shaft...

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How do I fix a resolver overspeed error?

Eliminating causes of resolver overspeed can reveal what needs repair. Are your cables properly shielded? Your cables should have an internal shield that is grounded...

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Why has my servo motor lost power? What do I do if my motor has lost torque?

Does your servo motor have a brake? If there is a brake in your motor then you need to check the voltage going to the brake...

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How do I disassemble/rebuild my DC servo motor?

Testing the armature insulation and circuit correctly are of utmost importance, as is the proper method not to damage windings as you separate the armature from the field frame...

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Where can I find servo motor connectors?

If you know the manufacturer of your connector, you can go straight to their site. If you can obtain a part number, cross-reference it with a replacement part number...

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How do I replace a resolver? How can I test the resolver?

Almost all resolvers have 6 leads. Use a voltmeter to ring out the leads and determine which 3 pairs of wire are circuits. Then record the resistance of each circuit...

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How can I buy a replacement servo motor for less than OEM costs?

Our technicians can help you locate a direct replacement for your OEM servo motor. If a replacement does not exist, we'll refurbish your servo motors to new condition...

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How can you determine if a repair shop is a legitimate authorized repair center?

Most manufacturers of CNC machines and by association servo motors are not interested in having third party shops repair their equipment...

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Undercutting - an important part of the repair and rebuild of a DC servo motor.

When brushes wear improperly the excessive carbon can get lodged in between the commutator bars and cause a short circuit. The only way to make a DC motor last indefinitely is to rebuild it...

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Fanuc Servo Motor Repair Part Inventory

As of two years ago this January, Fanuc reduced the number and types of parts available for sale. Some parts, even as simple as a rubber lip seal, have delivery times of 16 weeks - if they can be...

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Simple things to check before sending in your servo motor for repair

There are many simply issues that can cause a servo motor to go down. Check this list of easy to fix problems that may repair your servo...

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Fanuc Servo Motor Repair - Finding the Fanuc Motor Part Number

We get a lot of customers who call us and say, I have a Fanuc A06B Motor, can you fix that?

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