Question about Oster 76076-010 Hair Trimmer

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Oster 76 overheating

I recently replaced the carbon brushes on my Oster 76, as I have done many times before. This time, after turning the clipper back on, it worked but it had a high-pitched whine and I noticed that it ran more slowly and little to no air was blowing out of the side vents. After just a couple of minutes, the clipper was almost too hot to handle.

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The most likely cause of the condition you describe is that the motor is trying to run with too little current reaching it. ( Note: Voltage is the pressure pushing the electricity down the wires. Current is the amount of electricity being pushed. An easy analogy would be gallons-per-minute of flow through a garden hose. That flow is the current that is being delivered. )
If there is a built-up coating of black residue/gunk on the commutator ( the part the brushes ride against inside ), you're probably not getting the full amount of current flow needed to run the motor. Any motor will run slow, overheat, and eventually burn out if operated on current flow that is less than that required by the unit. Too small a cord, too long an extension, dirty contacts, any of these things can restrict current flow.
Pull the brushes out and look down inside. If the armature is covered in black residue, the only fix is to clean, polish, and undercut the armature, or simply replace it.
These are well-built machines, and designed to be servicable. That said, I must caution you not to attempt this repair/replacement if you have no experience in this area. It's all too easy to end up with a unit that doesn't work at all. Even worse, a unit that goes POOF and generates a cloud of acrid smoke !
Time to turn to your local repairman. It isn't a difficult or especially time-consuming job, and should be quite affordable.

Posted on Mar 15, 2009

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