Electronics > Beginners

Cleaning a DC motor without disassembling

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Ian.M:
He said: "I used WD-40 to lubricate the axis that is outside of the motor."    As the brushes are at the other end of the motor unless he was a total numpty and drowned it in WD40, the rear bearing, commutator and brushes are probably OK.

Jwillis:
Rebuilding larger motors I've used silicon/dielectric grease since it doesn't evaporate as much as petroleum oils/greases ,won't effect plastic parts and is far more water resistant.I wonder if it would work as well on these smaller motors .

mike_mike:
Thank you for all your advices.
I used WD40 before posting this thread.
I used WD40 only at the end of the motor, where the axis is out of the motor. I hope that WD40 did not get in the interior of the motor.
I cleaned using compressed air spray the interior and the exterior of the motor and before using compressed air I cleaned all the WD40 using a paper towel.
After cleaning, i put a drop of oil at the axis of the motor.
Are there any other things that I should do ?

mike_mike:
I put WD40 in the zone marked with the red rectangle:

Zero999:

--- Quote from: Jwillis on May 02, 2019, 08:55:05 am ---Rebuilding larger motors I've used silicon/dielectric grease since it doesn't evaporate as much as petroleum oils/greases ,won't effect plastic parts and is far more water resistant.I wonder if it would work as well on these smaller motors .

--- End quote ---
That sounds fine, as long as it doesn't get on the commutator or brushes.

--- Quote from: mike_mike on May 02, 2019, 11:22:26 am ---I put WD40 in the zone marked with the red rectangle:

--- End quote ---
Yes, that's shouldn't damage the brushes. The only potential issue is it driving out any existing grease and evaporating, but that can easily be resolved by applying a drop of  light oil, as Ian suggested.

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