Question about Black & Decker 7448 1/3 Sheet Orbital Finishing Sander

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Black and decker model 7404 1/3 sheet sander - not orbiting

Hello, I have a model 7404 sander . ubit runs( motor runs?) when turned on but unit does not vibrate/orbit for sanding. I have taken nit apart and shaft seems in good shape and borttom(sanding area) plate with pologon seems intact .... Any ide what is wrong ... and how to fix?
Thank You
Tom L.

Posted by on

  • ckorrf Mar 22, 2009

    HOw to clean the ******? I sprayed WD40 oil and blew out every orifice but still NO vibration/movement and the motor is SMOKIN.

  • Pieter Vleeshouwers
    Pieter Vleeshouwers Dec 31, 2016 all is obsolete excenter connection worn on armature



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I read elsewhere of someone using JB Weld to fill in the pentagonal hole in the bottom plate, after coating the armature of the motor with a light coating of oil to keep the JP Weld from sticking. Assemble, and set aside for the JB Weld to set up.

Posted on Jul 13, 2010

  • 2 more comments 
  • tom walsh Jul 26, 2010

    I mixed up about 1/4tsp of steel-filled epoxy and plopped it into the pentagonal hole in the unbalanced rotating weight. Re-assembled the plate to the motor and let it sit overnight. It worked. Don't know how long it will last.

  • rcsec Aug 29, 2010

    Steel-Filled Epoxy? Cool Idea. Did you just mix the epoxy

  • Jerry
    Jerry Nov 17, 2010

    The JB Weld in mine is drying right this moment. I'll probably give it 24-48 hours to dry then I'll give it a shot. How's yours holding up after 4 months?

  • tom walsh Nov 17, 2010

    I used it for several days on the porch repair lumber. Were I to do it again, I'd put waxed paper into the pentagon on the plate before dumping in the filled expoxy. Then I could remove it from the plate readily, and sand it by hand to allow it to flex more readily. As it is, it will vibrate like crazy when you turn it on.
    I had a dab of expoxy that was left over so I could use it to determine when the hidden expoxy should have been cured.


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Wear inhibitor part number 86355 has broken on you. When this part brakes it brakes into tiny pieces which then leave the case so it hard to tell whats wrong. They don't make this part any more as the 7404 was discontinued in October 1975. I hoped this helped. I have the same problem.

Posted on Sep 30, 2009

  • chas1952 Mar 24, 2011

    i have a plastic welder. i melted some pvc plastic in the hole and while it was still hot reassembled the sander quickly. its been working for quite a while now. it was an easy fix but a little costly with the plastic welder. but it did work. it was my Fathers tool and i am kind of attached to it.

  • Jason Elford
    Jason Elford Oct 09, 2015

    Any idea what this part looked like? Was it a plastic but that essentially attacked the motor to the metal bit with the hexagonal hole in the bottom plate???


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Open the sander and simply use a nut in replacement for the broken part. It worked for me.


Posted on Jul 19, 2010

  • Jason Elford
    Jason Elford Oct 09, 2015

    How did you do this? What sized nut?


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Black and decker 7404 what sheets do i get

The standard sheets for this sander will be the same width as the bottom pad and about 1-2" longer. The sheets clamps under the clips at each end. Use a screwdriver to leverage the clamp up allowing the sheet to be inserted under the clamp and then let it down to clamp the sheet in place. On many older units, these clamps get weak over time and this can cause the sheet to slip out. By folding the end of the sheet over a time or two, this will make a small section of the sheet thicker and will help the clamp to hold it in place.

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