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

3 Answers

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.

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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.
tom

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.
    tom


  • 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.
    tom

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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.

Guy

Posted on Jul 19, 2010

  • Jason Elford
    Jason Elford Oct 09, 2015

    How did you do this? What sized nut?

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1 Answer

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.

There is also a link here http://www.ehow.com/how_8384633_change-decker-7404-finishing-sander.html to change the sheet which is basically the same thing.

The actual pre-cut sanding sheets will be advertised as 1/3 sheet such as this http://www.amazon.com/dp/B00448EZ32?psc=1

It can be cheaper to by full sized sheets and cut them down as needed as you will get more bang for the buck.

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Yes, I am on my 3rd one. Your machine has destroyed itself, and must be replaced. Sorry about that. If you choose to do so, you can take it apart and see what I mean. ( I fix these).
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could have had a bearing problem that caused the motor to cease up, It might be time for a new one unless you are handy, if so I suggest going to dewaltservicenet.com and downloading a breakdown for the tool and make note of how you disassemble it to find the problem, If it is the armature or field it might cost less to replace it.

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You need to remove the allen head cap screw in the center of the base, then remove the washer, and pull the base straight down off the sander. If you can't get it to pull off, try gently rocking it a little as you exert pressure to pull it off.

Random orbit sanding base
With this sanding base, you can use the tool as a random orbit sander.
Fitting and removing the sanding base (fig. B)
- Place the sanding base (3) onto the spindle (10).
- Place the washer (7) onto the spindle.
- Insert the Allen screw (8) into the screw hole in the spindle.
- Tighten the Allen screw using the Allen key (9) supplied.
- To remove the sanding base, remove the Allen screw (8) and washer (7).
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- Hold the tool with the sanding base (3) facing upwards.
- Place the sanding sheet (11) onto the sanding base (3). The holes in the sheet do not need
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With this sanding base, you can use the tool as a detail sander or an orbital sander.
Fitting and removing the sanding base (fig. D & E)
For detail sanding, the pointed end should face forward as in fig. D. For sanding large areas,
the pointed end should face to the back as in fig. E.
- Place the sanding base (12) onto the spindle (10). Make sure that the legs of the base
locate into the tool.
- Place the washer (7) onto the spindle.
- Insert the Allen screw (8) into the screw hole in the spindle.
- Tighten the Allen screw using the Allen key (9) supplied.

You can also view the factory manual here: http://www.dewaltservicenet.com/documents/English/Instruction%20Manual/479727-00,MS1000%20SANDER.pdf

Be patient, and good luck! Let me know if this doesn't solve your problem and you still need help!

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