Question about Dewalt Dw402 412" Heavyduty Small Angle Grinder

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Brush connection to grinder dw402 - Dewalt Dw402 412" Heavyduty Small Angle Grinder

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Posted on Jan 02, 2017

drseng
  • 4 Answers

SOURCE: I have a DW402 4.5'' angle grinder and do not know how to remove the blade to install a new one. Could someone help please?

The button on the top of the gearcase is used to lock the shaft only when you are tightening the nut. It is of no use when removing the nut. The DW402 was an early model and made no provision for removing the nut.

Posted on Dec 22, 2014

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Why my grinder starts well but inmediatly shots of


Could be a number of possibilities from the power cord, the switch, any possible safety devices, radio suppressor, any electronics through to the motor brushes.

A 4 inch grinder doesn't take long to take apart and this would probably be the best thing to do initially to ensure there are no obvious problems like worn or sticking brushes or poor electrical connections.

May 11, 2016 | Makita N9514b Disc Grinders

2 Answers

I have a DW402 4.5'' angle grinder and do not know how to remove the blade to install a new one. Could someone help please?


On top of the head there is a button to press to lock the blade arbor. Press it down and turn the blade by hand until it locks in place. Then you need either a spanner wrench or nut wrench depending on which arbor nut you have. Grinders usually come with whichever wrench they need. Most grinders have an arbor nut with two or four holes and require a spanner wrench with two studs that fit into two of the holes to remove the arbor nut. Some have an arbor nut with a hex fitting, like a regular nut & bot setup, that the arbor wrench fits on. If you don't have the proper wrench sometimes you can get the arbor nut off with a pair of vice grips or pliers. You will want to turn the nut in the same direction as the blade spins when the grinder is on to remove it. When you put the new blade on, get the arbor nut hand tight, it is self tightening and will get tighter as you use the grinder.

Jul 18, 2012 | Dewalt Saws

2 Answers

Hi, I'm trying to change the fiber disc on a DeWalt DW402 but after pushing the locking button on top I'm not able to unscrew the wheel. If I turn counterclockwise the wheel turns, but it seems I...


  • 1 Check the grinder before you begin. The newer discs on rotary grinders have patented buttons that allow you to remove the disc without any tools. You may have one like that. In models like this, there's usually a spot to depress and then remove the disc.

  • 2 Turn off the grinder before you attempt to remove and change the disc on your rotary grinder. If it's battery powered, put the grinder in lock position so you can't accidentally turn it on. If it's electric, unplug the grinder from the wall.
  • 3 Look for a nut in the center of the disc. This is a give away that you need to use your special wrench. Sometimes the grinder comes with a tool necessary to loosen and remove the nut. Other times you need to use a wrench.
  • 4 Lock the wheel into place before you begin. You can find a button or switch at the side or back that allows you to do that. When you lock the wheel in place, the disc remains still as you loosen the nut in the center.
  • 5 Remove the nut in the center with either the tool provided with the grinder or a shop tool and lift the disc off your rotary grinder.
  • 6Lift the disc off the rotary grinder. If you have different discs, remember to check for the best fit. Put the nut back on a different way for different discs. Check for a rim and indentation on one side of the nut and a flat side on the other. A visual inspection of the disc for the rotary grinder gives you information about the side to use.

  • Here is a diagram of your grinder and the tool you are looking for is number 50...

    http://www.ereplacementparts.com/images/dewalt/DW402_TYPE_6.pdf

    Jun 11, 2011 | Dewalt 4 1/2" Small Angle Grinder D28402

    1 Answer

    Runs slow after new brushes dw402 type 2 grinder


    I`m not quite sure of what you mean but if the brushes were not seated right it mite slow it down or you mite have a stretched drive belt. I hope this does trick.

    Aug 01, 2010 | Craftsman 6" Bench Grinder with Lamp

    1 Answer

    Makita Angle Grinder not working


    check inside for any loose connections plus check the brushes. if like you say it is smoking it could be a trip to the wheelie bin for that one.

    Jul 29, 2010 | Makita Angle Grinder 4.5" 9524NBX

    1 Answer

    Where can I find brushes for MAKITA 9557PBX 4


    The brushes for that grinder are Makita Part #194074-2. They can be found on sites like www.ereplacementparts.com.

    Mar 31, 2010 | Makita 9557PBX 4 1/2" Angle Grinder with...

    1 Answer

    The grinder just stopped working


    They are very simple inside, the only serviceable parts: if its not a switch/connection it is the motor brushes. Or the motor is defective.

    It would only be the motor brushes if you had been using it for a longtime before and they wore down.

    If it is new, return it for warranty exchange.

    Hope this helps,

    Kevin

    Jan 27, 2010 | Makita Usa Inc 9557PB 4 1/2" Angle Grinder

    1 Answer

    Carbon brush sizes


    They are exactly the same brushes. Part number 316041640 .

    Sep 15, 2009 | Metabo WE14-150 Quick Angle Grinder

    1 Answer

    Gets hot fast and wont get up to speed. Rplcd Field and Brushes


    If the field has gotten that hot to melt it , it sound like it needs to be replace as well. The heating is probably due to a short in the field.

    Apr 16, 2009 | Saws

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