Question about Black & Decker Black And Decker 4-1/2" Angle Grinder 7750 2yr Warr

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I just bought a hand grinder from a guy but don't know how to take the disc off . it has a button u push but no nut on the disc

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Repairman is right. it probably has a left handed thread which means to loosen it you have to turn the disc clock wise

Posted on Oct 22, 2012

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If there isn't an arbor nut holding the blade/disc on the grinder you have a disc with the threaded center built into it. While holding the arbor lock button down you have to turn the disc by hand until it breaks free and spins off. It may be on vary tight as it is a self-tightening thread so the disc won't come off while you use it.

Posted on Feb 23, 2012

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1 Answer

How to Change a angle grinder disc


My angle grinder came with a special wrench to take off the disk. I have a small button to push that locks the shaft. I push it gently with it UNPLUGGED while turn the grinding wheel by hand till it locks. Then I use the wrench to undo the "nut" that holds the grinding wheel on.

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Mine came with a special wrench that fits into the "nut" that holds the wheel on. Make sure the grinder is unplugged. Mine also has a button I push in that locks the shaft.I lock the shaft put the special wrench into the nut and spin it off.

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The grinder should have come with a special wrench that fits the "nut" that holds the wheel on. There should also be a button to push to lock the shaft. With the grinder unplugged gently push the button in and turn the wheel till the shaft locks then put the whrech on the nut and spin it off.

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How do i change angle grinder blade


Some units have a button you push to lock the shaft. Then you turn the lock nut with the spanner. If yours will not lock the shaft wrap a rag around the blade so you can hold it tight and not hurt your hand and turn the lock nut. It also may have a left hand thread so you could be tightening a tight nut.

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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.

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How do I tighten the nuts on my bench grinder?


A bench grinder has left handed threads on one shaft and right handed on the other,so that the grinding stones don't unscrew the nut as you grind something.I haven't ever gotten around to getting a bench grinder,but on my father's, I used to just hand tighten the nut,then grab the grinding wheel with my hand while tightening the nut with a wrench.(You don't have to make it real tight,as the wheel pushing against the nut will keep it tight)

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Hi...I have a Black and Decker 4247 angle grinder that I haven't changed the disc on in YEARS...I can't remember if the clamp nut is right hand threaded or left...please help! Thanks lots!


Which ever way your grinder spins when turned on is the same direction the lock nut has to be turned to remove it. This makes sure it's self tightening when in use. More often than not they're right-tight, left-loose.

Nov 26, 2011 | Saws

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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

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    How do you change the blade? I bought a new one but can't get the old one off. Thanks


    Krups is among one of the foremost names in coffeemakers, espresso machines, blenders and toaster ovens. Krups also makes coffee bean grinders, such as the Krups 203a. This portable, plug-in grinder has a removable lid and bean grinder chamber. The blade on the Krups bean grinder is fastened to the bottom of the grinder chamber. You may need to replace the blade on your Krups 203. The Krups 203 comes with a limited 1-year warranty, but the company recommends you send your grinder to the company to make repairs. Order replacement parts for your grinder by calling the Krups customer service department at 1-800-526-5377.
      • 1 Unplug your Krups grinder from the wall.
      • 2 Remove the grinder's lid, and use a cloth to wipe out the inside of the grinder chamber.
      • 3 Put your safety gloves on and then grasp the blade of the grinder with your channel locks.
      • 4 Use the pliers to turn the plastic fastening nut to the left as you continue to hold the blade with the channel locks. Once the plastic nut comes loose, twist it off by hand and remove it, along with the plastic washer beneath it and the old blade.
      • 5 Set the new blade in place, and replace the washer and nut. You will have to hold the new blade in place with the channel locks as you tighten the securing nut.
    Things You'll Need
    • Cloth
    • Safety gloves
    • Channel locks
    • Pliers

    In case of a problem or clarification or my solution was insufficient, don't hesitate to post me a reply.

    If you are satisfied, rate my solution with the "thumbs" or (even better) add a testimonial.

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    1 Answer

    Changing the disc


    There are two methods in changing a disk.
    somewhere on the machine you will see an arrow showing you
    the direction the disk travels when being used, the nut that holds the disk
    on always undoes opposite to this.

    normal method

    unplug grinder, use the 2 spanners supplied with the grinder.
    one will look like a normal spanner but thinner, this goes on the nut over the disk.
    the other spanner has 2 nodules which fit in the holes on the nut under disk.
    whilst holding the disk stationary with the thin spanner, rotate the noduled spanner
    in the oposite direction to the disk rotation when being used.
    on some models of grinder, a button on top of the grinder must be
    pressed in, this stops the rotation of the disk when replacing disk.
    This button performs the same function as the flat spanner.

    emergency method

    If you cannot find or have lost special spanner(s)
    pushing the palm of your hand firmly onto the disk surface and rotating
    the disk with a sudden **** in the opposite direction to that when being used
    may loosen the nut. if the nut is tight hold the disk firmly and use an old
    screwdriver in one of the holes and tap nut loose with a hammer on screwdriver.
    last resort........if possible break the disk using pliers and remove all pieces.

    putting a new disk on is opposite to method that you used to remove one.


    Oct 18, 2008 | Makita 9553NB 4" Angle Grinder

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