Question about Black & Decker 7750 4 1/2'' Small Angle Grinder

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I can't get the wheel to my grinder loose. The locking nut barely locks. Is there any tricks to loosening it up and getting the wheel off so I can put a new and better one on. I don't know if I shouold put some WD-40 on it or what? Please help me Drew

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You should have a pin spanner wrench that fits into the holes on the lock down nut. Hold the shaft with a open end wrench that fits the flats on the shaft.
If you dont have the spanner wrench, use a drift punch to tap the lock down nut to loosen.

Posted on Jun 03, 2009

  • George Fleming Jun 03, 2009

    You should have a pin spanner wrench that fits into the holes on the lock down nut. Hold the shaft with a open end wrench that fits the flats on the shaft.

    If you dont have the spanner wrench, use a drift punch to tap the lock down nut to loosen.

    You can put so WD on it if you think it will help.

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  • 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.
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    _496.jpg_495.jpg

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    Below I included a link to the manual for your grinder.
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