Question about Dewalt DC390K 18v Cordless Circular Saw Kit

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I have a circular saw that is locked and the blade won't rotate its brand new how do you free the blade?

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Its sounds like the blade lock button is depressed.
looking from the rear of the unit, you should see a button between the left side of the handle and behind the blade shield.
check that. it probably is locked in the depressed position or it may be damaged.

I hope this helps.

Posted on May 18, 2011

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UNPLUG THE SAW first!! Look for the blade lock on the top or front of the motor body, Hold the lock button down while turning the blade nut with a wrench. After a bit you'll feel the lock button engage and hold the blade firm. Rotate the the wrench counter clockwise and remove the nut, Slide the blade out from under the guard and replace with a new one. Reinstall the nut following the above procedure.

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Lost my manual for my 7 1/4 inch circular saw with laser light. Can you simply tell me how to tighten the blade? Thanks Jean


Hi Jean,
Unplug the saw.
# 1: First look for a blade break mine is at the front of the saw.
# 2: Some blades have a hole for a nail.Turn the saw blade down so that you can put a nail through so it catches on the body or Gard when you turn the wrench.
# 3: Use a nail in the gullet : curved space in front of the tooth (o<----nail 9k=to loosen just move the nail to the right side of the blade.My saw doesn't call for total tightening so it wont hurt the motor if it hangs up.If your saw blade has any blue spots it's dull and you need a new one.Thank You for choosing FixYa.com----Darryel

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Can't get blade screw off, is a circulat saw brand Rayobi.


Hi delauz1939,

You didn't say exactly what the problem is. Is it that the bolt is too tight or is it that the spindle won't stop turning?

If the problem is that the spindle turns so you can't get the bolt off, there is usually a spindle lock on Ryobi circ saws. It is between the handle and the blade guard. I believe it has a label on it.

If yours doesn't have one, like my saw, what I do is jam the blade so that it won't turn and then loosen the bolt.

If this is not the problem, please reply back.

Hope this helps. If it does, I'd appreciate your vote. Thanks,

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Some furniture shops used 7 1/4 circular saw blade for other brands of circular saw. Based on my experienced it's applicable as long their is clearance for the blade not touch the adjustable safety cover of the unit. Thanks for asking FixYa.

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I inherited a very old Fury F-7 circular saw from my Dad. It uses a 7-1/4 diameter saw blade. This is sorta-kinda embarrassing, but for the life of me I cannot figure out how to lock the shaft to replace...


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I'm not real familiar with the Fury saw, but if it requires saw blades with the diamond shaped cut-out in the center, most of the older blades had a knockout that will fit the diamond shape it would need.

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Before removing blade, notice direction of teeth.
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Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on any do-it-yourself project.
Fixya is always less expensive than a service call.

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there is a spindle lock button between the handle and the blade housing, rotate the blade by hand while pushing in on the lock buttonwhen it goes in all the way the blade will be locked in position so you can loosen the bolt with a wrench

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