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Go to www.2helpu.com that is the dewalt site. You might have to change the link arm that moves the guard up. They get bent over time. Check other parts on the raise and lower assy for wear at the same time.
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 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
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.
OK that tool has a bearing on the motor that I think is going bad. What you need to do is unplug the tool and turn the blade by hand, it will move tight but it should move, next if you are handy remove the cover on the side where the belt is and loosen and remove the belt and turn the top drive pulley by hand or after removing the belt plug tool back in and see if still makes the noise. Before going out and buying bearings the fan bearing is a son of a gun to remove you have to crush it and remove the inner race but we will talk about that later. Let me know what you see.
Make sure the saw is unplugged. Raise the arm to the upper postions and raise the blade guard by loosening but not removing the guard screw. Depress the spindle lock button and use the provided wrench to loosen the blade screw.
A full discription, with illustrations can be found on pg 6 of the user manual. In case you have misplaced the manual here is a link to the pdf from Dewalt. http://www.dewalt.com/FAQs.aspx
click on obtain parts lists and manuals, click the highlighted ServiceNet link and enter your model number. Click the pdf icon next to manual and open the document.
You do not have to drill anything out, if you are talking about the hold-down locking pin that keeps the blade assy locked down when not in use. I have created a tutorial for replacing the locking pin, you can find it here, http://mgfic.com/dewalt708_lockingpin.htm
common problem with this saw is the brushes when worn down to about half inch, won't go into the brush holder any further and starts to arc against the commutator. eventually the heating will burn out the commutator. a replacement armature will cost you $75 plus shipping.