Is the thread that holds the blade in left handed or right? I can't get the screw loose!

It will be right handed normal thread screw.

#1) You have to locate the blade release button on the saw (see your manual). The opposite side of the release button is a screw-like OVAL shaped PIN. To insert the blade, the direction( or position) of this OVAL shaped PIN has to match the OVAL shaped hole in the blade. You could use a screw driver to change the direction/position of this OVAL shaped pin. You have to push down the release button when you use the screw driver to turn.

#2) Hold the blade in Vertical position in your right hand. The "Oval" hole is on top. The teeth is facing your left hand. You will see that the "oval" hole on the top of the blade is a "horizontal" oval.

#3) Hold the saw (handle) in your left hand as if you were going to saw using your left hand.
Now peek through the hole of the saw and find the direction of the OVAL PIN. It has to be a "horizontal" (or lied down) OVAL. If it is not, use the screw driver to adjust it.

#4) Hold the blade using your right hand. Oval hole on top, teeth facing your left hand. Insert
the blade from the bottom of the saw. What you needed to do is to insert the PIN into the hole
of the blade. When you inserted the pin into the hole of the blade, slowly turned the blade upward, the blade will lock by itself.

Sitting on mower, Right hand blade has left hand thread bolt. Left hand blade has right hand thread bolt. Hope this helps.

Remember that on a circular saw, the bolts are typically left-handed thread so it is the opposite of a typical bolt. This is because the blade spins to the right so if a normal bolt was used it would loosen as the saw operates.

hi there winger1886

pauly46 here


with 20/122 the blade timming must with one blade vertical and one blade horizontal
doesnt matter which one but as long as there is 90 degrees between blade as the rotate
in the picture the r/h blade rotates anticlockwise and the l/h blade rotates clockwise

the picture for belt / blade timming is straight forward - loosen tensioner rod and back it off completely , loosen 2 x bolts under the two toothed pulleys and remove the 2 belt guide/ stoppers from the l/h side - place both blades in the rqd position ( you may need someone to hold other blade in rqd position - fit the belt onto pulleys as in the diagram- continually check while fitting that timming has not moved from where you placed them ( they have to be 90 degrees from each other ) and then tighten the tensioner rod to hold position - rotate by hand recheck timming - if good loosly fit guide the 2 guide stoppers to l/h side and place 3.5 kg of tension at the middle point of the longest run of timmed belt ( belt should only deflect 10 mm with 3.5 kg of tension )
once tensioned tighten the 2 bolts under the toothed pulleys and tighten loc nut on adjuster
tighten the 2 stopper / guide nuts

in the picture the left hand blade is a l/h thread undo it right and tighten it left

the blade on the right is a normal thread left loose - righty -tighty

cheers hope it helps

Removing the Blade
1. Unplug the saw.
2. Raise the arm to the upper position and raise the lower guard as far as possible.
3. Loosen, but do not remove guard bracket screw until the bracket can be raised far
enough to access the blade screw. Lower guard will remain raised due to the position
of the guard bracket screw.
4. Depress the spindle lock button (Fig. 3) while carefully rotating the saw blade by hand
until the lock engages
5. Keeping the button depressed, use the other hand and
the wrench provided to loosen the blade screw. (Turn
clockwise, left-hand threads.)
6. Remove the blade screw, outer blade clamp, and
blade. The inner blade clamp may be left on the
spindle.
Installing a Blade
1. Unplug the saw.
2. With the arm raised, the lower guard held open and the
guard bracket, place the blade on the spindle against
the inner blade clamp with the teeth at the bottom of
the blade pointing toward the back of the saw.
3. Assemble the outer blade clamp onto the spindle.
4. Install the blade screw and, engaging the spindle lock,
tighten the screw firmly with wrench provided. (Turn
counterclockwise, left-hand threads.)
5. Return the guard bracket to its original position and
firmly tighten the guard bracket screw to hold bracket
in place.
WARNING:
• The guard bracket must be returned
to its original position and the
screw tightened before activating
the saw.
• Failure to do so may allow the guard
to contact the spinning saw blade
resulting in damage to the saw and
severe personal injury
you can download a manual at: http://www.dewalt.com/tools/machinery-miter-saws-dw713.aspx

Is definitely a left hand thread on the bolt...your machine came with a small rod to hold the head while loosening or tightening the nut which holds the blade....there is a hole and a slot in the machines head to insert the rod....if you've lost it you can probably use a small piece of drill rod about 5/16 diameter or a drill bit to hold it ...turn nut in clockwise direction and it will probably come loose....good luck !!! ;-D

If a blade, when viewed from above, rotates clockwise, it will have right-handed threads. This is because the shaft is turning to the right, and the resistance imparted on the blade will tend to tighten a right-handed fastener. If a blade rotates counter-clockwise it will have a left-handed fastener. I don't know this mower, but this is a universal thing.

OK first raise the cutting head. Loosen the screw that holds the guard in place and move out of the way. Find the spindle lock on the right hand side of the gearcase and turn blade by hand (UNPLUG SAW FIRST) until it locks. With the wrench supplied with saw put it on the blade bolt and turn it clockwise to loosen, it has left hand threads, remove outer flange and blade. Let me know it you need any more help

The bolt is counter clock wise (standard thread), use a screw driver to jam the blade