How to change a blade in miter saw - Makita LS1013FL 10" Slide/Compound Miter With Laser and Light

Remove centre bolt on blade anticlockwise.Blade will have to be stopped from rotating.Blade will slip out of carrier.NB note direction of blade for refit.

See page 9 of this manual: http://documents.milwaukeetool.com/58-14-6955d3.pdf.

The manual is for a 12 inch saw, but the instructions will be similar. UNPLUG THE SAW FIRST!

I would remove the blade and try the saw again, there is a possibility that you might have gotten a flange on incorrectly or left the spacer out.

I don't know if this will help you much but I've got a DeWalt 14 inch chop saw and a 10 inch miter saw and they both have a small lever on the right hand side of frame just behind blade If you depress this lever and slowly rotate blade until it drops into place this locks the blade for changing. Hope this helps you. Thanks.

With the saw unplugged, push the spindle lock in on the motor side of the saw (a short black rod) while turning the blade by hand. The spindle lock will seat and hold the blade still so that you can use a wrench to loosen the nut that holds the blade on. Use the spindle lock again for tightening a new blade on the saw.

Exploded diagram for your SM100M miter saw is here.
User manual is here.

Page 20 covers blade change operation.

Make sure you unplug your saw! You need to remove a screw from the cover and rotate the cover to the rear. Use a hex wrench in the motor shaft to keep the saw blade from turning, and loosen the arbor nut with a 1/2" wrench. The arbor is reverse threaded, so you'll turn it clockwise to loosen, then counterclockwise to tighten it up after you have swapped the blade.
Rotate the cover back after that's done, and replace the screw.

If this was useful, please vote. Thanks.

there is a nut holding the blade in the center , it is left handle thread , there should be a locking mechanism to hold the blade while you unscrew the nut

Have you removed the old blade yet?

The blade lock my be broken off -- it should be a button on top of the motor.

This saw has left hand threads -- turn clockwise to loosen the bolt/nut.

If you can't find the blade lock, lower the saw onto a piece of wood llike a 2x4 to keep the blade from turning.

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