Question about Skil 7 1/4" Magnesium "Mag 77" Wormdrive Saw With Twist Lock Model # SHD77M 72

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Where is the blade lock button on a skilsaw 5150 2 1/8hp ???? i can't get the blade off and turning the saw bolt the same direction as it spins isn't working.

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First, there is no blade lock button on the Skil model 5150. I called the Skil customer service and they emailed me the exact manual for this circular saw. The method I used to loosen a VERY TIGHT blade stud was: spray with WD-40, imbed the blade in scrap wood, set Skil wrench (usually found in back of foot under handle) on so it could be struck going in counter-clockwise direction. Use hammer to strike handle of wrench a couple of times. To replace blade, finger-tighten blade stud, then use wrench to tighten 1/8 turn or (45°).

Posted on Nov 12, 2010

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I'm not familiar with that particular saw but I had a circular saw with not blade lock. The instructions suggested I use an box end wrench on the saw bolt and firmly and quickly spin the wrench forward (toward the front of the saw) and let it bang or slap sharply on the surface you have the saw sitting on. Several attempts like this will use inertia to jog the bolt loose. If that doesn't work you may have to buy a specialty thin or flat wrench to fit behind the blade (between the blade and the motor) to to hold the armature while you loosen the bolt. The flat wrenches are available at the Ace Hardware in our area, maybe yours too.

Posted on Jun 27, 2009

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I have that saw just stick a screwdriver into one of the teeth perpendicular to the blade and when you tighten the bolt it will keep the blade from turning works like a charm .

Posted on Jul 07, 2009

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1 Answer

How to change blade on skilsaw 5380


on a circular saw
pull the power lead from the plug
using a screw driver , place the blade between the teeth and turn until the screw driver is jammed under the plate
use a ring spanner and undo the nut that holds the blade on
pull the blade out and fit the new blade with the direction arrow in the right direction
replace the plate and the bolt do the bolt up tight
rotation will tighten it up
some blades have a hole in the blade in which to insert the screw driver to hold the blade , or a lock lever behind the cover to hold the armature shaft while changing the blade

Dec 21, 2016 | Saws

2 Answers

How do you lock the blade to change it on a skilsaw model 5500


generally you put a screwdriver thru the hole in the saw blade and rotate blade until it stops against something and then remove bolt that holds blade on.

Aug 10, 2015 | Skilsaw 5500 Circular Saws

1 Answer

How to remove arbor bolt to change blade


Best thing to do is to just rest the blade teeth against a peice of scrap wood, and use the allen key/spanner to undo the bolt. As the bolt undoes in the direction of the cut, the blade teeth should dig in and stop it turning. If the blade lock isn't working anymore, it could mean that it has broken inside, so be careful, incase there is a bit of loose metal in the gearbox, it will be quite catastrophic if it gets caught in the gears.

Jul 18, 2014 | Bosch 7 - 1/4" Skilsaw Circular Saw

1 Answer

Center bolt spins freely


There was probably a hole in the flange that you discarded that was used to put a pin/ nail/ bolt/ etc in from the body of the saw to hold that flange from turning while you did the nut up. Unless that hole is there you will have no way of holding the shaft to tighten the nut.

Jul 27, 2013 | Skil 7 1/4" Magnesium "Mag 77" Wormdrive...

1 Answer

I've borrowed a circular saw (v old B+D 1 HP model). Can't loosen spindle bolt to remove blade: the blade is locked with a pair of locking pliers against the guard, but when I turn the spindle bolt...


you just have to look for little button close to blade, smash it, hold it while you move the blabe till gets stuck then you're ready to loose the blade! hope this help

Jul 24, 2011 | Saws

1 Answer

I do not remember how to assemble the blede & associated parts. Also the direction the blade teeth should be facing


The blade should be installed with the teeth tips facing the front of the saw. Place the blade on the arbor shaft, then the blade washer and then thread the lock bolt in the arbor.

Please go to this site and download a copy of the manual for your saw. Just enter your model number. Power saws are dangerous and you should refer to the users manual for safety info before using. I hope this helps.
http://www.boschtools.com/service/productservices/pages/manualsandpartsdefault.aspx

Jul 03, 2010 | Bosch 7 - 1/4" Skilsaw Circular Saw

2 Answers

Blade change skilsaw 5150


The locking button on this saw is designed for safety. If you are attempting to change the blade it should NOT be plugged in. It sounds as if someone has pushed the lock button while the motor was running and sheared it off.
The only tool that is required to change the blade is the supplied wrench or an equivalent box end. If you cannot make the repair yourself for have the equipment repaired you can take a pair of vise grips. (Use cardboard to prevent warping or gouging the blade) and clamp the edge of the blade below the teeth. The vise grips will stop at the front of the saw as it is too large to pass by the guard allowing you to loosen the nut. Clamp the new blade in the same way only the back of the saw will be used to tighten.

I highly recommend that you either repair yourself or have the tool repaired by a professional.

Parts schematics are all over the net for this tool, here is an example:

http://www.toolpartsdirect.com/cgi-bin/schematic.cgi/skil/5150

As you can see most of the mechanical parts are only a few dollars and it could save you from serious injury during operation.

Feb 13, 2010 | Bosch 7 - 1/4" Skilsaw Circular Saw

2 Answers

Where is blade lock


Well it kinda depends on the model number. If you go to www.ereplacementparts.com they have parts diagrams just enter model number and you should be able to see exactly where its located.

Feb 07, 2010 | Bosch 7 - 1/4" Skilsaw Circular Saw

1 Answer

How do I replace a skilsaw blade?


The saw has a bolt in the center of the blade. The saw blade will have to be held in place, (so it can't turn), while the bolt is being loosened. Pay attention to the rotation direction, as your replacement will need to rotate in the same direction. Once you have removed the bolt, there is a centering spacer that fits between the bolt and the blade, remove it paying attention to how it fits..you will need to put it on the new blade in the same manner. You can now remove your blade and replace. Good Luck. I hope this is very helpful!

Nov 14, 2009 | Craftsman Saws

1 Answer

How to I change the blade on a skilsaw cicular saw?


The blade is USUALLY held by a LEFT HAND thread bolt. Sometimes they have a diamond insert in the blade that must be removed if the saw has a matching boss on the arbor. If the saw has that, you punch the insert from the blade and engage the diamond over the boss on the saw then put the clamp washer on top and then install the bolt.

OFTEN there is a button near the blade are to push in to "freeze" the arbor so the bolt can be removed/installed. These are USUALLY left hand threaded bolts.

Sep 14, 2009 | Bosch Saws

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