7 1/4 B&D saw - blade stalls but motor continues to run
When the saw is put under a moderate to heavy load it will cut a few inches and then the blade stops but the motor continues to run without any noticable reduction in RPMs. When I back off the blade starts up again.
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Re: 7 1/4 B&D saw - blade stalls but motor continues...
There should be a special washer between the bolt (that holds the blade on) and the blade. If the arbor has a flat side on it, then the washer should have a matching hole so that the washer cannot turn independently of the arbor. Or, some saws use a spring washer which is cupped and becomes flattened against the blade as the bolt is tightened. If you have the first type of washer, perhaps the bolt is just not tight enough. If you have the second type of washer, perhaps the washer is backwards. If you have neither type of washer, you need one.
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I would suspect a combination of the two! You blade probably isn't sharp and your saws brushes are probably getting worn. The brushes are made of carbon and are pushed up against the rotor by a spring. As the brush wears down the spring doesn't put as much pressure on the brushes which means it will stop working when placed under heavy load.
I would not think so, the reset is for thermal protection and I think that you have a problem with the motor stalling or under a heavy load. I would check to see how free the motor spins with being on. UNPLUG TOOL FIRST and turn blade by hand. Then to eliminate the dust bag remove it and just run the saw without cutting. Look into the throat plate area for a build up of debris that might be limiting movement.
inside the motor/arbor section of the saw, there is a helical gear and worm drive on the motor. the front of the motor is supported by a bearing in the aluminum arbor section. sounds like most of the bearing balls are disintegrated and the worm disengages when a load is put on it but spins when there is no load. I would check and replace the front bearing.
Is the blade secure on the arbor, or is the motor itself bogging down?
If the motor is bogging down, make sure you let it come up to speed before making your cut...then let the blade do the cutting, instead of forcing it through the material. Also be sure the material is securely resting against the fence and the base of the saw, so as not to pinch in the middle of a cut.
Make sure you have a good power supply to the motor, and not a long skinny extension cord or the like.
I guess it's possible, if the saw is older or has been under heavy use, that the brushes are worn out and need replacing, but it's also possible the motor is just worn out. (Altho I have rarely if ever seen this occur.)
If you rule out operator error and power source, and the brushes are good, and of course the blade is sharp and clean, the I guess the motor must be at fault, and should be checked at a local service center.
I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread. If I've managed to answer your question or solve a problem, please take a moment to kindly rate this post....thanks!
your missing a tooth on a large round gear in the gearbox.
when the gear on the engine rotates into the position where the little engine gear spins because there is no tooth to come into contact with the engine runs but the gearbox doesnt spin, hence no reciprocation, but engine runs.
if you bump the blade it will start going again, but when you cut it will stop offasionally in mid cut. you can repair this but stop using it the engine gear will be destroyed otherwise
I have a dewalt dw303 that you can use for parts, I need a new trigger or something the motor is dead and I found a new saw. go to craigslist.org, rochester ny tools section and look for dewalt dw303 that is my listing. for ten bucks ill sell you all the gears you need. i think it is close to the same model, i am sure it is the same gearbox.
try opening your gearbox, im positive that is what is wrong.