Question about Porter-cable Vs Recip Saw/case/blade 9750 12320-5 3 x 3/16 20 TPI Wood Scroll Hook-Shank Blades, 5 Pack

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When using the saw the motor slows and then speeds up, over and over...

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That is due to different density of the woods grain soft cuts freely hard not so much plus the dullness or sharpness of the teeth makes some difference too

Posted on Apr 20, 2015

Testimonial: "Ok, I guess I should have been more specific... lol It happens when I'm not running any wood thru it. Just standing there watching it..."

  • 2 more comments 
  • Ellen Carter
    Ellen Carter Apr 20, 2015

    Yeah, that's not helpful. I guess I should have been more specific. lol It happens when I'm not running any wood thru it. Just standing there watching it...

  • ray gallant Apr 21, 2015

    then I would suspect the brushes are getting bad .

  • Ellen Carter
    Ellen Carter Apr 21, 2015

    brand new...

  • Ellen Carter
    Ellen Carter Apr 21, 2015

    brushes?

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1 Answer

Bosch 4000 table saw motor schmatic


http://www.ereplacementparts.com/bosch-4000-0601476139-table-saw-parts-c-128_167_168.html
I have found the most common issue is a bad field with the second being a bad rear armature bearing and last being a bad speed control.
Most of the time slow speed or even running backwards is a bad field (part #2 on the breakdown) #1619PA5590
Remove the cap on the end of the motor & the 2 carbon brushes.
Remove the 4 screws holding the motor to the frame and pull it straight off.
Check the bearing on the end of the armature to ensure it is not frozen or stiff. If it is also check the rubber boot that sits over the bearing and the motor housing itself to ensure it is not melted.

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I've worked on some table saws with problems like you describe, a couple needed a new speed control unit (Bosch PN 2610997306) in the motor. If all the wiring to and inside the motor is OK and not shorting out anywhere, that's the next part you should look at.

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Yes. Suggestions:
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I was cutting 2" dense foam insulation board,


The problem you have is a faulty field coil, the Bosch saws unfortunatly have a bit of an issue with this. The coil can be replaced separatly so you won't have to replace the whole motor. Bosch has a 1 yr warranty on thier table saw so this is a warranty replacment provided the saw was purchased within the year. If not the coil replacment is still cheaper than buying a whole new saw, but should really be done by a service center because of the level of difficulty of the repair.

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I inherited an older Delta 10 inch table saw. While cutting lumber the blade slows down and stops. The wood is not binding the blade. With power off the blades and motor turn freely. Does the motor...


Two easy possibilities are that the blade is dull or that the wire is too small. The wire is likely to be a problem if you are using an extension cord. You could move the saw near to an outlet that you know to be wired with 12 gage wire (not 14). Or you could buy as short as possible 12 gage extension cord. If being underwired is the problem, you will notice that the motor comes up to speed much faster when wired adequately. You might also buy a cheap new blade to rule out the dull blade problem. If neither of these fixes the problem, then the motor has become "weak" because it has overheated just enough to cause some minor shorts between the windings. (If the shorts are major it won't turn at all and will trip a breaker.) In this case the motor can be rewound, but it will probably be cheaper and easier to just replace the motor.
Good luck, Al K

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I have a BOSCH 4000 table saw which spins very slow. I opened the motor took out the field to examine. When I tried to reassemble it, I faced some problem. There are two wires from field, one connects to...


There is 4 wires from the field, 2 reds a white and a black. the reds have spade connectors on them, they go to the brush holders. The white goes to the white on the speed controler and the black goes to the black on the speed controller. There is one wire from the speed control that goes on to one of the brush leads, there is a small adapter that allows both wires to be connected. If the motor spins very slow then the field is faulty and needs replaced.

Hope this helps

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