Motor not working on Delta table saw: I just got a used Delta table saw for free, the previous owner said the motor wasn't working. I wonder if it could just be a switch... how could I check that? I also wonder if I could just replace the brushes... again, how would I check that? Finally, if I do need to replace the motor, what do I need to do? Saw is a direct drive (no belt).

Has it just started or been an ongoing problem, If you are using extension cord use a 12 AWG cord The orange or blue store sells them. The switch nay be bad. You can have the motor rebuilt at a motor shop if necessary. Personally y I would do cord, then switch.
While you have switch box open check the wiring.
Here is a link for parts,
https://www.ereplacementparts.com/delta-365152-left-tilt-contractor-saw-parts-c-3275_3334_418338.html

since the replacement motor is $255.00 you will have to decide. The motor is sold as complete no parts
https://www.ereplacementparts.com/delta-36600-type-table-saw-parts-c-3275_3334_9584.html

There could be several problems. First, make sure you have a sharp blade. Then check the arbor for drag just after you have been using it. Unplug it, lift the motor a bit (to loosen the drive belt) and turn the blade with your hand - it should turn very freely. Check the motor shaft for drag too by turning the motor pulley with your hand (with the belt loose). The motor should have just a tiny bit more drag than the arbor shaft. If all of these check out ok, then you might have an insufficient gage of wire between the electric panel and the saw - a thin wire long extension cord is often a problem. If you are using an extension, try to eliminating it and plugging directly into the wall. (It depends on the length, but in general don't use a cord lighter than 14 ga - higher numbers mean skinnier wire). And it could be that the house wire is too light - a long run of 14 gage wire is too light - you want 12 gage wire and a 20 Amp rated outlet. If all of these are not the problem, then you have a bad motor that is partially burned out (that is, the insulation on the coil windings has melted and the coil wires are shorting out resulting in coils with a lot less turns than the motor was designed for. You can replace the motor or get it re-wound. Good luck!

If the motor is using a single phase supply there will be a capacitor which could have reduced in value- open.
If so try and use a capacitor in parallel to see if the motor works-- in this case the motor might hum and get heated up.

Check nameplate on motor for amp draw, and then check that against your breaker and wire size.
http://waterheatertimer.org/Color-codewire2.html

If table saw worked on the breakers before and suddenly stopped working, then see if you can lubricate motor bearings >> look for oil cap on each end of motor and use 3-in-1 oil.
Clean the saw and make sure there's nothing rubbing against drive belt and that saw blade rolls easily when saw is turned off.

If you have a motor with the no.1313314 and the motor runs ,but the blade spindel does not turn try removing the backcover plate . With this removed you might find that the toothed gear belt has broken. If this ,in fact, is the problem the belt is a Bando syncro,link 100xl.
Hope this rectifies your problem as I am waiting for a new belt myself.

E

There are lots of things to adjust. In case you don't have one, here's the manual-- http://www.dewaltservicenet.com/documents/English/Instruction%20Manual/Delta/A22365,33-890.pdf

If you didnt replace your switch ... do so now. If you did replace the switch, check your work

you have to use a meter and check the voltage at the switch and to the motor.

I have a table saw that the cord from the motor plugs into the the back of the on/off switch. I yours is configured like that, unplug the motor cord from the back of the switch and plug it in to the wall and see if the motor will run. If so replace the switch.