14 in. saw with leeson motor

If your Milwaukee 6390 circular saw is tripping the circuit breaker even without an extension cord, it could be due to a few reasons:

1. Overloaded circuit: The circuit may be overloaded with too many other electrical devices or appliances. Try unplugging other devices or turning off lights on the same circuit to see if that resolves the issue.
2. Short circuit: A short circuit can occur when the insulation on the electrical wires inside the saw becomes damaged or frayed, causing them to come into contact with each other. This can cause a sudden increase in current flow, which can trip the circuit breaker. Check the saw's power cord for any visible damage or wear, and consider having it professionally inspected if you suspect a short circuit.
3. Faulty circuit breaker: It's possible that the circuit breaker itself is faulty or worn out. Try plugging the saw into a different circuit and see if it still trips the breaker. If it does, the issue may be with the saw itself.
4. Motor overload: If the saw's motor is under strain or is overloaded, it can trip the circuit breaker. Check the blade for any binding or resistance, and ensure that the blade is sharp and properly aligned.

If none of these solutions resolve the issue, you may want to consider taking the saw to a professional repair shop to have it inspected and repaired.

First of all the saw needs to be plugged in directly to a outlet . NO Extension CORD !!! If it is Right , then Check on the motor label and see how many AMPS the motor is ? You need to then check the Breaker box and make sure the breaker is big enough to handle the load of the motor on the saw . You may have to make sure that the saw is the only thing on that breaker . NO Refrigerator , A/C , ECT.
Also make sure that the motor is clean and not packed full of saw dust . This can over heat the motor and kick off circuit breaker fast .
Good Luck , Hope This Helps !!!!!!!!!!!!!!

If the motor is a 115/230 volt motor and is running on 115 volts but the wiring is configured for 230 volt operation, the motor will be weak.

How long of an extension cord are you using? Is it at least a 14 gauge wire? It should be 12 gauge. If it 16 or a long 14 it will cause the problems that you mention.

If this is occuring when its plugged directly into the outlet then it is likely a problem with the saw. Before you take it back tho try another outlet on a a different circuit.

Are you operating the saw on a 10 amp circuit or with a long extension cord? Table saws need at least a 15 amp circuit and should not be used with an extension cord. If absolutely necessary the extension cord should be no less than 12 guage. Tabel saws will run OK on a 10 amp circuit but as soon as you apply a load (try to cut wood) the power requirements go up to keep the saw turning. If you can, plug it into another outlet on a higher capacity circuit breaker or at least closer to the breaker box. If it still pops the breaker you may have bearing problems in the motor that are creating too much friction. This would make the motor work harder to turn so it would draw excessive power and trip the breaker.

Making sure the saw is unplugged ( not just turned off ) and using a pair of heavy gloves, grasp the saw blade carefully and see if it turns freely. If not then dis-connect the drive belt from the saw and try again. If he saw turns easily now and make no grinding noises then it appears your trouble is elsewhere. While the belt is dis-connected try to turn the motor my hand. It should turn smoothly but with a little resistance. If it turns ok then we must look elsewhere again.

Look at the specifications plate on the saw to determine how many amps the saw requires to run and then check the rating of the circuit breaker that trips when you turn on the saw. If the saw requires 15 amps to run and is on a 15 amp circuit then it needs to be relocated to another outlet, preferably one with a 20 or 25 amp breaker.

The 20 amps circuit breaker is there for a purpose, and changing the breaker to a higher one will warm up the wire it is connected on and will cause probably-fire!Cause the wire it is hooked on usually is #14 or #16 on most garages(I wonder why,connected to it are your water heater,washers and dryers and garage door openner).If your City gives you clearance to hook a number 12 gauge wire(or higher) for the purpose of using high amps machines then you can add at least 40 amps circuit breakers.

I assume that you are using the motor on 115 volt service. Remove the drive belt and check for excess friction in either the saw arbor bearings or the motor bearings. If both seem free to turn, then suspect that the start capacitor on the motor has failed. They usually become open circuited which prevents the start rotation. It will just sit there and hum loudly until the breaker pops. You may also have a defective 20 amp breaker--you will need a clamp-on AC ammeter to verify. Suggest that you run the saw on 230 volt service when you get it running. You will be amazed at the acceleration and apparent power available. My table and radial arm saws are both set for 230 volt operation and love it. Go to: Searspartsdirect.com and enter the complete model number minus the decimal point. This will take you to a series of drawings that list all replaceable parts. Hope this helps!

Possible bad circuit breaker. If on a ground fault sensing circuit, the saw may have electrical leakage from it's internal wiring/motor to case ground (a possible problem if you have been using a metal cutting blade)(test by using a 3-pin to 2-pin adapter [no ground pin]). The circuit breaker may not be rated for the starting load of the saw (check the saw load rating against the breaker current rating--the breaker rating should be at least 25% higher). Possible excess current draw in the saw if any of the motor windings have shorted together for whatever reason. Hope this helps!

The wrong capacitor for one thing. There are starting caps and running caps. The starting cap is in the circuit for only long enough for the motor to get up to speed. If you have a Leeson motor that has a start and run cap then the run cap may not be the correct on. If you have a start cap blowing out I suggest you check the centriifugal switch in the end of the motor. It may have welded the contacts shut. In any case, I would take it to a motor shop .