Tools, Sharpening and Power Machinery - Sear 12 inch table saw motor problems.
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idmason60
08-29-09, 10:08 AM
I was recently was given a 12 inch direct drive sears table saw. It has some motor issues. The saw runs on 240 volt only. The saw is equipped with a blade brake, capacitor start cap and start windings,start relay,double pole,single throw on off switch. Problems: At first the motor would start sometimes right off. Then after a few times of starting it would hum and then start. Now its down to just hum: Actions on my part are as follows The cord replaced to a heavier duty one. Switches checked and wire ends replaced Capacitor replaced. Start Relay check,contacts cleaned and contacts actually bypassed over to see if contacts might have been faulty under load. Motor still just hums. I have not checked the overload kickout button. I have found some of those things flaky on other motors and maybe not resetting properly. I don't know if the motor has brushes which many saws do. If it does then maybe they are worn out. I also don't have much information about the blade brake circuit. My guess is that when power is turn off it comes on. Which would also mean if that circuit was flaky it could be on when running. If anyone has one of these older saws and has some ideas I would appreciate it.. If I don't find anything soon I may pull the motor down and dissemble it. Big job but when the saw was running it really cut nicely.. Much better then my old imported one.
Larry
Larry
idmason60
08-30-09, 12:37 PM
Ok.. rolled the saw over on its side.. one heavy sucker. I removed the motor... bench it.. disassembled it and found that lots of debris ,chips,saw dust inside. It had entered the motor and had bent up some parts of the fan. I first thought
it was ok until I put on my magnifier and looked really close at the windings, they were badly damaged and discolored. The motor is toast. The only real fix here would be a new motor which is not available now or some shade tree mechanics and adapt a regular belt driven motor and drive system. I am going to write this one off and stay with my old saw.. I got a brand new carbide blade out of the deal. I suppose if a guy had a big wood shop it could be easily converted to a router table.
It will be out for garbage man next week if anyone wants it..
Larry
S. Florida
it was ok until I put on my magnifier and looked really close at the windings, they were badly damaged and discolored. The motor is toast. The only real fix here would be a new motor which is not available now or some shade tree mechanics and adapt a regular belt driven motor and drive system. I am going to write this one off and stay with my old saw.. I got a brand new carbide blade out of the deal. I suppose if a guy had a big wood shop it could be easily converted to a router table.
It will be out for garbage man next week if anyone wants it..
Larry
S. Florida