Delta 34-670 motor problems

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Forum topic by Jwarther posted 01-25-2012 06:57 AM 5123 views 0 times favorited 1 reply Add to Favorites Watch
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1 post in 1735 days

01-25-2012 06:57 AM

Topic tags/keywords: delta 34-670 motor problems tablesaw

Purchased the delta 34-670 table saw on Sunday. Seller told me that the on board fuse would kick off with a second of turning the motor on. Took a $25.00 gamble on it being a fuse/ motor brush problem.
Got it home, removed the motor, took the motor apart and cleaned out the saw dust and visually inspected it. Brushes look great, lots of material left on them. The rest of the motor looked to be in good shape, no melted plastic or metal. Everything spins nicely. Reassembled the motor and checked the motor with the belt on(no load on the motor). This time it dosen’t pop the on board fuse, it runs until the 120 20amp breaker in my box pops.
Did a little reading research I find my amperage may be to low at the breaker box to kickthe motor on. So switch out the 120 20amp breaker to a 120 30amp breaker. When I turn it on, the motor runs for about 40 seconds, some arcing and flashing near the internal wires of the motor, some smoke, then it stops and kicks the GFCI outlet.
Did I buy a great paper weight? Why is the motor now running for 40 seconds and kicks off and smokes? Your input would be appreciated. John

1 reply so far

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Mickey Cassiba

312 posts in 2453 days

#1 posted 01-25-2012 01:51 PM

Uh John…the -670 is a direct drive saw…how did you run it “with the belts on”? There is very little you can do to fix this type of motor, beyond brushes and bearings. it sounds as though the commutator(the copper piece the brushes rub against is failed). You can try cleaning it up with an abrasive pencil eraser, but if the gaps(Black lines) are bridged with melted copper, it’s toast. This would call for a replacement of the armature, which if available would be pretty spendy, not too mention a major PITA. You may have found yourself a nice door stop or your new router table…:P here’s a link to the parts list:

-- One of these hammers oughta fix that...

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