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Is there a nameplate on the old motor? If so, it should state the HP, speed and direction of the original motor. If not, a 1/2 HP to 1 HP 1750 RPM motor with the same size shaft that will turn the blade the same as the original should work fine. From the online manual, it appears to have an internal start switch, so the wiring should be standard.
There should be 2 or 3 knobs/screws on the side to adjust torque to lift and to let down the door. Sounds like you need to increase the lift torque setting. If its maxed you can try greasing the rollers/wheels to help remove the drag. If still does not lift it then you may need a bigger motor (1hp) or you can add some springs to help lift it. Check your sensors too. Make sure they aren't being tripped at 6" up.
If you still have the old motor, use the info off of the motor label that describes the mounting configuration (this is the frame type). Do a google search for "Electric Motor NEMA Frame Sizes" for a good list of them. If your label is unreadable (or missing) search for the owners manual for your tablesaw - they usually have the specific motor model number.
The motor frame type is all you really need for making sure it will fit your saw - however, if the old motor was a 1 hp, and you install a 5 hp - you may have problems with the size of the motor hitting the table saw.
Also, decide if you want 110 or 220 volts. In general 220 is more effecient (3 phase is much more effecient). But I bet you'll want to stick with the original horsepower and voltage.
Then, do a google search for your motor. The frame for my motor is J56HC, it's a 3 hp and I use 220 volts - so my search is usually just "electric motor frame J56HC", but if I find too much garbage, then I search "electric motor frame J56HC 220 volts 3 hp". Once you find a motor model number (the motor I liked was a leeson 115048) then search for that. I found a great deal on ebay searching for this.
I'm assuming your saw is a model 351.228040 or a 351.228020. Manual is here. See page 18, Figure 7 for the Blade drive exploded diagram. Sears doesn't appear to have a part number for the fan and fan guard.
It looks like you can replace the entire motor and key for $217.55 (as of 6/13/2010) which isn't too bad for a 3 HP motor. Part number is 15094.00 and clicking it will link you to their parts site.
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Go to midlandhardware.com.For about $4.00 more than just price ofthe motor,you get the complete saw 15amp.motor with a laser guide!The table saw has a 3yr. warranty,3 extension wings,and a sturdy stand.Shipping to your door $24.00,$198.58 total.
SOUNDS LIKE THE PROBLEM I HAD, BUT WAS JUST A SEIZED-UP BEARING. I WENT TO LOCAL ELECTRIC MOTOR REPAIR ($15.74) PARTS AND LABOR, THEY REPLACED THE BEARING, THERE ARE 2 BEARINGS ON IT, COST IS THE SAME FOR EACH. THE BEARING IS PRESSED ON, SO REPLACEABLE. HOPE THIS HELPED
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