Question about Delta 33 891 12" Radial Arm Saw

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Delta 33-890 Radial arm Saw 1.5 hp motor/electr. brake not workin

The Electronic brake on the motor does not work properly. It does not engage at all when you turn the motor off or kicks in suddenly.

Also, the motor is frozen when it tries to start and it seems like it is trying to over come "something" and then it will start to turn slowly and then gathers speed and then runs normally. Then when you turn it off the electronic brake does not kick in and then at some random time it may or may not kick in.

Any ideas what the problem is and how to fix it?

Greg

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A little late. I assume the motor rotates freely with no power, so the reason the motor does not start up is that the start winding is not being energized. The motor will rotate CW or CCW depending on how the start winding is connected, so if the motor runs "backwards" reverse the start winding connections.

Possibly the capacitor or bad connection. If you know how to use an ohm meter check the windings. The start winding should be the one with the lower gauge wiring. There is also a cut off switch that dis-engages the start winding after a few seconds.

There is a mechanical braking system for this motor, so it probably needs adjustment. Go to delta.com and you will find a users manual for the 33-890. I do not believe it has an electronic brake, but I could be wrong.


Posted on Sep 21, 2009

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Could be a couple problems, first the brake is it electronic or work off the field in which case the brushes could be worn or dirty and possibly the commutator needs cleaned. The startup is another issue and could be a bearing that is seizing up or has a race collapsed. I would recommend going to Dewaltservicenet.com and typing in your model number to look at a schematic on this tool before going further. Let me know.

Posted on Feb 13, 2009

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