Electricians Help!!!

[climber11]

Howdy.

I was working on a blower assembly for my furnace today. The motor was fine.....until this evening. I was fixing a fan blade, then when I reassembled it, plugged it in, nothing turns. IT just gives off a Loud whine, like theres resistance. But, I can freely turn the motor by hand. Any ideas what might have happened???
Scott

[Doolittle]

Sounds like it may have a starter capacitor not hooked up correctly. If you nudge it (NO FINGERS or METAL) a bit with power on, does it start turning?

Sometimes ac motor bearings or shafts will wear down where as soon as the magnetic field is energized, the armature locks against the stator. Just a couple of things to consider. You didnt drop it or anything right? (thinking something may have bent).

Believe me, murphy has got a hold of you right now. It happens to me everyonce in a while. Ill be repairing something on the other side of a machine, get everything back together, power up then a few moments later 'sproing' and something completely different happens where Ive got to order up parts and spend another 4 hours fixing. Sometimes things dont like to be taken apart (I call it over wrenching).

good luck.

[awright]

Scott, give us more information on the type of motor and what you did to it when you fixed the blade. Are you talking about an oil burner blower or a squirrel cage duct fan? Have you checked that the pulley was properly tightened if it is a belt-driven blower? Is the belt still ok and tight enough? What does the "whine" sound like? (I know it's hard to describe a sound, but I don't know what you mean by "...like there's resistance.") A photo or two would help, also.

awright

[climber11]

Thanks guys.

I ended up just buying a new motor. It was the draft inducer motor and fan assembly I was working on. When I took it all apart, it didn't like being put back together again. The bearings were shot. Over wrenching! Lesson learned, the hard way as usual. Thanks to Mr. Murphy!
Scott