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The good news is that this is a relatively easy item to remove and replace, as they make a replacement fan/motor unit (sub assembly) that you can swap out for the old one.
All you need to do is pull down on the trim vent plate and then squeeze the wire retainer clips together to remove the grill/trim.
Once you've done that, you can unplug the fan portion of the exhaust fan unit from the base enclosure. Now simply remove the screw or nut that holds the fan and mounting plate into the enclosure and simply pull it down and pivot it out of the enclosure - you might have to push in on the side of the enclosure where you removed the screw/nut to get the fan and metal plate out of the cabinet.
The replacement fans usually come with a new metal mounting plate that fits many of the older exhaust fans, but if your's looks different or doesn't work, you can remove the fan and install just the fan motore onto your old metal fan mounting plate.
Instructions are typically included in the replacement unit packages. This is also very simple to do with only 2 screws holding the fan onto the mounting plate.
Once you're done, simply hook the edge of the plate back into the fan enclosure and then push it up and fasten the mounting screw/nut onto the plate and plug the fan into the ceiling enclosure and replace the grill plate and you're all set!
Centrifugal force.....If you replaced the motor only and not the blades, the blades are likely out of balance or possibly bent. Check for wobble and to see that the shaft is fitting tight inside the blade collar.If there is a bushing on the fan blade or shf itself, check it for play as well
Hi, W/D here.
These fan motors are fairly rugged, but they do give out sometimes. I have to change them out occasionally, and here's what I do: If the unit is presentable, I don't want to change out the entire unit, just the damaged part. The fans come in a variety of sizes (the ceiling box part, that is) and it is difficult to find one that fits in the same cutout. I unplug the fan from the receptacle in the ceiling box and remove the motor and mounting bracket. I buy the economy version of the fan, or the motor replacement kit at Lowe's/similar, and mount the new motor and fan blade in the old bracket and reinstall. Total cost is ~ $20.
Best regards, --W/D--
I ran into the same problem, Lowe's carries Broan exhaust vents. They had both a replacement motor for all generations of 678 fans for $18, and they also had the latest generation of the complete unit for $40. I bought the complete unit, which included the fan I needed. Just unbolted it from the new bracket and bolted it to the old one. The new light housing, trim piece, and lens also interchanged. The existing one was old and yellowed, so this made for a huge improvement. All done from in the living space as well.
Slide the fan on the shaft. Rotate the blade so the allen screw is over the flat side of the blade and tighten it down. That's it! Be careful how far you put the fan down the shaft so it won't hit the motor or the fan shroud.
I am assuming you replaced your fan by now. However in the future call Gibraltar Industries, they are the ones who manufacture all fans and motors. My attic motor fan also died and I first called Ventamatic and they wanted $65 for a new motor. I then called Gibraltar and they shipped one our for free. 800-527-1924.
Mine was doing the same thing. I found it was coated with dust.
I took the blower out [unplugged it, and removed the single screw holding it to the box], took the face plate off [removed 4 or five screws] brushed the squirrel-cage fan blades using a narrow, long and stiff bristled brush, and reassembled it [used care to align the small plastic axle on the flap valve ] and reinstalled it. The vibration was greatly lessened and the fan was about as quiet as it had ever been.
common motor. get from butler ventamatic or Johnstone Supply if you have an account. Hint, buy a whole new fan for $60; cheaper then buying piece by piece, then you get a new blade,motor and tstat for a little more then motor alone costs.