I have narrowed it down to the small circle behind the hose just below where it attaches to the body of the unit, but have no idea what causes the noise. I assume it's due to a seal loss or a clog, but I cannot find it. Sound goes away when hose is removed to use attachments - returns when replaced.
After reading some other entries about similar problems, I turned to the bottom of the vacuum and where the hose starts, just behind the roller. What I found was a large Lego wedged in the opening. Removed it and we're as good as new. I actually wonder how it got in there because it was a B***H to get out. I thought I was going to break the plastic molding around the rollers, but I finally got it loose after about 20 minutes of fiddling with it. Kids!!
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Heather,Does the vacuum have a switch or a lever somewhere that makes it change from floor to hose? If so, it sounds like you've been using it on the hose selection but not actually sweeping using the hose. In other words, on an upright vacuum when sweeping just with the vacuum normally have the lever on floor setting and if you use the hose/attachments you have to have the lever on hose setting for things to work correctly. Hope this helps! Deanna
you may have a blockage in either the hose, the telescopic wand or the power nozzle/floor attachment. The easiest way to tell, as you have a new bag in there is to disconnect the hose and start the machine. If the suction is good there, start to narrow it down. Take apart the hose from the telescopic wand, take the attachment off and look through the wand. Look in the connection on the attachment as well. If not there, look inside both ends of the hose, you may need a flashlight for this, and see if there is anything blocking there.
If the hose is blocked, you can try to unblock it by turning the machine on and inserting the handle into the machine where the hose would attach to the unit. Sometimes this reverse of suction is enough to dislodge whatever is in the hose.
Unplug the machine..now if you remove the attachment hose at the body of
the vac and feel inside (to the right about an inch) their is a
"suction cover" that rotates when the wand is removed (aka using
atachments). The cover in your machine is NOT rotating correctly, so it
does not get full suction. If you do get some suction from the hose then
their is at least a 'small opening' because it has partially rotated. I
was able to fix this problem by taking a large screwdriver (1.5 feet
long, thick as a pen), inserting it into the small opening (on the
suction cover, inside to the right at the top) and forcing the cover
down all the way by lifting the screw driver up against the top of the
body opening. Seems to have corrected the problem, but may reoccur. If
you have NO suction at all then it has failed to rotate whatsoever, and
Im not sure how to correct it.
Here is a possible solution. If the vacuum sounds normal when the green light comes on, then the issue is a suction bypass. Kenmore built a suction bypass in to help cool down and protect the motor should someone either never clean the filter, empty the canister or somehow manage to clog the hose. There is a spring holding the bypass closed and is overridden by vacuum suction. I guess the spring becomes weak, allowing high suction to pull it open which in turn reduces suction so it closes again. It can do this several times per second making a loud racket and slightly affecting performance until the sensor goes green, then the vacuum suction is too low to overcome the spring tension thus why it sounds fine then. The trick? The very hard way (what I did) was to open the vacuum, open the casing where the spring is and pull it apart slightly to increase the spring tension. The easy way is to put tape over the hole where the bypass is. The inlet is under the hose track on the back on the right side as you're looking at it. The hole is about the size of a quarter and you'll see fins across the hole. The tape would keep the suction. The motor would still pull back the bypass but since tape is applied, there would be nothing to reduce the suction thus keeping performance and reducing the noise. However, this circumvents the intended design so you do so only at your own risk.
Sounds like there's a clog in the long hose that connects to the dirt canister. Remove the hose completely and check for clogs. There is a blue plastic piece that the hose is attached to. You can remove it by taking out the two screws in the back, and the four screws behind the dirt canister. Once those are removed, the hose comes away from the vacuum with the blue plastic piece attached. That should allow you to check for clogs. If necessary, take the hose outside or a place that is well lit, so you can visually verify the absence of clogs.
Check the electrical connections between the hose and the body of the machine, and also the wand connections all the way to the power head. Sometimes a faulty connection can send a false "off" signal back to the main body of the machine, and turn it off; but usually it will restart if that's the case. It sounds like you have a clog somewhere which is tripping your motor's thermal cutout, but you did say there are no clogs... so if you have full suction all the way down to the powerhead that's not the issue. You could have a faulty thermal switch, but I think the likely cause is, as usual; the sumo board.
Good luck. Sorry I didn't have a more concise answer for you.
I had the exact same problem. The port is a relief valve to prevent the motor from burning out if the hose/bag are clogged. Check the main hose from end to end after removing the 3 screws that hold it to the body of the vacuum near the handle. If that's clear then it's almost certainly clogged in the short tube that goes from the beater bar housing to the hose extension (where the flex tube attaches). There are two ways of going about this. Option 2 (the way I did it) -- Lock the base on the upright position and turn the unit over. Unscrew the 12 or so screws in the black base. You'll need to depress the release pedal when removing the screw at the end of the pedal. Once you have all of the screws removed carefully wiggle the base loose. You do not need to remove it completely to access the short flex tube. Clean it out and replace everything in the opposite order from how you removed it.
Option 1 (what I would do next time) -- Cut a wire coat hanger and make a small 1/2" hook at the end. Bend the straight section into about a 4" radius arc leaving plenty to handle at the end opposite the hook. Carefully snake the hanger down the tube and pull out the giant clump of hair and dirt that's clogging the vacuum.
Had the same problem tonight. Took the entire thing apart only to find there was a much simpler solution. Check the small hose that runs from the brush rollers where the longer hose (on the back) attaches to the side of the vacuum. Easiest way to do this is to lay the handle down and stick something (coat hanger worked good) through it until it comes out of the head. I found a pretty good sized fuzz plug in mine. As soon as I removed it, everything worked great again - and no noise!