The correct belt is a 38528035. If the belt does not have this number printed on it, it is a generic belt and probably the wrong one. The pulley on the transmission is "convex" because this pulley design keeps the belt running in the middle. (a belt will always try to "climb up a hill") If the motor shaft and the pulley are not aligned properly, the belt will constantly throw off. This can be a result of a bad motor mount (located inside the motor compartment.) The motor shaft end has a rubber cover that absorbs vibration and keeps the motor positioned squarely. The handle could also be loose on the pivot. It is held down by two metal clamps that screw securely to the bottom, holding the handle on to the base and allowing for the handle to pivot backwards. This problem can be difficult to diagnose and I have had many in my shop for repair. It takes a seasoned and experienced repairman to find a solution to this problem, in most cases. The disadvantage I have here is that I cannot see your machines to inspect all the various things that effect the belt alignment. I hope that some of this information will help.
There are really two reasons why the self-propelled wouldn't work. It could either be the belts on the vacuum cleaner are stretched or broken. The belts on this model control both the self-propelled transmission, as well as the brush roller. Here's a video that shows you how to inspect the roller brush and belts to make sure that they are installed properly and working. Try this repair first, as this is the easier one to fix.
The other problem if the belts are installed properly that would cause the self-propelled wouldn't work would be the self-propelled actuator arm. There is a cable that starts at the handle of the vacuum, and runs all the way down to the floor head of the vacuum that controls the transmission. As you pull backwards on the handle of the vacuum, the cable pulls this actuator arm backwards, which then turns the wheels backwards, and when you push forward it turns the wheels forward.
The problem with the way it's designed however, is that if you pick up the vacuum cleaner by the handle of the machine rather then using the carrying handle on the back of the vacuum, it causes too much tension on the actuator arm, and will cause the cable to rip right out of the arm.
This is a VERY common problem on this model. To check and see if this part is broken on your vacuum, step on the handle release pedal so that the handle is in the vacuuming position, push the pedal a second time so the machine lays flat on the floor.
Now if you look right behind the height adjustment switch, and the rug / floor switch where the floor part meets the upright part, you should see a cable that connects into the actuator arm. Pull up and down on the handle and look for movement. Is the cable loose with only a nut attached to it, or is it resting in the actuator arm?
If this didn't help you, and the problem is still happening, please just use the add a comment form here on Fixya and let me know that you're still having problems. I'd be honored to go through and do some more advanced diagnosing with you.
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This is a pretty clear indication that your filter is clogged and needs to be replaced. HEPA filters are different then say pre-motor filters, or sponge filters. Because they are usually the last filter before the air is exhausted, it's usually catching very tiny microscopic particles. Because of this, trying to determine if the filter is dirty or clogged can be difficult, if not impossible on HEPA pleated exhaust filters.
The fact that your filters continues popping out, indicates that the air is not being able to pass through the filter as it's supposed to, and is instead the air is having to try and find a different way to escape, causing the force of the back up of air to blow the filter out.
I think if you replace this filter, it should fix the problem completely. Because this filter is designed to capture microscopic particles rather then large particles, washing this filter, or getting it wet is not advised, and wouldn't be an effective way to clean it. You really will need to replace the filter soon, but if you'd like to try and prolong the life of your filter, you may use an air compressor, and blow from the top of the filter (the area that looks clean), and clear the microscopic particles, and dust out of the filter this way. If you suffer from breathing issues, asthma, or allergies, I would highly advise against doing this without a mask on. The dust that will come out is extremely fine dust that can cause people with the above conditions to suffer greatly. Doing this outdoors is highly recommended.
An air compressor can certainly prolong the life of HEPA filters, but again, sooner or later you'll need to replace the filter.
If you're in need of buying one of these filters, you're in luck! We carry these filtes on our site, and they are in stock. Here's a link back to the filter on our site if you need to order one. We offer free shipping, 60 day returns, free return shipping, and no restocking fees. Please feel free to reply to this solution by using the comment box at the end of this solution. If you found my solution to be helpful, please be so kind and rate my repair, or leave feedback for me. This is greatly appreciated by the FixYa community, and is really what keeps repair professionals like myself to keep answering free questions, and not just the premium questions which we get paid to answer.
If you have a wax finish you can buff out scuffs with just a cloth. for polyurethane, do not use water. use the cleaner with a soft terry cloth. to much presure can make it worse.you can also use a small amount of paint thinner on polyurethane. make sure you remove excess with floor cleaner.