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Order Slider Release (7.93, vacpartswarehouse) Pull off 'tank.' Remove 3 Screws for Foot Detent Lever. Pull off. Remove old slider release and spring (verify it's broke.) Replace with new. I just did this today after a year of dealing with it.
I just successfully completed this replacement on a DC33 (the prefilter catch is blue on this model.) Not sure how different the assembly is from the DC07 but thought I would post:
If you turn the vacuum over there are two screws that loosen the exhaust pipe--one you can see and one up a small shaft (which also loosens the cowling just under the cyclonic assembly.) Both will require a driver or allen-style wrench with a medium-sized star head. Remove both and you will be able to take off the exhaust pipe. You'll need to pull back the aforementioned cowling a bit as you do this.
Once the exhaust pipe is off you will be able to see the bottom of the prefilter catch. You'll notice five tiny bays--if you shine a flashlight through you'll see that between bays 2 and 3 there is a small catch (you can note it at the bottom of your replacement prefilter catch as well.) Shove two extra small screw drivers (like the size you get in eyeglass repair kits) into bays 2 & 3, then gently press down on the driver handles to release the catch. A little pushing at the same time will remove your broken prefilter catch.
DON'T INSTALL YOUR NEW CATCH YET! Otherwise, like me, you'll have to immediately remove it to reinstall the exhaust pipe :) This was the most time consuming part of the whole operation, as you kind of have to fenangle it a bit to get it back on. Be patient and don't forget to pull the cowling back again while you're doing this. Once it's back on, realign the cowling at the top of the assembly and replace the screws. Then you can turn the vacuum upright again to easily snap in your new prefilter catch.
With most vacuums it's not necessary to completely dissassemble to the motor. Most rattles are either something stuck/jammed in, around the wheels and intake area. The rattle, if it's a knocking can also be the internal broken rod of the roller. Rollers can be purchased at hardware stores. Even Walmart and Target carry many models. There are screws in the back and front and guide tabs that the housing cover slips into in the front to remove the top cover as a last resort.
Try cleaning maintence 1st.
1) Unplug 2) Flip over and remove screws on the belt and roller face. Remove face-expose belt &brushes. 3) Slide brush out of grooves. If the belt makes you nervous, slide a large screw driver through it's loop to hold in place while you clean the roller. 4) See if the belt is in good condition free of cracks or tears. If it needs replacing, it slips over the motor spindle for simple change outs. The belt and roller part number should be listed on the vacuum if you look atround. Usually on a metallic plate installed during manufacturing.
You can take a 4' length of old garden hose and listen through it to the outside of the motor while running to see for sure if the noise IS coming from the motor, or infact it's the roller. I hope this helps you.
A loud rattling/thumping is usually a broken internal roller support rod. You can check by: UNPLUGGING the vacuum, flipping it over, taking the screws out of the roller brush cover plate and removing the plate. It goes back together the same way. If you are nervous about taking it apart, take phone pics step by step as you go so you can see exactly how it came apart for re-assembly. After removing the plate you will see the belt. Pull the roller forward, it will slide out of it's grooves and come out. Slip the roller out of the belt & shake it. It shouldn't rattle, if it does..it's broken inside. Many parts are available at Walmart. If the belt comes off it just slips back on over a metal pin further in the back-you can see it. Use a flat blade screw driver to slip it back on. Slip the new or old one back unside the belt, then back into the grooves till in place. Then the cover & it's screws. You should be back in business!
If you push inwards on each side of the light cover on top you can remove it. With the light cover removed remove the (2) access screws. Now you will be able lift of the entire top cover from the base. You will then see the belt and roller brush, remove the old belt and replace with a new one. You can get the replacement belt you need here:
The rod must be your brush roll. it should just pull out, Have you removed the cover over the brush roll? When you do get the brush roll out, turnb the ends and make sure they turn freely, if nit, replace it also.
Flip over the vac and use a long skinny screwdriver to spread the tabs that capture the two nubs on either side of the lever then pull the old part out. Then simply align the new part, and press it down into the slot till it clicks in place.