Has it been taken apart before? if so it wasn't put back together right.call me and i will walk you through putting it back together so it will work.i don't charge for the help just like to help people
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By the "main part", it sounds like you may be referring to the electric power nozzle? Look down the stem or neck of the nozzle as it may be plugged. You should be able to see from the opening of the neck through to the brush roll (just slightly). Be careful should you decide to disassemble the nozzle. Some of the newer nozzles can be easily destroyed by over tightening the screws.
Knowing the model would help.
Broken or disconnected wire in hose, connections, power nozzle.
Hose needs replaced. Check all connections for discoloration and cracked supports. Have power nozzle checked at a vacuum shop. Depending on the model, take it to an authorized Aerus Electrolux store for this.
Bad power nozzle motor Needs replaced.
Bad switch. Take the whole machine in for thorough check and repair..
Turn the vacuum on it's side. Pull the power nozzle end out. Unscrew, in a clockwise direction, the hose from the body/tank.
Reverse to install new hose. Screw the hose into the tank, turning counter-clockwise. Place other end into power nozzle. Ensure it's set properly.
You'll need to check if belt is disconnected or worn out. To check, disconnect cleaner from electrical outlet and disconnect power nozzle from extension wands. To remove hood, turn nozzle over and unscrew the 4 recessed Phillips head screws. Note: Do not remove the 3 screws in the triangle formation as these hold the motor in place. Please check the video for details--
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Six (6) on board/top screws approx. Two (2) in front near nozzle area and four (4) under water resevoir tank. Engage handle release and lie handle down on floor and take out screws and save (of course) You will need to also unscrew clear water cap from top of on board unit and save and make certain you retain process to put back into position..(cap/spinner/small screen /pin up) Now you have access to the pump/motor, drive belts, etc. Unscrew appropriate screws and detach water lines and note replacement points. from pump near front right area of unit. Good luck!
The 7920 is a great little carpet shampooing vacuum. Look up manual information for detailed assembly and starting/breakdown procedures. Make certain that the carpet/floor has been vacuumed previous to cleaning with the shampooer! The small nozzle opening will get clogged with as little as a toothpick or cheerio! Step on the rear release arm pedal and drop the handle down to the floor, Pull up on the resevoir bucket handle and place the handle of the resevoir back down to open the top of the tank and fill the bladder with hot water. Replace bucket top and place bucket back into vacuum. Raise the handle until it clicks into place. Fill on board soap/shampoo dispenser by lifting out of chamber on unit and fill with appropriate Bissell or upright shanpoo cleaner. Replace unit and make certain the top is tight. Plug unit in and turn on both vaccuum switch and preheat water switch and wait approx. 2 minutes to get water hot enough to proceed with cleaning. Start by rollling cleaner onto carpet and engage trigger approx 2-3' pathway away from you and then release trigger and draw vacuum /shamppoooer back over wetted area, repeat without using water again unless heavier traffic area. Do not over wet area draw unit back and forth a few times until water runs clear thru the front clear window. Proceed to make another path along side cleaned area and so on.
Once you hear the water run out or you have finished cleaning an area then shut of heater and vacuum. release handle with foot pedal release and lift out bucket and pour out dirty water and rinse area/tank /resevoir etc. You should also clean the small red filter in the resevoir of any debris by popping out and replacing. Also, there is an onboard filter under the clear window (where spinner is located) . unscrew clear top , take out spinner device and pull out small plastic screen and rinse or blowout. Clean also the front clear cover if there is debris, by rinsing off with sprayer or wiping clean. You may also find that you have to take off the clear plastic hood window, by unscrewing two screws on either side of nozzle opening (top ) and rinse out as well. Do not, get water under unit into motor area. Place unit upright and in a warm place.. Do not let freeze if in climate that is known to freeze. Good luck cleaning!!
Nozzle Clean Out tool is NO LONGER AVAILABLE from Hoover. Hoover stopped making this part over 1 year ago, and it's not sold any more. What you'll need to do is remove the dirty solution thank, unscrew the one silver screw on the suction port of the clear window, then turn the machine upside down and remove the two silver screws on the bottom corners of the see thru window. This will then allow you to completely remove the see thru part to clean inside of it. Unfortunately with this model that's really the easiest way to do it now that the tool is no longer available.