Question about Hoover U6660-900 WindTunnel Bagless Upright Vacuum

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Valve actuator, arm & spring assembly

This vac had no suction when in the upright position. The rear valve arm was broken (P/N 37819048) I got a new one and can't make any sense out of how this goes back together. I understand how the mechanism is SUPPOSED to work, but the parts diagram does not show how the spring fits in. Any help or pictures of how it should be assembled?

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  • RicksterNPam Feb 16, 2008

    Yep...that sounds exactly like what I had figured. It isn't easy loading the spring while twisting the two pieces into the correct orientation. In fact, I wore leather work gloves because I didn't feel like a trip the ER for stitches if something let go in the process.

    Anyway, once I got it all back together, there was no way for the door to return to the closed position when the unit was returned to the upright position. I figured there was a missing spring somewhere...and low and behold, if you look at the front tip of the actuator arm there is a small hook for a spring...and looking at the bottom of the floor housing there was another hook. I got a spring out of my "drawer of springs" and put one there and it all seemed to start working right. Could it be possible that the mechanical parts diagram overlooked this spring?

  • edru Feb 16, 2008

    I replaced the valve arm and it is still not springing back up. I am having the same problem. I also think there must be another spring to make the arm pop back up. Any suggestions as to why after replacing the rear valve arm it is still not working properly? I may end up trying the the spring suggestion along the bottom.

  • RicksterNPam Feb 17, 2008

    Now...don't everybody laugh at me, but I sent Hoover customer service an inquiry regarding the parts diagram and asked if they may have omitted a spring. The spring around the valve arm is doing what it is supposed to, however, it has no way to return the door to the closed position. I'm guessing that when the spring comes off, the vacuum sucks it up and you never realize you lost it.

    Oddly enough, there is very little vacuum being produced even with the door functioning properly now. I'll never buy anything from Hoover again....this is the 2nd time....the carpet shampooer isn't any better.

    I'll post back if I get a response from Hoover.

  • RicksterNPam Mar 01, 2008

    I said I'd post back...and goes: Hoover sent an email telling me to contact a local technician. Surprised? I called the local tech and he sent me the same diagram that I've found everywhere online. Anyway, after playing with this some more, I realized that the surface on the body of the unit that presses down on the rear valve arm is worn and doesn't make good contact with the valve arm. Sometimes the valve arm would engage the surface in an upward direction. I fashioned a piece of light gauge aluminum flashing to fit around the contact surface and attached it with a few screws and some epoxy. I then reassembled the valve assembly and verified that it worked perfectly with the restored surface. Next, I reinstalled the "extra" spring that I surmised was missing and tried the operation. While it seemed to help, I kept adjusting the spring tension but could never get the door to completely seal off when the unit was upright. Eventually, I removed the string and turned the unit on ...and BINGO...the door closed and sealed. The unit somehow uses the vacuum pressure to close the door, not a spring. With the arm having a good surface to engage, the unit is now working like new. I'm done with poorly designed Hoover products. And, I've been told that they've recently been bought by a Chinese (I believe) company and things will only get worse. Hope this helps!

  • johnd1041 Apr 12, 2009

    I have the same problem, the spring just doesn't seem to be designed to fit properly, although it is the spring that was installed when I replaced broken parts of the valve. reddevil6 had the closest solution. I installed the spring with the bent arm under the valve arm that snaps onto the post. The straight arm of the spring I put under the tab that sticks out - the one that makes contact with the body to activate the valve. The trick that fooled me is there is no spring tension to open the valve when the vacuum is lowered, just vacuum opens the valve. The whole thing is a piece of junk and I'm tired of fixing this vacuum after 3 years. Next stop Dyson



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Could not find a picture of this installed, I have replaced this spring and it is hard to do. You have to put the straight prong of the spring unto the valve arm, you will see a spot for it to be at, then wind the other end of the spring around until it goes into a slot, then get it all together on the agi housing before it comes apart. Hope this makes sense.

Valve actuator, arm & spring assembly - 87aacd4.jpg

Posted on Feb 16, 2008

  • Lauren Junge
    Lauren Junge Feb 16, 2008

    I don't recall another spring, The rear valve arm is suppoed to hit a piece on the main body and that is how it actuates. Maybe you have another broken piece. Guess the next time I work on one of these, I better take some pictures of it.

  • Lauren Junge
    Lauren Junge Mar 01, 2008

    Well that piece I mentioned wasn't broke, just worn down, glad you got it working.


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The two pieces(Cam and arm) are installed with the spring between them creating tension on the assembly. The tension is significant, you probably will have a difficult time trying to do it without a vice. Here is what I did. Place part 41(the cam that rubs on the vacuum housing) loosely in a vise or other stationary device that can prevent it from turning when you put tension on the spring. The solid cam on part 41 should be in the jaws, but the entire slot must be exposed so as to properly seat the spring. Place Spring, part number 40 with the bent end in the slot on part 41 such that the bent part catches under the protrusion at the end of the slot. Loosely install part 39 on part 41 (it slides inside) then catch the straight end of the spring on the lever. Carefully making sure that part 39 remains enough above part 41 that it will not catch on the corners of the raised part but close enough that the spring cannot compress around the shaft on part 39 and must compress around part 41 (this was the trickiest part) use the lever to tension the spring clockwise until the lever arm is directly opposite the cam. Push parts 39 and 41 together until they engage completely and you can release the tension. The raised square portion of part 41 will engage the lever on part 39 and prevent the spring from being released. Remove the assembly from the vise and press 39 and 41 together tightly along the center mounting hole to remove any gaps. Carefully install both pieces as an assembly on the pin that holds them to the vacuum. The pin will tend to catch part 41 as you install it pushing it free from part 39. To prevent this you should press the parts on from the center mounting hole straight on to the pin with your thumb.

Posted on Aug 11, 2012

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You can do this! There are two pieces and a spring. A long piece that snaps to the post and a short piece that rubs the housing to the rear of the assembly.
Remove the Trunnion Cover on the same side that the assembly is on, this will allow you to lift the post to clear the transmission.
Assemble the two parts the bent end of the spring is on the small piece and the straight end goes in the notch of the larger piece. When assembled the two pieces are pointing 180deg from each other and have a hard stop.
Lift the post and snap the assembly on. Put it back together.
The purpose of the spring is allow the cam surface of the smaller piece rub on the housing near the handle as the assembly pushes the door shut and to absorb any excess tension there by removing the need for any adjustment. The assembly pushes the door shut when you lift the handle and suction opens the door when the handle is lowered.
The reason mine quit was the stops in the small piece broke so the spring didn't have a tension stop.

Posted on Feb 12, 2011

  • dresslerd Mar 06, 2011

    O.k., folks up above reconfirmed my belief that I was on the right track. However, after cutting two fingers on the spring under tension, I finally made a jig. I used two 20d nails nailed to a 2x4 to hold down the valve arm (front) and then assembled the spring and valve arm (rear) in place. As the final assembly, twist the valve arm (rear) while tightening up the spring until the assembly clicks into place. Remove the nails and the assembly holds together.

  • toclintmail Sep 09, 2011

    Your jig idea sounds great but I ws wondering what tools you used to tighten the spring?


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