Question about Bissell 7901-1 ProHeat Scotchgard Upright Wet/Dry Vacuum

1 Answer

Smart mix valve reassebly and alignment

The Smart mix valve, How do you align the"screw" adjustment knob to the valve mechanism when putting the housing together.

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  • bradley t Feb 16, 2008

    Thank you , The piston fell out when I replaced the pump...I knew that the screw threads and the cam part of the piston had mesh.... I just couldn't figure the piston position. Thanks again

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  • Master
  • 1,673 Answers

Have the piston on the screw threads, put the knob on the water only setting, then after the piston is on, turn slightly so it doesn't come off, just before you put the housing all of the way down, turn the knob back to the water only setting and then push the top all of the way down. Turn the knob back and froth and if it turns smoothly, then it should be ok. If you put the top down and it is straight, the piston will go into the slot ok.

Posted on Feb 16, 2008

  • Lauren Junge
    Lauren Junge Feb 16, 2008

    You are welcome.





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1 Answer

How do you get the smart mix dial to line back up when replacing the top plastic cover on a bissell pro heat pet.


First, insert the black plastic control valve all the way into the hole. Make sure that the rounded face with the cut in it is facing toward the tall part of the chamber/hole where you inserted the valve. Try to line up the dial with where the threads would enter the cut in the valve. Hint: the hole in the center of the dial will go over the tall part of the chamber wall. Once you believe you have it aligned correctly, replace the plastic body cover and keep the dial out of the body cover. Just put in the screw on the side the dial is on, so if it is not aligned properly, you can remove the cover more quickly. Once you have the body screwed down, screw the dial into the hole and it should align easily with the valve in the hole. If not, remove the body cover, and try to realign the valve again. Repeat until you get the dial to screw in easliy.

I just did this today because I had to fix a customer's unit. It took me about 20 minutes or so to figure it out, but I finally got it. I was hoping your question had an answer to it when I got on here, but at least I got it figured out anyway. Hope this helps! That is if you still have this unit...

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1 Answer

The solution in my smart mix will not mix with water and the button just keeps going round and clicks and will not stop on either water or solution.


The smart mix knob is connected to a piston that slides up and down into the automix assembly. This piston has come off of the smartmix knob and left the unit on water only setting. Sometimes the smart mix knob breaks on the bottom side letting loose the piston.

This can be a difficult repair. You have to unscrew the flow indicator window and remove the fan and screen(pay attention to how they come out, most people want to put the pointed end of the white screen down. It goes up.) Place a piece of 2X4, a book, something underneath the machine, between the rear wheels. This will lift the wheels into the air, and keep everything in place when you remove the hood. Take the 6 screws out that hold the hood and lens. As you remove the hood try to do it slowly and pay special attention to any hoses that might try to pull off with it. If you don't get those hoses back into the right place, the machine will not work. The piston will probably be stuck into the automix assembly when you get the hood off. It is a three inch black cylinder with an O ring on it. If you hold the hood upside down and place the cornered side of the piston into the corner of the housing between the knob and the solution chamber, you should be able to hook the winding on the knob with the piston and then turn the knob to screw the piston down into the windings. It won't lock into place, but hold it there well enough to put the machine back together correctly.

If you feel like you're forcing something when putting the hood back on, you probably are, so stop and check to make sure all the hoses are where they are supposed to be.

Good Luck

Nov 25, 2008 | Bissell 7901-1 ProHeat Scotchgard Upright...

1 Answer

I THINK THE SMART MIX PISTON IS INSTALLEDS WRONG


it has the rubber seal and the container releases fluid when it depressed.... bipolar lol..

fill it with hot water and prime the machine.. don't use soap just try lear the lines.. always run hot water through your machine to clear the lines before storage.. and to maintain prime

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1 Answer

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The knob itself will only go in one way, What I was talking about is when you put the top cover back on, the knob should be in the water only position. This way the piston (on the bottom of the knob) will go into the slot correctly.

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2 Answers

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I figured it out,since you nor Bissell was of no help. It turns out to be quite easy.

Jul 20, 2008 | Bissell 1699 ProHeat Clear View Upright...

1 Answer

Removing the top of the 7901-1 Bissell Proheat


Unscrew the cap for the flow indicator, remove the 6 screws, the top will come off. When you put the top back on, make sure the piston is hooked on the smart mix knob(underneath the top cover) set the smart mix valve in the wtaer only setting, then put the top back on. Turn the smart mix valve to make sure it is turning like it should, then re-install the 6 screws and the flow indicator parts. (don't over tighten the screws)

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3 Answers

Can't reassemble!!!


The piston is put on the bottom of the smart mix knob, turn the knob to the water only setting, then put the top housing back in place making sure that the piston went into the slot, after the top is all of the way down, turn the knob, if it turns easily, then it is in place.

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1 Answer

Bissell Pro-Heat Pro-Tech Carpet Cleaner


Put the piston on the bottom part of the knob, You want the the knob to be at the water only setting when it goes into the slot. After the top is pushed all of the way on, turn the auto-mix knob to see if it is turning easily. If it doesn't stop, and wants to keep turning, then you probably need a new knob.

Nov 23, 2007 | Vacuums

3 Answers

Bissell proheat pro tech model 7901-3 smart mix dial and valve assembly


Turn the knob to the water only, put the piston on the bottom of the knob then turn it slightly so it doesn't fall off, Start to put the cover on, when it is straight, turn the knob to the water only selection and push the top all the way down. The piston should have gone into the hole and the knob should turn easily.

Nov 14, 2007 | Vacuums

1 Answer

Rt. elevator arm replacement


Take off the top cover, then you can replace the elevators, they come both sides in a package, part #2000010. When you replace the top cover, check all tubes to make sure they are routed right so as to not pinch one when the cover is locked down. Also there is a piston that attaches to the bottom of the smart mix valve and that the smart mix knob is on the water setting, then put cover back in place and don't over tighten the screw.

Jun 13, 2007 | Bissell 7901-1 ProHeat Scotchgard Upright...

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