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

I disassembled to clean out some hoses. The smart mix valve fell out and I don't know what position it was in in relation to the smart mix dial on the outside of machine. Can you help or do you know where I could obtain a schematic that shows the way to do it. Thanks Boyd

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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.

Posted on Feb 22, 2008

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I don't know what happened, but it seems my unit is not pushing down all the way to engage the cleaning solution. Also when I turn the knob for the POWERDRIVE, the entire handle pulls out and the unit shuts off

Posted on May 26, 2008

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Great advise. I repair these all the time! This solution is BETTER than the way I was doing it. Thank You!

Posted on Nov 30, 2008

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Take of the housing ,turn it over and you will see the under side of the auto mix dial , Then turn the auto mix dial to rinse only;
On the top of the piston you will see a small slot , this fits into
the out side spiral on the auto mix knob with the dial set to rinse only the top part of the spiail sould point to the courner
Tilt the piston slightly,then hook it on the point of the auto mix knob , when you turn the auto mix dial to heavy traffic the piston should slide down the outer spiral of the auto mix-dial ,
Put the housing back on with the auto mix dial set to heavy traffic, but make sure no tubes are trapped or this will stop the flow of water,
i hope you can under stand what i have wrote ,Goodluck

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