There is a groove under the control knob in the main housing which the piston will slide into until it reaches the part that turns.Place on water only setting and slightly lean piston back so the small groove engages the wheel that turns then place housing assembly above main unit and lower until piston is lined up above piston hole.
Tighten screws and check for easy yet slight hold on mixture knob.
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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.
Make sure that the piston on the bottom of the smart mix valve is in the water only position.(needs be be on the knob and not sitting in the hole). With the top off, it is easier if you have a block of wood or something under the base to hold it up. Other wise it drops down and the screws can't grap the base. Also make sure all hoses aren't being pinched.
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)
Check the bottom of the tank and make sure that the seal is on the valve and not sitting in the hole where the tanks sits. At the back, is the top and bottom tight together, or is there a gap, should be no gap. Is the mix valve **** turning easily or is it hanging up? Sometimes the flow indicator cap leaks air and needs to be replaced. To get to the pump, you have to take off the top cover. Look and see if any lines are pinched, if not, then replace the pump, also check the pump belt.
Does water squirt out of the hose nozzle, if it does, then check the
heater inside the handle asm. Make sure that where the tubes hook up
to it are not clogged. If water doesn't squirt, check for the seal at
the bottom of the tank, it needs to be on the tank, not in the hole.
The flow indictor cap is leaking air or maybe is too tight. If you had
the top cover off, make sure that the tubes are routed right so as not
to get pinched when the cover is put back on, the smart mix knob should
be in the water setting and that the piston is on the bottom of the
smart mix know. Pump is bad.