Rubber valve at bottom of blader tank

The problem that I see with these is the suction is applied across the area of the whole tank that also includes the clean water tank. With that suction in effect, the weight of the water is not enough to open the valve on the inlet where the tank couples to the hoses inside. When you remove the tank there is a 3/4 inch valve receptacle that you can see and it has a small set of passages in it. Under that is a small rubber disk that acts as a one way valve. Take a small screwdriver or punch and reach through the cross shaped screen and dislodge the rubber valve.

If you look at the bottom of the tank, all you should see is the small valve that lets the water out. The tank sit on top of a rubber seal when it is in place on the machine.

The most common reason for leakage is that the reservoir assembly has gone bad. If you look in the area behind the tank, you will see a rod that pushes down on a small round rubber seal when you squeeze the trigger. The assembly being pushed on is the reservoir, and the internal valve may be bad. This would require replacement of the assembly. ( Part # 43526016, msrp $6.49 ). Another possibility is that the seal that the tank sits on is worn or missing. There is a round black rubber seal that the tank sits on. There is a plastic pin in the middle which opens the tank outlet valve. I sometimes see this seal missing - usually because a child has pulled it off. If it is missing it must be replaced. ( Part # 38784060, msrp $1.29)

This is a common problem with this unit. For unknown reasons the tank stops dispensing water. A new upper tank is usually required.

Let me start out with an apology. I did not ask my question very well - and you did not answer it as I needed.
If you wish, we MAY be able to communicate in your native language. We can do most indian languages, Turkish, Ukranian and some Russian - as well as Spanish. If any of those are easier for you - please feel free to use any of them.

The Machine storage tanks are 2 - one clean water, one dirty water.
I understand that, when OFF, no leaks happen.
I understand that when on a leak comes from "the side". Also, water comes from the bottom.

So, water comes out near the bottom brushes (even without trigger). Then, with trigger, MUCH water comes out near bottom brushes. Am I correct so far?

Water out the side concerns me. I am guessing that the bottom of the clean storage tank may have a small leak.
I am also guessing that the trigger valve (located in the small opening behind the black rubber seal that the clean water tank rests on) is not closing all of the way - or is broken (cracked).

Can you please remove the clean water tank and inspect the trigger valve with a torch (flash light). Can you see it open/close as you operate the trigger? Is it broken, cracked, or dirty?
If yes then it must be replaced. If no, the the storage tank is bad and must be repaired.

You inspect all of these things and you should be able to determine the failure. THEN, I an help you repair the failed item.
-Jim (Raleigh, NC - USA)

the most likely cause is your resevoir assembly that the solution tank sits on. fill the tank with water and insert into place. then remove tank. you will see a puddle of solution in the black valve, pull the trigger and this small amount should be dispensed. if it does not then I would have it evaluated for repair or replacement.

I’m happy to assist further over the phone at https://www.6ya.com/expert/robert_b96ba3f038cf317c

(1) Does water or chemical leak from the tank when filled, but before it is installed? If not, then the tank is OK.
(2) If the tank is not properly aligned to the lower handle when assembled and latched, the black rubber seals on the handle will not seal to the tank. You may wish to look at this. Also, make sure both round black rubber seals are present on the flat mount where the tank valves will sit.

www.usavacuum.com/category-s/387.htm

You can find the parts you need here

Make sure the cap and the inner valve is seated tightly. There should be a black rubber gasket to help seal the cap and valve. A quick test is to fill the cleaning soultion tank with water (so not to waste the cleaning solution) turn it over and see if it leaks. If not then the problem would be where the tank sits in the unit. Make sure there is no debris in the unit where the tank sits.
good luck
D...

The part that the tank sits on, there is a round rubber seal(#40), is it in place? One of the rods in the handle asm. may be holding the Reservoir Assem.(39) down letting the water flow.
Is the valve at the bottom of the bottom ok and not stuck, oush in and let out, if it is moving up and down then it is ok.