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These units come with a detergent bottle that attaches to the spray wand. The manual describes what detergents to use and the attachment reduces the pressure and siphons the right amount of detergent from the container. It is not a good idea to try to run detergent through the pump.
Here is a link to the operating manual for a similar pressure washer. http://www.ppe-pressure-washer-parts.com/files/1961581/uploaded/pw0501400.pdf.
It goes onto the wand itself. With the Pressure Washer off: If you have the wand unattached from the hose it works easier. Then separate the WAND into two pieces at the big joint in the center. Insert the bottle into the joint on the opposite end of the section that will be attached to the hose, (once you have the wand in two pieces you will see the same types of connections that are on the bottle.) then attach the other end of the wand to the bottle. Now reattach the wand to the hose.
The siphoning mechanism on almost all power washers use "The Venturi" effect to suck up the detergent. Basically, there's no pump...the force of the water passing the siphon hose causes a vacuum which draws the detergent up the tube. There's a small ball that is supposed to fall and block the tube when the trigger is released so it sounds like it got jammed up in there somehow. You could it apart and free it up but I would recommend just purchasing an external detergent dispenser. Home Depot carries them for about 15 bucks. They allow you to use soap with high pressure and bypass the always problematic siphon system.
To the right of the Brass fitting where your garden hose attaches there is a small round plastic cover piece, pull on that and it will pull out a clear tube with it which goes into any container containing your detergent, it will pull the detergent as you use the pressure washer. Push the tube back in after you are done using it. You can also buy a replacement detergent bottle for other pressure washers if you wanted to.
take off clear tube that goes into solution jug(where soap goes),make sure it is clear(water passes thru it easily) use a soda bottle- fill with vinegar- reattach hose and put other end in soda bottle- if this doesn't work that valve in the sprayer itself is gummed up- sometimes using HOT water feed sprayer will clear an internal plug
remove the blower tube by turning anticlockwise. remove cover from air inlet same way. attach large diameter suction tube to air inlet (has to fit correctly as this is where the safety switch is) attach collection bag to air exhaust opening (where you removed the blower tube from)
I have never worked on your type of machine. But generally this is what you do. Disconect the pipe from the inlet to the machine. Attach another pipe and put the other end in a bottle of water. Start machine and on low pressure see if the machine sucks water from the bottle. If this does not happen, try to service the inlet part at the machine. This usually it will have a ball-bearing as a non-return valve. This non-return valve sometimes gets stuck. If you see that you have solved the fault in the non-return valve, attach the detergent tank as it was, but instead of detergent, use water. You should always use low pressure. If all is OK, try some detergent. Always remember that after using detergent, always pass clear water from the detergent tank. If you leave detergent in the system, this will cause problems.
if you follow the chemical hose back to the pump it will be attached to a barbed nipple, behind the nipple there should be an o-ring, spring and a ball. A lot of the time if you are using the proper nozzle in the low pressure setting and still cannot create suction the ball will be stuck to the o-ring. You can just free this up and put a little white grease on the o-ring.