How do I adjust nozzle tip to get high or low pressure
The owners manual was badly written by someone in China whose English is a second language. The output pressure is set at the factory. The only thing the consumer can do is change the spray pattern by changing the nozzle. 0 for pinpoint, 25 for small fan spray pattern, 40 for large fan spray pattern, and Soap for dispersal.
SOURCE: how to get detergent to feed into Greenworks 1700 psi washer
In addition to the comment above regarding the need to use a low pressure (soap) tip, there's a chance the tanks or the hoses from the tanks to the valve and/or from the valve to the pump is plugged with dried detergent. The easiest way to clean out the hoses, unless you can see the plug with the detergent bottle removed, is to remove the top cover and pull all the hoses and flush them out. Removing the cover is not too bad. There are several recessed screws underneath, including a couple above the wheels that requires removing the wheels and axle.
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