Question about Northstar Professional Series Pressure Washer 4000 PSI

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I have a trailer northstar unit model# 66DX that looses pressure after you press the trigger. The pressue is great at first but dwindles from there. I have resealed the pump and replaced the spring valve what else could it be, I saw the solution about the different nozzles which i will try coulld it be that simple?

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Most likely problem is that the unloader is bypassing water. As unloader wears it will by pass at lower pressure. Try lowering the pressure at the regulator to lowest setting then raise pressure a little at a time untill unloader releases then lower to prevent unloading. Using a slighly larger tip will do the same thing. Using a larger tip size lowers pressure.

Posted on Sep 13, 2010

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I think you mean an UN Loader this is a valve that redirects (bypasses) the pressureized water back into the intake when you release the trigger When it is not working the machine continues to build pressure and will bog down

hope this helps

the ed

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1 Answer

Sprayer looses pressure pump issue ?


You can take the intake part of the pump apart and clean/lube the diaphragm of the pump. If you didn't clean it out last time it was used there will be residual or cake built up. Make sure the down snorkel is clear and doesn't have any contamination in the tube. Check the screen/filter also.

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Why is my unloader valve opening and closing when I'm not squeezing the trigger\


thats exaclty what a unloader valve does it unloads the pump when the trigger on wand is not depressed , it should however reseat and close off when trigger is pressed giving full presure to wand tip

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I have a northstar pressure washer 2000pw serial #03005610 item #157754b someone has took carb off and u was wonderin if u could give me a blowup of how the linkages and springs go ?


You will find your information by looking for model number and code of engine. Look on the fan cover, valve cover engine block or tag directly on the engine itself. Example would be Honda model gx340 from starter of engine. Then check google or mfg. web site for manual showing governor linkage. Norhstar uses several brands of engines. Good luck

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Hi:
You need to find the bypass (unloader) valve and grease it with a good waterproof grease. Sorry, I cannot find a pic for you

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THERE SHOULD BE A PRESSURE REGULATOR ON THE PUMP YOU CAN ADJUST FOR MORE PRESSURE THIS COULD BE THE PROBLEM. ONCE YOU PRIME THE UNIT THE REGULATOR SETS ITSELF AND WHEN YOU PULL THE TRIGGER AGAIN THE SEAT AND SPRING MAY BE STAYING OPEN AND NOT LETTING THE UNIT BUILD PRESSURE

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