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May 30, 2019 - 11:29:51 AM
3642 posts since 4/7/2004

Friend gave me his spare pressure washer for free, a North Star 4000 psi with a Honda engine and a Kat pump. I replaced the kat pump with the same that came on it and used it for two hours. Last time I released the trigger the relief valve popped. Not the one that opens if it overheats, the other one. Waited a day still did it. Called Kat and they had me bring it to a warranty center.

The repair place called and said to pick it up, it was incorrectly set to over 5000 pounds at the factory. Strange that it did not pop for the first two hours.

He said that he adjusted it so that it registers 4000 when starting up and it runs at 2500 when in use. Question is should a 4000 psi pump run at 4,000 when in use? I would think it should run at 4000 when in use and should be able to handle the temp surge, but I don’t know anything. Lol

The pressure valve that came with the machine states 6000 even though the unit is 4000. Sort of confirms that it should be able to handle the surge and run a 4K

Anyone know for sure?



Edited by - banjoken on 05/30/2019 12:07:23

May 30, 2019 - 2:26:08 PM



3492 posts since 10/7/2007

What little I know is that pressure is pressure, whether from sand or water or air. Enough force and a hurricane can hurdle a straw through a steel beam. Too much pressure and you'll destroy the thing you are trying to clean.

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