SOURCE: I have a Pressure Washer
Derek, Hi and welcome to FixYa. I am Kelly.
I just now happened across your post and note it is 3 months old. Hopefully you already have the problem solved.
If not.. looking at the pump history of having the un-loader valve replaced it sure seems that the current un-loader valve is sticking. When an un-loader valve is removed the internal housing is sanded smooth and everything about the un-loader valve is coated with Lubriplate #105 White Grease. I get the feeling that who ever did the un-loader valve repair failed to sand / clean the housing and use White Grease for the final assembly.
You should remove the valve... Sand the housing and get some Lubriplate #105 white grease (auto parts store) in a tube. Lubricate it liberally and reassemble it. If should work fine after that.
Thanks for choosing FixYa,
Kelly
SOURCE: Low pressure when running.
basicly you can review all these videos and learn how to repair your pressure washer easily. Most have the same valves as shown were the hosses attach to
here is the link to many videos to view below
http://www.google.com/search?sourceid=navclient&ie=UTF-8&rlz=1T4GPCK_enUS397US398&q=pressure+washer+repairing+you+tube
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