How do I fix a Honda XR2600 Pressure washer

Frank, either the unloader valve is out of adjustment(try loosening it off) or it is faulty and needs rebuilt or replaced as most people do.
Check the attached vids,instruction and guides, Good luck
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check for a blocked main jet in the carby
the principle is that when the trigger is released there is no pressure in the pump so the engine is idling
when the trigger is pulled the pressure control valve closes the bypass back to the pump and so the motor is loaded up if there is a problem in the carby ,then the motor will stall

Yes, full off grease and grease has blocked pressure relief.
needs a big strip down and clean all the grease out. Big job!

Your engine produces max horsepower at 3600 rpm. The engine throttle should be set to max before you pull trigger. Pressure washes generally do not have automatic throttle. You do not have to use max power, but enough power to keep the engine running when trigger is pulled. You washer will actually last longer if you only use about 75% of rated capacity. Good luck

oil capacity is 20 oz. 10w-30

If you only have line pressure you probably have a stuck open bypass or unloader valve.

the unloader is usually on the pump body and can be taken apart and cleaned and lightly greased with a little silicone grease to keep it limber.

I hope this helps!

http://www.excellpressurewasher.com/product_manuals.asp

I have the same problem and it seems the piston in the back has a ring and the ring is broken i half i'm talking it to get fixed tomorrow i will keep you informed.

Your pressure relief valve may not be working. If that happens when you shut off your spray gun, then pump is dead heading, stopping the motor. If this is the case it stops dead, not coasting. Either replace the pressure adjusting relief valve or remove it, and disassemble it and clean it.

My Kracher 2500 pressure washer has no pressure unless I remove the nozzle. If, I remove the nozzle and pump the trigger several times and quickly replace the nozzle it works fine until I release the trigger. Karcher (online) suggested I remove and clean the unloader which I did. It still doesn't work correctly. What another solution?

I worked at a tool rental center while attending college and learned many tips and tricks about Dewalt and other brand pressure sprayers. Your machine probably has a 13 hp honda and has max pressure of about 3500 to 3700 psi. Most of the problems that customers had were engine related due to severe working conditions including totally wet engine /plug, wet air filter, and or other problems that were easy to remedy. We would set the pressure regulator to minimum pressure and explained to the customer how to increase the pressure as necessary but only after the engine was completely warmed-up to running temp to prevent engine stall. Your machine has a throttle lever between the tank and carb that should be set to max if you are going to set pressure at or neer max range. Most cleaning jobs do not need much pressure. Use lowest pressure to get the job done. Your engine developes around 13hp at about 3600rpm. If you want to maximize the life of you sprayer, then use your machine at about 70% of capacity or about 2000 to 2500 range that will allow you to run your engine slower increasing lifespan. Your sprayer is likely rated at 4 gallons per minute so make sure that the tip is that capacity. The tip has the size stamped which would show the fan degree and flow in gpm. The wrong tip, say a 3.5 gpm will strain the engine to point of stop because the smaller tip increases pressure. Most engine stall is due to high pressure setting on new machines. Lower pressure when warming-up machine and use max pressure rarely when necessary to max life. Please email for other information/questions or simple tests to determine faulty parts, good luck.