Having problems with your Karcher 2500 PSI Pressure Washer ?

High pressure issue

\015 I have a K2400 HH gas unit. This problem started last year & is still on going. They only way I can get high pressure is to remove the tip from the quick disconnect, pull the trigger and the pump & engine will now cycle up and pump a 3/8" dia stream. Re-install the tip, pull the trigger and I will have high pressue until I let the trigger go. A re-pull of the trigger will only give me a light fan stream. I must repeat the above step over & over again in order to use this machine. It does not matter what tip is used. Same problem. I have tried: Bought a new gun. Cleaned all tips & system in vineagar hoping for calcification. Cleaned inlet filter. Have a 3/4" garden hose with 50-60PSI coming in. Dismantled pump,cleaned & flushed all ports, cleaned and inspected main bearing, (3) sets of rods, seals and faces, retainers, springs & seats and added new oil. All appear OK with minor wear on the (3) small conical plastic piston rod faces. \015\012The spill valve was slightly covered with iron deposit. The bore was a little rough as well. All in all, it looks pretty good. I cleaned it and cleaned the bore, flushed it out, coated with lithium grease and still have the same problem. I noticed the flats on the top stem where you pull it up & out. Are these so the spill valve can have the spring tension adjusted? The bottom of the valve is threaded onto the top. Maybe the years of use has caused the tension to be relieved and needs to be re-adjusted tighter. \015\012Engine runs great but this machine is now to much of a hassel to use. Once I get through the "purging procedure" it cleans great until I let the trigger go. \015

Answers :

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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