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Small Engines (Lawn Mowers, etc.)/Karcher 395 electric power washer


pressure is fine when running, electric motor works good, but recently will not shut off when it is turned on , it use to turn off when the trigger on the hose was released , turn back on when you needed pressure, now it just runs, hit the trigger , sprays fine , let go of trigger keeps running

Any ideas

There must be a pressure switch on the pump that makes contact with an electric switch.  I suspect the pressure switch has an o-ring or a plastic piston.  The o-ring may need to be lubricated.

There is a You Tube video showing the pump dis-assembly.

Another good video:

Take a look at the videos and see if they help.


Small Engines (Lawn Mowers, etc.)

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Eric A. Jones


Lawnmower Repair . Certified Master Service Technician from B&S. Have 23 years experience on B&S, Lawn Chief, Weed Eater, Echo, Peerless, Wheel Horse, Snapper, Atlas, MTD, McCulloch, Homelite and many other numerous brands. Specialize in electrical repair.


Born and raised in the midwest. Started tinkering with engines when I was about 14 on my Suzuki RM-80. I began lawn mower repair at a small hardware store. I knew absolutely nothing. I read lots of repair manuals and met an older fellow who taught me many lessons. I continued working on small engines through high school and paid my way through college working on mowers at the same hardware store. Decided to get away from the midwest and mower repair so I joined the Air Force. I repaired air traffic control electronic equipment and ended up in Hawaii where I got a part time job at Small Engine Clinic. I gained a lot of experience from the Small Engine Clinic and had a blast repairing small engines. I then took the Briggs and Stratton Master Service Technician test and earned my MST. I then traveled to Wisconsin where I attended the factory update training seminar and received formal training. Continued working on mowers part time as I completed 20 years of military. Retired from the military on a Friday and continued in the lawn and garden industry the next Monday.

MAS Aerospace Operations BA Mathematics AAS Electronic Communications AAS Electronic Technology

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