Question about Karcher 1550PSI Pressure Washer
If the unit has been stored you need to remove the bottom three plugs on inlet side of pump head and simply free the checkvalves that are in closed position needle nose recommended and small screwdriver to pry them open this is caused by the impurites in water that dry up and seals the head and disc together:):)
Posted on Aug 05, 2013
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Posted on Jan 02, 2017
there is a loader and unloader valve on your pump bolted to it. if it frozen in the open position it will never build press. most of the time this is caused by leaving cleaning solutions in system after use and let set up for a long period. it causes the aluminum case to corrode.;you will have to dissassemble and clean if not to bad. if not your going to have to replace.
Posted on Apr 21, 2009
disconnect the hoses to and from the machine and the try it.
the machine might have a blocked nozzle in the lance, of so get a paper clip and clear the jet backwards
Posted on Jul 04, 2009
I have a similar problem and diagnosed it to be a problem with the gun. I spoke to a technician that services this pressure washer and he walked me through all the diagnostic steps. The pump is working because there is pressure being built up and the gun sort of works because you can get water out before the washer is started. The technician said that the mechanism inside the gun is either clogged or broken. I am going to Home Depot or Lowes to purchase a new gun and will try it tonight. Guns are only about $30-40. He said generic is fine as long as the thread matches and PSI is in range. Good luck!
Posted on Aug 14, 2009
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