Hi folks....any suggestions....polite or otherwise please...
Karcher 411A...getting on a bit now.... loss of pressure...replaced 2 broken piston springs in pump...now have approx one third of pressure that it used to be.....anyone know where I can get a detailed diag of pump...may have rebuilt it incorrectly !...or any other suggestions always welcomed...Thanks for looking
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Don't know where you are, but in my location here in Canada, the local LORDCO parts store has a large selection of pressure washer accessories.
I'd suggest that you try to find a similar equipment supply retailer.
you have to lower the pressure at the lance for the detergent to be drawn into the hose. It works on a venturi principle. on the lance you will have to twist or pull back the end for it to go into low pressure mode.
the easiest way to check it is working is to take out the lance extension , the bit that fits into the trigger on a bayonet fitting. run the machine and see if it then draws in detergent.
If it doesnt draw detergent then look to see if there is a detergent valve fitted to the filter that goes into the bottle and check that it is fully open. sometimes ther is a non return valve fitted into the filter too. it could be that this non return valve has stuck. A poke with a bit of stiff wire should free it off its seat if it is that problem.
I have the same problem. With mine I have to remove the tip that I am using then pull the trigger and then replace the tip and pull and pressure should return. I believe that one of my valves is sticking causing me to reprime the pump frequently. I am trying to clean or replace my valves to fix the problem.