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Karcher hds745 m-eco builds up to pressure. Runs fine for 300 seconds then loses pressure buids up runs for 20 seco ds loses prwssure again checked. Dilter strainer water pressure seems good any ideas anyone

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If nozzle is partially clogged, it can cause unloader valve to shift back and forth from high pressure to bypass. Air in the feed line can also cause this symptom. Some Karcher models have auto start/stop system which can behave this way if worn out, or out of adjustment.

Posted on Nov 26, 2014

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SOURCE: Karcher K3.91 compressor run for a few seconds every 10-15 second

They have a problem. I removed both valves and lubed with lithium grease as I was told. Unit is now working for how long who knowes.

Posted on May 19, 2009

  • 1388 Answers

SOURCE: pressure washer does not spray consistent flow of pressure

Pressure washers have a pressure regulator/unloader that bypasses the water back into the intake when you let go of the trigger with motor running. If you let the machine run for long preiods in bypass the system could be damaged due to heating of the water being bypassed. The water is in a closed loop. The as the unloader wears it will tend to want to bypass which is what is happening in your case. Dirt trapped at the tip will cause this also. Install clean tip to solve problem. If clean tip did not help then try lowering the pressure by turning pressure regulator counterclock wise. If problem is gone then parts are failing but keep using pump. Good luck.

Posted on Jul 11, 2010

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If you have a Karcher then you should always post your machines barcode.

full article on nozzles :
http://repairshed.blogspot.com/2013/09/pressure-washer-lance-nozzles-what-you.html

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