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Karcher B403, When pressure system is turned on the pump pulses about 2 times a second until the lance is turned on; pump then runs continuously until lance switched off; then starts to pulse again. Cleaning power is less than it should be, no obvious leaks from pump assembly even when washer is partly dismantled to inspect internal connections.

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Hi,

Sounds like.. You have a bad pressure switch or the small hose connecting to the pressure switch may be bad or the connection on the switch or tub is linking air pressure

Thanks

Posted on May 31, 2009

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Posted on Jan 02, 2017

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1 Answer

Karcher k5.700 wont run continuously at high pressure


Your unloader or your packing could be cooked and these washers can be a pain to work on or to even find someone to work on them. Since it is a cheaper fix I would replace the adjustable nozzle on your wand first. Those are notorious for going bad. Then you have no pressure and you think your pump is bad. Most electric washers arent worth working on as the cost of parts and labor often exceed the cost of buying a new one. look on your manual for the unloader and packing or jsut go here. FIND PARTS FAST Good luck!

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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

The spill valve operates at approx 20% higher than specified pressure washer operating pressure. If you have any lance issues then the pressure could be running higher than specified (machine running at same pressure as spill valve operation pressure)

your machine produces a fixed flowrate of water (maybe 8 litres per minute) and your nozzle is a fixed size. the diameter of the nozzle determines the back pressure. A piece of debris could further close your nozzle orifice and increase the back pressure. Using a new lance that has the wrong nozzle fitted can also cause this issue.

The karcher barcode is on a silver sticker and is usually 15 digits long. Example 156987400000123 is actually model 1.569-874.0 and serial number 00123....

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try the machine with the lance removed from the gun.

buzzing is usually the noise made by the motor when it cant turn. if the pump start to pruduce pressure but the pressure builds up too high then the motor will stop turning... faulty lance or faulty spill valve (dump valve)

If you have a Karcher then you should always post your machines barcode.
The karcher barcode is on a silver sticker and is usually 15 digits long. Example 156987400000123 is actually model 1.569-874.0 and serial number 00123....

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I have a Karcher K3.540 pressure washer. Won't take up detergent and motor pulses ever second if vari-lance increased towards maximim. Motor runs ok at lower pressure but can take 1min to start wh


This fault is within the control head, under the detergent valve is a small spring loaded valve that acts to induce the detergent, this will have failed, the shaft of the component breaks off the disk base leaving a small hole in the centre of the disk. This is enough to allow pressure past the component. The machine will pulse when operated and will not induce the detergent. I've looked everywhere to find this part as I have a karcher with the same fault.

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1 Answer

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1 Answer

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hi , the most common cause's of this fault is a deffective unloader valve or a small peice of dirt or grit caught in the pump valves , unless your quite mechanically competant i would suggest you take it back to your local Karcher service agent as to repair them your self is quite a involved process , if you want to try a repair yourself this link is quite good
http://www.paddockdrayage.com/Karcher/index.htm

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hi,
there is a small ball bearing inside the nozzle on the end of the lance , this can get jammed or missaligned and the nozzle orifice can get blocked , clean this or replace the whole lance with another 200 Bar lance .

hope this helps

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hi mark, you do have a problem with the lance.
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