Question about Karcher 5/16 INTERNAL L/W .332 ID X .620 OD ZINC

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On a borrowed as always Karcher 620m When I release the lance trigger the water supply to the lance does not stop.

I was advised not to use an extension lead but accidentally connected it through an extension lead when the problem occurred. I cant remove the incorrect product info from this template...sorry

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6ya6ya
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Posted on Jan 02, 2017

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InMrFixIt
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Hi! robcarroll
Did you purge the air from the pump before starting the motor.
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Posted on Aug 28, 2008

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SOURCE: Karcher 2400 psi blaster When you

To determine if your problem is due to an easily replaceable part, follow these steps:

1. Connect the water supply hose, the pressure hose, and the wand WITHOUT any nozzle tip.

2. Turn on the water supply, and press the trigger until water is smoothly running out of the nozzle
after any air is all purged out. Release the nozzle trigger.

3. Start the engine, and let it warm up for about 30 seconds.

4. With the engine running smoothly, press the nozzle trigger. The water should flow out of the nozzle (without the tip installed) at a faster rate, while the engine noticeably loads down as it used to do before your "no pressure" problem. If it does not load down, turn it OFF, and disconnect everything, and contact a Karcher repair facility.

5. If the engine does load down, release the trigger, and install one of the nozzle tips (not the black one).

6. Press the trigger, and the engine should load down, and you should have normal pressure from the wand. After you release the trigger and press it again, you will probably again have no pressure, and the engine will not load down. Removing the nozzle tip, pressing & releasing the trigger, and re-installing the tip should give you normal pressure again, but releasing the trigger will cause no pressure until you again remove the tip, press the trigger, and re-install the tip.

This is caused by a bad UNLOADER VALVE, which is located under a black cap with a metal button on it located on the top front of the pump. I don't know if you can purchase the replaceable parts from a Karcher repair shop, but when a neighbor & I took his washer to a repair place, it looked pretty simple to do this repair, and he was charged about $60 to replace a $5 (maybe) part, and it took about 5 minutes.

Posted on Sep 17, 2008

  • 62 Answers

SOURCE: karcher 620m runs but will not pump water

The pump that connects to the motor could be bad/and or loose

Posted on May 10, 2009

aroostookb
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SOURCE: Karcher detergent draw problem

return it to Walmart

Posted on Jun 23, 2009

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SOURCE: When I switch my karcher k4.97 washer on it just

Well, first the easy bit... the pulsation is caused by the leak, because the machine can't hold pressure when the trigger is released.  The difficult bit is: what to do about it?  Unfortunately, there are several different places where the leak can occur and, even with the cover off, it's usually impossible to be sure exactly where the water's coming from.  In the repair shop where I work, we almost always replace every part that might be causing trouble without even trying to identify the exact source.  To do otherwise will rack the labour costs up so high as to render the job uneconomic.  We reckon that if you can't complete the job in 45 minutes it's not worth it.  Sad really, but such are the realities of our economics.
Anyway, unless you are a really competent handy-person, this is probably a job you won't want to tackle for yourself.  So your choice is either to live with it (and do whatever you can to limit the pulsating time - keep it working or switch it off immediately) or take it to a repair shop.  If you are in the UK, Karcher head office can direct you to a repairer, and I guess the same applies in many other countries too.
If you do want to have a go at it yourself, post another message here and I'll give you as much guidance as I can (but there will be a limit to the amount of detail I can provide, as I can't get in to writing a complete service manual!).

Posted on Jun 24, 2009

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1 Answer

Karcher troubleshooting


check your lance nozzle is not blocked... Remove the lance from the trigger assy and see if you have water coming through then. If you do then the nozzle is blocked :@)

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Karcher 2500ph pressure washer spill valve has been replaced pull wand trigger pressure good for 3 or 4 seconds drops off for a second or 2 goes back to good pressure for 3 or 4 seconds drops off again for...


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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Karcher 395 motor does not stop running


if your machine was factory fitted with 'total stop system' TSS and has always stopped in the past then it is an issue with many possible parts !

does the machinw still operate at full pressure ?
if the machine can produce full pressure then it only has to produce 20 % more to actuate the TSS piston. When the stop piston moves it presses against an electrical switch tjat breaks the circuit. Producing 20% more pressure requires that your machine has no water leaks in the pump, hose, trigger gun or lance. Once you release the trigger the path back from the trigger to the pump TSS piston must be fully sealed.....

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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My washer makes a loud pulsing noise when not being used,as soon as I pull the trigger it works fine.


sounds like your unit has a bypass problem either needs adjustment or replaced

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what you describe indicates a problem hose or block nozzle jet
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When pressure washer engine is running and hooked to water supply, there is no water spray with trigger is depressed


Hi Have you checked that your nozzle in the lance end is not blocked. Please try this and then try without the high pressure hose attached.

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No pressure unless i take the nosle off , pull trigger and put nossel back on then it's ok until i release the trigger again ?


unloader valve sticking in the pump head. remove unloader valve/ pressure reducing valve as per parts manual.

It will probably be caked up in white crystal type deposits if its an aluminium pump head. clean off the deposits and inspect the 'o' rings. if 'o' rings ok , apply silicon grease and refit.

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