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Pull trigger an it pulsates instead of running constant

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6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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  • 389 Answers

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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  • 32 Answers

SOURCE: Pressure pulsating when pulling trigger

you have a restriction in the nozzle end of the lance. clean with paper clip.
if not you have some dirt in the pump head valves which need cleaning

Posted on Jul 04, 2009

KrisJohn1
  • 7 Answers

SOURCE: feeder motor on hh135 works fine with constant

Check the wire feed does not become obstructed when the trigger is pulsed. The wire can become tangled on the roll if it is able to get loose. The reel tension must be adjusted as the weight of the roll decreases.

Posted on Nov 24, 2009

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1 Answer

My K5.55 has pressure loss and judders while running. Vibrations are transmitted to the discharge hose. I need to adjust the wand constantly to get enough pressure.


Change oil, spark plug and clean/replace air filter. Do u have a choke adjustment, most have automatic govenors nowadays. Clean water hose intake screen.

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I have fuel but there is no power to the injectors to make them pulsate


It's a fused circuit, so check the fuse, probably under hood, labeled injector. A shorted injector can shut down the injector drive circuit, so pull off all injector connectors, make sure fuse is good, then check for power to the injectors. Injector circuit should nave hot wire anytime key is on. Has constant voltage to injectors. When the computer internally grounds the injector ground wire, the injector will pulse.

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Why does my karcher pressure washer pulsate when on but idol?


Hi Richard,

If by pulsate you mean the engine R.P.M.'s rising and falling, this is natural. It's the result of the engine reacting to the sudden back pressure in the pump by idling down.

The engine continues to maintain a constant pressure on the water cycling inside the pump while idle. It cycles within the pump because water can't be compressed. If there was no place for it to go, the weakest seal would blow or the engine would die.

When you pull the trigger again the pressure is no longer bogging the engine and the R.P.M.s smooth out.

Also, it's not good for it to be running for any extended length of time without water or the trigger being pulled.

Hope this answers it

Best regards,
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May 02, 2010 | Karcher Garden

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POWER CRAFT BY Karcher bought Aldi on 31Mar 05.2100Watts 130 bar.


You did winterize the machine? Leaving water in a powerwasher will freeze and damage the pump. It's a common happening, because people don't think of it or are not told by the maker.

Apr 29, 2010 | Karcher K2.26 Electric Power Washer

2 Answers

Pulsating when idle


The motor doesn't pulsate when you are spraying and pulsattes when not spraying is normal otherwise the pressure will just keep building and burn out the pump. However, if you are not using the sprayer right away then the unit should be shut off until your ready to start again.
I hope the answer is helpful, please rate if the answer has helped in any way. Good Luck and have a great weekend.

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I have a Kew Hobby 80. The output from the lance is not constant but pulsates.


Could be the input water pressure is not sufficient. There is a pressure valve inside the machine that will cut off the motor if input pressure is too low or non existent.

Try a different source for the water input.

Feb 22, 2010 | Karcher PSI Electric Pressure Washer

1 Answer

Pressure pulsating when pulling trigger


you have a restriction in the nozzle end of the lance. clean with paper clip.
if not you have some dirt in the pump head valves which need cleaning

Mar 22, 2009 | Garden

1 Answer

Have a Alto Active x tra High pressure washer and it keeps contantly pulsating have followed instructions for trouble shooting but does not cure it. any Ideas.


have you bled the air out of the supply hose could be an airlock.
leave power off and pull trigger until no more air comes out of nozzle then turn power back on

Jul 14, 2008 | Washing Machines

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