Karcher

When operational the pressure keeps pulsing up and down the power band.
Experienced gardeners share their insights in answering this question :
You might have some dirt in the valve ( if the hose is shaking then check them.)

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Surging occurs when the pressure is fine and then weakens. It is caused when the flow rate for the pump cannot be supported by the water supply. Problems can mount from there so it is important that it is dealt with as soon as possible.
If the machine is pulsing whilst in use, it may be that the accessory you are using has a blockage. Clear by soaking the accessory in warm soapy water and then rinsing out under the tap.
A dirty inlet or discharge valve is the most common cause of a pulsating pressure washer. Dirt or hard water can get caught up in these little divots. It is important that you clean out these pieces every so often to prevent these kinds of problems.
Pressure may decrease if your packing is worn out or if there are abrasives or severe cavitation (bubbles) in the pumped fluids. This can be caused by an inadequate amount of water and/or a lack of proper filtration. To fix, install the proper filter.
Surging Pressure Washer Troubleshooting Tips

Check that the water supply and inlet screen are unrestricted. Check to see if the water supply does meet the necessary flow rate. If not, discontinue using the pump, because it will suck air, causing cavitation that can damage the pump`s parts.

Usually, well water pulsates when there isn`t enough air pressure in the tank. The two parts that regulate this pressure are the electric pressure switch and the internal air bladder inside the water tank. If either of them is malfunctioning, this can cause the water from your taps to pulsate rather than flow steadily.
The pressure washer vibrates excessively and is too much noisy > the water inlet filter may be responsible for it: if dirty, simply clean it.
The number one cause of low or no pressure when using a pressure washer is a blocked or worn nozzle. Blocked nozzles will prevent water from escaping, while a worn nozzle will allow too much water to pass through, causing the pressure to drop.
How Do I Tell If My Unloader Valve is Bad? In most occurrences, the first symptom of an unloader valve going bad is no pressure from the wand when the trigger is pressed. This happens when the unloader valve gets stuck open and does not allow water to enter the hose and trigger.
How Do I Tell If My Unloader Valve is Bad? In most occurrences, the first symptom of an unloader valve going bad is no pressure from the wand when the trigger is pressed. This happens when the unloader valve gets stuck open and does not allow water to enter the hose and trigger.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

1750 psi Electric Pressure Washer: My pressure washer is losing pressure and is pulsa…
ANSWER : If the pressure washer is pulsating then that is a sign of check valve failure. You may be able to clean of replace the check valves. Replacing the head is the wrong way to go. This is completely unnecessary. If you can tell me the model number of your pressure washer then I can assist you better in pointing you in the right direction.

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<!– from fixya rte –>Rope pull start is stuck, won't pull out – Honda Black Max 2600 PSI Pressure Washer
ANSWER : Check the oil level, if it’s very low or burnt then it may have siezed up internally.
It could also be that be that the cylinder is filled with oil or fuel.
if the washer was tipped over the fuel or oil may have migrated in to the piston combustion area.

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How do you bypass the cut off switch – Dewalt 3800 PSI Pressure Washer
ANSWER : Connect the white and black wire together

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Need help in getting Honda engine on NorthStar pressure washer to run.
ANSWER : Could be low water pressure I have found.Also, I purchased a can of “stuff” at Lowes today which allows you to circulate a liquid substance which lubricates the pressure pump….the pump could be frozen up…I have a rotating nozzle which I bought…and it had frozen up…this stuff works

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The motor will only run when i pour gas into the carb
ANSWER : Clean the carburetor

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I have a pressure washer that sputer when i pull the trigger. The moter sounds fine but i have pressure then nothing and i have pressure. Thank you Stu
ANSWER : How do i unclog the end of my pressure sprayer it works on low pressure but when i put it on high pressure nothing comes no water comes out.

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Soap feed The soap feed hose on my Karcher 2650 does not suck up the soap into the washer. I pulled off the connector piece that the hose is connected to. I can blow through the hose. There is a little metal finger thing that you can tell pushes up into place when the water pressure is high. It seems like it is supposed to drop down and allow some soap through when the water is running. I found a loose(attached to nothing) gasket, looks like a little donut. It was just free floating in there. I’m thinking it may go over the finger mechanism. I just put it back on top of the finger, like a halo and put the screw in piece back in. Anyway, if you know, let me know how all that goes together.
ANSWER : I fixed mine works good too, watch my video step by step i put it on youtubehttp://www.youtube.com/watch?v=UFXSLOBL0Mg

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Oil appears to have come out of the oil filler cap. Is this a sign of overfilling the oil, or something else?
ANSWER : Id definitley say its over filled. try checking the dipstick

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