Question about Karcher 2500 PSI Pressure Washer

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Karcher HD3101DR wHERE IS THE UNLOADER VALVE ON THIS UNIT CAN I GET A PICTURE/DIAGRAM???

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Posted on Jul 08, 2008

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Posted on Jan 02, 2017

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Want to know what the black Knob, I think called unloader valve is used


Hubert, The unloader valve is like a by pass for the water and regulates/controls water pressure and redirects water when gun trigger is released. Check the attached links,instruction and guides to learn more about Pumps/unloader, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
Pressure Washer Unloader Valve
How to replace an unloader valve on your pressure washer pump
All About Unloader Valves ePowerWash
How to Replace an Unloader Valve on Pressure Washer Repair Guide Help...

May 17, 2016 | Garden

1 Answer

Fire department says it is leaking at pressure switch, does this unit have a unloader valve and a check valve?


It would have to have a check valve and a unloader valve or it could not start again with any air pressure in the tank. The unloader is in the limit switch, should see a small plastic air line going into the limit switch, when the limit switch shuts off the electric motor it drains the pressure in the cylinder so there is no load on the compressor so it can start, so if there is air coming out of the unloader when the electric motor is shut off it is the check valve if it is coming out all the time even with the motor running it is the unloader in the limit switch.

Apr 21, 2016 | Air Tools & Compressors

1 Answer

How to adjust the unloader valve.


With a pressure gauge. If it's a home duty model it can usually be turned all the way in without damaging anything. Try turning it all the way in and fire it up. If the engine/motor doesn't groan or stop, you're probably okay. If the unit stops or slows down when gun is closed, immediately open gun, then shut down. With unit off, back off on unloader setting and set with pressure gauge, or have it done by a professional.

Aug 23, 2014 | Craftsman 3000 PSI 27 GPM Briggs ...

1 Answer

Do the spring end caps inside the 315747GS unloader valve face the spring or the ends of the valve


This parts diagram for the pump should answer your question http://lawnandgarden.manualsonline.com/manuals/mfg/craftsman/580751651.html?p=22

Jun 08, 2014 | Craftsman 2500 PSI Briggs & Stratton...

1 Answer

Unloader ir t30 not operating tripping motor trying to start


the unloader is made into the pressure switch. When unit shuts down you should hear air blow out at the bottom of the pressure switch for a short period and stop.If it continually blows until the unit tries to start the tank check valve needs to be replaced. the check valve is located in the top of the tank where the discharge line goes into the tank. Also if you check the bottom of the pressure switch with the cover off you will be able to see the unloader. It's a schrader valve that is hit by a small arm on the pressure switch. you can replace the schrader valve. if it's something on the pressure switch the switch should be replaced. I've seen check valves bad but very seldom do you see the unloader bad. hope this helps you.

Jul 10, 2011 | Ingersoll Rand Type 30 Reciprocating Air...

1 Answer

I have a 4,000 psi, 4.5 gpm 45G cat pump powered by a 13 hp honda engine I can not seem to be able to adjust the unloader valve to give me pressure over 950 psi and even at lower pressures, the pump...


I would just purchase a new unloader valve, they usually aren't worth rebuilding. I would like to have a picture of the set up that you have, if you can send me a picture of the unloader region of the pump I can get you are price on a new one. email is justin@wmpcs.com

Oct 22, 2010 | Honda Pressure Washer PSI 3000

1 Answer

No power


The most common problem is the unloader valve.The valve that you use to adjust the pressure need to come out and then free up the unloader valve with some penatrating oil and maybe even some emery cloth.If you cant free it up then it will have to be replaced.

May 09, 2010 | Karcher K2.26 Electric Power Washer

1 Answer

Compressor fly wheel not hung up unit starts operation soon fly wheel starts to slow down like it is laboring then stops and motor overloads and trips protection switch


It sounds like the unloader valve it not working correctly. The unloader valve bleeds off the pressure between the pump head and the tank check valve. Without it every time the compressor starts the piston would be working against the max tank pressure. This would cause what your describing. However when the unloader valve is not working the pump will shut off with in a couple seconds. If your pump is working longer then that I would guess that the unloader valve may be bleeding off some but not all the pressure.

On most smaller craftsman compressors the unloader valve is comprised of a piece of tubing running from the cylinder head or the check valve to the switch. At the switch you will see a plastic tip with a pin running to a small trip lever. Make sure that it's moving freely and moving through it's full range of motion. It's impossible to describe how this looks and feels to someone who has never messed with one of these.
After you have checked it and made sure it's working, if you still has trouble after this please let me know.

Oct 15, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Engine will not start when the water is on. You can start the engine and then turn the water on but it will kill the engine. I have tried to clean the unloader valve.


To isolate whether or not the unloader valve is still stuck or sticking, try starting the unit with the wan trigger engaged water coming out to spray. If the unit runs while wan trigger is engaged and shut down when released your unloader valve isn't working. Hope this helps God Bless

Sep 18, 2009 | Garden

1 Answer

No pressure / Karcher G 2400 HH


Hi ruthkapres:
Here is a diagram. The unloader/spill valve is #12 on page D2 or F2 depending on your model. You must pull it out, inspect the o-rings for dents or tears and make sure the valve is lubricated with a good water proof lubricant.

Jul 14, 2009 | Karcher G3025OH Pressure Washer

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