Question about Northstar Professional Series Pressure Washer 4000 PSI

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Why is my unloader valve opening and closing when I'm not squeezing the trigger\

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Thats exaclty what a unloader valve does it unloads the pump when the trigger on wand is not depressed , it should however reseat and close off when trigger is pressed giving full presure to wand tip

Posted on May 13, 2014

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My honda excel 2600 psi pressure washer do not have any pressure when i squeez the trigger


Trash in, worn or damaged inlet and outlet valves are one possibility. Unloader valve stuck open or badly worn would also cause low pressure. Wrong spray nozzle size is another. Is the nozzle the right size for your pump?
Is water leaking from under the pump? That would show worn high pressure seals.

Apr 13, 2014 | Garden

1 Answer

I have a Karcher G2500HT. When I pull the trigger the pump will not engage. I pulled the pump off, checked the seals, and cleaned the screen. When I put it back on there was no leakage but the pump...


I would have to agree with your service department. The unloader valve works like this, When you press the trigger it closes and allows the water to build pressure through the pump. When you let off the trigger the valve opens and by-passes the water through the pump so you don't damge the pump. If this valve is sticking and remaining open the pressure will not build. You can remove this valve and clean relubricate with white lithium grease just a coating and this should clear up your problem. Check the port that the valve sits in and if you see gunk just clean with carburetor cleaner and blow it out with air compressor. A new unloader valve can cost between $40.00 - $60.00. Try to clean first before you buy a new one. The valve is usually located near the outlet that you connect your pressure hose to. If you can't find it go to jackssmallenginerepair.com and do a parts look up for your machine and you will see where this valve is located. Hope this helps.

Jul 20, 2011 | Karcher 2500 PSI Pressure Washer

1 Answer

My pressure washer stops running when i let off the trigger


hi there sal rick85

sounds like the unloader valve is not working or stuck closed , check the setting of the unloader valve may be set too high, the unloader must open in odrder to cycle water back to inlet side of pump - if not builds up heaps of pressure , stalls the engine - service the un loader valves on the pressure head

take look and let me know - what brand your blaster unit is i know its honda but what pump
comet - axd, lw/zw, - in line or axial cam

in the mean time here is good web site on power washers

http://www.the-power-washer-advisor.com/

or go to
http://www.the-power-washer-advisor.com/pressure-washer-pump-trouble-shooting.html

cheers pauly46

May 30, 2011 | Honda Pressure Washer PSI 3000

1 Answer

Lost pressure let handle go spits out 1 second of pressure then no pressure


What you are describing is an unloader valve failure. The unloader valve (also called a spill valve or safety pressure relief valve) is sticking in what is known as bypass. Your pump is able to build pressure but when the trigger is squeezed, rather than directing the flow up to the nozzle it is looping the pressure back through the pump as it does when you release the trigger. Depending on the specific brand and model you will need to either replace the unloader or lubricate it if it is a Karcher with a spill valve. If it is a Karcher there is a known issue with the following models:

K2300G1
K2400HB
K2400HH
K2401HH
K5800G
K5800G

All of these have an issue where the spill valve sticks and will need to be lubricated with Vaseline or lithium grease. You can view a guide for this process at http://www.landanorthwest.com/dms. Select Maintenance/Karcher/Pressure Washers/All/Spill valve lubrication.

Sincerely,
Aron Kerr
Landa Northwest
www.landanw.com

Mar 08, 2011 | Ridgid Diehead Complete 11R 12 NPT

1 Answer

I have a 5SR EP50SE compressor with an INTELLISYS controller the problem is when the set offline pressure is reached there is no voltage coming out from the controller to trigger the blowdown and the...


The blow down is a normally open valve so there will be no voltage when unloaded. When voltage is applied the blow down valve closes and the load solenoid opens allowing air to the inlet valve which should open. I suspect you have a bad load solenoid. If it leaks by it will keep the inlet valve open to some degree depending on how bad its leaking. If this is an older EP50SE you may have a spring in the bottom of the inlet valve that has broken. then there is not enough pressure to close the inlet valve. These are two common problems with this unit. Also if you look inside the controller panel there should be a wiring diagram. It should show 1SV and 3SV wired together. 1SV is the load solenoid and 3SV is the blow down valve. There is no unload solenoid. There is also a solenoid for line / sump pressure and a modulation solenoid.

Mar 07, 2011 | Ingersoll Rand Stationary Air Cooled...

1 Answer

The engine will start but I'm not getting enough pressure when I press the the sprayer gun. Water is coming out but no pressure. Not sure what to do.


This can be caused by three different components. Either your unloader valve has failed, your valves have stuck open in the head of the pump or your water seals are worn. If you get an initial jolt of pressure when you squeeze the trigger then we know the problem lies in the unloader valve and you will need to purchase an unloader valve repair kit. If not you will more than likely have to replace the valves and seals in the pump.

Sincerely,
Aron Kerr
Landa Northwest
www.landanw.com

Mar 06, 2011 | Karcher 2500 PSI Pressure Washer

1 Answer

Not sprayer engine stop


This is an indication that the unloader not working properly. When you release the trigger the unloader senses the increase in pressure and bypasses the water into the water inlet. When the unloader is not working and you release the trigger, the water pressure builds quickly and overcomes the power of the engine shutting it down. Here is the manual for your machine, http://www.pressurewashersdirect.com/manuals/Simpson_WaterBlaster%20manual_2.pdf

and some information about troubleshooting from the manual.
"Not Unloading. Leak in Gunvalve or Hose. Repair gun leak . Replace leaking or broken hoses. Debris or wear in Check Valve. Remove Check Valve parts and clean. Check O-Ring. Reface with emery cloth, or replace checkvalve. Damaged Piston U-Cup. Rebuild Unloader Valve (Service Center)."
Usually when the unloader fails the pressure regulator will most likely need to be replaced as the unloader is usually incorporated within. For now try lowering the pressure some and just tie the trigger open untill you can service. Good luck.

Jul 14, 2010 | Simpson WS4050V Water Shotgun 4000 Psi...

1 Answer

Brand new machine and it ran fine for the first 5 minutes then when I squeeze the trigger now the pump takes a second to click on then when it does the engine stalls


Sound like you need to replace the unloader valve,or take it apart and free it up,lube the seats and o rings and retry the washer to see if it works.The valve has the pressure regulator in it so the knob that you adjust the pressure with needs to come off and then just unscrew the unloader valve.

May 09, 2010 | McCulloch FHH25A Gas Pressure Washer

1 Answer

Once the trigger is released it won't starting spraying again.


I have the same problem. This is the responce for Karcher......

The unloader valve may be sticking, or is dirty. It probably needs to be cleaned and may need to be replaced, it is inexpensive. It gets a lot of use, but extends the life of the pump. The function of the unloader is to allow the machine to run in a bypass mode while the trigger of the gun is closed. First, a lack of high pressure can be caused by: 1. Insufficient water feeding to the unit, so check that the water is turned on all the way and that there are no kinks in the hose. 2. The inlet filter may be clogged. (it will need to be removed and thoroughly cleaned). 3. An internal water leak. 4.Also, low pressure can be caused by worn spray tips. If you have checked the first three with no resolution, the problem is internal and could be as simple as a sticking unloader valve. If you are mechanically inclined, you can clean this valve yourself and greasing the o-rings (use lithium based grease), or take it to a local service center. You do not need to take the pump apar
t. The unloader valve is located under the cover, and is secured with 2 bolts. (Use needle nose pliers to remove the valve) For those units with pressure and volume controls, the unloader is located under the pressure and volume control knobs themselves. Do not take any other bolts off or you will open the pump and lose the pump's oil.

Note: Lithium based grease will prevent future failure of the unloader valve.

Also, check websites such as fixya.com for tips and how-to info particularly on cleaning the unloader valve. Be sure to use lithium grease if you reassemble it.
I am going to check the manuel to see where it's at

Sep 24, 2009 | Karcher 2500 PSI Pressure Washer

1 Answer

I'm loosing air on my 3hp air compressor, as soon as i pull that trigger on my compressor for about 2 second it looses air. No holes in the air hose nothing is wrong but just loosing air


Are you talking about the power switch or the trigger of an air tool?
If it is the power switch then how much air are you losing?
At start up most air compressors will lose a small amount of air through the unloader valve. As the compressor builds psi this valve will close. Once the max psi is reached the motor will shut off then a few seconds later the unloader valve will open again releasing the pressure in the cylinder. If your leak does not abate as psi builds you might need to replace your switch and valve.

Mar 26, 2009 | Air Tools & Compressors

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