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How do i release the pressure when the unloader valve is stuck

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Start by removing the garden hose. Now you must CAREFULLY unscrew the high pressure hose and it may be necessary to use vice grips.DO NOT attempt to disassemble any of the pump when it is in high pressure.

Posted on Jul 15, 2009

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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

2 Answers

What is a bypass unloader


According to epowerwash.com:
"The unloader valve diverts water flow into bypass when the trigger gun valve is closed. Unloaders may be designed to respond to either an increase in pressure or a change in flow. The unloader valve may also be used for variable pressure adjustment."

More information here:
All About Unloader Valves ePowerWash

Jun 06, 2014 | Alfred Karcher Pressure Washer

1 Answer

Air compressor not unloading


Check the pressure switch. The unloader valve is actually in the pressure switch where the small air line from the tank check valve attaches to it. When the pressure switch turns the motor off it then lets the head pressure bleed off so the motor can restart the next time pressure drops in the tank. If it's not working and bleeding off the head pressure the cold start valve (the one with the pin in it) also won't open so the motor can restart and warn up properly.

Sep 09, 2012 | Dewalt D55153 1.1 HP Continuous 4 Gallon...

1 Answer

I have a Craftsman compressor Model # 919-15292 2. The compressor stopped building pressure because air was continually being released through the unloader valve. I have replaced the unloader valve,...


you must have wired the new pressure switch incorrectly .when the pressure switch opens it will release the head pressure so your compressor must be running with the pressure switch contacts open should be 4 connections 2 marked motor which is from your compressor and 2 marked line which is your power coming in

Jun 15, 2011 | Craftsman 33 gal Air Compressor 6 hp...

1 Answer

Pressure washer starts fine and sprays fine but will not continue to idle after nozzle trigger is let go. Have to have trigger pulled to start & cannot let go without unit stopping.


The pressure unloader us usually the first part/s that fail. An unloader can fail resulting in no or very low pressure or good pressure, however will not unload when trigger is released and stall the motor. Look at breakdown for your pump and determine if unloader parts are available and reasonable. If too costly to replace these parts then install an ez start valve to help start engine and tie back wand handle to deal with unloader problem (workaround). Ez start valve can be seen here:
http://www.cmcpwe.com/accessorystartvalve.html

When not in use, store washer with oil in pump to displace the water. The oil will help lube internal parts and possibly cause the unloader to begin working (if stuck due to debris/rust). You can find a gizmo to help you feed oil into pump on ebay /other web locations. Good luck with your repair.

Apr 27, 2011 | Dewalt DPD3100 Gas Pressure Washer

1 Answer

Craftsman gas powered pressure washer kills motor when you release wand trigger.


The unloader/bypass valve is jamming or defective. When you are not pressing the button the water is directed through the unloader valve/check valve to recirculate.It is common for them to corrode or for the spring to break.If it has an adjustment screw on the unloading valve for unloading pressure make sure you count the turns before disassembling it to make sure you dont over pressurize it.It is not opening causing the engine to choke out.Please let me know if this helps

Jan 19, 2011 | Garden

1 Answer

My pressure washer won't stay running when I release the wand trigger


The pressure relief valve must be stuck. That is the part with the black knob were you adjust pressure. If it can't "unload" so tghe wagter has no where to ok, and then the pump will stall. You may be able to disassemble valve, soak in vinager or mild acid, rinse well and reassemble

Aug 18, 2010 | Honda Garden

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

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


Unloaders fail due to carbon deposits on seat. Unloaders can be found in the head or in the tank. Failed unloaders /check valves cause the motor to strain but rarely prevent pressure from building. Events that prevent pressure from building are as follows: restricted intake; cracked or dirty valves in the head; gaskets torn or burned causing pressure to be redirected into the intake. Root problem is caused by carbon deposits and heat. Carbon can be formed if oil is drawn into cylinder due to worn rings or the wrong kind of oil is being used. Compressor oil is formulated to prevent carbon. Engine oil will cause heavy carbon deposts. Replace gaskets worn or broken valves and bad check valves to restore pressure. enjoy

Nov 04, 2008 | Ingersoll Rand Type 30 Electric Driven Two...

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