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No Pressure I was rebulding my pressure washer pump on a troybilt pressure washer, and I can't seem to get the unloader seat out of the aluminum housing. Thanks foer the help.

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I usually take a screw that is about the same size as the hole, screw it on the seat and then pull it out by the screw.

Posted on Nov 21, 2009

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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."
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B&E pressure washer w/ comet 3540 pump


Things to check:
1) is water coming out of the bottom of the pump or is the oil in the crankcase high level and milky yellow. If so your seals are bad.

2) Your check valves might not be seating properly. A couple of fouled check vavles will cause either no pressure or pulsing pressure. A good inlet water strainer keeps foreign matter out of valves. But valves do wear out and get build up that keeps them from working right.

3) Your unloader valve might be worn or fouled. Bad unloader would usually show as low pressure ( but more than hose pressure) or low volume out the trigger nozzle.

Valves are your most likely problem.

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My Husky Pressure Washer bogs the motor down immediately upon start.


Rebuilding the pump is not easy. Did you use the right seal drivers? Lube the seals when you installed them? Use a torque wrench? But a valve in backwards?

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Power washer not spraying hard


Hi Mike
You could have one are two problems with the pressure washer.
1...pump for pressure washer worn and needs washer/seal replacement.
2...Need to adjust the pressure discharge relief valve to the needed pressure.
Please take time to rate me
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Mar 28, 2013 | FAIP Powerwasher Universal Pressure Washer...

1 Answer

My Honda pressure is stuck in low pressure mode. How can I get it into hogh pressure mode?


You should check your pressure washer without the hose on it to make sure the gun isn't clogged. If the unit still sprays at low pressure with the gun and hose removed then most likely your unloader valve is stuck open. You can lookup a parts breakdown for the pump on your unit and locate the unloader so you can remove it and clean and lightly coat it with silicone grease. Then a dozen quick load/unload cycles should help properly seat the unloader parts.

Oh...and if the unit does make full pressure with the gun and hose removed you should take the hose off the gun and see if there are any obstructions in it. Hard water, corrosion, stones....something needs to be cleared!

Take all safety precautions while handling your washer! Good luck!

Nov 17, 2011 | Honda Garden

1 Answer

Pressure off and on every few seconds with my karcher 3000BH


hi there rjcomer2

here is web site for parts
http://www.ereplacementparts.com/karcher-2500-11944010-pressure-washer-parts-c-33388_33389_33973.html

sounds like you have a unloader valve problem or a crack in the pressure manifold housing between pressure outlet and unloader valve assy allowing unloader to cycle on/ off

or some dirt trapped in the unloader valve seat , make sure you have good supply of water - ie good flow from tap to pump

try cleaning unloader 1st and fitting in line tap filter

hope it helps

pauly46

May 20, 2011 | Karcher 2500 PSI Pressure Washer

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

I have a troybilt pressure washer when i crank it up it builds pressure when i engange the pressure it takes about 5 seconds and pressure goes away if i let off the trigger it will build pressure again it...


Unloader valve is the most likely suspect here.
Remove and clean with penetrating oil then reinstall.

Also add some LIGHT oil into your supply hose via a small funnel. 3-in-1 household oil or power steering fluid lubricate the valve and pump quite well. Three or four treatments of a couple ounces each will usually make the pump happy again.
Hope this helps!

Sep 27, 2009 | Garden

1 Answer

Where is the unloader valve on my pressure washer


is not necessarily a cap, but could be a screw in plug, that should be close to the hose hook-up on the pump Inside there there should be a round ball and a spring that you can tighten or loosen to adjust the unloader and if it has been used ALOT, where the ball seats there could be grooves cut in there and you might need to get a valve kit to fix it

Sep 05, 2009 | Karcher 2500 PSI Pressure Washer

1 Answer

NO PSI


have you checked to make sure that keyway is installed between electric motor and pump. also adjustment on unloader valve may be incorrect. If the big brass nut on the unloader is able to be turned by hand, then this is probably your problem (running pressure and spike pressure needs to be set and locked down using a pressure guage). does water come out of nozzle at all? if not, tip being stopped up may be the problem. trash between unloader ball and seat can also cause no pressure (usually caused by a burr left inside brass pieces during the manufacturing process). I have seen all the check valves stuck on a brand new unit from sitting on the shelf for so long, but this is usually the case with General Pumps.

Jan 07, 2009 | Northstar Pressure Washer 3000 PSI

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