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Low pressure; as if the pump is not pumping. Been through the unloader, filter, check valves, etc

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VANES MAYBE CLOGGED, TRY SPRAYING IT WITH PB BLASTER IN THE WATER INLET TUBE & LET SOAK 15-20MINUTES.

Posted on Nov 08, 2010

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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

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My swiss craft 6.5 pressure washer runs but hat no pressure???


-hello
It sounds like your problem is within the pump. First thing to check is while it is running, look between the pump and engine. There should be a small area or hole where you can see the crankshaft turning. Make sure that it is in fact turning the pump shaft. If it isnt then your key on the crank shaft is sheared and you just need a new key. This probably isnt the situation though. More commonly the problem is going to be the unloader valve on your pump and/ or the shutter valve. You will have to google a parts breakdown of your pump. Since the engine is a copy of a honda then I assume the pump is probably a copy of something as well. Parts may not be readily available. First though, on the outlet of your pump should be either a nipple or a quick disconnect. Either way, remove the piece. Inside should be your Shutter valve(looks like a small bullet) and a spring. Make sure they are good. Look for a broken spring or oring on the valve and replace if necessary. If you have to examine the unloader. Remove the entire unloader assembly. examine and look for trash stuck in it. broken orings, etc. You may have to replace if the problem isnt evident. I would recommend a service center as the unloader being improperly installed can cause damage to your pump,. Good luck How to test and install an unloader for pressure washing with Larry... or
Check Unloader

Feb 25, 2015 | Garden

1 Answer

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.

Feb 17, 2014 | Comet Pressure Washer Hw3540s Triplex Pump...

2 Answers

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
Bud

Mar 28, 2013 | FAIP Powerwasher Universal Pressure Washer...

2 Answers

I have a vt631401aj campbell hausfeld compressor. when it builds pressure to 135 psi, the compressor shuts down and immediatly starts dumping air until it goes down to 90 psi. It then stops dumping the...


John: I had a similar problem with a brand new CH-made compressor. The problem was not with the unloader valve, but with the check valve located where the air from the pump enters the tank. The check valve was not seating correctly due to brass filings from manufacture. The defective check valve was allowing air to escape back the wrong way from the tank to the pressure switch and through the unloader valve. This backflow from the tank would start to happen when the pump stopped after reaching high pressure. The back flow would continue until the pump restarted at the low pressure point. This cycling would continue as you described. Once I cleaned the check valve, everything (including the unloader valve) started working correctly. I hope this helps. And remember, don't work on these when they are under pressure and always wear safety glasses.

Sep 18, 2011 | Campbell Hausfeld Air Tools & Compressors

1 Answer

We have a new honda gx390 pressure drain cleaner with bertolini pump we can not get max pressure to the hose can you help


Assuming that you have a pressure gauge to determine actual system pressure. Without pressure gauge, you could use the sound of the engine as test for capacity pressure (if engine and pump are paired correctly, engine will labor at full throttle under high pressure). Using your machine at rated capacity will decrease the life of the unit. Better to use at 75 ~ 80 percent of cap. (2500psi on your unit). Pressure is developed thru the restriction of the tip/orifice assuming that the pump is working correctly. Tip should be correct for the capacity of the pump. Check the pump capacity for gpm (or test by removing tip connect water supply, then with engine running, catch water in bucket for exactly one min. and measure quantity). Example, 4 gallon per minuite should use a tip with 4gpm markings. If wrong tip size is used, (too large, low pressure, too small, pump will go into unload condition resulting in low pressure) . If thru testing you determin that the correct size tip is installed, suspect valves or unloader. Leaking valves or orings that seal valves will cause low pressure and also cause a pulsating sensation. Worn unloader will cause pressure to rise and fall in a slow cycle. Good luck with your repair

Apr 26, 2011 | Honda Pressure Washer PSI 3000

1 Answer

Karcher G2600 VH - low water pressure


If the spill valve activates is "spills" water under the washer. There is a restriction or the pump has become inefficient and will not pump the volume and pressure it should at full RPM.

Jul 20, 2010 | Karcher G 2000 MK 2000 PSI 20 GPM 87cc Gas...

1 Answer

Compressor wont restart because of head pressure


Piston air compressors have to unload to permit a restart, the two mot common types are an unloader valve or free air unloaders.

with an unloader valve this system uses a check valve mounted in the discharge line as it enters the tank, when the pump stops this check closes and does not permit the tank pressure to return to the pump. a unloader valve also opens to allow air pressure in the discharge line to vent, this valve is either on the pressure switch or on some models is on the pump, and is a centrifugal type.

Free air unloaders or head unloaders are a set of fingers that hold open the intake valves on the cylinders to permit the piston not to pump air against a head load, and once the pump is running the fingers retract to allow the pump to function as normal.

Jan 19, 2010 | Air Tools & Compressors

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

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