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Straight out of box Dewalt 3800 psi washer.. waters blows both on full power and off without depressed trigger how do I stop this

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  • Dewalt Master
  • 35,672 Answers

If it is "Straight out of box", you may have to return it as defective.

Posted on Apr 14, 2017

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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nc_dog
  • 1 Answer

SOURCE: Whirlpool LSQ8543JQ1, washer stopped

Pretty much exactly what guest above me said. I have a lsq8543jq1 also, was stopping after agitation.

At first thought it was something more serious, since the dial seemed to make a humming/grinding/buzzing noise when it was switching to agitation cycle, but that seems to just be a timer before the drain/spin cycle kicks in.

I had a washer full of water, so rather than wait till I could get a part (or hand drain -what a pain), I just grabbed a paper clip and rigged the switch so it thinks the door is shut and voila, drains and finishing cycle as I type.

The switch is a safety device to prevent accidents; bad injuries could result if the door is opened while the washer is in spin cycle. I don't recommend this as a long term solution - especially if you have kids. I have 2 and will be ordering the new part asap.

Posted on Nov 13, 2008

rockitman187
  • 2559 Answers

SOURCE: Cannot rotate the Dewalt 708 mod 3 saw horizontally

If you have loosened the handle a little and pulling the adjustment trigger didn't allow for movement,you may need to remove and clean the turn table.(don't forget,the handle must be loosened for the turn table to rotate)



Please rate this a fixya

Posted on Feb 09, 2009

  • 12 Answers

SOURCE: Pressure is fine when first started ,if trigger released no Psi

Your uplift injector valve in the water pump is sticking. You need to remove this part. Lube the top o-ring only with a water proof grease. Reinstall this part. You will be up and running again.

You need to use needle nose vise grip tool to easily remove the valve. You need to grind down the vise grip tool to fit the opening where the valve is installed.

To prevent this problem from reoccuring use a pump guard additive.

Posted on Apr 06, 2009

  • 5 Answers

SOURCE: Need to lower 1750 psi to 300 psi on my portable power washer.

Don't starve the inlet to the pump. It will detroy it.
Buy a pressure regulating valve and plumb it in line per the instructions. Do not use a relief valve because you will have to have a return line or you will heat the water up on the inlet side of the pump depending on how the pressure washer is set up. It should already have a safety relief valve. You might look and also find a pressure regulator that is adjustable and all you problems will be solved.

Posted on Apr 25, 2009

motorhead427
  • 24 Answers

SOURCE: 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.

Posted on May 30, 2009

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1 Answer

The engine runs but the water will not come out under pressure


You must have blown out the cones (thats how the water gets compressed inside of pump) in the water pump-

You could try this though on the back of the washer right on top of the water pump is a black knob about the size of your hand that knob will adjust the pressure try turning it and see although I doubt that is the problem-

A pressure washer is not like a compressor you HAVE to pull the trigger every minute NEVER let it just sit there running without pulling the trigger to release the pressure that Dewalt 3800 psi washer you have is a great machine in fact we own 4 of them and they are pretty powerful and easy to damage if left running alone.

TY,

Perry Tradesman

Sep 05, 2014 | Dewalt 3800 PSI Pressure Washer

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Dewalt 3800 psi


You checked the output to measure 5 GPM? How are you feeding that unit? What are you using for detergent? Have you adjusted the bypass valve?

May 04, 2013 | Dewalt 3800 PSI Pressure Washer

1 Answer

Water goes thru. have hydrulic oil to level. gun semas to stick on. NOT GETTING ANY PRESSURE AT NOSSEL.


Hydraulic oil?
Is this a pressure washer?
Pump should be half full of SAE20 or SAE30 non-detergent motor oil.
Engine should have 10W30 motor oil.

If you have a pressure washer ... and not water is coming out end of gun:
Take all hoses off machine.
Look at incoming water hose connection.
The should be a filter washer.
Clean or replace filter washer.
Hook up water and turn on water.
Water should come out other side of pump.
Turn on power washer and see if water coming out of pump is pressurized.
Now hook up pressure hose without gun.
Turn on pressure washer and see if water comes out of hose and is pressurized.
Finally, the gun may be bad.
We used to replace guns when they went bad.

Oct 24, 2010 | Dewalt 3800 PSI Pressure Washer

1 Answer

Got a Dewalt 3800 PSI Pressure Washer with 4.0 GPM with a Honda GX 390 gas engine. Tipped it up to roll it out to my truck and got a big puddle of water with what looked like Pump oil in the puddle. Can...


Could very well be. Did you check the oil level and condition of oil? If its too full or if its light brown milky, then water has entered crankcase. Pressure washer pumps cannot stand to ever let run dry. Even a little. Also excessive idling will overheat pump if it doesn't have a thermostatic relief valve that allows some more cool water to enter pump.If it doesn't have one add one. Find your PUMP mfg and model number. IF it's pumping good now and no leaks, quick replacing the seals will save big future repairs. www.pressure-washer-parts.com has lots of info on many pump manufactures. Or get some seals from dewalt.

Aug 11, 2010 | Dewalt 3800 PSI Pressure Washer

1 Answer

Got a new 3800 and was using it when it quit making pressure there was water coming out the blow byit just quit ,what the heck?


Were the lines connect to the valve connection box that a 2x4 or some other type of wood (dead blow hammer is best to use) and rap on it a few times. Generally the internal valve will stick causing this problem. If it does begin to work it will be needed to be taken apart and cleaned. Have Vaseline aroujnd to relube all items before re-assembly.

Jun 18, 2010 | Dewalt 3800 PSI Pressure Washer

1 Answer

DeWalt 3800 Pressure Washer Runs 20 min then quits.


I have the same problem and even have the issue with gas cap off.

Sep 24, 2009 | Dewalt 3800 PSI Pressure Washer

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