Question about Dewalt 3800 PSI Pressure Washer

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Low pressure I have dewalt 3800 pressure washer and it went from working fine to a bit more pressure than a garden hose. The screen is clear at the water intake witch leads me to think it's the cat pump,but how do i know.

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  • timrobert286 Feb 03, 2010

    figured out the problem. The increase and decrease knob with the high pressure re leaf spring port had a little piece of metal keeping the re leaf valve from seating. Thanks for the reply though.

  • loadedhog May 11, 2010

    hello.... have you removed the nozzle from the end of the lance to allow full flow, to flush it out? Change nozzles, still low pressure? Is there milky oil in the pump? How much pressure and flow is coming from the garden hose? This would help isolate the problem to know...

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Hi some valves at cat pumps need a 100 psi pressure to open and close correct. when there is air in the pump the valves wil not open and close till air is bleeded. take of highpressure hose, open watertap and bleed pump till no more air comes out. reconnect all hoses and try again. if there is no more air in the pump and its still not working, i should think its the pump.

Posted on Feb 16, 2010

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1 Answer

What type of oil do i use in a dewalt 3800 pressure washer


in the enginge you can use a standard 4 stoke engine oil.
in the pump you can use hydraulic oil

Dec 05, 2010 | 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

Dewalt Pressure washer keeps shutting off for no reason. plenty of gas and oil, water running to it. starts fine and as soon as I start spraying it shuts down.


Had a similar issue with my dewalt 4200 pw. Unit starting shutting off after spraying for about 5 min. Then difficult to restart, but would start again eventually only to shut down a few min later. Had new engine oil, new pump oil, good gas. I changed the spark plug and unit runs great again!

Aug 08, 2010 | Dewalt 3800 PSI Pressure Washer

2 Answers

John deere 3800psi pressure washer will not siphon detergent. the water end does fine but cannot get any soap


The only way the washer will draw soap into the line is with either the black tip installed or with no tip in wand at all.There is a ball and spring inside of the pipe that the siphon hose hooks to so when you use the washer with alot or even a little pressure the ball is forced up and blockes off the soap inlet port.So if you use it with no tip in the inlet port is open cause the ball isnt being forced up by back pressure.I hope this makes sense.

May 18, 2010 | Dewalt 3800 PSI Pressure Washer

1 Answer

My soap will not come out of the hose. What do i


several things to check, soap only works with low pressure tip installed, are you using correct tip? second issue is on bottom of soap tanks some have a small valve , is it open? is the tube blocked with dry soap or contamination, flusk it with water to be sure.

Apr 23, 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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