Question about Dewalt 3800 PSI Pressure Washer

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My dewalt 3800 dont have much oressure and is under a load when not pulling trigger

Why don't my dewalt 3800 have any pressure

Posted by Anonymous on

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 1388 Answers

SOURCE: I have a dewalt 3750

I worked at a tool rental center while attending college and learned many tips and tricks about Dewalt and other brand pressure sprayers. Your machine probably has a 13 hp honda and has max pressure of about 3500 to 3700 psi. Most of the problems that customers had were engine related due to severe working conditions including totally wet engine /plug, wet air filter, and or other problems that were easy to remedy. We would set the pressure regulator to minimum pressure and explained to the customer how to increase the pressure as necessary but only after the engine was completely warmed-up to running temp to prevent engine stall. Your machine has a throttle lever between the tank and carb that should be set to max if you are going to set pressure at or neer max range. Most cleaning jobs do not need much pressure. Use lowest pressure to get the job done. Your engine developes around 13hp at about 3600rpm. If you want to maximize the life of you sprayer, then use your machine at about 70% of capacity or about 2000 to 2500 range that will allow you to run your engine slower increasing lifespan. Your sprayer is likely rated at 4 gallons per minute so make sure that the tip is that capacity. The tip has the size stamped which would show the fan degree and flow in gpm. The wrong tip, say a 3.5 gpm will strain the engine to point of stop because the smaller tip increases pressure. Most engine stall is due to high pressure setting on new machines. Lower pressure when warming-up machine and use max pressure rarely when necessary to max life. Please email for other information/questions or simple tests to determine faulty parts, good luck.

Posted on Jan 30, 2009

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  • 243 Answers

SOURCE: low pressure

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

  • 8 Answers

SOURCE: Too much pressure.

You need to keep the trigger pulled every time you start and you need to run the water for 3-5 minutes wide open before you start. Zero air should be in the line or this could cause it to **** out. You probably damaged the pump at this point.

Posted on May 27, 2010

puertobori
  • 7733 Answers

SOURCE: Dewalt 3800 PSI operates great

When you pull to start squeeze the water hose tigger until start.

Posted on Oct 03, 2010

  • 57 Answers

SOURCE: what type of oil do i use in a dewalt 3800

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

Posted on Dec 20, 2010

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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

2 Answers

Won't start


Are you saying that it WONT start or that you cannot pull the rope to get it to start?

May 15, 2013 | Dewalt 3800 PSI Pressure Washer

2 Answers

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

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

Too much pressure.


You need to keep the trigger pulled every time you start and you need to run the water for 3-5 minutes wide open before you start. Zero air should be in the line or this could cause it to **** out. You probably damaged the pump at this point.

Apr 27, 2010 | Dewalt DPH3100 Gas 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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