About the Post

Author Information

Dewalt 3400-PSI 2.5-GPM Gas Pressure Washer

Guaranteed Tough


Pressure washers come in a wide variety of quality and costs.  This Dewalt pressure washer is a high end home owner or mid-grade commercial unit that is outfitted with a Honda GX200 engine and a AAA triplex pumps.  The big item to me is the triplex pump that allows for more pressure and is also maintainable. While many are not into changing oils and being able to see what is going on inside a pump, I am all for it.  I appreciate the opportunity to maintain and protect my investment.  This unit is great for deck cleaning, wood restoration, paint preparation, home cleaning, automotive cleaning and many other cleaning services. Also, the Honda GX series motors are commercial grade and in my opinion, the engines that are still built on the reputation that Honda engines acquired over the years.

Features & Specs

  • HONDA GX200 OHV commercial series engine with Oil Alert
  • AAA Industrial triplex plunger pump with ceramic coated pistons and PowerBoost technology
  • 1/4 in. x 25 ft. high pressure steel-braided hose is non-marring, kink and abrasion resistant, and equipped with easy twist-on connectors
  • Welded steel frame, steel engine plate, solid steel axle and 10 in. pneumatic tires
  • Pro-style spray wand with 5 quick connect nozzle tips – 0°, 15°, 25°, 40° and soap applicator nozzle
  • Professional spray gun with side grip and safety lock-out
  • Convenient on-board accessory storage for spray gun/wand, high pressure hose, and nozzles
  • Downstream detergent injection system for use of cleaners
  • Limited Warranty – Commercial Use – 3 Years on HONDA GX engine, 5 Years on AAA pump, 10 Years on frame components, 90 Days on spray accessory items
  • Fuel tank capacity 0.82 gallons

Honda GX Motors


Honda now makes a wide variety of motors and not all of them live up to the Honda name.  Many of the lower end pressure washers will come with a Honda GC motor that is not as good of quality as the GX.  GX-series engines have low-oil shut-offs, which prevent damage to the engine if the oil is run low.  The GC engine has an aluminum bore where the GX-series have cast iron bores, giving the Honda GX- engines a longer life.  You’ll find a lot of metal on the GX-series and plastic on the GC.  For commercial use, Honda warranties the GX-series engines for 36 months and the GC engine for 3 months.  The warranty length for commercial use should give you a hint at the quality difference.  Unfortunately, GX-series engines are generally made in Thailand where the GC-series engines are made in the USA (Swepsonville, North Carolina).  It is a big plus for this pressure washer to have the GX motor.

Starting & Use


Starting the Dewalt pressure washer is simple and easy.  The engine has a manual fuel shut off, throttle and choke.  It seems to start best at about 1/4 throttle and full choke and go to zero choke once the engine fires.  Once the engine has warned up a bit, you can open the throttle and start pressure washing.  The Honda motor starts very easily and usually fires up on the first or second pull.   This pressure washer is equipped with a AAA triplex pump with powerboost.  Triplex pumps allow the unit to use a plunger type system to get more pressure and most have a viewable window in the back that will allow you to quickly see what you pump oil level is at.  The pump also has the type of oil, amount of oil and frequency that the oil is to be changed on the pump.  This is nice to have on the unit in case you misplace your manual.  Be aware that you will not find the pump oil at Home Depot at this time.  You can substitute a diesel grade 15w40 if you cannot find the recommended oil.  Another bonus of this AAA triplex pump is that it has a thermal relief valve that will automatically release a small amount of water from the pump when it gets too hot.  This water is what cools the pump and it does not allow a user to overheat the pump by letting the pressure washer sit under load.


Quality & Enjoyment


The Dewalt DXPW3425 is a good unit that was put together with some thought.  It comes with pneumatic tires so it can be easily pulled around through uneven terrain.  The hose that goes from the pump to the want is pliable and kink resistant.  There is nothing worse than trying to use a pressure washer that has a stiff hose that forces you to constantly work to twist the wand to remove the circles in the hose.  The hose is also easily wound up for storage, unlike the more PVC like hoses on cheaper models.  There is a handle in the middle of the wand that can float around the wand to fit whatever position is most comfortable for you and the job you are trying to complete.  Five quick attach nozzles can be easily exchanged for use.  Finally, having a commercial grade engine and pump allow the user to complete proper maintenance on the unit is fantastic.  This is a great unit for the long term owner.


This is a great pressure washer and about the only feature that could make it better is an automatic idle down when the unit is not in use.  You do have a throttle control that you can manually idle down, but that is just not the same.  If you bump up a model, it does include the automatic idle down.  This pressure washer is in most Home Depot stores and online.  Check it out.

Buy HereDewalt 3400-PSI 2.5-GPM Gas Pressure Washer

Tags: , , , , , , , , , , , , , , , , , , , , ,

13 Responses to “Dewalt 3400-PSI 2.5-GPM Gas Pressure Washer”

  1. donnymcarter #

    Nice review John! I really like the Honda engine!

    September 18, 2015 at 11:02 pm Reply
  2. cory jurich #

    hi i purchased two dewalt 3400 psi pressure washers. i cannot get them started and they are brand new out of the box. i thought at first i over filled the oil so i drained some oil to about the halfway level of the clear oval oil viewing spot. is there anything else i can do to to check to get these running?

    May 18, 2017 at 10:22 am Reply
    • Royce #

      Turn the switch to the on position.

      June 2, 2017 at 10:00 pm Reply
  3. Todd #

    Started mine, brand new out of box. Worked awesome. Shut it down. Now it starts and runs perfect but won’t build pressure.


    June 4, 2017 at 2:56 pm Reply
    • Richard Lee Herron #

      I’m having the same problem. Starts up an runs great. But no pressure

      July 16, 2017 at 8:31 am Reply
  4. BRENNAN #

    I work at home depot tool rental. I repair tools and equipment for a living. These dewalt gas pressure washers are the biggest pieces of shit ever designed. I get about 9-10 of these in every week. The pumps go out, $200 for a new one, not counting labor, and the carburetors go out constantly. DO NOT BUY one of these, look into a Mi-T-M

    November 24, 2017 at 8:26 am Reply
  5. Ada M Fernandez #

    I just bought a dewalt 3400 and i noticed that it shakes a lot that it actually moves the washer to where ever . It seems that the vibration causes the unit to move. Can you tell me why it vibrates so much. Is it something i am doing wrong

    January 21, 2018 at 10:12 am Reply
    • It will vibrate, especially at idle. Are the rubber pads attached to the frame?

      January 23, 2018 at 11:55 am Reply
  6. Victor #

    For some unexplained reason, when I turn my 3400 psi Dewalt on, it runs for 10-15 minuets and shuts off. I restart it and it runs for maybe 3-5 minuets and shut off again. It’s probably a year old. Any suggestions or recommendations?

    April 18, 2018 at 10:45 pm Reply
    • Check to see if your gas cap vent is operational and clean.

      April 23, 2018 at 1:43 pm Reply
  7. akash #

    i bought new from home depot today and it wont start at all. i put new gas, added oil, put on choke, moved lever to 1/3 on speed, moved lever to gas on, and turned knob on on position as well and pulled rope many times and it wont start at all. seems like dewalt makes lot of lemon pieces. any recommendation how to start it. i will swap it with other at home depot tommorow

    September 16, 2018 at 8:59 pm Reply
  8. Michael #

    Garbage, garbage, garbage. There’s not really any other way to describe this pressure washer. I will never buy any power equipment from Home Depot ever again.

    June 6, 2019 at 7:44 pm Reply
  9. I bought a new Honda dealt pressure washer and ran it for about two hours. Put it up for about 6 month and it won’t start I had good pressure but not starting , it kept almost starting then it mad a air sound and nothing , I went to get a new spark plug pulled the starter and it started no problem but pressure wash not there and won’t start against. Any idea I cleaned the calibrator all new still.

    July 26, 2019 at 8:15 am Reply

Leave a Reply