Model # DXPW4240

Internet #203185026

Store SKU #933063

Store SO SKU #933063

DEWALT Honda GX390 4,200 psi 4 GPM Gas Pressure Washer


Honda GX390 4,200 psi 4 GPM Gas Pressure Washer

  • Reliable high performance premium HONDA GX390 Engine
  • Maintenance free AAA Triplex Pump made by Comet
  • Steel-Braided Quick Connect high pressure hose
$999.00 /each

Frequently Bought Together

Product Overview

DEWALT machines are guaranteed tough. Built tough to meet the rigorous demands of the cleaning professional or anyone who expects the most out their machine. Perfect for deck cleaning, wood restoration, paint preparation, graffiti removal and all other professional cleaning services. Our gas-powered machines are equipped with Honda GX OHV commercial series engines. These engines set the standard for durability and long life. The Honda engines are paired with AAAindustrial triplex plunger pumps, a brand with a history of over 40-years of innovation. AAATM pumps are equipped with PowerBoost, this patented technology delivers higher pressure to the spray nozzle, resulting in greater impact and cleaning performance. Exceptionally strong welded steel frame body and pneumatic tires for mobility across most any surface. Pro-style quick connect spray wands and nozzles, with professional spray gun, allows users to operate with ease. High pressure hoses are non-marring, kink and abrasion resistant and utilizes poly and/or steel-braid technologies for exceptional strength and long-life. For those extra dirty jobs, drop the detergent siphoning tube into pressure washer safe detergent and attach the soap applicator nozzle.

California residents: see   Proposition 65 information

  • Honda GX390 OHV commercial series engine with oil alert starts easy, runs smoothly and delivers high output - engine oil is included
  • AAA by comet industrial triplex plunger pump with ceramic coated pistons and adjustable unloaded for controlled pressure
  • 3/8 in. x 50 ft. high pressure steel-braided hose is non-marring, kink and abrasion resistant and equipped with quick connectors
  • Welded steel frame, steel engine plate, solid steel axle and 13 in. pneumatic tires for extreme durability and effortless maneuverability
  • Pro-style spray wand with 5 quick connect nozzle tips - 0 Degrees , 15 Degrees , 25 Degrees , 40 Degrees and soap applicator nozzle
  • Professional spray gun with side grip designed to be comfortable and easy to operate - safety lock to prevent gun from being accidentally activated
  • Convenient on-board accessory storage for spray gun/wand, high pressure hose and nozzles
  • Downstream detergent injection system for convenient use of cleaners
  • Limited warranty, commercial use 3-years on Honda GX engine, 5-years on AAA pump, 10-year frame components, 90 days on spray accessory items
  • Note: product may vary by store
  • Choose the best nozzle that fits your pressure washer needs:

    Pressure Washer Nozzle Selection Guide

Info & Guides

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Name Honda GX270 3,800 psi 3.5 GPM Gas Pressure Washer Hydro Pro Series 4,500 psi 4.0 GPM AR Tri-Plex Pump Electric Start Gas Pressure Washer with Panel Mounted Controls CARB Honda GX390 4,200 psi 4 GPM Gas Pressure Washer Honda GX390 4200-PSI 4.1-GPM Terrex Annovi Reverberi Triplex Pump Gas Pressure Washer
Ratings (111) (16) (91) (3)
Maximum Pressure (PSI) 3800 4500 4200 4200.000
Pressure Washer Power Type Gas Gas Gas Gas
Commercial Yes Yes Yes Yes
GPM 3.5 4.0 4 4.1
Included Onboard cord storage,Wheels Onboard cord storage,Wheels Onboard cord storage,Wheels Wheels
Refurbished No No No
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Warranty / Certifications

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Customer Questions & Answers

Will the unit come with oil?

When purchasing new in box, will the unit already have oil in the engine and some fuel in tank? Also, does it come with the detergent siphoning tube?
Asked by: Damian
Yes, all Dewalt preessure washers come with a container of oil. They also come with a chemical siphon tube and filter.
Answered by: DJH1916
Date published: 2017-03-20

My Dewalt DXPW4200 PSI pressure washer only puts out 3200 psi

The adjustment knob is turn all the way down and it puts out only 3200 PSI. I can't find out how to turn it up. I paid for a 4000 psi washer not a 3000 psi washer need help. When I first used the Dewalt DXPW4200 it seam low on PSI. I ordered a inline gauge to check the pressure to see if I was right and I was.
Asked by: JKR
I took the pressure reading from the pump outlet. I also took a read at the was the same.
Answered by: JKR
Date published: 2016-12-17

What oil do I need for machine

Asked by: Moris
Answered by: chuchin45
Date published: 2016-08-21

how many horsepower is the engine?

Asked by: Richard
GOOD QUESTION,,,, I don't know I know years ago there was a class action suit against engine manufactures for over inflating there horsepower numbers.. I guess it's easy to boost the sticker number to a "higher number" -- CID or cubic inch displacement is a fair start towards an estimation -- Ask a lawn mower place and get there opinion ? -- Due some research on the web ?
Answered by: ganu
Date published: 2016-09-28
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Customer Reviews

Honda GX390 4,200 psi 4 GPM Gas Pressure Washer is rated 4.3 out of 5 by 91.
Rated 5 out of 5 by from GAS CAP Unit started to SURGE,, or hunt in it's RPM. Thought it pointed to a governor problem . This problem occurred after only the second tank of gas,, very odd, to say the least, on a 3 hour old unit One will be surprised what the problem was,,,, ""The Gas Cap"" The gas cap is a two part pressed together unit that apparently has some type of filter and/or sound damping inside it (weird) .. Not sure what the purpose is to design a cap like this In any event, the cap "prevented" air from entering the tank,, meaning that the tank eventually became enough negative pressure (vacuum) to hold gas back from gravity feeding the carb Take the gas cap off, and the unit runs normally,, Put the cap snuggly back on and the unit will hunt / surge , and I'll assume stop due to lack of,, or no gas being fed to the carb Fixed it by drilling two .200 dia holes on the bottom side , near the outside edge without drilling through the top surface I Now assess that what's inside the cap is ground carbon, similar to a water filter (activated carbon) (it's in granular form) similar to sand, That prevents gas fumes from escaping to apparently make the unit as safe as possible Doing this vented the tank to atmosphere Although,,,, most of this granulated carbon has bounced around and vibrated itself down the center hole and into the tank itself. A very fine inside tank filter prevented this carbon sand from going into the gas line post the tank Will need to pull the tank off to rid the particles out ,,, and clean the gas cap out of all remaining particles,,,or buy a different type of cap that will fit Conclusion : Bad gas cap design Other wise this is a powerful, well built unit, and I don't care if some say it's heavy
Date published: 2016-09-28
Rated 5 out of 5 by from After using the Dewalt 4200 psi power washer for a few months now. It been working flawless. I us... After using the Dewalt 4200 psi power washer for a few months now. It been working flawless. I used it cleaning my tractors , concrete, metal roof on carport and cleaning out clog drains with a jetter. Just use the right tip for the job and you are good to go.
Date published: 2016-11-11
Rated 5 out of 5 by from High Pressure I was hesitant to get this due to the price, but WOW, if you want something cleaned, this will clean it. It comes with 5 different nozzles to control the spray, which is good because this machine can take the paint right off my boat!
Date published: 2016-10-18
Rated 5 out of 5 by from Dewat pressure washer This pressure washer is good machine and working perfect
Date published: 2016-11-02
Rated 1 out of 5 by from I would not recommend this product. I use it to pressure wash driveways for my business. I have... I would not recommend this product. I use it to pressure wash driveways for my business. I have not even had it for 60 days and the pressure regulator isn't working correctly and the little connector that you use for soap actually blew off of the pump. This unit doesn't even compare to the old Dewalt 3750 psi, 4gpm unit.
Date published: 2016-11-26
Rated 5 out of 5 by from Great washer Washer has plenty of cleaning power. Easy to roll on uneven surfaces​. Large fuel capacity. Fueled it up and added the oil,it started on the 3rd pull . It died out when I squeezed the wand.I restarted it and let it warm up and has worked and started great since. The only wish I would have is an easier to use hose. The hose is stiff and hard to roll but I guess that's part of having a 4200psi washer.
Date published: 2017-03-21
Rated 1 out of 5 by from Buyer beware! The Honda engine is perfect. The pump is the problem. I have owned this machine for 3 years I'm on the forth pump. AAA pumps are cheap! If you use this once a year you might get 5 years. Don't waste your money. Buy a washer with a Cat pump. If not just flush your $1000 down the toilet. You have been warned.
Date published: 2017-03-03
Rated 5 out of 5 by from Great set up easy use and pump parts are easy... Great set up easy use and pump parts are easy to find and replace. Have bought 4 of these units and they are all still running. You can use the Honda engine with a triplex pump with a pulley system. Unfortunately the shaft driven pump parts wear out from a commercial industrial use stand point.
Date published: 2017-03-14
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