About the Post

Author Information

DEWALT 4200 PSI 4.0 GPM Direct Drive Pressure Washer Review | DXPW4240

Serious Water Pressure

We are always looking at a new and improved version of a tool.  Sometimes it is a new battery power tool with more power or an upgrade for more user protection.  In this video and article we take a look at a DEWALT 4200 PSI 4.0 GPM Direct Drive Pressure Washer that has been on the market for some time.  This pressure washer has been built with quality products and it is meant to last.

We want to note that DEWALT makes this version with a direct drive pump or a belt driven pump.  As you get up in PSI, belt driven pumps are more popular because the belt does not transfer the vibrations from the engine to the pump, allowing for longer pump life.  Direct drive units, like the one in our video, are more popular with consumers due to then being less expensive and more compact.

The DEWALT 4200 PSI 4.0 GPM Direct Drive Pressure Washer is one of the most powerful models available at The Home Depot.  DEWALT used a AAA triplex pump made by Comet on this unit and it allows for the user to adjust the pressure by turning a knob on the pump.  We estimate the output to be from 2,800 PSI to 4,200 PSI.  Along with that adjustment, the Honda GX390 engine has a working RPM range of 2,000 RPM to 3,600 RMP, allowing you to decrease the engine RPM to reduce pressure also.

These adjustments are awesome and allow this very powerful unit to be used in many different cleaning applications.  If you are new to pressure washers, we recommend that you start slow and ramp up the pressure over time to save any destruction.  With the 0 degree tip, one can write their name permanently in concrete at full power.

DEWALT DXPW4240 Features

  • HONDA GX Commercial Series Engine.
  • Direct Drive Engine & Pump.
  • Triplex Pump Design with Ceramic Pistons and Thermal Relief Valve.
  • Adjustable Unloader system for added pressure control.
  • Welded Construction, 1-1/4″ Tubular Steel with Steel Engine Plate and Solid Steel 5/8″ Axle
  • 3/8″ x 50′ Non-marring Hose with Quick Connectors.
  • 5 Quick Connect nozzles (0°. 15°, 25°, 40°, & Soap)
  • Downstream Detergent Injection System.

DEWALT Quality

When a company like DEWALT has their name on a product, they want it to be quality!  Honda has a proven reputation for some of the best commercial engines on the market and the GX390 is an awesome engine with almost 12HP and 19 ft. lbs of torque.  While there is no oil filter, it does allow for 1.16 quarts of oil and it is easily changed.

The AAA Triplex pump has ceramic coated pistons and a thermal relief valve to allow for water flow when the pump is not in use and the engine remains running.  The oil level can be quickly checked through the sight glass on the rear of the pump.  The oil should be changed with a 15W-40 oil every 200 hours.

There is much more information on this unit in our YouTube video.  We highly recommend that you watch the video if you are looking for a new pressure washer or interested in this DEWALT model.

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

One Response to “DEWALT 4200 PSI 4.0 GPM Direct Drive Pressure Washer Review | DXPW4240”

  1. Shawn starks #

    #workshopaddict i need one badly. This looks nice

    July 26, 2017 at 12:53 pm Reply

Leave a Reply