RB 400 DIRT BOSS®


RB 400

A premium pressure washer that combines excellent performance with durable build quality for long-lasting value.

The STIHL RB 400 DIRT BOSS® pressure washer features a powerful 196 cc (6.5 hp) engine, delivering 2,700 psi of water pressure at 2.7 gallons per minute. It’s got the power you need for heavy-duty cleaning of sidewalks, driveways, decks and more. The RB 400 DIRT BOSS® is also built to last, including a brass manifold pump design, stainless steel valves and ceramic-coated pistons. There is also a c...Read More
Print Spec Sheets
RB 400 DIRT BOSS® Specifications
DISPLACEMENT 196 cc 12.0 cu. in.)
FUEL CAPACITY 3.6 L (3.8 qt.)
HOSE LENGTH 25'
WATER FLOW 620 L/h (2.7 gpm)
WATER PRESSURE 2,700 psi
CLEANING UNITS 7,290
WEIGHT 41 kg (90 lbs)
DIMENSIONS HANDLE DOWN 724 x 699 x 654 mm (28.5 x 27.5 x 25.75")
DIMENSIONS HANDLE UP 724 x 699 x 1003 mm (28.5 x 27.5 x 39.5")
Model Features
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    Easy Start Pump System
    The Easy Start Pump System features a pressure relief valve, allowing users to start the unit without any back pressure from the pump. It enables quick, easy starting with no hard cord pulls.
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    Stainless Steel High Pressure & Brass Detergent Nozzles
    This pressure washer includes stainless steel nozzles for use with high-pressure water and a brass nozzle for use with detergent. These premium nozzles are designed to resist corrosion and wear.
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    2-Piece Lance & Gun Assembly
    This pressure washer features an easy, convenient 2-piece lance and gun assembly. The lance design is also extended for better accuracy in tall applications.
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    Easy-Access Inlet & Outlet Water Connections
    Both inlet (water coming into the pump) and outlet (water going from the pump to the gun) connections are easy to access for faster setup
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    Automatic Fuel Shut-Off Valve
    This pressure washer features a combined on/off and fuel valve control. This allows the user to shut unit off and close fuel valve automatically for easy, no-mess transport.
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    Anti-Vibration System
    This pressure washer features a STIHL-engineered 4-point vibration isolation system. This reduces pump vibration during use for increased unit longevity.
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    View the RB 400 features.

Important Information
WARNING! Improper use of any power tool may cause serious or fatal injury. Read, understand and follow carefully the operating and safety instructions in your instruction manual before using such products.

STIHL products sold through U.S. STIHL Dealers are for distribution in the United States only.
Click to view the STIHL Limited Warranty Time Periods
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Are You Ready for a STIHL?

RB 400 DIRT BOSS® is rated 4.7 out of 5 by 31.
Rated 5 out of 5 by from Plenty of pressure with no purging. Effortless starting this far. Wand is perfect length. Only change I'd make is the gas fill location. Overall a 5. You pay a little more but the quality and reliability is worth it. I would say I was impressed, but owning a commercial back pack blower and saws I expected the same quality and was not surprised that this washer had all the same goods. The starting, the hook ups, the pump, and motor all were as expected. (Great) I have two other pressure washers one with a Briggs one with a Honda both are similar psi both have had issues from the carb on the Briggs to the Pump on the Honda, so I bit the bullet and spent a little more for Stihl and so far am very pleased.The ONLY complaint isn't really a complaint just a suggestion that would be the gas tank design. The gas cap is Top Dead Center of the tank. It requires a funnel and an extra hand or coordination to fill. Had they moved it or put an angled throat on it, it would make filling the unit much easier. 5 of 5 and very pleased overall.
Date published: 2018-08-07
Rated 5 out of 5 by from Power a lot of it Wow just used on my driveway had to stop because this beast has a lot of power. I just don’t understand why the product did not come with 0 degree nozzle end??? Recommend it it’s a beast.
Date published: 2018-08-03
Rated 5 out of 5 by from Starts every time Ok I have bought several power washers over the years. If you buy cheap you get cheap. I bought this one early spring and have used it on several projects. The thing I love best is it always STARTS. Did I mention that is starts every time?
Date published: 2018-07-16
Rated 5 out of 5 by from Easy start, easy mobility, lightweight hose Starts on the first pull and you don't have to overcome or relieve the water pressure. If the engine is running and water isn't used the unit releases water to cool the pump. The unit is easy to move. The hose is lightweight and flexible. The hose connections are screw on and easy to hook up and unhook.
Date published: 2018-07-09
Rated 5 out of 5 by from RB400 does everything I have used my RB400 for about three weeks. It has cleaned deck, sidewalk, gutters, soffit, vinyl siding, truck, gas grill. Everything was cleaned great. Only problem I had was that when I had the engine running on the grass for about ten minutes without moving the engine, I found dead grass about 2ft square the next day. I thought that the exhaust from the engine was too hot. I changed the exhaust vent direction to move it direction up higher rather than straight down onto the grass. Easy thing to do just move two screws. No this RB400 if perfect for me.
Date published: 2018-07-06
Rated 5 out of 5 by from Well worth the expense Don’t bother trying to go with a less expensive brand. The longevity and consistency is reliable and the power is exactly what you need for any project.
Date published: 2018-07-03
Rated 4 out of 5 by from Too early to tell Bought the RB400 because the dealer pointed out a design flaw with the RB200. The RB200 routinely burns the water hose when it comes in contact with the hot carburetor! They couldn't find replacement hoses since dealer stock was unavailable. I upgraded to this model for homeowner use. I didn't realize it had a Kohler Engine, should have done more research. Dealer prep and delivery is flawless with Stihl. The washer has been used one time now, starts out smoothly and did a fantastic job cleaning a concrete driveway with the 40 degree arch nozzle. It comes with a choice of high quality nozzles that clip in under the handle onto a panel for easy switching. I cannot vouch for long term reliability, however if it is like other Stihl products it will work flawlessly. I intend to use 2 to 3 times a year, so it will not be used for heavy jobs. The fittings are brass, quality fittings that will last forever.
Date published: 2018-06-21
Rated 5 out of 5 by from Very good product I like the EZ of how it started and being able to control the throttle as needed and a manual choke is the best. I am 100% satisfied.
Date published: 2018-06-14
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