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Karcher 4000 PSI (Gas-Cold Water) Pressure Washer w/ Honda GX Engine

Karcher Pressure Washers and Accessories
Model: G4000OH
(Based on expert analysis, manufacturer ratings and customer reviews)

3.8 out of 53.8 out of 53.8 out of 53.8 out of 53.8 out of 5
11 Reviews
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  • Features
  • Specs
  • 3
  • 11
  • Articles
  • Shipping
  • Accessories
Water Pressure
Water Flow
Cleaning Speed
Cleaning Units
Honda GX
High Performance Pressure Washer
Perfect for estates, farms, stables, small business, etc.

Honda GX390 Engine
Powerful commercial-grade 390cc engine blasts through tough jobs

Revolutionary Remote Pressure Control
Adjust the pressure right on the wand
No need to stop & walk back to the unit to change the pressure

Karcher Industrial Grade Axial Pump
German engineered direct drive with durable brass head

Stainless Steel Spray Wand
Pro style lets you work longer with less fatigue
Patented Karcher quick connect nozzles: 0, 15, 25, 40 & soap
50 feet of high quality, non-marking rubber hose

Low Profile Frame
Chip resistant crinkle finish, compact and easy to transport
12" pneumatic tires easily take on tough terrain

Actual Color Of Unit May Be Different Than Pictured
Engine cover may be red or black

Engine Brand
Honda GX
390 CC
Consumer Engine Warranty
2 Years
Pump Brand
Pump Type
Axial Cam
Adjustable Pressure
Chemical Injection
Siphon Tube
Water Temperature
Water Pressure
4000 PSI
Water Flow
3.6 GPM
Frame Type
2-Wheel Cart
Hose Storage
Hose Length
50 Feet
Hose Material
Hose Diameter
3/8 Inch
Hose Connections
Spray Gun
Spray Gun Connection
Spray Gun Grade
Spray Gun Wand
Single Wand
Spray Tips
Quick Connect Tips (5)
Turbo Nozzle
Sold Separately
Made in USA
122 Pounds
Product Length
36.5 Inches
Product Width
23.5 Inches
Product Height
30.5 Inches
Consumer Warranty
1 Year
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*Ask Brian about the Karcher G4000OH. Sorry, no repair questions:




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  3 Questions
Q: Hi Bill,
Can another brand name pump like General or AR or Cat pump replace the Karcher 4000 axial cam pump?

If yes, is it just to take out and change or do you have to modify?

Thanks in Advance,

by Melvin Walters from Florida on September 29, 2011

A: Unfortunately you could not purchase this machine with another brand of pump, meaning the machine could not be customized from the factory. However, you could definitely purchase a General Pump, CAT PUMP, or AR brand pump and install it on this machine with no modifications needed. You would just have to make sure that the replacement pump you purchased accepted a 1" diameter shaft and was designed for a horizontal installation.
by Brian, Product Expert
Q: How does the Karcher compare to something with a general or cat pump? what's the difference between a axial & triplex pump?

How much does a new pump for it cost? or to rebuild the one thats on it?

by Scott from Indiana on May 19, 2011

A: When it comes to a unit with a General or Cat pump, the difference in quality is going to be much different. It really comes down to the type of pump. The General and Cat pumps are going to be a tri-plex plunger pump made of ceramic. Going to be much more durable as well as a better quality. Axial Cam pumps are made from aluminum and not going to give you the durability you are looking for the long term.

Replacement pumps are typically going to be anywhere from $250-$500. The plus side to a tri-plex pump, you can actually rebuild these, where an axial cam cannot be rebuilt.


Pressure Washers Direct
by Brian, Product Expert
Q: Bill I am going to buy a pressure washer, and the Karcher( 4000) I was told was the best from some friends. I went to a couple of shops and the owners didn't recomend buying the Karcher. What do you think, I just don't want to buy something that won't last.
by Bob Bradford from Oregon on March 27, 2011

A: Karcher actually makes really good quality pressure washers, especially their gas models. Karcher uses their own branded German engineered pumps on all of their gas pressure washers. With this model having a Honda GX engine on it, you are absolutely getting a quality pressure washer. You might have heard some negative comments on Karcher products due to an issue Karcher was having a couple years ago with their after sales support. Since then, Karcher has drastically improved their warranty procedures.

I would have no problem at all recommending Karcher's gas models or their higher end electric models. We have had good luck with selling their products.
by Brian, Product Expert
Karcher G4000OH Reviews & Ratings
11 Reviews  Sort by 
Brian, the Pressure Washer Expert
Pressure Washer Expert

Product Expert
Total Reviews
122 Reviews
Total Helpful Votes
6347 Helpful Votes
Pressure Washers Direct Recommended

You really can't go wrong with a Honda GX engine and a German engineered, Karcher brand pump. They are unique in that they can pull water from a tank and/or any standing source of water. Karcher produces a very heavy duty axial cam pump that if stored properly, will last for many years.

What secured our "Best" recommendation in this category was not only the great quality of the components but also a new development- a remote pressure control located on the spray wand. This lets... more
Brian Recommends This Model
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Mike L.
Dulac, LA
Purchased from Pressure Washers Direct
Purchased 5/10/09
Total Reviews
2 Reviews
Total Helpful Votes
17 Helpful Votes
1 out of 51 out of 51 out of 51 out of 51 out of 5
I'm really disappointed with this washer. The pump needs repairs after only using it seven times. The hose already has to be replaced because for some reason a blade of grass must have punched a hole in it.

My old pressure washer was 13 years old and I never had to replace the hose or the pump. The service center is 60 miles from my home and Karcher has no customer service.

They only tell you to bring it the 60 miles to have it checked. I'll never buy another Karcher.
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Mississauga, OH
2 out of 52 out of 52 out of 52 out of 52 out of 5
Took A Few Months To Find Out
I bought this machine from Karcher Canada because of their custumer service and the warranty of seven years on the pump. When I took it home the machine was a beast, it works amazing with lots of power. I clean concrete on weekly basis and this machine delivers the power needed. It was after two months when I noticed a decrease on the power. I thought it was due to the water pressure on the resident. I took the machine three times to Karcher and they told me the machine is fine but at my house... more
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Eric B.
Simi Valley, CA
Purchased from Pressure Washers Direct
Purchased 10/21/12
1 out of 51 out of 51 out of 51 out of 51 out of 5
Gas Leaking Everywhere
So I ordered this unit and the fuel pours out of the bottom of the carb; and NO it's not just a bolt that need to be tightened. There's at least 3 places it's draining from. The local dealer is 80 miles any so guess who's going to get stuck with the repair bill for a pressure washer that hasn't even run more that 5 min! Ya ME.... But if they do take care of the bill I'll report back and let everyone know.

At this point I regret my $ 1,150.00 purchase..... Purchase local!!!!!!!!!!!!

Oh... more
Brian, the Pressure Washer Expert
Product Expert
We apologize for the inconvenience! If you'd like to see if Karcher has added any new service locations closer to you, you could give them a call, toll free, at (800) 537-4129.

Your unit is covered by Factory Warranties. Any Honda small engine location can handle engine warranty work at no cost to you; and Karcher will take care of the rest under their warranty, again at no cost to you as long as the problem is related to a defect in materials or workmanship.

Please let us know if you do wind up having to travel a long distance for service- we'll be happy to help you directly.
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Kevin Pontius
Austintown, OH
Total Reviews
2 Reviews
4 out of 54 out of 54 out of 54 out of 54 out of 5
So Far So Good !!!
I recently purchased this machine. I've done several decks, garage floors, and some vinyl siding cleaning.

I've used the cleaner through the pump which worked well. The machine has performed well.

The only disappointment was when I went to fill the tank with gas, I noticed fuel running from the carb. After inspection I noticed the fuel line from the tank was not connected to the carb, spewing gas all over my blacktop driveway...

Easy set up and works well........
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John Blaha
Bel Air, MD
Purchased from Pressure Washers Direct
Purchased 6/12/09
5 out of 55 out of 55 out of 55 out of 55 out of 5
Karcher G4000oh Easy To Assemble
I received my pressure washer within 5 days of ordering. I was very happy with the ordering and delivery process.

Another reviewer says it took him an hour to assemble. Honestly it took me about 15-20 minutes.

The pressure washer works great, and the adjustment on the handle makes it that much easier.

I am very satisfied.

If I needed to, I would buy it again and from Pressure Washers!!!
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T Cash
Cornersville, TN
Purchased from Pressure Washers Direct
Purchased 5/14/09
Total Reviews
2 Reviews
5 out of 55 out of 55 out of 55 out of 55 out of 5
Karcher 4000 Psi Is Worth The Extra Money
In May of 2009 just bought the Karcher 4000 psi, 13hp power washer. The unit was delivered to my door in a professional manner. It took me about 1 hour to assemble the washer and insert oil, make sure all was set up for working order.

The unit started on about the 3rd pull. Overall, I am pleased with this unit- I wanted to be sure that I didn't purchase something too small to complete the tasks at hand.

This unit weighs about 120lbs when assembled so it's something that I can pick... more
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Robert Geissler
Newfield, NJ
Total Reviews
4 Reviews
5 out of 55 out of 55 out of 55 out of 55 out of 5
Great Machine
Great machines, I used the Ladder Saver at the end of the season and cut my time in half compared to the old 5.5 hp machine I had before.
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John Brodacki
Richmond, MI
Purchased from Pressure Washers Direct
Purchased 5/15/10
5 out of 55 out of 55 out of 55 out of 55 out of 5
Lives Up To It's Advertising
I Like It Because It Lives Up to What Is Advertised to Be.

the Decals Were Only Half Stuck On, But That Is Quite Trivial.

It Starts Real Good and the Pressure Is Great.
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Clyde Harbin
Southaven, MS
Purchased from Pressure Washers Direct
Purchased 4/12/10
5 out of 55 out of 55 out of 55 out of 55 out of 5
Really Nice Equipment
I really liked the fast shipping. Paypal is the way to go for this route. I have invested about $3800 in this venture.

The accessory available to me from Pressure Washers Direct is very nice and really high standards. I give all the equipment an A1 rating.

I will be buying another one shortly through them for my detailing business.

Thanks again for the equipment.
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Purchased from Pressure Washers Direct
Purchased 5/20/12
4 out of 54 out of 54 out of 54 out of 54 out of 5
Great Results With Problems
Machine works great, like everything about it except: trigger function went south after a couple hours of use, no help from PWD, paid to have it fixed, broke again, now has to run full on, no shut off except at machine.

Also, lousy design the way feet are located, either hits your heels or snags the ground whenever it's moved.
Cyrus Recommends This Karcher Product
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We currently CANNOT ship this product to Alaska, Hawaii or any destination outside of the United States
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  • $50.00 Service Charge
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