To see product details, add this item to your cart. You can always remove it later.
Added to

Sorry, there was a problem.

There was an error retrieving your Wish Lists. Please try again.

Sorry, there was a problem.

List unavailable.
Other Sellers on Amazon
Added
Sold by: 105Inc
Sold by: 105Inc
(1268 ratings)
90% positive over last 12 months
Shipping rates and Return policy

AAA 90034 Horizontal Triplex Plunger Replacement Pressure Washer Pump Kit, 4400 PSI, 4.0 GPM, 1" Shaft, Includes Hardware and Siphon Tube, for Industrial Gas Powered Machines, Black

4.1 4.1 out of 5 stars 209 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Pressure Washer Pumps by SIMPSON

To see product details, add this item to your cart. You can always remove it later.
Available at a lower price from other sellers that may not offer free Prime shipping.

Purchase options and add-ons


About this item

  • Extend the life of your pressure washer: Save money by replacing your pump instead of buying a whole new power washer. This easy-to-install kit is great for power washers that can support 4400 PSI at 4.0 GPM to wash walls, sidewalks, vehicles, and more
  • Compatibility: SAE standard bolt pattern fits many gas pressure washers with horizontal engines. To ensure compatibility, be sure to match engine orientation, PSI, GPM, engine shaft diameter, and current pump inlet and outlet connection
  • Adjustable power: Pump includes PowerBoost Technology that delivers higher pressure at the nozzle for a more efficient cleaning experience; There is also a hand turn knob that lets you reduce power at your convenience for tasks that require lower pressure
  • Know when to change your oil: The sight glass and advanced oil seal technology eliminates the need for a dipstick. With visibility to the oil level and the oil itself, you can easily see when oil levels are low or if water has clouded the oil
  • Standard Connections: This replacement pump features a garden hose inlet and quick connect high pressure hose outlet; Use it with many pressure washer hoses, including Simpson Armor 41114, 41096, 41115 or Simpson Monster 41113, 41028, 41030, 41032, 41034

Customer ratings by feature

Easy to install
4.3 4.3
Value for money
2.8 2.8

Frequently bought together

$379.99
Get it as soon as Sunday, Mar 31
In Stock
Ships from and sold by Amazon.com.
+
$24.23
Get it as soon as Sunday, Mar 31
In Stock
Ships from and sold by Amazon.com.
Total price:
To see our price, add these items to your cart.
Details
Added to Cart
Choose items to buy together.

Compare with similar items

This Item
AAA 90034 Horizontal Triplex Plunger Replacement Pressure Washer Pump Kit, 4400 PSI, 4.0 GPM, 1" Shaft, Includes Hardware and Siphon Tube, for Industrial Gas Powered Machines, Black
SIMPSON AAA 90034 Horizontal Triplex Plunger Replacement Pressure Washer Pump Kit, 4400 PSI, 4.0 GPM, 1" Shaft, Includes Hardware and Siphon Tube, for Industrial Gas Powered Machines, Black
Recommendations
TOOLCY Pressure Washer Pump Max 4000 PSI 4.2 GPM, 1" Shaft Horizontal Gas Power Washer Pump Replacement, Direct Drive, Triplex Plunger Replacement Pump with Pressure Adjustment Unloader
dummy
TOOLCY Pressure Washer Pump 3800-4000 PSI Max, 4.4 GPM, 1 inch Shaft Horizontal Triplex Plunger Replacement Pump for Power Washer, Direct Drive, Compatible with Honda GX340 GX390 GX270, 5 Nozzle Tips
dummy
VEVOR Pressure Washer Pump, 4400 PSI, 4.0 GPM, 1" Shaft Horizontal Triplex Plunger, Replacement Power Washer Pumps Kit, Parts Washer Pump, Compatible with Simpson MorFlex Models 40224, 40225, 40226
dummy
OEM Technologies 90029 Replacement Pressure Washer Pump Kit, 3400 PSI, 2.5 GPM, 3/4" Shaft, Includes Hardware and Siphon Tube, for Residential and Industrial Gas Powered Machines
dummy
YAMATIC 3/4" Shaft Horizontal Pressure Washer Pump 3400 PSI @ 2.5 GPM Replacement Pump for Power Washer Compatible with Homelite, Troybilt, Simpson, Karcher Honda GC160 GC190 AR rmv 2.5g30 and More
Details
Added to Cart
Details
Added to Cart
Details
Added to Cart
Details
Added to Cart
Details
Added to Cart
Details
Added to Cart
Price$379.99-17% $199.99
List:$239.99
-8% $229.99
List:$249.98
-29% $159.89
List:$224.55
-24% $149.99
List:$196.99
$69.99
Delivery
Get it as soon as Sunday, Mar 31
Get it as soon as Monday, Apr 1
Get it as soon as Sunday, Mar 31
Get it as soon as Monday, Apr 1
Get it as soon as Sunday, Mar 31
Get it as soon as Sunday, Mar 31
Customer Ratings
Easy to install
4.3
4.3
4.3
4.5
4.7
4.8
Value for money
2.8
3.7
3.7
4.3
4.3
4.6
Longevity
3.2
3.2
4.2
3.9
4.2
Sold By
Amazon.com
TOOLCY
TOOLCY
Amazon.com
Amazon.com
YAMATIC Power Center
power source
Gas Powered
Engine Powered
Engine Powered
manual, gasoline
Gas Powered
engine
material
Brass
Aluminum, Brass
Aluminum
Brass
Brass, steel
Aluminum, Brass
style
Pressure Washer Pump
4000 PSI Max
3800-4000 PSI Pressure Washer Pump
1" Shaft Triplex
Horizontal
Axial
maximum flow rate
4 gallons per minute
4.2 gallons per minute
4.4 gallons per minute
4 gallons per minute
2.5 gallons per minute
2.5 gallons per minute
weight
16 pounds
20 pounds
7 pounds
5 pounds

Product guides and documents


From the manufacturer

90034 90038 90039 banner
90034 A+ hero

simpson logo

With over 60 years of industry-leading experience built into each of our products, it is easy to see why backyard heroes and job site champions everywhere prefer the SIMPSON Advantage.

  • 60 years of innovation and technology breakthroughs
  • Replacement parts to extend the life of your machines
  • Accessories to expand the uses
  • Solutions for every shopper, from DIY to large industry

AAA 90034 Horizontal Triplex Plunger Replacement Pump Kit for Gas Powered Pressure Washers

Designed to fit most makes and models of gas pressure washers with horizontal engines

Designed for performance, the AAA PROFESSIONAL triplex pump rated up to 4400 PSI @ 4.0 GPM is highly efficient. It minimizes engine load while delivering top performance. The 90034 contains dual oversized ball bearings for better wear, friction resistance and longer-lasting performance in the toughest cleaning environment. Comes equipped with the Easy-Start feature and is rated up to 4400 PSI @ 4.0 GPM.

  • 4400 PSI, 4.0 GPM, 1" Shaft
  • PowerBoost Technology delivers higher pressure at the nozzle
  • Fully adjustable unloader system with ergonomic control
  • Thermal relief protection to prevent the pump overheating

AAA Replacement Pump Kit Features

90034 connections

90034 mount

90034 sight glass

90036 Accessories

Easy Connections

The Garden Hose Inlet and QC high pressure outlet make for a simple setup to get your power washer up and running in no time

Standard Mounting Options

The SAE standard bolt pattern fits most gas-powered pressure washers and simplifies the installation to start working as quickly as possible

Check Oil Level

Sight glass and advanced oil seal technology eliminates the need for a dipstick

Pump Kit Comes Fully Plumbed

What's Included:

  • Pump
  • Mounting Hardware (nuts and bolts)
  • Siphon Hose with Filter
  • Shaft Key
  • Instructions

90034 unloader

90034 construction

specs

disclaimer

Adjustable Power

The hand turn knob lets you reduce power at your convenience for tasks that require lower pressure

Premium Construction

  • The crankcase is manufactured from fully anodized die-cast aluminum for protection against corrosion
  • Dual oversized radial ball bearings are installed for better wear and friction resistance
  • Precision polished stainless steel pistons deliver extended seal life

Specs and Dimensions

  • PSI: 4400
  • GPM: 4.0
  • Pump Type: AAA Triplex Pump
  • Pump Brand: AAA
  • Shaft Size: 1 in.

Shop Amazon for Genuine Simpson Products

Always make sure the product says these two things to get the highest quality Simpson products on Amazon:

  • Ships from Amazon.com
  • Sold by Amazon.com

90034 comp chart 90036 comp chart 90037 comp chart 90038 comp chart 90039 comp chart
Learn More Learn More Learn More Learn More Learn More
Customer Reviews
4.1 out of 5 stars
209
4.4 out of 5 stars
193
4.4 out of 5 stars
912
4.4 out of 5 stars
912
4.4 out of 5 stars
912
PSI 4400 3200 3700 3800 4000
GPM 4.0 2.8 2.5 3.5 3.5
Shaft 1" 3/4" 3/4" 1" 1"
Orientation Horizontal Horizontal Horizontal Horizontal Horizontal
Hardware included
Connection QC M22 M22 QC QC
Sight Glass to Check Oil Level
Easy Start
Power Boost

From the brand

Product information

Warranty & Support

Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

Feedback

AAA

AAA 90034 Horizontal Triplex Plunger Replacement Pressure Washer Pump Kit, 4400 PSI, 4.0 GPM, 1" Shaft, Includes Hardware and Siphon Tube, for Industrial Gas Powered Machines, Black


Found a lower price? Let us know. Although we can't match every price reported, we'll use your feedback to ensure that our prices remain competitive.

Where did you see a lower price?

/
/
/
/
Please sign in to provide feedback.

Looking for specific info?

Product Description

Engineered to surpass expectations, the 90034 AAA Professional Triplex Pump is highly efficient and minimizes engine load while delivering top performance. This easy-to-install pump replacement kit is for gas pressure washers* with a horizontal engine and a 1" diameter shaft, such as the Honda GX390. This pump can produce up to 4400 PSI at 4.0 GPM. The 90034 is designed with dual oversized ball bearings to reduce friction and allow for long lasting performance in the toughest cleaning environments. The 90034 features a stainless steel integrated unloader featuring our easy-start system. (*Check your pressure washer's inlet and outlet orientation to ensure compatibility)

Customer reviews

4.1 out of 5 stars
4.1 out of 5
209 global ratings

Customers say

Customers like the ease of installation of the water pump. For example, they mention it bolts right on and works perfectly. That said, some complain about the oil resistance and durability. They say it leaks oil and comes completely apart. Opinions are mixed on quality.

AI-generated from the text of customer reviews

9 customers mention9 positive0 negative

Customers find the installation of the water pump to be easy. They mention that it bolts right on, and has worked perfectly since installed.

"It was very easy to change out and has worked perfectly since installed" Read more

"...It was super easy to install but didn't last past 3 uses. At that point it started to get water pushed back into the crank area of the pump...." Read more

"...It replaced an AAA model EW4040. It easily bolted right on and I ran it for 2 hours with no problem. Hopefully it’ll last a long time." Read more

"Easy as heck to install, only 4 bolts! There wasn’t even a set screw on the shaft...." Read more

15 customers mention8 positive7 negative

Customers are mixed about the quality of the water pump. Some mention that it works great, while others say that it has factory problems and does not work. The valve is made of cheap low grade brass and the spring is even lower grade steel.

"It was very easy to change out and has worked perfectly since installed" Read more

"...I contacted Amazon and the pump was not returnable which is a big downfall and I’m working with a repair company getting it repaired under warranty..." Read more

"Been using commercially for 3 months now. No issues...." Read more

"...All of my pumps get bimonthly maintenance. The valve is a cheap low grade brass the spring is even a lower grade steel...." Read more

11 customers mention0 positive11 negative

Customers are dissatisfied with the oil resistance of the water pump. They mention that the seal is leaking water in the oil, and water leaks out of the pump upon installation. Some customers also report that the pump has factory problems and mismatched parts. The pump starts gushing water out of its unloader and the oil gets milky within the first 10 minutes.

"...At that point it started to get water pushed back into the crank area of the pump...." Read more

"...I thought the pump worked excellent except for a water drip coming out of the pump and then I noticed the oil got milky within the first 10 minutes..." Read more

"...installed it , lubed it and ran it at 3900 psi the thermal relief valve started leaking constantly..." Read more

"...I've had it for three weeks and the seal is leaking water in the oil. Amazon may said you can return it BUT that is a lie...." Read more

5 customers mention0 positive5 negative

Customers are dissatisfied with the durability of the water pump. They mention that it fails after three uses, has no warranty, and comes completely apart.

"...It was super easy to install but didn't last past 3 uses. At that point it started to get water pushed back into the crank area of the pump...." Read more

"DO NOT BUY this AAA Pump because it will fail. I've had it for three weeks and the seal is leaking water in the oil...." Read more

"...I’ve had one of the one year old pumps come completely apart, throwing parts and oil in all directions...." Read more

"Pump came quick but did not work after being installed very disappointed" Read more

Item not as specified
2 Stars
Item not as specified
It is a new product but not as pictured as the 90034 pump for the Simpson pressure washer.it should work but my issue is on the ID it`s a Craftsman part mfg. Sept 2009.I do not know the specs for this item and 10 year old o-rings can not be robust enough for 5 years of service.It has been returned .The picture is the same as the part simpson use on their 4200 psi 4.0 gpm unit. but what came in the box is different Thankyou Amazon for prompt service, you exceeded my needs as a customerand will still have my business .Ordered another Pump and it matches the updated picture ,it is a AAA labeled product.my only problem I have is that the model and serial number is not present on the producthow is it warrantedI got refund on the unit. installed it , lubed it and ran it at 3900 psi the thermal relief valve started leaking constantlynot from overheating just from normal water pressure from the supply line does not matter if the machine runs or not.Mfg still says its warranted and take to service center Ugg!6/6/2021 Update. I called water cannon and talked to their rep. I got a 4000psi 3.5 gpm cat pump and added an accessory to it. the service was great I got a new product and I am very satisfied. It has been over a year and no problems.My issue is if you could get a replacement AAA pump of the same quality as the one that was originally installed: life would be great. I used my Simpson PS4033 over 6 years commercially on parking lots, apartment complexes, many many residential buildings with no problems. the big issue was getting FNA to sell me a quality product.I know they do because there are good reviews on this site.
Thank you for your feedback
Sorry, there was an error
Sorry we couldn't load the review

Top reviews from the United States

Reviewed in the United States on December 7, 2023
Reviewed in the United States on October 27, 2023
Reviewed in the United States on April 15, 2023
3 people found this helpful
Report
Reviewed in the United States on July 22, 2022
Reviewed in the United States on December 13, 2018
One person found this helpful
Report
Reviewed in the United States on October 21, 2021
Reviewed in the United States on April 19, 2019
4 people found this helpful
Report
Reviewed in the United States on February 16, 2022
5 people found this helpful
Report