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Generac 5997 4,000 PSI 4.0 GPM 420cc OHV Gas Powered Commercial Pressure Washer (Discontinued by Manufacturer)

3.5 out of 5 stars 29 customer reviews

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  • Commercial-grade power washer with 4,000 PSI and 4.0 gallon per minute (GPM)
  • Powerful Generac 420cc OHV engine with low oil shutdown and integrated unloader valve for easy engine startup
  • Professional-grade spray gun with an adjustable side handle
  • Professional-grade triplex pumps with ceramic-coated pistons are designed for long life
  • Non-CARB Compliant/Not For Sale In California
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Generac 5997 4,000 PSI 4.0 GPM 420cc OHV Gas Powered Commercial Pressure Washer (Discontinued by Manufacturer)
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Add to Cart Add to Cart Add to Cart Add to Cart Add to Cart
Customer Rating 3 out of 5 stars (29) 3 out of 5 stars (476) 4 out of 5 stars (1196) 4 out of 5 stars (93) 3 out of 5 stars (12) 4 out of 5 stars (376)
Price Unavailable $1,136.39 $359.00 $979.99 $909.99 $399.00
Shipping FREE Shipping FREE Shipping FREE Shipping FREE Shipping FREE Shipping
Sold By SWEET DEAL! Amazon.com CPO Outlets Amazon.com CPO Outlets
Item Dimensions 28 x 28 x 32 in 24 x 37 x 27 in 21 x 34.75 x 23.25 in 28.3 x 34.5 x 42.5 in 26.5 x 28 x 24 in 18.9 x 24.2 x 35.5 in
Item Weight 165 lbs 141 lbs 65 lbs 146.5 lbs 142 lbs 57 lbs
Power Source gas-powered Gasoline Gasoline gas-powered gas-powered gas powered

Product description

Product Description

Power wash your deck, prep for painting, remove tough concrete stains and more with this powerful pressure washer from Generac. Long been known for their quality engines, this model is no exception, equipped with a powerful 420cc Generac OHV engine. Also included are five Quick-Click nozzle tips (0-degree Blast, 15-degree Strip, 25-degree Clean, 40-degree Wash, Soap), and a 50 foot hose. Generac's power washers are carefully engineered for longevity and ease of use, with well thought-out features not found on competitive models. Easy to maneuver, the welded frame is designed for durability, with a built-in step for easy starting and an integrated gun holster. The easily accessible high-performance axial cam pump provides maximum heat dissipation for extended life and the easy to pull trigger reduces fatigue. The pump is located well above the ground, eliminating the need to kneel down to make hose connections. Backed with a 3 year limited warranty. Founded in 1959, Generac has earned a reputation as the company home and business owners turn to when the power goes out. The first to engineer affordable home standby generators, along with the first engine developed specifically for the rigors of generator use, Generac now sells more home standby generators than all of our competitors combined. We have brought this same level of commitment and quality to our pressure washer products. Our customer research has led us to engineer our pressure washers from the ground up, to meet your specific demands. Generac manufactures the widest range of power products in the marketplace including portable, RV, residential, commercial and industrial generators. Generac also operates three large factories which employs thousands of workers in the American Midwest.

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Long known for its portable generator design, Generac introduces its lineup of commercial-grade pressure washers, enabling you to power wash your deck, prep for painting, remove tough concrete stains, and more at home and on the job site. The Generac 5997 provides 4,000 PSI of power and 4.0 gallons per minute (GPM) for a cleaning power rating of 16000.

Generac 5997
The Generac 5997 power washer.

It's powered by a Generac overhead valve (OHV) horizontal-shaft engine, the largest available for its respective pressure rating. Generac OHV engines come standard with low-oil shutdown to protect and prolong the life of the engine. Both the engine and pump are perfectly balanced over the axle and wheels for almost effortless maneuverability, regardless of terrain. Generac pro models also offer durable, welded roll-cage style frames that protect both the engine and pump from damage.

It comes with an ergonomically designed professional-grade spray gun, which features a unique cushion grip that reduces fatigue by minimizing vibration. The innovative easy-to-pull spray trigger can be held with a minimum of effort, and the Quick-Click nozzle tips are easy to replace. Additionally, this pressure washer's gun comes with an adjustable side handle for additional comfort and control when cleaning up high, down low, or anywhere in between.

This power washer is backed by a three-year limited warranty.

Note for California residents: This model is not CARB-compliant. Units sold to California must be CARB-compliant.

What Is PSI and GPM?

Short for "pounds per square inch," PSI is a measure of the water pressure coming out of the power washer. A typical garden hose dispenses water at about 30-40 PSI, and a coin-operated car wash provides about 700 PSI. A power washer, by contrast, typically dispenses water at several thousand PSI. Another important factor in power washers is GPM, which stands for "gallons per minute" and describes how much water is flowing through the pressure washer.

Together, they provide your power washer's cleaning power. Multiply PSI (which gives you the power to lift dirt and grime) by GPM (which provides the necessary quantity of water to wash it away) to get the cleaning power rating. The higher the number, the greater the cleaning power.

Here are some application examples with how much cleaning power (PSI and GPM) you'll need to get the job done.

Sizing comparison


Compare the Generac Power Washers
Model # 5993 5995 5997 6020 6022
Compliance 49 State 49 State 49 State 49 State 49 State
Type Commercial Commercial Commercial Residential Residential
PSI 3,000 3,300 4,000 2,500 2,700
GPM 2.8 3.2 4.0 2.3 2.3
Cleaning power rating 8400 10560 16000 5750 6210
Engine 212cc 302cc 420cc 196cc 196cc
Spray gun Professional grade Professional grade Professional grade Ergonomic Ergonomic
Hose 3/8-inch x 35-foot steel reinforced, non-marring rubber 3/8-inch x 35-foot steel reinforced, non-marring rubber 3/8-inch x 50-foot steel reinforced, non-marring rubber 1/4-inch x 25-foot PVC/plastic 1/4-inch x 25-foot PVC/plastic
Quick-Click Nozzle Tips (5) 0°, 15°, 25°, 40°, soap (5) 0°, 15°, 25°, 40°, soap (5) 0°, 15°, 25°, 40°, soap (3) 0°, 25°, soap (4) 0°, 25°, 40°, soap
Wheels 10-inch Never Flat 10-inch Never Flat 12-inch pneumatic Plastic 10-inch solid
Dimensions (LxWxH, inches) 25 x 26 x 30 28 x 28 x 33 28 x 28 x 33 17 x 27 x 21 17 x 27 x 21
Weight 113 pounds 145 pounds 165 pounds 82 pounds 83 pounds


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