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Generac 3100 PSI (Gas - Cold Water) Pressure Washer (2015 model)

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Generac Pressure Washers and Accessories
Model: 6598
(Based on expert analysis, manufacturer ratings and customer reviews)
4.6 out of 54.6 out of 54.6 out of 54.6 out of 54.6 out of 5
241 Reviews
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  • Features
  • Specs
  • 11
    Q&A 
  • 241
    Reviews
  • Articles
  • Accessories
Grade
Style
Water Pressure
3100
PSI
Water Flow
2.7
GPM
Cleaning Speed
8370
Cleaning Units
Engine
Generac
Powerful Generac 5.5 HP Horizontal Shaft OHV Engine
Easily handles most tasks around the house

High Performance AR Axial Cam Pump
Brass head is more durable than all-aluminum pumps
Easily accessible- no more kneeling to connect hoses

Handy, Manuverable Cart With Spray Gun Holster
Engine & pump are perfectly balanced & easy to move
Large Never-Flat wheels take on varied terrain

Ergonomic Generac Spray Gun With 20" Lance
Soft grip & easy-pull inverted fulcrum trigger reduces fatigue

5 Quick-Click™ Nozzle Tips & 30' M22 Hose
0°, 15°, 25°, 40°, and soap applicator

Two 3/4 Gallon On-Board Detergent Tanks
Keep 2 detergents handy- wash & wax, cleaner & grease cutter, etc

Stabilizing Foot Rest
Holds the unit steady for smoother pull-starting

2 Year Limited Warranty
Protects your investment

Not For Sale In California
Doesn't meet strict CARB emissions standards


Engine
Engine Brand
Generac
Starter
Recoil
HP
5.5 HP
CC
212 CC
Fuel Tank Size
3.2 quarts
Pump
Pump Brand
AR
Pump Type
Axial Cam
Adjustable Pressure
No
Chemical Injection
Dual Detergent Tank
Detergent Tank Capacity
.75 gal x2
Water Temperature
Cold
Water Pressure
3100 PSI
Water Flow
2.7 GPM
Housing
Frame Type
2-Wheel Cart
Wheels
NeverFlat
Hose
Hose Storage
Hook
Hose Length
30 Feet
Hose Material
PVC/Plastic
Hose Diameter
1/4 Inch
Hose Connections
M22
Spray Gun
Spray Gun Connection
M22
Spray Gun Grade
Residential
Spray Gun Wand
Single Wand
Spray Tips
Quick Connect Tips (5)
Turbo Nozzle
Sold Separately
Overview
Weight
67.5 Pounds
Product Length
23.3 Inches
Product Width
16 Inches
Product Height
40.3 Inches
Consumer Warranty
2 Years
UPC
696471065985
Model
6598
  11 Questions
Q: Is there a comparable model that you would recommend over this model?
by Keith Shannon from Maryland on May 26, 2015

A: The unit that is equal in quality, is the Karcher unit model G3050OHC. Karcher makes the pump on the unit and it is one of the best consumer grade units in the industry today. I have attached a link to view that item.

Karcher Unit
by Brian, Product Expert

Q: Is there an extension hose available for this model? What hose would you suggest if I go with a
longer hose instead of the extension hose?

by Steve Lohman from Missouri on April 24, 2015

A: If you need to go with a longer high pressure hose, I would recommend jumping up to a 5/16" diameter hose and using it as a replacement. To extend the length, you would want a stronger more durable hose like the 5/16" hoses. I have attached a link for you to view a 50FT high pressure hose I would recommend for this unit.

50FT High Pressure Hose
by Brian, Product Expert

Q: What is a flywheel brake and what is the purpose of it? does the generac have this brake and the Honda ? I had a Honda washer with a brake on it and I had a lot of different problems with it so im very cautions of buying another
by John T from Florida on September 13, 2014

A: No, this unit does not have a flywheel brake on it. The purpose of that is to control the engine speed. This unit is a great choice for homeowner use. I highly recommend this unit. The pump on the unit is made from AR, and is one of the best axial cam pumps in the industry today.
by Brian, Product Expert

Q: I have a 3100psi Generac model 60242 I purchased from PED. Works great. I have noticed lately that when I tilt the unit back in order to reposition it, it will suddenly quit. Is this the "Oil Alert System" sensing a drop in oil level and shutting down the engine? The unit restarts after a couple of pulls.
by Dave from North Carolina on June 05, 2014

A: It could be the Oil Alert sensor, or an adjustment needed in the carburetor... The good news is this unit comes with a 2 year Factory Warranty from the folks at Generac.

You can use their Service Center Locator to find your local Authorized Repair facilities, or give them a call at (888) 436-3722 x5381.

Please be sure to have the serial number of your pressure washer handy if you call Generac; they usually ask for it. You will need a copy of your invoice for any warranty work- just click on My Account in the upper right corner of our website and follow the prompts to print one out.

If there are several repair locations in your area you may want to call around to see which one has the shortest turn-around time so you get your pressure washer back as quickly as possible.
by Brian, Product Expert

Q: Hi...I see the site sells extended warranties. Who covers these, and what's covered. Also, is it worth it to go beyond the two year Generac offers.
by Brian Warehime from New York on May 29, 2014

A: The Extended warranty is covered by WarrenTech. They will start the day after the manufacture warranty and cover all non wearable items. Things that would not be covered would be items like the hose, gun, wand. They would have you take it to a local service center. I feel the Generac Warranty is great. However, if you would like extra time after that it is available for purchase.
by Brian, Product Expert

Q: I am looking for recommendation on accessories needed for the Generac 6598 to easily clean siding and gutters on a large 2 story house.
Thanks.

by Jared from Florida on May 08, 2014

A: I definitely recommend a telescoping wand and gutter cleaner attachment for your application. If you would like to spray detergent through the telescoping wand you will need to go with an aluminum one. I have included link to the telescoping wand, gutter cleaner, adapter needed to attach to your high pressure hose, and the detergent I recommend.

Telescoping Wand

Gutter Cleaner attachment

Adapter

Detergent
by Brian, Product Expert

Q: I'm buying a generac gas model# 6598 from you guys and am looking at MTM hydrojet turbonozzle to go with it.What size orifice should I get? We have a two story home (30' to gable ends) will MTM Hydro long-range detergent foamer work?
by Bruce E Lawrence from Maine on April 17, 2014

A: You should get a 3.0 Orifice Turbo Nozzle. Turbo Nozzles are meant to increase cleaning speed and efficiency, not for long distances. I have attached a link for you.

3.0 Orifice Turbo Nozzle

For your two story home and gables I would go with model 100145. This product allows you to reach up to 3 stories high. I have included a link to this as well.

Model 100145

Both of these product will quick connect on to the end of your lance where the colored spray tips usually go.
by Brian, Product Expert

Q: Will the Generac 6598 connect to a foam cannon like the MTM Hydro without needing any additional hardware?
by Doug from Rhode Island on April 15, 2014

A: Yes, you can purchase the MTM foamer model 14.0263. This has a fitting on it so that it quick connects into where your colored spray tips usually go, so no additional hardware is needed. I love this foamer!

MTM Foamer
by Brian, Product Expert

Q: What is the pump made out of?
by Zach from Minnesota on April 14, 2014

A: This unit has an AR axial cam pump with a brass head on it. It is a step above the rest in it's category. The brass head dissipates heat more effectively, therefore increasing the life of the pump.
by Brian, Product Expert

Q: Is there a telescoping spray wand available for the
Generac Model 6598?

by Carmen Fontana from Delaware on April 13, 2014

A: Yes, if you would like to be able to dispense detergent I recommend the 24' Aluminum Telescoping Wand. I have also included the adapter you will need to connect this product to your high pressure hose.


24' Aluminum Telescoping Wand

Adapter
by Brian, Product Expert

Q: If you go to Lowes, they still carry the model 6024. You show that model as being disconntinued. The 6598 seems to match up with the 6024, spec for spec. Is there any difference? Why wouldn't Lowes carry the 6598?
by Mark from Connecticut on March 19, 2014

A: The 6024 is the old model number. The new model number is the 6598. It has all the same components as the 6024, just different colors to make it more appealing.
by Brian, Product Expert

Generac 6598 Reviews & Ratings
Overall Rating
Features
5/5
Quality
4/5
Performance
5/5
Value
5/5
Overall
4.6 out of 54.6 out of 54.6 out of 54.6 out of 54.6 out of 5
Pros
Easy To Use (62)
I'd Buy It Again (40)
Price (37)
Easy To Store (24)
Exceeded Expectations (23)
Cons
Low Quality (8)
None (5)
Bad Instructions (5)
Durability (4)
Unreliable (4)
92% of respondents would recommend this product to a friend
241 Reviews  Sort by 
 
Ann V.
Helen, GA
Purchased from Pressure Washers Direct
Purchased 3/28/16
REVIEWED
JUL.
02
2016
4 out of 54 out of 54 out of 54 out of 54 out of 5
New Pw Owner
Have only used PW a few times so far but will use it more throughout the year.

Two major complaints.
One, the recoil cord used to start engine is very difficult to use. As a female user, I am unable to start it myself. Cord needs to be shorter to activate engine and start with less effort.

Two, the cord connecting the power wand to the unit leaves permanent black marks on any surface it contacts while using the washer. In future will place waterproof tarp under cord when using... more
Ann Recommends This Generac Product
Brian, the Pressure Washer Expert
Product Expert
Ann,
A good tip for starting direct-drive pressure washers like this one is kind of hidden on Page 13 of the Owner's Manual. It tells you to squeeze the spray gun trigger and let water run through the unit for a minute or two BEFORE you try to pull-start the engine.

This pushes all the air out of the pump (preventing "vapor lock") and allows the engine to turn over easier. You should do this every time before you yank on the pull starter. If the air is jammed in the pump it won't allow the engine to turn over because they are directly connected.

We appreciate your business, and I hope I was able to help.
more
Was this review helpful?
00
Rob
Bonita Springs, FL
Purchased from Pressure Washers Direct
Purchased 3/25/14
Total Helpful Votes
91 Helpful Votes
REVIEWED
APR.
05
2014
5 out of 55 out of 55 out of 55 out of 55 out of 5
Good Purchase
I purchased this model (6598) instead of the Generac One Wash since this design has been around longer and has a good track record. I have been very happy. Here are a few highlights from my experience thus far:

- Assembles out of the box in 10-15 minutes... very simple.
- Some plastic used in cosmetic areas, but high quality construction where it matters.
- Unit is balanced making it easy to tote around the house.
- Has a generous amount power and water output. very happy!!
- Engine... more
Pros: Easy To Use, Price, Exceeded Expectations
Rob Recommends This Generac Product
Was this review helpful?
912
Pat
Purchased from Pressure Washers Direct
Purchased 5/22/14
Total Helpful Votes
41 Helpful Votes
REVIEWED
JUN.
03
2014
1 out of 51 out of 51 out of 51 out of 51 out of 5
Hard To Start & Running Rough
Fast delivery & easy set-up. The unit was hard to start and ran very rough. Can't be returned since it has had fuel in it. Authorized warranty repair shop should be able to get to it in a couple of weeks. And now the unit is on sale.
Cons: Low Quality
Pat Does Not Recommend This Product
Brian, the Pressure Washer Expert
Product Expert
Pat,
I am sorry to hear your pressure washer isn't running well; I understand how disappointing that can be.

I see from your file that there are several Generac Authorized repair locations in your area- I hope you called around to find the one with the shortest turn-around time? During the summer months I realize they get busy.

It is Federal Law that prevents shipping an engine that has had gas in it, since it's a fire/explosion hazard. That's why we only sell products with national service networks.

For folks reading this review, there are a couple tips for new engines. First is to use fresh gas- the stuff you've had sitting around for the lawn mower may have lost a lot of its volatile compounds and won't burn well.

Second is to hook up the water to the unit, then pull the spray gun trigger and let the water run for a minute without starting the engine. This drives out all the air from the pump, preventing vapor lock. Since the pump and engine are connected directly, vapor lock can make it very difficult to get the engine to turn over.

We post the best prices we can every day. Occasionally manufacturers will run specials where they provide bonus items or a special price for sales that happen in a specific time period. Unfortunately they won't provide credits for sales that happen outside their time period. We appreciate your business, and apologize for any inconvenience.
more
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4110
John C.
Morganton, NC
Purchased from Pressure Washers Direct
Purchased 4/4/15
Total Helpful Votes
32 Helpful Votes
REVIEWED
APR.
09
2015
5 out of 55 out of 55 out of 55 out of 55 out of 5
Prior Reviews Predict Your Experience
Very fast shipping. My Generac 6598 came in 4 days. I ordered a Surface Cleaner the same day and I have no idea what the status is, but I am waiting on it. I ordered the ultimate quick connect today. I highly recommend getting these two accessories.

I used my pressure washer for the past two days and I will give you my experience so far.

Set up was easy but my gas cap, like other reviewers, came broken. Luckily, the gas cap has a metal cap that is molded into a plastic outer... more
Pros: Easy To Use, I'd Buy It Again, Price, Easy To Store
Cons: Packaging, Needs Protection On The Top Of The Box
John Recommends This Generac Product
Brian, the Pressure Washer Expert
Product Expert
John,
Thank you so much for sharing such a great review. This kind of feedback is extremely helpful to other shoppers, and we all really appreciate you taking the time to write it.

Best wishes, and have a great spring.
more
Manufacturer Response
Brand Rep
John,
Thank you for providing us with your highly-detailed review. Your input not only helps future shoppers, but also allows us to review our products and make adjustments and/or changes where we can. We appreciated your constructive feedback, and would like to encourage you to contact us directly at 888-GENERAC (436-3722) if there is something that we can help you with in the future.
more
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328
Michael S.
Purchased from Pressure Washers Direct
Purchased 5/19/14
Total Helpful Votes
23 Helpful Votes
REVIEWED
MAY.
21
2014
5 out of 55 out of 55 out of 55 out of 55 out of 5
Amazing Machine!
My wife and I have a small weekend home on a lake, but we have a huge amount of deck- probably nearly the square footage of the house. And since we also have a monster pine tree that covers a good deal of it, we have a constant problem with pollen and dirt.

For the past couple of years, I have relied on my 1700 psi electric power washer, and it's done a creditable job. But it also takes me the better part of two days to wash the deck. At most I can clean about a 1 1/2 inch swath, and I have... more
Pros: Easy To Use, I'd Buy It Again, Exceeded Expectations, Fast
Cons: Bad Instructions
Michael Recommends This Generac Product
Was this review helpful?
233
Kip E.
Gresham, OR
Purchased from Pressure Washers Direct
Purchased 5/11/14
Total Helpful Votes
21 Helpful Votes
REVIEWED
JUN.
06
2014
4 out of 54 out of 54 out of 54 out of 54 out of 5
Good Cost, Works Pretty Well, But Taking On Chance On Quality
First day in, I opened my package/box for the Generac 3100 PSI unit Moel 0065980, and one of the tips (the Green One) was missing. Nothing was previously opened that I could see. The unit requires little assembly, and although it is hard to carry down stairs because of the plastic foot kit, it is pretty portable. Tires are hard plastic and pretty lousy. The provided pressure hose is completely wimpy and after 2 hours was damaged just be contact with my finished concrete patio. Rubbed all the... more
Pros: Easy To Use, Price, Quiet
Cons: Low Quality, Unreliable
Kip Does Not Recommend This Product
Brian, the Pressure Washer Expert
Product Expert
Kip,
I am sorry to hear you are having problems with your pressure washer. I am also very sorry that, although it's explained in our Return Policy link at the bottom of every page, we didn't explain that is it against Federal Law to re-ship a gas engine that has had fuel in it in our email to you, since it's an explosion/fire hazard. Local stores usually have returned items that have been fueled repaired locally and then re-sell them as "reconditioned" or "refurbished" (or offer them to a reseller in the area).

Being able to swap out an item in person is an advantage that local stores have over Internet stores; we try to balance that with good service, good prices, no sales tax, and by only carrying items with national service networks to support them.

We can certainly help with the replacement of the missing green tip if the folks at Generac haven't been able to ship one to you. If the Authorized Generac Service location isn't providing you with good service, please let us know their phone number and the name of the person you've contacted- we will be happy to ask Generac to contact them directly.
more
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213
William H.
West End, NC
Purchased from Pressure Washers Direct
Purchased 4/14/14
Total Helpful Votes
14 Helpful Votes
REVIEWED
MAY.
21
2014
5 out of 55 out of 55 out of 55 out of 55 out of 5
Great Power Washer, Cheap Hose
I bought the Generac 6598 in April and have used it for about 20 hours. Performance is great, worlds above my previous Karcher electric model.

But today the pressure hose blew out, and no, it was nowhere near the muffler. Generac should supply a more durable hose, even if it is 25' long instead of the 30' provided with this model.
Pros: Easy To Use, I'd Buy It Again, Fast
Cons: Durability
William Recommends This Generac Product
Brian, the Pressure Washer Expert
Product Expert
William,
Most pressure washer companies will cover the hose and spray gun under their Factory Warranty for at least 30 days after the unit was delivered. You are just outside that time frame, but you may want to give the folks at Generac a call, toll free, at (888) 436-3722 x5381 to see if they will send you a replacement.

Hot mufflers have killed many a hose- I'm glad this wasn't the case for you. The other situation to beware with a high pressure hose is a kink, usually sneaking up behind you when you're not looking. 3100 PSI with no place to go will blow any hose (the higher the burst rating, the longer it takes- but a kink will still kill it).

A reasonably priced, better quality replacement would be this Apache 50 ft. M22 hose. It's 5/16" instead of 1/4", but it shouldn't cause a drop in pressure with 3100 PSI.

You could also go up to 3/8" hose which would give you more choices. They are more expensive, and you would need to get a set of M22 to Quick Connect Adaptors.

We appreciate your business, and I apologize for any inconvenience. I hope I've been able to help!
more
William's Experience With Pressure Washers Direct
Web Site
5/5

Service
5/5

Shipping
5/5
"Great price and incredibly fast shipping, with no damage!"
 more
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140
Brian K.
Newnan, GA
Purchased from Pressure Washers Direct
Purchased 3/26/14
Total Helpful Votes
38 Helpful Votes
REVIEWED
APR.
07
2014
5 out of 55 out of 55 out of 55 out of 55 out of 5
Outstanding Value
This machine is unbelievable. Not only is it simple to assemble from the box, but also to prep for full use.

Having used other pressure washers before, I love the reverse trigger! No more sore hands from hours of use.

Adding a surface washer to this unit made the chore of cleaning my driveway into fun.

I strongly recommend this product.
Pros: Easy To Use, Exceeded Expectations, Easy To Store, I'd Buy It Again
Brian Recommends This Generac Product
Brian's Experience With Pressure Washers Direct
Web Site
5/5

Service
5/5

Shipping
5/5
"Even with standard shipping, the unit arrived in a few days. Just in time for a weekend of pressure washing."
 more
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3824
Mike S.
Marietta, GA
Total Helpful Votes
14 Helpful Votes
REVIEWED
JUL.
19
2014
3 out of 53 out of 53 out of 53 out of 53 out of 5
Would Not Buy Again
The order was on time and easy to put together, but blow hi pressure line within 20 mins. I put hose from my old Troybilt and worked great for 3 hrs. Then pump stopped working.

It's in shop now should have back by August.
Pros: Hi Pressure Line Brust The First Time I Used Ite
Cons: Unreliable, Durability, Used Unit 2 Times But Will Not Put Out Ptresse Its In Shop
Mike Does Not Recommend This Product
Was this review helpful?
141
Brent P.
Snohomish, WA
Purchased from Pressure Washers Direct
Purchased 4/20/14
Total Helpful Votes
11 Helpful Votes
REVIEWED
APR.
27
2014
4 out of 54 out of 54 out of 54 out of 54 out of 5
Nice Suprise
So I ordered the Generac 6598 pressure washer. I ordered it on 4/20/2014 and received it on 4/25/2014, great speedy shipping.

The bonus of buying it online is shipping was free and no tax, both of those features I love. I was worried that I was going to have issues during shipping and have no real way to return or get a refund. No need to worry about that the product was perfect when I received it. I opened the box nothing damaged, I checked a few nuts and bolts for tightness and found... more
Pros: Easy To Use, Exceeded Expectations, I'd Buy It Again, Price
Brent Recommends This Generac Product
Was this review helpful?
111
Kevin F.
Aiken, SC
Purchased from Pressure Washers Direct
Purchased 3/15/15
Total Helpful Votes
11 Helpful Votes
REVIEWED
APR.
26
2015
1 out of 51 out of 51 out of 51 out of 51 out of 5
Missing Part
This is good timing. Due to some bad weather and a vacation I had not been able to put my power washer to the test. I recently took it out of the sealed box (no visible holes) and to my dismay it's missing the metal rod that goes into the handle (and you insert the tips).

I would love to be able to write a review but my machine is worthless right now. Do you have the part to send me? I will put off judgement until I can use my power washer but I can't honestly recommend this product without... more
Kevin Does Not Recommend This Product
Brian, the Pressure Washer Expert
Product Expert
Kevin,
It sounds like Generac may have missed that during manufacturing. I apologize for Generacs mistake. However, I ordered a new spray wand for you and you should see it in 7-10 business days. Any questions give me a call at 800-710-7499. Thanks
more
Manufacturer Response
Brand Rep
Kevin,
We would like to apologize for this apparent mishap. Please do not hesitate to contact us directly at 888-GENERAC (436-3722) should you require assistance either locating a replacement for your required part, or if you have any other product-related comments, questions, or concerns. We are sorry for any inconvenience that this experience may have caused.
more
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113
 


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