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AquaNaut 400 - 4-Wheel Drive, Pools up to 20' x 40' (Open Line)

Hayward

SKU: W3PHS41CST

Patented V-Flex™ variable vane turbine technology handles larger debris without clogging and maximizes suction power at virtually any flow, making them ideal for use with variable speed pumps.

Features

The AquaNaut® Series of automatic suction pool cleaners were the first all-terrain, clog-eliminating suction cleaners on the market and they remain the best in their class. Available in two or four wheel drive models, AquaNaut is designed with patented technologies to deliver superior power, traction and balance for pools of different shapes, sizes, flow rates and debris types. They feature patented self-adjusting variable vanes known as V-Flex™ technology, which automatically adjust to allow for large debris to pass through the cleaner delivering maximum suction power at virtually any flow and providing a clog-free clean — covering pool floor, walls* and coves.

Features and Benefits

  • Patented V-Flex variable vane turbine technology eliminates clogs and maximizes power at almost any flow.
  • Perfect for use with variable-speed pool pumps.
  • Patented high-traction tires with rugged treads provide superior climbing power and motion on all surfaces.
  • Patented adjustable roller skirt maintains optimal suction on uneven surfaces.
  • Multiple pre-programmed steering sequences ensure complete pool coverage.
  • Three easily interchangeable throats improve debris passage and suction performance, making it ideal for use with variable-speed pool pumps.

  • NOTE: *Wall climbing capability and pool coverage may be affected by specific pool shapes and surfaces. The cleaner may not climb the wall under certain conditions.

Application New Construction, Renovation, Aftermarket
Brand Hayward
Channel Open Line
Color Multi
GTIN 610377389969
Warranty - Labor None
Master Carton Qty 1
Warranty - Parts 1-year
Pool Type In Ground
Shipping Dimensions 11.9 " x 13.7 " x 40.4 "
Shipping Weight 19.888 lb
Traction System 4-Wheel Drive
Parts Details

Click on the part number in the diagram to display the details.

Questions & Answers

15 answered question(s)

06/24/26

Q: i have an aquanaut 400. I have 2 but one has the rear wheels not engaged with the grey spline gear; so not moving; all seems ok , not worn and not misaligneded. The good unit has the rear wheels turning by the inside wheel gears; where the faulty one has the grey spline gear in the center of the gears; not touching either. . Changing the grey spline shaft will not do anything as its normal, nor worn. Must be alignment but. all seems to be straight , in order. Allot of slop in the design to begin with for fitting any gears, splines.

A:
Hi, for help with this contact a local Hayward Authorized Service Center. You can find a list of them by clicking on the Dealer Locator tab on the home page of our website Hayward.com

By Hayward Support

06/24/26

Q: I need replacement tires for my Aquanaut 400 4 wheel drive. How can I obtain them?

A:
We do not sell direct, but you can find a list of local Hayward Authorized Dealers by clicking on the Dealer Locator tab on the home page of our website Hayward.com

By Hayward Support

06/24/26

Q: How to remove & replace vanes / rotor assembly? It seems I have to lift out main gear shaft but it doesn’t lift out easily and I don’t want to break it.

A:
Hi, unless you are familiar with repairing this product we recommend you allow a professional to do the repair. You can find a list of them by clicking on the Dealer Locator tab on the home page of our website Hayward.com

By Hayward Support

06/24/26

Q: I need replacement tires part numbers for the front and rear wheels for my AquaNaut 400 please.

A:
Hi, someone from our Technical Service Department will contact you via email.

By Hayward Support

06/24/26

Q: aquanaut 400 a parts list would be nice, a couple of your listed suppliers carry spare parts like the gears and shafts

A:
Hi, someone from our Technical Service Department will contact you via email.

By Hayward Support

06/24/26

Q: i have a new 4 wheeler and it gets stuck facing the wall because instead of turning left or right, it does a complete 360 degrees and most of the time ends up facing the same wall still.

A:
Hi, follow the steps outlined in the attached manual to ensure the suction is correct to the cleaner. If that does not remedy the issue give our tech support group a call at 908-355-7995 https://hayward.com/media/akeneo_connector/asset_files/I/S/ISSC100_RevE_34f4...

By Hayward Support

06/24/26

Q: Of my two choices...the Aquanaut and the TracVac, which one will work better at higher flow and negative pressure from a high-HP VS pump? I may not always want to use high speed, but I cannot always guarantee the pump won't run at that speed.

A:
Hi, both of these cleaners have required flow rates, and operating them outside those rates can cause issues with performance and reliability.

By Hayward Support

06/24/26

Q: Does the Aquanaut 400 come with hoses? If not, how much are the hoses?

A:
Yes it does come with hoses.

By Hayward Support

06/24/26

Q: My pump is working fine, but my Aquanaut 400 has stopped moving. I can't see any obstructions. What should I do?

A:
Hi, for help with this contact a local Hayward Authorized Service Center. You can find a list of them by clicking on the Dealer Locator tab on the home page of our website Hayward.com

By Hayward Support

06/24/26

Q: The gears on the turbine are broken. Can I get instructions on replacing the turbine?

A:
Hi, for help with this contact a local Hayward Authorized Service Center. You can find a list of them by clicking on the Dealer Locator tab on the home page of our website Hayward.com

By Hayward Support

06/24/26

Q: Is the AquaNaut 450 a successor model to the AquaNaut 400? In other words, are there any significant differences between the two models?

A:
Hi, they are the same cleaner.

By Hayward Support

06/24/26

Q: What Hayward in ground pool is the best around pool run cleaner.

A:
Hi, there's a lot that goes into answering this question. Things like the size of the pool, and type of cleaner you are looking for must be answered before a decision can be made on which is the best cleaner for you. We make a wide range of cleaners...

By Hayward Support

06/24/26

Q: What is the part number for the Aquanaut 400 tires?

A:
HI, the standard tire is PVXS16PK2-234

By Hayward Support

06/24/26

Q: I have a 4-wheel version of your pool vacuum and have been very happy with it - until now. It is 3 years old and began to show signs of wear and was not able to maintain traction. I purchased the lower gear "kit" because some of the gears were worn (not missing) and I replaced the tires, which were beyond the wear marks. All the gears, the turbine, the tires have been replaced. However, when I put it in the pool I found that the wheels/tires turn quite nicely but the vacuum was not getting enough traction to move about the pool. I took all floats off the line except two that I kept at about 24 inches from the vacuum, per the manual's. There were two other floats that were also underwater that I removed, thinking they were "lifting" the unit sufficiently to cause slippage of the tires. No improvement. I increased and decreased suction using my VacMate lever, no change. I am at a loss. Can you help?

A:
For help with this contact a local Hayward Authorized Service Center. You can find a list of them by clicking on the Dealer Locator tab on the home page of our website Hayward.com Or, you can give our tech support group a call at 908-355-7995

By Hayward Support

06/24/26

Q: I need to purchase the large orifice for a Howard aquanaut 400 cleaner

A:
Hi, we do not sell direct, but you can find a list of local Hayward Authorized Dealers by clicking on the Dealer Locator tab on the home page of our website Hayward.com

By Hayward Support