Polaris 39-420 wheel sprocket assembly with bearing for the 3900 Sport pool cleanerPolaris Genuine OEM Wheel Sprocket Assembly with Bearing (3900), 39-420 In stock$2799
Polaris 39-420 wheel sprocket assembly with bearing for the 3900 Sport pool cleaner
Shop all Polaris

Polaris Genuine OEM Wheel Sprocket Assembly with Bearing (3900), 39-420

Ask a questionMPN 39-420
$2799
In stock
Get volume pricing Request a quote

30 day returns · Easy, with prepaid labels provided

Quick overview

  • Genuine Polaris Factory part 39-420, not an aftermarket copy.
  • For the 3900 Sport The wheel sprocket assembly used on the Polaris 3900 Sport pressure cleaner.
  • Bearing included The assembly comes with its bearing, so the whole wear point is renewed in one go.
  • Drives the wheel The sprocket is what turns belt drive into wheel rotation, so a worn one leaves the cleaner crawling or stuck.
  • Sold as an assembly Supplied complete rather than as loose sprocket and bearing pieces.
  • Check all wheels together Wear tends to be even across a cleaner, so inspect the other wheel positions while you have it apart.
Full description and specifications ↓

Need a hand?

Bilingual support from pool professionals.
(888) 751-8084CallChat with a techChatEmail usEmail

Send us a message

A pool professional will get back to you, usually the same business day.

About Polaris Genuine OEM Wheel Sprocket Assembly with Bearing (3900), 39-420, SKU POL-201-4913. We will include it with your message.

We use your details to answer this message and nothing else.

Frequently bought together

Current item Polaris Genuine OEM Wheel Sprocket Assembly with Bearing (3900), 39-420
Polaris

Genuine OEM Wheel Sprocket Assembly with Bearing (3900), 39-420

$2799
Polaris Genuine OEM Tail Sweep Hose Scrubber, 9-100-3105
Polaris

Genuine OEM Tail Sweep Hose Scrubber, 9-100-3105

$799
Polaris Genuine OEM 3900 All-Purpose Dual-Chamber Zippered SuperBag, 39-310
Polaris

Genuine OEM 3900 All-Purpose Dual-Chamber Zippered SuperBag, 39-310

$6199
Polaris Genuine OEM Complete 31-Foot Feed Hose with Backup Valve and In-Line Filter, 48-070
Polaris

Genuine OEM Complete 31-Foot Feed Hose with Backup Valve and In-Line Filter, 48-070

$28999
Polaris Genuine OEM Back-up Valve, Complete, White (180, 280, 380, 3900)
Polaris

Genuine OEM Back-up Valve, Complete, White (180, 280, 380, 3900)

$11299
Polaris Genuine OEM Hose Swivel for 380/280/180 Pool Cleaners
Polaris

Genuine OEM Hose Swivel for 380/280/180 Pool Cleaners

$2599
Polaris Wall Fitting Connector Assembly (380/280/180/3900), 9-100-9001
Polaris

Wall Fitting Connector Assembly (380/280/180/3900), 9-100-9001

$4399
Subtotal

Similar products

Other products people compare with this one.

Polaris R0547500 3900 Sport drive sprocket assembly Polaris Genuine OEM 3900 Drive Sprocket Assembly, R0547500$2799 Polaris 9-100-1108 genuine wheel ball bearing Polaris Genuine OEM Wheel Ball Bearing, 9-100-1108$1999 Polaris 48-140 feed hose connector assembly for the 3900 Sport pool cleaner Polaris Genuine OEM Feed Hose Connector Assembly (3900), 48-140$3299 Polaris 39-006 vacuum tube and feedpipe assembly with O-ring for the 3900 Sport Polaris Genuine OEM Vacuum Tube/Feedpipe Assembly with O-Ring, 39-006$3999 Polaris 9-100-9002 pressure relief valve for 180, 280, 380 and 3900 pressure cleaners Polaris Genuine OEM Pressure Relief Valve for 180/280/380/3900/P39/P40/TR28P Pool Cleaners, 9-100-9002$1799 Polaris 48-232 black WideTrax tire for the 3900 Sport cleaner Polaris Genuine OEM 3900 WideTrax Tire, Black, 48-232$3199 Top view of the Polaris 48-222 in-line filter screen Polaris Genuine OEM Screen, In-Line Filter (280/380/3900), 48-222$2199 Polaris R0538000 head float kit for the 3900 Sport pool cleaner Polaris Genuine OEM 3900 Head Float Kit, R0538000$2099 Polaris 48-036 genuine OEM wheel lock screw 3-pack for the 3900 and 480 cleaners Polaris Genuine OEM Wheel Lock Screw 3-Pack, 48-036$1899 Polaris 39-005 rear housing for the 3900 Sport pool cleaner Polaris 3900 Sport Genuine OEM Rear Housing, 39-005$2499
Polaris 48-240 black feed hose connector assembly Polaris Genuine OEM Feed Hose Connector Assembly, Black, 48-240$3199 Polaris 3900 chain tensioner kit 39-120 Polaris Genuine OEM 3900 Chain Tensioner Kit, 39-120$4099 Polaris 10-108-00 UWF restrictor kit for 380, 280, 180 and 3900 cleaners Polaris Genuine OEM UWF Restrictor Kit (380/280/180/3900), 10-108-00$1999 Polaris 6-500-00 white universal wall fitting collar (UWF) Polaris Genuine OEM Universal Wall Fitting Collar (UWF), 6-500-00$1499 Polaris 39-021 blue sweep hose wear ring for the Polaris 3900 pool cleaner Polaris Genuine OEM Sweep Hose Wear Ring, Blue (Each), 39-021$1699 Polaris 39-440 front axle block assembly for the 3900 Sport pool cleaner Polaris 3900 Sport Front Axle Block Assembly, 39-440$1499 Polaris D29 universal wall fitting quick disconnect in white Polaris Universal Wall Fitting Quick Disconnect, White (380/280/180/3900)$1699 Polaris D21 black ball bearing hose swivel for BlackMax 280, 380, 480 and 3900 cleaners Polaris Hose Swivel, Black$2499 Polaris 6-504-00 metal filter screen for the Universal Wall Fitting Polaris Filter Screen for Universal Wall Fitting, UWF/QD 6-504-00$1699 Polaris 39-300 genuine OEM water management system assembly with o-ring for the Polaris 3900 Polaris Genuine OEM Water Management System Assembly with O-Ring (3900), 39-300$4599

Product details

Polaris 39-420 is the wheel sprocket assembly with bearing for the Polaris 3900 Sport pool cleaner. It is the genuine OEM part, supplied complete with its bearing rather than as separate pieces.

What it does

The sprocket is the link between the drive train and the wheel. When it wears, or when the bearing inside it goes rough, the wheel stops turning cleanly and the cleaner starts stalling, tracking oddly or parking itself in one corner of the pool. Owners often chase the belts or the water pressure first, when the sprocket is the part that has given up.

While you are in there

Wear on a 3900 is usually even across the machine, so once one sprocket assembly has failed the others are close behind. Turn each wheel by hand and feel for play or grinding before you close the cleaner back up.

Specifications
Brand Polaris
Manufacturer part number 39-420
UPC 738919066977
Type Wheel sprocket assembly with bearing
Part type Pool cleaner part
Fits Polaris 3900 Sport pool cleaner
Shipping weight 0.15 lb
Ships Parcel

Request a quote

Need a volume price, a freight quote, or pricing in writing before you order? We reply the same business day.

Request a quote

From Polaris

Two women sitting at the edge of a pool with their feet in the water. Goodbye pool chores, hello swim time. Polaris

Polaris cleaners

Polaris 280 Pressure Side Automatic Pool Cleaner Polaris 3900 Sport Automatic Pool Cleaner Polaris 9550 4WD Sport Robotic Pool Cleaner with Remote, F9550 Polaris 3/4 HP Booster Pump, Complete, PB4-60
Shop Polaris cleaners

Genuine Polaris parts

Polaris Genuine OEM Tail Sweep Hose Scrubber, 9-100-3105 Polaris Genuine OEM 180/280 Factory Tune-up Kit Polaris Genuine OEM Back-up Valve, Complete, White (180, 280, 380, 3900) Polaris Genuine OEM 3900 All-Purpose Dual-Chamber Zippered SuperBag, 39-310
Shop Polaris parts
Robotic cleaners: a Polaris Freedom cordless robotic cleaner on a pool deckPressure cleaners: a Polaris 280 pressure side cleaner
Polaris makes pressure side, suction and robotic pool cleaners, booster pumps and genuine replacement parts.Shop all Polaris

Customer reviews

More from Polaris

Polaris Unibridge 5820 main drain cover bridge in white Polaris Unibridge Main Drain Cover, White, 5820$10699 Polaris 9-100-3105 tail sweep hose scrubber Polaris Genuine OEM Tail Sweep Hose Scrubber, 9-100-3105$799 Polaris 48-070 complete 31 ft feed hose assembly with backup valve and in-line filter Polaris Genuine OEM Complete 31-Foot Feed Hose with Backup Valve and In-Line Filter, 48-070$28999 Polaris 39-310 all purpose dual chamber zippered SuperBag for the 3900 Sport Polaris Genuine OEM 3900 All-Purpose Dual-Chamber Zippered SuperBag, 39-310$6199 Polaris R0536300 front housing volute with o-ring for new style PB4-60 booster pumps Polaris Front Housing Volute Cover with O-Ring, R0536300$6699 Polaris 280 pressure side automatic pool cleaner, complete Polaris 280 Pressure Side Automatic Pool Cleaner$59900 Web Price Polaris A49 factory tune up kit for 180 and 280 pressure side pool cleaners Polaris Genuine OEM 180/280 Factory Tune-up Kit$34099 Polaris 3900 Sport F6 pressure side automatic pool cleaner Polaris 3900 Sport Automatic Pool Cleaner$99599 Polaris C10 MaxTrax tire for 180, 280, 360 and 380 pressure cleaners Polaris Genuine OEM Tire, MaxTrax (180/280/380/360)$2199 Polaris G52 complete back-up valve, white, for 180, 280, 380 and 3900 Sport cleaners Polaris Genuine OEM Back-up Valve, Complete, White (180, 280, 380, 3900)$11299
Polaris C11 genuine black tire for 180, 280, 360 and 380 pool cleaners Polaris Genuine OEM Tire, Black$2299 Polaris 9-100-3100 Polaris 360 feed hose complete, corrugated hose with swivels and floats Polaris 360 Feed Hose Complete, Genuine OEM, 9-100-3100$24699 Polaris R0912100 K13 all purpose zipper debris bag with tail scrubber for the Polaris 280 cleaner Polaris All Purpose Zipper Bag K13 with Tail Scrubber for 280 Pool Cleaner, R0912100$3699 Polaris R0765500 replacement brush for the 7000 above ground pool cleaner Polaris Brush for 7000 Above Ground Cleaner, R0765500$5799 Polaris 9-100-1005 complete internal frame for 360 and 380 pressure side cleaners Polaris Genuine OEM Frame Complete (360/380), 9-100-1005$11099 Polaris 9-100-3102 genuine 6 ft cuffless feed hose for the Polaris 360 pool cleaner Polaris 360 Pool Cleaner Feed Hose, Genuine OEM 6 Ft Replacement Hose 9-100-3102, No Cuffs$3499 Polaris R0765400 7240 Sport replacement brush Polaris Genuine OEM 7240 Sport Brush, R0765400$5699 Polaris R0897800 fine filter canister for Epic and EVO robotic cleaners Polaris Epic 8520 Fine Filter Canister, R0897800$7799 Polaris 9-100-9010 factory tune-up kit for the 380 and 360 pressure cleaners Polaris Genuine OEM 380/360 Factory Tune-Up Kit, 9-100-9010$22099 Polaris D20 genuine hose swivel for 180, 280, 380, 3900 and 480 Pro cleaners Polaris Genuine OEM Hose Swivel for 380/280/180 Pool Cleaners$2599

Questions and answers

What people ask about this product, answered by our pool techs.

Which cleaner does this fit?
The Polaris 3900 Sport. Polaris part number 39-420.
Does the bearing come with it?
Yes. The bearing is part of the assembly.
Is this a genuine Polaris part?
Yes. It is the OEM Polaris replacement, not a copy.
How many does a cleaner take?
Order by position. Check each wheel on your 3900 for play or a worn sprocket and buy one assembly per wheel that needs it.
Ask your own question