A worn Keller ball joint does not have to be thrown away. The housing is threaded into your A-arm and is usually still perfectly good — what wears is the cup, the boot and the pin. This rebuild kit replaces exactly those three parts with the same components your joint was built with, so a tired joint is serviced in place instead of replaced at full price.
Ten versions cover the Polaris Keller range, from the standard RZR XP 1000 joint through the Turbo S, Pro XP and RS1 joints, the Ranger joints, and the Mega versions of each. Match the kit to your joint's part number, not to your machine.
Key Features
- Includes a new cup, boot and 4340 steel heat-treated pin
- The exact same parts supplied with your original Keller ball joint
- Rebuilds the joint at roughly half the cost of a new one
- Ten kits covering standard and Mega Polaris Keller joints
- Keeps the threaded housing in the A-arm — no need to break the joint loose from the arm
- Made in USA
Built To Solve: Worn Keller Ball Joints on Polaris RZR and Ranger Machines
- Play developing in a joint that has covered years of hard miles
- A gritty or notchy feel when the stud is articulated by hand
- A joint contaminated after a boot tore and let water and dirt in
- Front-end clunk returning on a machine whose joints were fine last season
- Facing the cost of new joints when only the internals are worn
- Wanting a service pack on the shelf before a big trip
Best For: Polaris Owners Servicing Keller Joints They Already Run
- RZR XP 1000, XP Turbo, Turbo S, Pro XP and RS1 owners running Keller joints
- Ranger and Ranger XP 1000 owners running Keller joints
- Riders running Mega Keller joints who do not want to disturb modified A-arms
- High-hour machines where the housings are sound but the internals are done
- Anyone who bought Keller specifically because the joints are rebuildable
If the boot has torn but the joint is still tight, you do not need this kit — the Keller boot replacement kit is the cheaper repair. If the housing itself is damaged, you need a new joint.
Specifications
- Kit contents: new cup, new boot, and 4340 steel heat-treated pin
- Components are the same parts originally supplied with the Keller ball joint
- Sold as: one kit per Keller joint — selected by joint part number
- Coverage: ten kits spanning standard and Mega Polaris Keller joints
- Manufacturer Part Number: BJK-P-XP1KT-PK, BJK-P-XP1KT-HCR-PK, BJK-P-XP1KT-MP-PK, BJK-P-XP1KR-L-PK, BJK-P-RG-PK, BJK-P-TSPR-PK, BJK-P-TSPR-HCR-PK, BJKM-P-MXP1KT-PK, BJKM-P-MRG-PK, BJKM-P-MTSPR-PK
Fitment
These kits are matched to your ball joint, not to your machine. Keller publishes rebuild-kit fitment by joint part number — read the number off the joint before ordering.
- BJK-P-XP1KT-PK — services the standard BJK-P-XP1KT joint, the most widely used Polaris Keller joint
- BJK-P-XP1KT-HCR-PK — services the RZR XP 1000 upper joint used with HCR arms
- BJK-P-XP1KT-MP-PK — services the RZR XP 1000 mud pin joint
- BJK-P-XP1KR-L-PK — services the Ranger XP 1000 lower joint, 2021 onward
- BJK-P-RG-PK — services the Polaris Ranger joint, up to 2018
- BJK-P-TSPR-PK — services the RZR Turbo S, Pro XP and RS1 joint
- BJK-P-TSPR-HCR-PK — services the RZR Turbo S, Pro XP and RS1 joint used with HCR arms
- BJKM-P-MXP1KT-PK — services the RZR XP 1000 Mega joint
- BJKM-P-MRG-PK — services the Polaris Ranger Mega joint, up to 2018
- BJKM-P-MTSPR-PK — services the RZR Turbo S Mega joint
These kits are for Keller ball joints only. They do not service OEM joints or other aftermarket brands. Fitment is not guaranteed on joints not listed above.
FAQ
What is in the rebuild kit?
A new cup, a new boot, and a 4340 steel heat-treated pin — the same three parts your Keller joint was built with. Those are the components that actually wear; the threaded housing generally is not.
How do I know which kit I need?
By the part number on the ball joint, not by your machine. Several Polaris models share the same Keller joint, and a few models use a specific version — the HCR-arm and mud pin joints in particular have their own kits.
Do I have to remove the ball joint from the A-arm?
The housing stays threaded into the arm; what you are replacing is what sits inside it. Keller does not publish a step-by-step rebuild procedure on this product, so if you have not done one before, allow time and work carefully rather than assuming it matches another brand's process.
Is rebuilding actually worth it versus buying a new joint?
Keller puts the kit at roughly half the price of a new ball joint, and the housing — the expensive, precisely threaded part — is reused. On a machine with several worn joints the saving is significant.
My boot tore but the joint feels fine. Do I need this?
Probably not. If there is no play and the stud still moves smoothly, the Keller boot replacement kit reseals it for less. Use this rebuild kit when the internals have actually worn.
Does this fit Mega Keller joints too?
Yes. Three of the ten kits service Mega joints — the RZR XP 1000 Mega, the RZR Turbo S Mega and the Ranger Mega. That matters if your A-arms were machined for Mega housings, because rebuilding avoids disturbing that work.
Why Keller
The rebuildable design is the whole argument for Keller. A joint that threads into the A-arm and comes apart for service is one you fix rather than replace, and this kit is what makes that promise real — the same cup, boot and pin the joint was assembled with, sold on their own.
Service Your Polaris Keller Joints Before They Let Go
Before ordering, read the part number off the joint and match it against the list above — the HCR-arm and mud pin versions have their own kits and are easy to get wrong. Order one kit per joint you intend to rebuild. If a boot has split but the joint is still tight, the Keller boot replacement kit is the right part instead. Riders who ride hard often keep a rebuild kit in the trailer, since a joint that starts to feel gritty on day one of a trip is repairable rather than trip-ending.
Installation Video
Official SuperATV installation walkthrough with Todd Keller: How To Install Keller Ball Joints
