Kubota Z726XKW fire hazard from Kawasaki engine voltage regulator (CPSC 24-256)

## Affected machines This bulletin covers the **Kubota Z726XKW** portion of CPSC recall 24-256. The Z726XKW is a Kubota Z700 Series commercial-residential zero-turn mower equipped with a Kawasaki engine. The recall is **engine-specific**, not mower-specific. Z726XKW units in scope are those with a Kawasaki engine (model year 2021-2023) bearing the defective 21066-0785 voltage regulator. The engine model and serial numbers are on the engine fan housing. ### Recalled Kawasaki engine models (MY 2021-2023) FJ400D, FS600V, FS651V, FX691V, FX730V, FX801V, FX850V, FXT00V. The Z726XKW typically uses the FX801V; check your specific machine. The full list of specification numbers is published on the Kawasaki product-recall page (linked below). ## Issue The **21066-0785 voltage regulator** in the recalled Kawasaki engines can fail thermally. When the voltage regulator fails, the engine overheats and can ignite. Critically, **the failure can occur while the equipment is in storage** — not just during operation. Owners cannot rely on simply parking the mower as a workaround. A widely-shared mitigation among owners while waiting for the dealer repair is to **disconnect the negative battery terminal** when the mower is not in use, since the voltage regulator's failure mode involves continued current flow. Reported field incidents at time of recall (US): - 8 reports of fires - 0 injuries ## What to do 1. Find your engine model and serial number on the engine fan housing of your Z726XKW. 2. Check your engine model against the list above; if it's one of the eight covered models, also confirm the specification number against Kawasaki's published list at https://kawasakienginesusa.com/support-resources/product-recall. 3. If your mower is in scope, **stop using it immediately** and store it away from combustible materials. Consider disconnecting the battery's negative terminal as an additional precaution while waiting for the dealer repair. 4. Contact Kubota Tractor Corporation at (888) 458-2682, Monday-Friday 7 a.m. - 6 p.m. ET. Or visit https://www.kubotausa.com/service-support/safety/safety-notices. 5. You may also contact Kawasaki Motors USA directly at (866) 836-4463. ## Related bulletins A sibling bulletin **TNB02600026** covers the John Deere Z760R portion of the same CPSC 24-256 recall. Other affected brands (Bad Boy, BigDog, Bobcat, Cub Cadet, Hustler) are not currently in the TractorNuity library; owners of those brands should follow the manufacturer-specific contact information published at https://www.cpsc.gov/Recalls/2024/Kawasaki-Motors-USA-Recalls-Engines-Used-in-Bad-Boy-Mowers-BigDog-Bobcat-Cub-Cadet-Hustler-John-Deere-and-Kubota-Brand-Lawn-and-Garden-Equipment-Due-to-Fire-and-Burn-Hazards. ## Hazard Severity is rated **critical** because of the fire risk, including the in-storage failure mode that can ignite without operator presence. ## Source - U.S. Consumer Product Safety Commission, recall 24-256, "Kawasaki Motors USA Recalls Engines Used in Bad Boy Mowers, BigDog, Bobcat, Cub Cadet, Hustler, John Deere and Kubota Brand Lawn and Garden Equipment Due to Fire and Burn Hazards," June 6, 2024. - Kubota Safety Notices page (lists Z726XKW under "Kawasaki Engines in Z726XKW Mowers"): https://www.kubotausa.com/service-support/safety/safety-notices - Kawasaki product recall page: https://kawasakienginesusa.com/support-resources/product-recall/product-recall-24-256 - Sold at Kubota dealers nationwide from April 2021 through December 2023. ## Library notes The Z726XKW row is added in this same migration (Z700 Series, MY2021-2023, ~25.5 hp Kawasaki FX801V engine).