Kubota Z400 / Z700 Series diesel zero-turn ROPS retention bolt recall

## Affected machines About 11,675 Kubota Z400 / Z700 Series diesel zero-turn mowers built between **November 29, 2017 and August 1, 2018**. The recalled units are orange and black with the model on the side of the mower and the data plate on the side. ### Z400 Series (~7,382 units) | Model | Begin SN | End SN | |---|---|---| | Z411KW-48 | 12823 | 14587 | | Z421KW-54 | 15715 | 18795 | | Z421KWT-60 | 16864 | 20127 | ### Z700 Series (~4,293 units) | Model | Begin SN | End SN | |---|---|---| | Z723KH-2-48 | 50001 | 50176 | | Z724XKW-2-48 | 50007 | 51131 | | Z724KH-2-54 | 50004 | 50828 | | Z724XKW-2-54 | 50003 | 51130 | | Z725KH-2-60 | 50001 | 50657 | | Z726XKW-2-60 | 50008 | 52361 | Serial-number suffix conventions: **KH** = Kohler engine, **KW** = Kawasaki, **X** = with ROPS, **T** = ?, **-2** = second generation, with deck size suffix (-48, -54, -60). ## Issue The ROPS (Rollover Protective Structure) retention bolts may be loose. If the bolts loosen further or fail entirely during a rollover event, the ROPS could shift or detach, leaving the operator without protection. Reported field incidents at time of recall: none. The recall was preventive based on engineering review of bolt-torque records. ## What to do 1. Check your mower's model and serial number against the tables above. 2. If your mower is in scope, **stop using it immediately**. 3. Contact Kubota Tractor Corporation at (888) 458-2682 (888-4KUBOTA) Monday-Friday 8 a.m. - 5 p.m. CT to schedule a free inspection and free repair. 4. Until the dealer inspection is complete, ensure the seat belt is worn and the ROPS is in the upright/locked position whenever the mower is operated — these are baseline rollover-protection measures regardless of the bolt issue. ## Hazard Severity is rated **critical** because a compromised ROPS is potentially fatal in a rollover. ## Source - Kubota Safety Notices page, "Z400/Z700 Notice — Kubota Recalls Zero Turn Mowers Due to ROPS Hazard (Recall Alert)." - Sold at authorized Kubota dealers nationwide from November 29, 2017 to August 1, 2018 for between $6,560 and $10,035. ## Library notes The three Z400 Series rows (Z411KW-48, Z421KW-54, Z421KWT-60) are existing library entries. The six Z700 Series commercial variants (Z723KH-2-48, Z724XKW-2-48, Z724KH-2-54, Z724XKW-2-54, Z725KH-2-60, Z726XKW-2-60) are added in this migration. The existing Z724KW-48 row is the consumer KW variant (year_start 2018) and is distinct from these recall rows — the Z724XKW-2-48 row added here has the X (with-ROPS) and -2 (second generation) suffixes that distinguish the commercial line.