K3011-10050 X0831 PTO Clutch for Kubota Z121SKH Z122EBR Z125EBR Z411KW Replace# K3071-10050

What It Is

This is an aftermarket PTO (Power Take-Off) clutch that engages and disengages your mower blades on Kubota zero-turn mowers. It replaces OEM part K3071-10050 and fits specific Z100-series and Z400-series models.

Fitment & Compatibility

Check your mower model and deck size. This clutch fits Kubota Z121SKH, Z122EBR, Z125EBR, and Z411KW models. It also works on Z421KW, Z422KW, Z423KW, Z442KW, and Z443KW units. Do not rely solely on the “fits” list – measure your existing clutch’s bolt pattern (typically 3-bolt, 4.5” diameter) and shaft size (usually 1” diameter with a 3/16” keyway). OEM part cross-reference is K3071-10050, but verify your machine’s serial number range with Kubota’s parts lookup. This is a direct-fit replacement, but aftermarket clutches may have slight variations in wire harness length or connector type.

Key Things to Know

• Installation difficulty: Moderate. You’ll need basic hand tools (wrenches, socket set) and a feeler gauge for air gap adjustment (0.012”–0.020” is typical). Expect 1–2 hours.
• Quality note: This aftermarket clutch is rated 4.9/10, suggesting good build quality for the price. It’s not OEM, but many users report equal performance.
• Common gotcha: The air gap may be pre-set too tight or too loose. Always check and adjust before installing to avoid premature wear or slipping.
• Wiring tip: The clutch uses a two-wire connector. If your machine’s harness is damaged, you may need to splice or replace the connector. Match wire colors carefully.

Should You Buy It

If you need a reliable, cost-effective PTO clutch for your compatible Kubota Z100 or Z400 series mower and are comfortable with a moderate DIY install, this is a solid choice. It’s significantly cheaper than OEM (often $300+), and the high rating suggests it holds up well. Skip it if you want zero-hassle OEM fitment or have a machine outside the listed models.