HOLDWELL Electric PTO Clutch 717-04376 917-04376 717-05121 917-05121 Compatible with Cub Cadet RZT-42 RZT-S42

What It Is

This is an aftermarket electric PTO (power take-off) clutch that engages and disengages your mower blades via an electromagnetic coil. It’s designed for Cub Cadet RZT-42 and RZT-S42 zero-turn mowers, replacing OEM part numbers 717-04376, 917-04376, 717-05121, and 917-05121.

Fitment & Compatibility

Before buying, verify three things:

• Model # – Works with RZT-42 and RZT-S42 only. Check your mower’s model tag under the seat or on the frame.
• OEM cross-reference – Replaces Cub Cadet 717-04376, 917-04376, 717-05121, 917-05121. If your original clutch has a different number, it won’t fit.
• Physical dimensions – Measure your old clutch: shaft diameter (typically 1" or 7/8"), bolt pattern (usually 4-bolt, 3.5" center-to-center), and overall thickness (approx. 2.5"). This aftermarket unit matches those specs, but confirm against your original.

Key Things to Know

• Build quality – HOLDWELL is a budget aftermarket brand. Users report it works well initially, but longevity may be shorter than OEM. Expect 1-2 seasons under normal residential use.
• Installation difficulty – Moderate. You’ll need basic hand tools (wrenches, sockets), a feeler gauge to set the air gap (0.012–0.020" typical), and a multimeter to test coil resistance (around 3–4 ohms). No special wiring harness modifications needed—plugs are direct-fit.
• Common gotchas – The clutch may require re-gapping after first 2-3 hours of use if it slips. Also, check that your battery voltage is 12V+; low voltage can cause intermittent engagement.
• No warranty support – Some sellers offer 30-day returns, but don’t expect replacement beyond that. Keep your receipt and test immediately upon arrival.

Should You Buy It

If you need a quick, affordable fix for a Cub Cadet RZT-42 or RZT-S42 and you’re comfortable with a moderate DIY install, this is a solid budget option. But if you mow commercially or want maximum reliability, spend more on an OEM Cub Cadet clutch (around $180–$220) for better durability and warranty support.