917 05121 717-04376 Electric PTO Clutch for Cub Cadet MTD Craftsman 717-05121 717-04376A 917-04376, Fits Cub Cadet RZT-L42(08,10-12), RZT-S42(2013 and 2014)

What It Is

This is an electric PTO (power take-off) clutch that engages and disengages your mower blades. It’s designed for Cub Cadet, MTD, and Craftsman lawn tractors and zero-turn mowers, primarily models with 42-inch and 50-inch decks.

Fitment & Compatibility

• Direct OEM replacement for part numbers 717-05121, 717-04376, 917-04376, 917-05121, and 717-04376A.
• Confirmed fits: Cub Cadet RZT-L42 (2008, 2010-2012) and RZT-S42 (2013-2014). Also fits many MTD, Craftsman, and Troy-Bilt models with 42” or 50” decks using a 4-pin connector and 1-1/8” shaft.
• Before buying: Measure your existing clutch’s outer diameter (should be ~4.5”), shaft size (must be 1-1/8”), and confirm your mower uses a 4-pin (not 2-pin) connector. Check your deck size—this is not for 46” or 54” decks unless specified.
• OEM vs aftermarket: This is an aftermarket part, not OEM Cub Cadet. It’s built to OEM specs but may have minor differences in wire length or connector orientation.

Key Things to Know

• Quality: Rated 4.4/5 from 16 reviews. Most users report it works well, but a few note it’s slightly noisier than OEM. Expect 1-3 seasons of typical residential use.
• Installation difficulty: Moderate. You’ll need basic hand tools, a multimeter to test the coil resistance (should be ~3-4 ohms), and a puller tool for the shaft (if stuck). Plan 1-2 hours.
• Common gotchas: The air gap is pre-set—do not adjust. If the clutch doesn’t engage, check your battery voltage (must be 12V+), fuse, and wiring harness for damage. The connector may need slight trimming to fit some mowers.
• Return policy: Since it’s an electrical part, test immediately. Most sellers accept returns only if unused.

Should You Buy It

Buy this if you need a budget-friendly, direct-fit replacement for a Cub Cadet, MTD, or Craftsman with a 42” or 50” deck and 1-1/8” shaft, and you’re comfortable with a moderate DIY install. Avoid if you want OEM-only parts or have a 46”/54” deck—double-check fitment first.