717-04376 Electric PTO Clutch 917-04376 Compatible with Cub Cadet RZT-42 RZT-S42 Compatible with White Outdoor Mustang MTD Bolens Huskee 717-04376A 917-04376A 717-05121 917-05121 X0399

What It Is

This is an electric PTO (power take-off) clutch that engages and disengages the mower blades on your lawn tractor. It’s designed for Cub Cadet RZT-42 and RZT-S42 zero-turn mowers, plus several other MTD-built brands like White Outdoor, Bolens, and Huskee.

Fitment & Compatibility

Before buying, confirm these three things:

• Deck size: This clutch fits 42-inch decks only (RZT-42, RZT-S42). It will not work on 46-inch or larger decks.
• OEM cross-references: It replaces OEM part numbers 717-04376, 717-04376A, 917-04376, 917-04376A, 717-05121, 917-05121, and X0399. Check your old clutch for a stamped number.
• Physical measurements: The clutch has a 1-inch bore shaft, 3-bolt mounting pattern (holes spaced ~4.25 inches apart), and is ~5.5 inches in diameter. Measure your old clutch to verify.

If your mower uses a manual PTO (cable-operated), this electric clutch won’t work—you must have a 12V electrical connector.

Key Things to Know

• Installation difficulty: Moderate. You’ll need basic hand tools (socket set, wrench) and a multimeter to test electrical continuity. Expect 1–2 hours if you’re handy.
• Air gap adjustment: After installation, set the air gap between the clutch rotor and armature to 0.010–0.015 inches using a feeler gauge. Too tight or too loose causes slippage or failure.
• Common gotcha: The clutch pulley may not include a new bearing. If your old bearing is worn, buy it separately (part 918-04376A). Reusing a bad bearing will quickly ruin the new clutch.
• Quality: This is an aftermarket replacement, not OEM Cub Cadet. Most users report it works fine, but some note slightly noisier operation than OEM.

Should You Buy It

Buy this if you need a budget-friendly replacement for a failing PTO clutch on a 42-inch Cub Cadet RZT or compatible MTD mower, and you’re comfortable with basic mechanical work. Skip it if you want OEM reliability or if your mower has a larger deck—then buy the exact OEM part for your model.