The ROP Shop | New HD PTO Clutch for MTD Cub Cadet Troy Bilt ZT RZT 42 50 Mustang XP 917-04622, Upgraded Heavy Duty Design

What It Is

This heavy-duty PTO (power take-off) clutch engages and disengages your mower blades. It’s an upgraded aftermarket replacement for MTD, Cub Cadet, and Troy-Bilt zero-turn mowers with 42- or 50-inch decks, designed to handle more torque and last longer than the OEM part.

Fitment & Compatibility

• Check your OEM part number: This replaces 917-04622, 917-04622A, 917-04622B, and 917-04622C. Confirm your current clutch matches one of these.
• Deck size: Fits 42-inch and 50-inch decks on ZT and RZT series (e.g., Cub Cadet RZT 42/50, Troy-Bilt Mustang XP 42/50).
• Electrical: 12V DC, single-wire engagement (ground through the clutch body). Measure your old clutch’s coil resistance (should be ~3.0–3.5 ohms) to verify compatibility.
• Shaft & bolt pattern: Three-bolt mount with 1-inch bore. Measure your crankshaft diameter and bolt spacing (center-to-center ~2.75 inches) before buying.
• Air gap: Typically 0.010–0.015 inches. If your old clutch had a different gap, you may need to adjust this one.

Key Things to Know

• Installation difficulty: Moderate. Requires basic mechanical skills, a puller (often needed to remove old clutch), and a torque wrench (bolts to 35–45 ft-lbs). Expect 1–2 hours.
• Upgraded design: Uses heavier-duty bearings and thicker friction material vs. OEM. Some users report longer life, but it’s slightly heavier—check clearance if you have a tight deck.
• Common gotcha: The wire connector may be a different shape than your harness. You might need to splice or replace the connector (included in some kits). Also, ensure the clutch is fully seated on the shaft before tightening—partial seating causes vibration and early failure.
• Noise: May be slightly louder than OEM on engagement due to the heavier internals. This is normal for an HD upgrade.

Should You Buy It

If your OEM clutch failed prematurely or you mow heavy grass, this HD upgrade is a solid value for the price. It fits most common Cub Cadet/Troy-Bilt ZTs and is easier to install than a rebuild. Skip it if you need an exact OEM fit for a rare model or want a plug-and-play harness—check your connector first.