Xtreme PTO Clutch replacement for Cub Cadet & MTD — 1" bore, 6in pulley, weatherproof wiring

The Xtreme X0390 PTO clutch is a direct-fit aftermarket replacement PTO clutch with a 6-inch machined pulley, 1" bore, and integrated weatherproof wiring harness for select Cub Cadet, MTD and Troy-Bilt riding mowers.

If your mower’s PTO clutch is sticking, smoking, or no longer engaging the deck, the X0390 is built to match OEM dimensions while adding durable components like Cool Coil cooling technology, stainless fasteners and a replaceable pulley bearing. This clutch is designed for models that use a 1" shaft and a 6" pulley diameter with belt widths of 1/2" or 5/8", and it arrives with an impact- and water-resistant wire harness for easier connection to the mower’s wiring.

Which mower models will this clutch replace?

The X0390 is compatible with a range of Cub Cadet, MTD and related models that originally used part numbers listed below. Always verify your original part number and mower model before ordering to ensure fitment.

• Cub Cadet and MTD: FMZ50, LTX1042, LTX1045, LTX1046, LTX1050, RZT50, RZT54 and Z Force S series
• Troy-Bilt Mustang XP models from 2010–2012
• Replaces OEM numbers such as 717-04552 (and variants), 917-04552 series and Warner 5219-98

How does this clutch improve durability and performance?

Xtreme engineered the X0390 with components focused on longevity and smoother engagement. The pulley undergoes precision machining for balanced rotation, stainless rivets resist corrosion, and the clutch uses high-temperature grease in premium bearings to handle heat under load.

• Cool Coil technology to reduce operating temperature
• Replaceable pulley bearing for easier future service
• High-performance bearings pre-greased for high temperatures
• Stainless steel bands and rivets for corrosion resistance

What are the key dimensions and electrical details I need to know?

Confirming dimensions and rotation direction helps avoid fitment errors. The X0390 uses a 1" internal diameter (shaft bore), accepts a 1/2" or 5/8" belt, and turns counterclockwise when viewed from the pulley side. The clutch ships with an integrated clutch-side wiring harness that’s sealed against water and impact.

• Pulley diameter: 6" — matches many OEM replacements
• Shaft ID: 1" — standard for listed mower models
• Belt width compatibility: 1/2" or 5/8"
• Rotation: counterclockwise; includes watertight wiring harness

How easy is installation and what should I do to avoid premature failure?

Installation follows typical PTO clutch replacement steps but may require basic hand tools and belt tensioning. Xtreme includes an instruction sheet; following those guidelines and ensuring proper belt alignment, correct wiring connections, and clean mounting surfaces reduces the chance of early failure.

• Includes installation instructions—read before starting
• Use the correct belt width and tension for reliable engagement
• Inspect the mower’s wiring harness and connectors for damage
• Replace pulley bearing as needed to maintain balance and life

Who is this for: The Xtreme X0390 is aimed at homeowners, landscapers and repair shops looking for a robust, OEM-dimensioned PTO clutch to restore deck engagement on compatible Cub Cadet, MTD and Troy-Bilt tractors. Choose this part if your mower requires a 1" bore, 6" pulley, counterclockwise rotation and you value replaceable bearings, corrosion-resistant hardware, and a sealed wiring harness. Always verify the original OEM number and mower compatibility before purchase.