717-04174A PTO Clutch for Cub Cadet & MTD | Replaced by 917-04174
The 717-04174A PTO clutch is the revised MTD OEM version of the original 717-04174 used on Cub Cadet, Troy-Bilt, White Outdoor, and other MTD-built riding mower platforms. This updated version added improved durability features including a 370°F thermal auto cutoff and upgraded high-temperature bearings.
If your original clutch is marked 717-04174A, the correct replacement is the 917-04174 PTO clutch, which serves as the current direct replacement for both the original and revised versions.
For full model compatibility and related cross-reference numbers, see the 717-04174 PTO clutch fitment guide.
Why 717-04174A Was Introduced
The 717-04174A revision was introduced as an updated version of the earlier 717-04174 clutch platform. The main improvements were added thermal protection and upgraded bearing performance for better reliability under repeated PTO engagement and heavy mowing conditions.
These revisions did not change fitment. The pulley diameter, crankshaft bore, and rotation stayed the same, which makes the newer design fully backward compatible with earlier applications.
What the Thermal Cutoff Upgrade Changed
The most important improvement in the 717-04174A revision is the addition of a 370°F thermal auto cutoff. This feature helps protect the clutch coil from overheating by interrupting operation before excessive heat causes permanent damage.
For mower owners, this means improved durability, reduced risk of clutch failure under load, and more consistent blade engagement over time.
Replaces OEM Part Numbers
- MTD / Cub Cadet / Troy-Bilt: 717-04174A, 717-04174, 917-04174, 917-04174A
- Catalog / System References: 746-04174A, 746-04174, 946-04174A
- Replacement: 917-04174
Compatible Mower Platforms
This PTO clutch revision is commonly used on MTD-built riding mowers and lawn tractors across multiple brands, including:
- Cub Cadet: LTX1042, LTX1045, LTX1046, LTX1050, SLTX1050, i1042, i1046, i1050
- Troy-Bilt: TB2450 and related GT series tractors
- White Outdoor: GT-950H, LT-5000 and related lawn tractors
- Other MTD-built platforms: Columbia, Yard-Man, Yard Machines, Bolens, Huskee, and related applications using the same clutch specification
These applications typically use 42-inch to 54-inch mower decks depending on the model and production year.
Key Specifications
- Pulley Diameter: 5.90 inches
- Crankshaft Bore: 1 inch
- Rotation: CCW (counter-clockwise)
- Thermal Protection: 370°F automatic cutoff
- Operating Speed: Up to 3600 RPM
Common Signs of a Failing PTO Clutch
- Blades will not engage when the PTO switch is activated
- Weak or intermittent blade engagement
- Grinding or squealing noise from the clutch area
- Burning smell or excessive heat
- Blades stop under load in thicker grass
If these symptoms are present, replacing the clutch restores proper blade engagement and helps prevent further deck drive issues.
How to Confirm Fitment
The most reliable way to confirm compatibility is to match the OEM part number stamped on your original PTO clutch.
If the part number is unreadable or missing, you can also verify fitment using your mower model and serial number.
If your clutch is marked 717-04174A, 717-04174, or related variations in this group, the correct replacement is the 917-04174 PTO clutch.
FAQ
What did the “A” revision improve?
The 717-04174A revision added a 370°F thermal auto cutoff and improved bearing durability. These upgrades help protect the clutch from overheating and improve long-term reliability.
Can I use 717-04174A on a mower that originally had 717-04174?
Yes. The 717-04174A is fully backward compatible with original 717-04174 applications and is the preferred updated version of the same clutch platform.
Does 717-04174A fit 54” decks?
Yes. This clutch is commonly used on MTD-built platforms with 42-inch to 54-inch decks, depending on the mower model and configuration. Always verify by OEM part number or model and serial number.
Shop Replacement
Ready to replace your PTO clutch? Get the updated 917-04174 PTO clutch with built-in thermal protection for longer service life and reliable blade engagement.