717-04174 PTO Clutch for MTD & Cub Cadet | Replaced by 917-04174

The 717-04174 PTO clutch is an original MTD OEM part number used on Cub Cadet, Troy-Bilt, Columbia, and other MTD-built riding mower platforms. This early version of the clutch was later updated with improved durability features, including thermal protection, and is now replaced by the 917-04174 PTO clutch, which serves as the current direct replacement.

If your mower blades are not engaging, slipping under load, or producing noise when the PTO is activated, a worn clutch is one of the most common causes. Replacing the clutch restores proper blade engagement and cutting performance while reducing the risk of overheating under heavy use.

Why 717-04174 Was Replaced

The 717-04174 part number represents an earlier generation PTO clutch design used on MTD platforms. Later revisions, including 717-04174A and 917-04174, introduced key reliability improvements such as upgraded bearings and a 370°F thermal auto cutoff.

This thermal protection feature helps prevent clutch failure caused by excessive heat buildup during prolonged mowing or heavy load conditions. As a result, newer replacement versions offer longer service life and more consistent engagement.

Today, 917-04174 serves as the standard replacement for all earlier versions, including both non-A and A revisions.

Replaces OEM Part Numbers

  • MTD: 717-04174, 717-04174A, 917-04174, 917-04174A
  • Other References: 746-04174, 746-04174A, 946-04174A
  • Replacement: 917-04174

746-04174 and 946-04174A PTO Clutch Variations

Part numbers such as 746-04174, 746-04174A, and 946-04174A are commonly found in MTD parts systems and may appear in parts diagrams for Cub Cadet, Troy-Bilt, and related platforms.

These numbers typically refer to the same PTO clutch platform as 717-04174, but may be listed under different system categories such as wiring assemblies, harness configurations, or updated parts catalogs.

Despite the different prefixes, these part numbers share the same core specifications, including 5.90-inch pulley diameter, 1-inch crankshaft bore, and CCW rotation.

If your mower references 746-04174, 746-04174A, or 946-04174A, the correct replacement is the 917-04174 PTO clutch.

Common Models Using 717-04174 PTO Clutch

The 717-04174 PTO clutch is most commonly found on early-generation MTD-built riding mowers produced before the “A” revision upgrade. These applications typically include 42" to 50" deck lawn tractors built in the early 2000s.

Common models include:

  • Cub Cadet: LT1042, LT1045 (early production models prior to thermal upgrade revisions)
  • Troy-Bilt: Big Red GT-50 (2002–2004)
  • Yard-Machines: 760F, 761G series lawn tractors
  • MTD-built platforms: Columbia, Yard-Man, Bolens, Huskee, and White Outdoor models using early PTO clutch configurations

These models were originally equipped with PTO clutches that often did not include a thermal cutoff, making them more susceptible to heat-related wear and failure over time.

The updated 917-04174 PTO clutch includes a 370°F thermal auto cutoff and upgraded internal components, making it the preferred replacement for both 717-04174 and 717-04174A applications.

For expanded model coverage and full cross-reference compatibility, refer to the 717-04174 PTO clutch fitment guide.

Common Signs of a Failing PTO Clutch

  • Blades will not engage when PTO switch is activated
  • Slipping or weak blade engagement under load
  • Grinding or squealing noise from clutch area
  • Burning smell or overheating
  • Blades stop in thicker grass

If these symptoms are present, replacing the PTO clutch will restore proper operation and help prevent further damage to the mower deck system.

How to Confirm Fitment

The most reliable way to confirm compatibility is to match the OEM part number stamped on your original clutch.

If the part number is unreadable or missing, you can also confirm fitment using your mower’s model and serial number. These can typically be found on a frame tag under the seat, near the engine, or on the mower deck.

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.

FAQ

Is 717-04174 the same as 917-04174?

Yes. 717-04174 is an earlier OEM part number that has been replaced by 917-04174. The newer version includes improved internal components and thermal protection while maintaining identical fitment.

What does the “A” mean in 717-04174A?

The “A” suffix indicates a revised version of the original clutch, typically adding features like improved bearings and a thermal auto cutoff. These versions are fully interchangeable.

Does 717-04174 have a thermal cutoff?

Most original 717-04174 units do not include thermal protection. The updated replacements, including 717-04174A and 917-04174, include a 370°F thermal cutoff to prevent overheating and extend clutch life.