756-05108 Idler Pulley Compatible with Cub Cadet MTD Troy-Bilt Craftsman 26SD710 ST200 ST100 262J709 WST Trimmer, Black

What It Is

This is an idler pulley (part #756-05108) that maintains tension on the mower deck drive belt. It’s designed for select Cub Cadet, MTD, Troy-Bilt, and Craftsman zero-turn mowers and walk-behind trimmers with 26SD710, ST200, ST100, 262J709, or WST engines.

Fitment & Compatibility

Before buying, verify three things:

• Deck size & model: Fits 42”–50” fabricated decks on Cub Cadet Z-Force, RZT, and LTX series, plus Troy-Bilt Mustang and Craftsman ZT models. Check your owner’s manual for “756-05108” or “Idler Pulley” in the parts diagram.
• Belt type: Works with 1/2” or 5/8” Kevlar/cogged belts. Measure your existing pulley’s outer diameter (3.5” typical) and bore size (usually 5/8” or 3/4”). The bore must match your spindle shaft.
• OEM vs. aftermarket: This is an aftermarket replacement for OEM part 756-05108. It’s not identical to 756-05109 or 756-05110 (different bore/diameter). If your original has a metal sleeve, this one uses a sealed bearing—same function, but verify clearance.

Key Things to Know

• Build quality: Sealed bearing reduces debris ingress, but the plastic pulley may wear faster than OEM metal on heavy-use machines (e.g., commercial mowing). Good for residential use.
• Installation difficulty: Easy—remove belt, unbolt old pulley (usually one 3/8” or 5/16” bolt), swap, and re-tension belt. No special tools needed. Takes 15–30 minutes.
• Common gotchas: The bolt hole spacing is 2.75” center-to-center—measure yours before buying. Some decks use a shoulder bolt; if your original bolt is shouldered, reuse it. Do not overtighten—torque to 15–20 ft-lbs max.
• Belt alignment: After install, spin the pulley by hand to check for wobble. If misaligned, the belt will squeal or throw off. Shim with washers if needed.

Should You Buy It

Buy this if you have a residential Cub Cadet, MTD, Troy-Bilt, or Craftsman with a 42”–50” deck and need a budget-friendly, direct-fit idler pulley for light-to-medium mowing. Skip it for commercial/heavy use or if you need a metal pulley for extreme heat or load conditions.