2 Pack 756-04129B Idler Pulley Replaces 753-08171 753-08068 956-04129 Rotary 12675 for Cub Cadet 42" 50" RZT 50 LTX 1040 LT1045 LTX1050 RZT54 LTX1045 LT1500 RZT42 LT2000 Troy Bilt 42 Mowers

What It Is

This is a 2-pack of idler pulleys designed for the blade drive belt system on Cub Cadet, Troy-Bilt, and similar lawn tractors with 42", 50", or 54" cutting decks. They maintain tension and guide the belt that spins the blades.

Fitment & Compatibility

Before buying, confirm your mower’s deck size and model number. This pulley replaces OEM part numbers 756-04129B, 753-08171, 753-08068, and 956-04129. Fits many Cub Cadet models including RZT 50, LTX 1040, LT1045, LTX1050, RZT54, LTX1045, LT1500, RZT42, and LT2000, plus Troy-Bilt 42" models. Also compatible with Rotary 12675. Measure the pulley: it’s a 4.0" outer diameter with a 5/8" bore and a 3/8" bearing width. Check your existing pulley’s dimensions and bearing type (smooth vs. flanged) to ensure a match. If your mower uses a different bore size or offset, this won’t fit.

Key Things to Know

• Quality: Aftermarket replacement, not OEM. Users report it holds up well but bearings may wear faster than originals in heavy use.
• Installation: Easy if you have basic tools (socket wrench, pry bar). Remove belt tension, unbolt old pulley, swap in new one, and re-tension. No modifications needed.
• Common Gotcha: The included bolts may not match your mower’s thread pitch. Use your original hardware to avoid stripping.
• Pack Size: Two pulleys in one pack – handy if you need to replace both idlers or keep a spare.

Should You Buy It

Right for budget-conscious owners of compatible Cub Cadet or Troy-Bilt mowers who want a functional replacement without paying OEM prices. Not ideal if you need exact OEM specs or expect long-term durability under commercial use.