2-Pack 756-05034A Idler Pulley for Joh-n Deere 100 & S100-S130 42" and 48" Decks MTD Cub Cadet XT1-LT42 XT1-LT46 Troy Bilt, Replace 34-109 280-242 756-05034A GY20629

What It Is

This is a 2-pack of idler pulleys designed to guide and tension the drive belt on 42-inch and 48-inch mower decks. Used on John Deere 100 and S100-S130 series, plus MTD/Cub Cadet XT1-LT42 and XT1-LT46 models.

Fitment & Compatibility

Before buying, confirm these three things:

• Deck size: Fits 42" and 48" decks only. Will not work on 54" or other sizes.
• Model series: Compatible with John Deere 100, S100, S110, S120, S130; Cub Cadet XT1-LT42, XT1-LT46; Troy Bilt and MTD equivalents. Verify your exact model number on the deck or under the seat.
• OEM cross-reference: Replaces OEM part numbers 34-109, 280-242, 756-05034A, and GY20629. If your pulley has a different stamped number, measure the outer diameter (3.5") and shaft bore (0.5") to confirm.

Key Things to Know

• Quality: Aftermarket pulleys (like this one) often use sealed bearings—less prone to failure than open bearings found on some OEM pulleys.
• Installation: Moderate difficulty. Requires removing the deck, loosening belt tension, and swapping the pulley. Expect 20–40 minutes per pulley.
• Common gotcha: The pulley bolt is reverse-thread on some models (lefty-tighty, righty-loosey). Check before you strip the head.
• Two-pack value: Cheaper per pulley than buying singles. Keep the spare for the other idler or as a backup.

Should You Buy It

If you’re maintaining a John Deere 100/S100 series or Cub Cadet XT1 with a 42" or 48" deck, this is a solid, affordable replacement. The sealed bearings and two-pack price make it a better value than OEM singles, especially if both idlers are worn or you want a spare on hand.