GELASKA 2 Pack GY22172 Idler Pulley with GY20629 Idler Pulley Replaces AUC17621 GY22082 GY20067 GY20110 for John Deere D140 D155 D160 E140 E150 E160 E170 L120 L130 LA145 LA165 S140 S160 S170 Decks

What It Is

This is a 2-pack of replacement idler pulleys (part numbers GY22172 and GY20629) for John Deere lawn tractor decks. They guide and tension the drive belt on 42-inch, 48-inch, and 54-inch Edge, Accel Deep, and standard cutting decks used on select D100, E100, L100, and S100 series tractors.

Fitment & Compatibility

Before buying, verify your tractor’s deck part number (stamped on top of the deck housing) and OEM pulley numbers. This set replaces John Deere parts GY22172, GY20629, AUC17621, GY22082, GY20067, and GY20110. It fits models like D140, D155, D160, E140, E150, E160, E170, L120, L130, LA145, LA165, S140, S160, and S170—but only with 42-inch, 48-inch, or 54-inch decks. Measure your pulley outer diameter: the GY22172 is typically 3.5 inches, the GY20629 is 4.0 inches. If your stock pulley is a different size, this set won’t work.

Key Things to Know

• Quality: These are aftermarket steel pulleys with sealed ball bearings. They match OEM dimensions but may not have the same bearing grease longevity as John Deere originals. Expect 2–3 seasons of typical residential use.
• Installation: Moderate difficulty. You’ll need a socket set and a pry bar to release belt tension. No special tools required, but you must remove the deck from the tractor for access.
• Common gotchas: The pulleys come as a pair; you can’t buy them individually. Also, check your belt condition—worn pulleys often damage belts, so replace both at the same time. The included bolts may be slightly shorter than OEM; reuse your original hardware if possible.
• Noise: Some users report a brief break-in whine that fades after 15–20 minutes of use. If noise persists, check belt tension and pulley alignment.

Should You Buy It

Buy this if you need a budget-friendly, functional replacement for a worn idler pulley on a compatible John Deere lawn tractor deck. It’s a solid value for residential mowing, but if you have a heavy commercial use or need exact OEM fitment, stick with genuine John Deere parts.