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

What It Is

This is a 2-pack of GY22172 idler pulleys plus one GY20629 idler pulley—three pulleys total—designed for the belt-driven mower decks on select John Deere lawn tractors. They guide and tension the drive belt on 42-inch, 48-inch, and 54-inch decks, keeping the blades engaged smoothly.

Fitment & Compatibility

Before buying, confirm your tractor model and deck size. This set fits John Deere D140, D155, D160, E140, E160, E170, L120, L130, LA145, LA165, S140, S160, and S170 tractors. It replaces OEM part numbers AUC17621, GY22082, GY20067, and GY20110. Measure the pulley diameter (typically 3.5 inches) and shaft bore (usually 5/8 inch) to match your existing pulleys. Check your deck’s belt routing diagram—some decks use two GY22172 pulleys and one GY20629, others may vary. If your model isn’t listed, cross-reference your OEM part number.

Key Things to Know

• Quality: These are aftermarket pulleys with sealed bearings. They’re comparable to OEM for durability but cost significantly less. Some users report slightly noisier operation than OEM.
• Installation difficulty: Easy to moderate. You’ll need a socket wrench and possibly a puller if the old pulley is seized. No special tools required beyond standard hand tools.
• Common gotchas: The GY20629 pulley is flanged; the GY22172 pulleys are not. Mixing them up can cause belt misalignment. Also, check your belt condition—worn belts can damage new pulleys quickly.
• Pack contents: You get two GY22172 pulleys and one GY20629 pulley. Some decks need only two pulleys total, so verify your deck’s configuration before ordering.

Should You Buy It

Buy this if you need to replace worn or noisy idler pulleys on a compatible John Deere tractor and want a cost-effective alternative to OEM parts. It’s a solid value for the price, especially if you’re doing a full pulley refresh. Skip it if you prefer exact OEM fitment or need pulleys for a non-listed model.