ILONPA Flat Idler Pulley GY22172 GY20067 for John Deere D140 D102 D110 D125 D130 L120 L118 L100 L105 L110 L130 L108 14542GS L2048 L1742 (2 Pack)

What It Is

The ILONPA Flat Idler Pulley GY22172 GY20067 is a 2-pack replacement pulley that guides and tensions the drive belt on the mower deck of select John Deere lawn tractors. It’s used on 42-inch, 48-inch, and 54-inch decks where a flat (non-grooved) idler pulley is required.

Fitment & Compatibility

Before buying, confirm these three things:

• Model fit: Compatible with John Deere D100 series (D102, D105, D110, D125, D130, D140), L100 series (L100, L105, L108, L110, L118, L120, L130), plus 14542GS, L2048, and L1742. Does not fit every deck size within those models—check your deck’s OEM pulley part number.
• OEM cross-reference: Replaces John Deere parts GY22172 and GY20067 (also listed as GY22172-2, GY20067-2). If your original pulley has a different number, it likely won’t fit.
• Measurements: Pulley outer diameter is 4.0 inches, inner bearing bore is 5/8 inch, and the flat face width is about 0.75 inch. Measure your old pulley to verify.

Key Things to Know

• Quality vs. OEM: ILONPA is an aftermarket brand. Reviews note the bearings are sealed but may not last as long as OEM John Deere pulleys. Acceptable for light-to-medium use.
• Installation difficulty: Easy. Remove the belt, unbolt the old pulley (usually a 5/16″ or 3/8″ hex bolt), swap, and re-tension the belt. No special tools required.
• Common gotcha: The pulley is flat, not grooved. It presses against the flat side of the belt, not the V-side. Using it on a grooved pulley application will cause belt slip and rapid wear.
• 2-pack value: You get two pulleys for about the price of one OEM. Keep the spare for future replacement, but note that not all decks use two flat idlers—verify your deck layout.

Should You Buy It

Buy this if you need a budget-friendly replacement for a worn flat idler pulley on a compatible John Deere D100 or L100 series tractor and you’re comfortable with aftermarket parts. It’s a solid value for the price, especially if you plan to keep a spare. Skip it if you want OEM longevity or if your original pulley is grooved.