2 Pack GY22172 Idler Pulley Replaces GY20067 Idler Pulley for John Deere 42" 48" D140 LA145 L130 L120 L110 LA115 E140 D110 E170 D160 LA105 D130 L100 D105 LA130 E160 Lawn Decks

What It Is

This 2-pack of GY22172 idler pulleys replaces OEM part GY20067 for John Deere lawn tractors. The pulley guides the drive belt on the mower deck, maintaining tension so the blades spin properly. Designed for 42" and 48" decks on select models.

Fitment & Compatibility

• Check your deck size: Fits 42" and 48" decks (not 54").
• Compatible models: D100, D105, D110, D130, D140, D160, D170, E140, E160, E170, L100, L105, L110, L120, L130, LA105, LA115, LA130, LA145. Also fits select X300 series and older 100-series tractors.
• OEM cross-reference: Replaces John Deere GY22172 and GY20067. Verify your old pulley part number before ordering.
• Measurements: Outer diameter ~4 inches, inner bearing bore ~5/8 inch, overall height ~1.25 inches. Measure your current pulley to confirm.
• Not for: Zero-turn mowers or decks with different belt routing (e.g., 54" decks, 60" decks).

Key Things to Know

• Quality: Aftermarket part with sealed ball bearings; generally holds up well for residential use. Not as durable as OEM for heavy commercial duty.
• Installation difficulty: Easy—remove belt, unbolt old pulley, bolt on new one. You’ll need a socket wrench and possibly a breaker bar if rusted.
• Common gotcha: The bolt may be reverse-threaded on some decks. Check before forcing. Also, inspect the belt and other idler pulleys while you’re in there.
• Value: Two pulleys for ~$20 is roughly half the cost of a single OEM pulley. Good for preventative replacement.

Should You Buy It

If you own a compatible John Deere lawn tractor with a 42" or 48" deck and need a budget-friendly idler pulley replacement for residential mowing, this 2-pack is a solid choice. Skip it if you’re running a commercial operation or need OEM-grade durability for heavy daily use.