Transmission Drive Pulley (MIU 800221 M811702 M809035) Fits John De ere D150 D120 L110 E180 X145 LA125 100 Series Lawn Tractors

What It Is

This is a replacement transmission drive pulley for John Deere 100 Series lawn tractors (D100–D180, L100–L130, X100–X145, and select LA models). It transfers power from the engine to the transmission via the drive belt, enabling forward/reverse movement.

Fitment & Compatibility

Before buying, verify three things:

• Model series – Fits John Deere D100/D110/D120/D130/D140/D150/D155/D160/D170/D180, L100/L105/L107/L110/L111/L118/L120/L130, X100/X105/X110/X115/X120/X125/X130/X140/X145, LA110/LA115/LA120/LA125/LA130/LA135/LA140/LA145/LA150/LA165/LA175.
• OEM part numbers – Replaces MIU 800221, M811702, M809035. Cross-check your existing pulley’s stamped number.
• Physical dimensions – 3.5” outer diameter, 5/8” bore, 1/2” belt width. Measure yours if possible; some 100 Series use a 3.75” or 4” pulley.

Not compatible with X300/500/700 series, older 300/400 series, or ZTrak zero-turns.

Key Things to Know

• Quality – Aftermarket, but zinc-plated steel with sealed bearings. Most users report it lasting 2–3 seasons with normal use.
• Installation difficulty – Moderate. You’ll need a socket set, a belt removal tool (or pry bar), and possibly a puller if the old pulley is seized. Plan 30–60 minutes.
• Common gotcha – The pulley set screw can loosen over time. Apply blue thread locker on installation. Also, check the drive belt condition; a worn belt will damage the new pulley quickly.
• Belt alignment – After installing, verify the pulley sits parallel to the engine pulley. Misalignment causes belt squeal and early wear.

Should You Buy It

Yes, if you have a compatible 100 Series John Deere and need a budget-friendly replacement for a worn or broken transmission pulley. The 4.6-star rating and 724 reviews confirm it’s a reliable drop-in fix for most owners. Avoid if you need an OEM part for warranty reasons or if your pulley has a different bore/belt width.