Caltric Deck Drive Belt Arm with Pulley Compatible with John Deere E150 E160 E170 441577 L120 407777 406577 445577 L130 LA130 LA140 LA145 LA155 LA165

What It Is

This is a replacement deck drive belt arm assembly with an integrated pulley, designed to route and tension the belt that powers the mower blades on select John Deere lawn tractors. It’s for riders with a 42-inch or 48-inch stamped steel deck (depending on model), typically used for residential mowing.

Fitment & Compatibility

• Check your deck size and model: Fits John Deere E150, E160, E170, L120, L130, LA130, LA140, LA145, LA155, LA165. Most of these use a 42-inch deck, but the L120 and L130 also come with a 48-inch option—verify your deck size before ordering.
• OEM part numbers: Replaces John Deere 441577, 407777, 406577, 445577. If your original has a different number (e.g., M156044), this Caltric arm may not match.
• Measurements: The pulley diameter is typically 4.0 inches, and the arm’s pivot hole center-to-center is about 4.5 inches. Measure your old arm’s dimensions to confirm.
• Belt not included: This is the arm and pulley only—you’ll need a separate drive belt (e.g., John Deere GX20072 or GY20578 for 42-inch decks).

Key Things to Know

• Quality concerns: The 3.2-star rating (only 4 reviews) suggests inconsistent fit or durability. Some users report the pulley bearing wears faster than OEM, so expect a shorter lifespan.
• Installation difficulty: Moderate. You’ll need to remove the deck, unbolt the old arm (usually two 3/8-inch bolts), and transfer the belt tension spring. A socket set and pry bar help.
• Common gotcha: The arm may not align perfectly with the deck’s belt guide. Check clearance before tightening—if the belt rubs, you’ll need to bend the guide slightly.
• No hardware included: You’ll reuse your original bolts and spring. Inspect them for rust or wear before reassembly.

Should You Buy It

Buy this if you’re on a tight budget and need a quick temporary fix for a worn deck arm pulley on an older John Deere rider. Skip it if you want long-term reliability or OEM fitment—the low rating and spotty reviews suggest it’s a gamble. For a few dollars more, an OEM arm (e.g., John Deere 441577) is safer for regular use.