GX20006 Lawn Mover Drive Belt 1/2" x 88.9" Replacement for John D-eere GX20006 105 115 125 135 145 D110 D120 D125 D130 D140 D150 with 42" and 48" Deck Murray 037X81MA 37X81 37X81MA

What It Is

This is a drive belt (1/2" wide x 88.9" long) that transfers power from the engine to the mower deck on select John Deere lawn tractors and Murray riding mowers. It’s designed for machines with 42-inch or 48-inch cutting decks.

Fitment & Compatibility

Check these before buying:

• Deck size: Fits John Deere 42” and 48” decks (models: 105, 115, 125, 135, 145, D110, D120, D125, D130, D140, D150) and Murray decks using OEM part numbers 037X81MA, 37X81, or 37X81MA.
• Measure your old belt: Confirm it’s exactly 1/2” wide and 88.9” long (roughly 88-7/8”). A mismatch can cause slipping or poor engagement.
• OEM vs aftermarket: This is an aftermarket replacement for John Deere GX20006 and Murray OEM belts. It’s not a genuine John Deere or Murray part, so verify your model’s original part number matches the listed cross-references.
• Deck type: Only for side-discharge or mulching 42”/48” decks—not for 54” decks or zero-turn mowers.

Key Things to Do

• Measure belt length carefully: Even a 1/8” difference can cause poor tension or premature wear. Use a tape measure, not just the part number.
• Check belt routing before removing the old one: Take a photo or draw a diagram. Routing errors are common with these decks.
• Inspect pulleys and tensioner: A worn or sticky tensioner can kill a new belt fast. Replace if the pulley spins rough or the spring is weak.
• Installation difficulty: Moderate—you’ll need basic tools (socket set, pry bar for tensioner). Expect 20–40 minutes if you’ve done it before.

Should You Buy It

Yes, if you need a budget-friendly replacement for a 42” or 48” deck John Deere or Murray and you’ve confirmed your model and belt measurements match. At ~$10 with solid reviews, it’s a good value for occasional use. Skip it if you need a genuine OEM belt for heavy commercial use or if your deck size is different.