John Deere M128733
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John Deere M128733 V-Belt Replacement Guide: Specs, Alternatives & Where to Buy
John Deere M128733 V-Belt Specs
If you’re replacing a mower deck belt on your John Deere lawn tractor, the part number M128733 is a common one—and choosing the right replacement is critical for smooth, long-lasting performance.
In this guide, we'll cover:
- M128733 belt specifications
- Compatible and upgraded replacement belts
- Trusted links to purchase online
What is the John Deere M128733 Belt?
The M128733 is a genuine OEM belt designed for use on John Deere 42-inch and 48-inch mower decks, especially on models in the LT, LA, and D series.
Specs at a Glance:
OEM Part #: M128733
Top Width: 1/2 inch (Classical A-section)
Outside Length: ~88.9 inches
Cord Material: Typically Kevlar for added strength
Application: Primary deck drive belt (PTO to deck spindles)
Best Replacement Options for M128733
If you're looking for a replacement belt—either OEM or aftermarket—here are the best options:
1. OEM John Deere M128733
Perfect fit and quality control from the original manufacturer.
2. Stens 265-768 (Kevlar Upgrade)
Kevlar-reinforced for superior durability and resistance to wear.
A direct-fit aftermarket alternative.
3. Rotary 13178
Built to meet or exceed OEM specs.
Ideal for budget-conscious users who still want reliable performance.
Common Models That Use M128733
This belt is commonly used on:
John Deere LA105, LA115, LA125, LA135
D110, D120, D130
LT150, LT160
And other 42”/48” deck models (always confirm in your manual)
Why Choose a Kevlar Belt?
Kevlar v-belts like the Stens 265-768 offer:
Higher heat resistance
Longer lifespan
Less stretching over time
They're ideal for demanding mowing conditions, especially with uneven terrain or heavy grass.
Replacing your John Deere M128733 belt doesn’t have to be complicated. Whether you choose OEM or an upgraded Kevlar option, the links above give you reliable choices from trusted brands like Stens and Rotary.
Need help confirming compatibility with your mower? Drop your model number in the comments or contact us for personalized assistance!
Application: Primary deck belt for many John Deere 42" and 48" decks (e.g., LT series, D100 series, LA series, etc.)
Top Width: 1/2 inch (Classical A-section)
Outside Length: Approx. 88.9 inches
Construction: Typically Kevlar-reinforced for longer life
Position: Often used as the deck drive belt (from PTO to deck spindle system)
