JOHN DEERE 42" 48" DECK MANDREL GY20050 L100 L107 L108 L110 GY20785 M155979

42-inch 48-inch Deck Mandrel for John Deere

This deck mandrel assembly, with OEM cross-reference numbers GY20050, GY20785, and M155979, drives the mower blades on select John Deere lawn tractors.

Overview

The deck mandrel is a critical component that transfers power from the drive belt to the mower blade, ensuring a clean and even cut. Designed for John Deere 42-inch and 48-inch deck configurations, it fits popular models like the L100, L107, L108, and L110. This durable replacement restores cutting performance and extends the life of your mower deck.

Built For Performance

• Precision-engineered to match OEM specifications for reliable operation
• Heavy-duty construction withstands the stress of continuous mowing
• Includes bearing and shaft assembly for smooth rotation
• Direct replacement for worn or failed original mandrels
• Tested for balanced blade engagement

Fits These Machines

• for John Deere L100
• for John Deere L107
• for John Deere L108
• for John Deere L110

On-The-Job Use

• Residential lawn mowing
• Replacing a worn or damaged deck spindle
• Maintaining a consistent cut height across the deck
• Restoring blade rotation on older John Deere tractors

Specs At A Glance

Good To Know

Q: Is this mandrel compatible with both 42-inch and 48-inch decks? A: Yes, it is designed to fit John Deere mower decks in both 42-inch and 48-inch configurations, but always verify your deck model and pulley size.

Q: Can I use this on a John Deere L series with a different deck size? A: This mandrel is specific to the 42-inch and 48-inch decks commonly found on L100, L107, L108, and L110 models; other deck sizes require a different part.

Slight variation in finish or dimensions may occur between production runs, and confirm compatibility before ordering.