M144570 Primary Belt for John Deere GT225, GT235, GT245, GX355, LX255, LX277, LX279 & X324

Overview

This M144570 primary belt replacement is built for select John Deere GT, LX, GX, and X300-series mower applications using the M144570 / M140502 belt path.

This belt is commonly associated with select John Deere GT225, GT235, GT235E, GT245, GX355, LX255, LX266, LX277, LX279, LX288, and X324 applications. Depending on the model, it may be used with 42-inch convertible, 42-inch Freedom, 42-inch mower deck, or 48-inch mower deck paths.

Important: This is a primary belt path, not a deck-size-only replacement. Match your original belt number first, then confirm belt width, belt length, mower model, deck size, attachment path, parts catalog path, and belt routing before ordering.

Key Features

• Replacement primary belt for select John Deere GT, LX, GX, and X324 applications
• Primary Part Number: M144570
• Also Replaces: M140502
• Quantity Included: 1 replacement primary belt
• Length: 97 inches
• Width: 1/2 inch
• Thickness: 0.3 inch
• Designed for mower belt systems using the listed OEM belt path
• Ships as one belt only

Compatible Brands & Model Series

This belt is intended for select John Deere mower and primary belt applications using the M144570 or M140502 replacement belt path.

Common supplier application paths include:

• John Deere GT Series: select GT225, GT235, GT235E, and GT245 applications
• John Deere GX Series: select GX355 applications
• John Deere LX Series: select LX255, LX266, LX277, LX279, and LX288 applications
• John Deere X324 Select Series: select X324 tractor applications with 42-inch convertible, 42-inch Freedom, 42-inch mower deck, and 48-inch mower deck paths
• John Deere X324 attachment paths: select X324 parts catalog paths also list related 44-inch front blade and 44-inch snowblower configurations

Catalog path note: Supplier data references John Deere parts catalog paths including PC2725 and PC9522. Use those as fitment clues only. Always confirm the belt number shown for your exact tractor, mower deck, or attachment setup.

Fitment note: Model names, deck sizes, and attachment paths are provided as fitment clues only. Always confirm your original belt number is M144570 or M140502, then verify belt size, mower model, deck size, attachment path, and routing before ordering.

Replaces Common Primary Belt Numbers

• John Deere: M144570, M140502

No-Dash Search Aliases

• M144570
• M140502

Belt Specifications

• Part Type: primary belt
• Primary Replacement Number: M144570
• Common Cross-Reference Number: M140502
• Length: 97 inches / 2463.8 mm
• Width: 1/2 inch / 12.7 mm
• Thickness: 0.3 inch / 8 mm
• Quantity Included: 1 replacement primary belt

Before Ordering

Before ordering this primary belt, confirm:

• Your original belt number matches M144570 or M140502
• Your mower uses this belt in the correct primary belt location
• Your mower deck or attachment uses the correct belt routing
• Your mower model, deck size, attachment path, and parts catalog path match the listed application
• Your idler pulleys, drive pulleys, spindle pulleys, belt guides, and tension spring are in good condition
• Your original belt length and width match the listed specifications

Do not install the belt until fitment is confirmed. Installed belts may not be eligible for return.

Common Symptoms of a Worn Primary Belt

• Primary belt slips under load
• Belt squeals when the mower deck or belt drive is engaged
• Mower leaves uneven or uncut grass
• Belt jumps off the pulley system
• Visible cracking, glazing, or fraying
• Deck vibration or poor blade speed
• Burning rubber smell near the mower belt drive system

Installation Notes

• Park the mower on a level surface and disconnect the spark plug before working on the deck or belt drive
• Take a photo of the belt routing before removing the old belt
• Confirm this is the primary belt path before installing
• Inspect idler pulleys, drive pulleys, spindle pulleys, belt keepers, and the tension spring before installing the new belt
• Make sure the belt is seated fully in each pulley groove
• After installation, test the mower at low speed and listen for belt tracking issues, squealing, or vibration

Why Buy From PTO Direct USA?

• Fast USA shipping
• Fitment-first product descriptions
• Clear part-number routing for John Deere mower belt repairs
• Deck parts organized by belts, blades, spindles, pulleys, and rebuild kits
• Support for homeowners, repair shops, and mower owners

Need Help Confirming Fitment?

If you are unsure whether this belt fits your mower, send us your mower model number, deck size, attachment setup, original belt number, and photos of your belt routing diagram, mower ID tag, and old belt before ordering.

FAQ

What does this primary belt replace?

This belt replaces M144570 and M140502 on select John Deere mower and primary belt applications.

What size is this belt?

This belt is listed at 97 inches long, 1/2 inch wide, and 0.3 inch thick. Always compare the belt size and routing to your original belt before ordering.

Does this belt fit John Deere GT225, GT235, or GT245 models?

This belt is commonly listed for select John Deere GT225, GT235, GT235E, and GT245 applications using the M144570 / M140502 primary belt path. Confirm your original belt number and routing before ordering.

Does this belt fit John Deere LX255, LX266, LX277, LX279, or LX288 models?

This belt is commonly listed for select John Deere LX255, LX266, LX277, LX279, and LX288 applications using the same primary belt path. Confirm your mower model, deck setup, and original belt number before ordering.

Does this belt fit John Deere X324 Select Series tractors?

This belt is commonly listed for select John Deere X324 Select Series applications with 42-inch convertible, 42-inch Freedom, 42-inch mower deck, and 48-inch mower deck paths. Confirm your parts catalog path and belt routing before ordering.

Can I order this belt by deck size only?

No. Deck size is only a starting point. Match the original belt number, belt size, mower model, deck or attachment path, parts catalog path, and belt routing before ordering.

Why does my primary belt keep coming off?

A primary belt may come off because of worn idler pulleys, bad bearings, weak tension springs, bent belt guides, incorrect routing, or the wrong belt size. Inspect the full belt drive system before installing a new belt.

Need other deck parts for this setup? Browse mower blades, spindle assemblies, deck pulleys and idlers, and deck rebuild kits.

Need a different belt? Browse the full mower deck belts collection.