M158131 / M154296 Deck Belt for John Deere Z425, Z435 & Z445

Overview

This aftermarket mower deck belt replaces John Deere M158131 and M154296 on select John Deere Z425, Z435, and Z445 EZtrak zero-turn mowers equipped with the confirmed 48-inch or 54-inch mower deck path.

Do not order by the Z425, Z435, or Z445 model name alone. These mower families were available with different deck sizes and production configurations that may use another belt.

Key Features

• Aftermarket mower deck drive V-belt
• Primary Replacement Number: M158131
• Replaces Earlier John Deere Number: M154296
• Width: 1/2 inch
• Length: 152-1/4 inches
• Belt Type: mower deck drive V-belt
• Material: polyester-reinforced belt construction
• Package Quantity: 1 belt

Measurement note: Belt manufacturers may publish nominal, outside, or effective-length measurements differently. Match the original M158131 or M154296 part number first rather than ordering from a tape measurement alone.

Compatible John Deere Models & Deck Paths

This belt fits the following confirmed John Deere EZtrak mower paths:

• John Deere Z425 with 48-inch deck: serial number 100001 and higher
• John Deere Z425 with 54-inch deck: confirmed M158131 mower-belt path
• John Deere Z435 with 48-inch deck: confirmed M158131 mower-belt path
• John Deere Z435 with 54-inch deck: confirmed M158131 mower-belt path
• John Deere Z445 with 48-inch deck: serial number 100001 and higher
• John Deere Z445 with 54-inch deck: confirmed M158131 mower-belt path

Fitment note: Earlier Z425 and Z445 48-inch deck applications through serial number 100000 use the separate M158130 mower deck belt path.

Replaces OEM Part Numbers

• John Deere M158131
• John Deere M154296

Aftermarket Cross-Reference Numbers

• Stens: 265-567
• 8TEN: 810-CBL2218T

Important Fitment Check

Match the original mower deck belt number before ordering. This replacement is intended for mower deck configurations calling for John Deere M158131 or M154296.

Do not order from deck width alone. A 48-inch Z425 or Z445 may use either M158130 or M158131 depending on the mower serial number.

Common Symptoms of a Worn Deck Belt

• Blades turn slowly or lose speed in thick grass
• Deck belt squeals, slips, or produces a burning smell
• Belt repeatedly comes off the mower deck
• Visible cracking, glazing, fraying, or missing belt material
• Uneven belt tracking across the spindle or idler pulleys
• Blades engage but stop when the mower is placed under load

A damaged pulley, seized spindle bearing, weak tension spring, or incorrect belt routing can quickly damage a replacement belt. Inspect the complete deck-drive system before installation.

What’s Included

• 1 aftermarket mower deck drive belt

FAQ

Does M158131 replace M154296?

Yes. John Deere M158131 is the current replacement for M154296 on compatible mower deck applications.

What size is the replacement belt?

This aftermarket belt at approximately 1/2 inch wide and 152-1/4 inches long. Belt dimensions can vary depending on whether nominal, outside, or effective length is being published, so match the OEM number first.

Does M158131 fit every John Deere Z425?

No. The 54-inch Z425 deck uses the M158131 path. For 48-inch decks, serial number 100001 and higher uses M158131, while earlier 48-inch applications use M158130.

Does M158131 fit every John Deere Z445?

No. The 54-inch Z445 deck uses the M158131 path. For 48-inch decks, serial number 100001 and higher uses M158131, while earlier 48-inch applications use M158130.

Does this belt fit the John Deere Z435?

Yes. M158131 is a confirmed mower deck belt path for John Deere Z435 mowers equipped with compatible 48-inch or 54-inch mower decks.

Can I order this belt by deck width alone?

No. Match the mower model, deck size, serial number, and original belt number. Different John Deere decks with the same cutting width may use different belt lengths and routing.

Why does the replacement measurement differ slightly from the OEM measurement?

Belt suppliers may publish nominal width, effective length, or outside circumference. Small published differences are common. The primary fitment check is the confirmed M158131 or M154296 replacement number.

Related John Deere Deck Parts

• M158130 belt for earlier Z425 and Z445 48-inch decks
• 54-inch deck rebuild kit for John Deere Z425, Z435, and Z445
• John Deere Model Reference Quick Lookup Library
• Browse mower deck belts

Need Help Confirming Fitment?

Still not sure which deck belt fits your mower? Contact us for fitment help and send a clear picture of the mower identification tag or the original belt part number.