Mower Belt M154621 Deck Belt | Fits 42" Deck John Deere X300 X304 X310 Lawn Tractors, 48" Deck EZtrak | 146-1/4"
M154621 replacement mower belt in branded packaging for John Deere lawn tractors and zero-turn mowers.
M154621 mower deck belt for John Deere and EZtrak lawn tractors shown with a man operating a riding mower.
M154621 mower belt specifications chart showing 1/2 inch width and 146.24 inch length for John Deere lawn tractors.
M154621 replacement mower belt for John Deere X300, X304, X310, and Z245 lawn tractors with compatibility info graphic.
M154621 mower belt construction diagram showing aramid fiber cords, chloroprene rubber, and two-layer wrapping cover.
M154621 mower belt for John Deere lawn tractors with symptom troubleshooting guide.
M154621 mower belt installation guide infographic showing maintenance tips for pulley bearings, edges, grooves, and springs.
M154621 mower belt installation guide for John Deere lawn tractors and zero-turn mowers.
M154621 mower belt comparison chart highlighting performance benefits and durability features for John Deere lawn tractors.
M154621 replacement mower belt in branded packaging for John Deere lawn tractors and zero-turn mowers.
M154621 mower deck belt for John Deere and EZtrak lawn tractors shown with a man operating a riding mower.
M154621 mower belt specifications chart showing 1/2 inch width and 146.24 inch length for John Deere lawn tractors.
M154621 replacement mower belt for John Deere X300, X304, X310, and Z245 lawn tractors with compatibility info graphic.
M154621 mower belt construction diagram showing aramid fiber cords, chloroprene rubber, and two-layer wrapping cover.
M154621 mower belt for John Deere lawn tractors with symptom troubleshooting guide.
M154621 mower belt installation guide infographic showing maintenance tips for pulley bearings, edges, grooves, and springs.
M154621 mower belt installation guide for John Deere lawn tractors and zero-turn mowers.
M154621 mower belt comparison chart highlighting performance benefits and durability features for John Deere lawn tractors.
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M154621 Deck Belt | Fits 42" Deck John Deere X300 X304 X310 Lawn Tractors, 48" Deck EZtrak | 146-1/4"

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M154621 Mower Deck Belt | 146-1/4"

Key Features

  • Type: Mower Deck V-Belt
  • Width: 1/2 inch
  • Length: 146-1/4 inches
  • Material: Aramid fiber cord construction for high tensile strength and longevity.
  • Design: Wrapped exterior provides smooth engagement and resistance to heat, oil, and cracking.

Replaces / Cross-Reference Part Numbers

  • M154621
  • 265-316
  • 75-803
  • 175-803
  • 12560
  • B1JD173
  • 230-0316
  • 7-078299
  • 504-00326
  • 810-CBL2387T

Compatibility & Fitment

  • Brand: John Deere
  • Lawn Tractors with 42-inch Mower Decks:
    • X300
    • X304
    • X310
  • Zero-Turn Mowers with 48-inch Mower Decks:
    • Z245

When to Replace

  • Visible damage including cracking, fraying, glazing, or missing sections.
  • Audible squealing or slipping from the deck during operation.
  • Reduced cutting performance or uneven cutting results.
  • Belt has stretched and can no longer be properly tensioned.

Installation Tips

  • Disconnect the spark plug wire before starting any work for safety.
  • Verify the correct belt routing path using your mower's operator manual.
  • Inspect all pulleys and tensioners for wear, damage, or debris before installing the new belt.
  • Set the proper belt tension as specified by the manufacturer to ensure correct operation and prevent premature wear.
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  • PART NUMBERS

    PART NUMBERS

    This Deck Belt replaces part numbers: J-Deere M154621; Country Clipper D-3727, D-3727-W; Exmark 109-5364
  • SAVING SOLUTION

    SAVING SOLUTION

    Enjoy the great feeling when your mower is repaired and works like before - BlueStars brings DIY solutions to help you deal with any trouble
  • FIX MOWER'S SYMPTOMS

    FIX MOWER'S SYMPTOMS

    Uneven Grass Cutting, Loud or Unusual Noises, Excessive Vibration, Burning Smell, Slipping or Stalling Blades
  • IMPORTANT NOTE

    IMPORTANT NOTE

    This is a replacement part designed to be compatible with certain appliances. Any brand names mentioned are used solely to indicate compatibility.
CHECK BEFORE INSTALLING

CHECK BEFORE INSTALLING

Pulley Bearings: Make sure they spin freely, as damaged bearings can increase friction and wear; Pulleys Edges: Rust or sharp edges can cause belt damage; Pulley Grooves: Clean debris from the pulley grooves; Tensioner Spring: A weak spring can lead to belt slippage and increased friction
4 SIMPLE STEPS

4 SIMPLE STEPS

1. Remove the ignition key and spark plug wire(s) to prevent starting; 2. Disengage the blades, brackets, and blade cable to remove the deck; 3. Release the drive belt from idler pulleys, belt guides, and the transaxle pulley; 4. Reinstall with our new part. Check to ensure it's properly running.
#1 SOURCE OF HIGH-QUALITY REPLACEMENT PARTS

#1 SOURCE OF HIGH-QUALITY REPLACEMENT PARTS

Enjoy the comfort that our small yet mighty parts simplify your mowing experience
Brand Model Number
J-Deere X300, X304, X310 Lawn Tractors with 42" Mower Deck
J-Deere Z245 EZtrak Zero-Turn Mower with 48" Mower Deck
Exmark Quest Zero-Turn Mower Serial No. 670,000 and higher with 48" Deck
Country Clipper Jazee 42"-48" Series SR205, 210, 215 and 220; Jazee Pro 48" Series SR370; and Charger 48" SR1000 Zero-Turn Mowers

FAQ

This belt is designed for John Deere X300, X304, and X310 lawn tractors equipped with a 42-inch mower deck. It also fits the John Deere Z245 EZtrak zero-turn mower with a 48-inch deck (specifically for units produced before serial number 100,000).
This is a 1/2-inch wide V-belt with an outside circumference of 146-1/4 inches.
This belt replaces John Deere OEM part number M154621. It also cross-references with Oregon 175-803, Stens 265-316, and Exmark 109-5364.
You should inspect your belt if you notice fraying, cracking, or missing chunks along the edges. Other indicators include the mower deck failing to engage properly, the blades spinning slowly or losing power under load, or a noticeable squealing sound during operation.
Before installing the new belt, inspect all deck pulleys and the idler arm for smooth rotation. If a pulley bearing is seized or noisy, replace it immediately, as a bad pulley will quickly destroy a new belt. Ensure the belt is properly routed through all guides and tensioners according to your mower's deck diagram.
Replacing the deck belt is a standard maintenance task that typically takes 30 to 60 minutes. You will need basic hand tools to release the tension on the idler pulley. It is often easiest to remove the mower deck from the tractor to provide clear access to the pulleys, though some users can perform the replacement by carefully maneuvering the belt while the deck is still attached.