Garden Parts [Lifetime Warranty] [Upgraded Grip120] GX21833 Mower Deck Belt - Fits 48 Inch Deck J-Deere 145 D140 D150 D155 D160 L120 L130 LA130 LA140 LA145 LA155 LA165 Z200 Z255 Z300 Z355E GX20571 | 1/2" x 141.7"
BlueStars GX21833 green mower deck belt in branded packaging for 48-inch lawn mower decks.
GX21833 mower deck belt specifications chart showing dimensions, 1/2 inch width, and 141.7 inch length.
Comparison graphic showing GX21833 mower deck belt grip and stability versus standard belts on a riding mower.
GX21833 mower deck belt performance infographic showing durability and bonding strength specifications.
Infographic showing 3-layer material construction of GX21833 mower deck belt with heat-resistant rubber and aramid cords.
GX21833 mower deck belt compatibility chart for John Deere 48-inch deck lawn tractors and zero-turn mowers.
Infographic guide for selecting the correct GX21833 mower deck belt for 48-inch John Deere cutting decks.
Infographic showing GX21833 mower deck belt and GX20006 drive belt compatibility for John Deere 48-inch mowers.
Infographic showing GX21833 mower deck belt installation on a John Deere lawn tractor to fix common mowing issues.
BlueStars GX21833 green mower deck belt in branded packaging for 48-inch lawn mower decks.
GX21833 mower deck belt specifications chart showing dimensions, 1/2 inch width, and 141.7 inch length.
Comparison graphic showing GX21833 mower deck belt grip and stability versus standard belts on a riding mower.
GX21833 mower deck belt performance infographic showing durability and bonding strength specifications.
Infographic showing 3-layer material construction of GX21833 mower deck belt with heat-resistant rubber and aramid cords.
GX21833 mower deck belt compatibility chart for John Deere 48-inch deck lawn tractors and zero-turn mowers.
Infographic guide for selecting the correct GX21833 mower deck belt for 48-inch John Deere cutting decks.
Infographic showing GX21833 mower deck belt and GX20006 drive belt compatibility for John Deere 48-inch mowers.
Infographic showing GX21833 mower deck belt installation on a John Deere lawn tractor to fix common mowing issues.
Lifetime Warranty

[Lifetime Warranty] [Upgraded Grip120] GX21833 Mower Deck Belt - Fits 48 Inch Deck J-Deere 145 D140 D150 D155 D160 L120 L130 LA130 LA140 LA145 LA155 LA165 Z200 Z255 Z300 Z355E GX20571 | 1/2" x 141.7"

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GX21833 Mower Deck Belt (1/2" x 141.7")

Key Features

  • Type: Mower Deck Drive Belt
  • Material: Reinforced rubber compound for enhanced durability
  • Width: 1/2 inch
  • Outside Circumference: 141.7 inches

Replaces / Cross-Reference Part Numbers

  • GX21833
  • GX20571
  • 265-238
  • 75-800
  • 175-800
  • B1JD92
  • 12461
  • 7-078277

Compatibility & Fitment

  • Deck Size: 48-inch mower decks
  • John Deere 100 Series Models: 145
  • John Deere D Series Models: D140, D150, D155, D160
  • John Deere L Series Models: L120, L130
  • John Deere LA Series Models: LA130, LA140, LA145, LA155, LA165
  • John Deere ZTrak Z Series Models: Z200, Z255, Z300, Z355E

When to Replace

  • Visible signs of wear, such as cracks, fraying, glazing, or abrasions.
  • Reduced cutting performance or uneven cut quality.
  • Audible squealing or slipping noises during mower deck operation.
  • Belt has become stretched, leading to improper blade speed.

Installation Tips

  • Disconnect the spark plug for safety before starting work.
  • Consult your owner's manual for the correct belt routing diagram.
  • Ensure all pulleys are clean, spin freely, and are free of debris.
  • Verify proper belt tension after installation as specified by the manufacturer.
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  • PART NUMBERS

    PART NUMBERS

    This Deck Belt replaces: J-Deere GX21833, GX20571; Ariens 07217400
  • 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 key & disconnect spark plug wire(s) to prevent start; let engine cool | 2. Raise & secure deck, remove belt covers | 3. Release tension, remove old belt (note/take photos of routing) | 4. Install new belt, rotate blades/spindle to check alignment & operation.
Brand Model Number
NOTE Please use "Ctrl + F" on desktop or the "Find in Page" function (via Rufus) on mobile to quickly check your compatible model. (This is not an exhaustive list. You can send us your appliance model and we will help you!)
John Deere 100 Series 145 with 48" Deck (Serial No. 150,001 -)
John Deere D100 Series D140 with 48" Deck (Serial No. A130,001 - or B020,001 -), D150 with 48" Deck, D155 with 48" Deck, D160 with 48" Lawn Tractors
John Deere L100 Series L120 with 48" Deck, L130 with 48" Deck
John Deere LA100 Series LA130 with 48" Deck, LA140 with 48" Deck, LA145 with 48" Deck, LA155 with 48" Deck, LA165 with 48" Deck Lawn Tractors
John Deere Zero-Turn Mowers (Z Series) Z255 with 48" Deck, Z355E with 48" Top Discharge Deck

FAQ

This belt is designed for John Deere riding mowers and zero-turn models equipped with a 48-inch mower deck. It is compatible with models including 145, D140, D150, D155, D160, L120, L130, LA130, LA140, LA145, LA155, LA165, Z255, and Z355E. Please confirm your specific mower model and deck configuration, and verify the belt part number before ordering.
This belt replaces John Deere OEM part numbers GX21833 and GX20571. If your equipment manual or parts list specifies these numbers for a 48-inch deck application, this belt is the correct replacement.
The belt measures 1/2 inch by 141.7 inches, with an effective length of 3599.4 mm (141.7 inches). While some specifications may list a width of approximately 0.559 inches due to variations in measurement methods or belt profiles, this belt is engineered to fit the 48-inch deck applications requiring part numbers GX21833 or GX20571.
Typical symptoms include the deck blades not engaging properly, weak or uneven cutting, belt squealing, visible cracking or glazing, frayed edges, or the belt repeatedly slipping off the pulleys. A stretched belt can also cause poor blade speed even if it is not broken.
For most compatible John Deere 48-inch decks, this is a moderate repair that can typically be completed in 30 to 60 minutes. Required tools include work gloves, a socket or wrench set, and a breaker bar or belt tool to relieve tension from the idler. Before removing the old belt, we recommend taking a photo of the routing or referencing the mower's deck belt routing decal.
Inspect the spindle pulleys, idler pulleys, belt keepers, tensioner arm, and deck bearings. A new belt can fail prematurely if a pulley is seized, misaligned, wobbling, or packed with debris. Additionally, clean built-up grass from the deck and ensure the belt is seated fully in every pulley groove before engaging the blades.
Common causes include normal wear, heat, debris buildup under the deck, pulley misalignment, weak tensioners, and worn spindle or idler bearings. Hitting branches or heavy material can also shock-load the belt. If the old belt burned, flipped, or came off repeatedly, inspect the deck hardware carefully rather than replacing only the belt.