[Grip120] 109-3661 Deck Belt | Fits 52" Deck Toro TimeCutter MX6050 75760, Exmark Quest 74777, Titan Z5200 | 154"
109-3661 green replacement deck belt for Toro and Exmark zero turn mowers in branded retail packaging.
Specification chart for 109-3661 lawn mower deck belt showing 1/2 inch width and 154 inch outer length.
Comparison graphic showing BlueStars mower belt with 120% grip versus standard belts prone to tearing and slipping.
BlueStars 109-3661 lawn mower belt performance comparison infographic highlighting 120-hour fatigue life and bonding strength
Infographic showing 3-layer material construction of a green replacement V-belt with Grip120 cover and aramid cords.
Green replacement mower deck belt 109-3661 for Toro and Exmark zero turn mowers.
Instructional guide for identifying 109-3661 lawn mower deck belt compatibility and part number location.
Infographic showing 109-3661 lawn mower deck belt compatibility chart for Toro and Exmark models.
Green deck belt for Toro TimeCutter mower showing installation point to fix blade performance issues.
Replacement mower deck belt with easy-to-follow installation instructions for a zero-turn lawn mower.
109-3661 green replacement deck belt for Toro and Exmark zero turn mowers in branded retail packaging.
Specification chart for 109-3661 lawn mower deck belt showing 1/2 inch width and 154 inch outer length.
Comparison graphic showing BlueStars mower belt with 120% grip versus standard belts prone to tearing and slipping.
BlueStars 109-3661 lawn mower belt performance comparison infographic highlighting 120-hour fatigue life and bonding strength
Infographic showing 3-layer material construction of a green replacement V-belt with Grip120 cover and aramid cords.
Green replacement mower deck belt 109-3661 for Toro and Exmark zero turn mowers.
Instructional guide for identifying 109-3661 lawn mower deck belt compatibility and part number location.
Infographic showing 109-3661 lawn mower deck belt compatibility chart for Toro and Exmark models.
Green deck belt for Toro TimeCutter mower showing installation point to fix blade performance issues.
Replacement mower deck belt with easy-to-follow installation instructions for a zero-turn lawn mower.
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[Grip120] 109-3661 Deck Belt | Fits 52" Deck Toro TimeCutter MX6050 75760, Exmark Quest 74777, Titan Z5200 | 154"

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109-3661 Deck Belt | 154"

Key Features

  • High-strength aramid cord construction for heavy-duty torque requirements.
  • Heat-resistant and oil-resistant exterior wrapping for extended operational life.
  • Wrapped-style design reduces friction and heat buildup during high-speed engagement.
  • Dimensional specifications: 1/2 inch width by 154 inch effective length.

Replaces / Cross-Reference Part Numbers

  • 109-3661
  • 1093661
  • 109-3661-SL
  • 265-432
  • 810-CBL2442T

Compatibility & Fitment

  • Designed for 52-inch mower decks.
  • Fits Toro TimeCutter series: MX6050, 75760, 6000.
  • Fits Exmark Quest series: 74777.
  • Fits Toro Titan series: Z5200.

When to Replace

  • Inspect for signs of fraying, cracking, or glazing on the inner V-groove surface.
  • Replace if the belt exhibits stretching that prevents proper tension adjustment.
  • Change if you notice excessive slippage, squealing during engagement, or inconsistent cut quality.
  • Replace if sections of the outer cover are missing or if the internal cords are visible.

Installation Tips

  • Disengage the mower deck and remove the ignition key before service.
  • Clean debris from the deck pulleys and spindle covers prior to removing the old belt.
  • Consult the operator manual for the specific belt routing diagram to ensure correct alignment.
  • Release tension on the idler pulley assembly to facilitate removal and installation.
  • Verify that the belt is fully seated in all pulley grooves before applying final tension.
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  • PART NUMBERS

    PART NUMBERS

    This Deck Belt replaces: Toro 109-3661, Exmark 109-3661-SL.
  • 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 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!)
Toro TimeCutter 60 Inch Deck TimeCutter MX6050 (74777), TimeCutter 6000 (75760), TimeCutter Havoc MyRIDE (75763), TimeCutter (75762)
Toro Titan Z5200 52 Inch Deck Titan Z5200 (74814, 74815, 74818)
Exmark Quest 52 Inch Deck QST20BE422 SN: 790000 - 919999, QST22BE482 SN: 670000 - 919999, QST23KC482 SN: 720000 - 789999, QST23KC522 SN: 720000 - 789999, QST24BE522C SN: 790000 - 919999
Exmark Quest SP QST22BE482C SN: 790000 - 919999, QST24BE522 SN: 670000 - 919999
Exmark Quest 60 Inch Deck QTS708GEM60200 SN: 400000000 - 402082299, QZS708GEM60200 SN: 402082300 - 406294344

FAQ

This belt is designed for several Toro and Exmark zero-turn mowers, including the Toro TimeCutter MX6050 (74777), TimeCutter 6000 (75760), TimeCutter Havoc MyRIDE (75763), TimeCutter 75762, and the Titan Z5200. It is also compatible with the Exmark Quest series (74777).
Yes, this belt replaces OEM part number 109-3661 and 109-3661-SL. It also cross-references with Stens part number 265-432.
This is a 1/2-inch wide belt with an outside length of 154 inches.
You should inspect your belt if you notice uneven cutting, excessive vibration while the blades are engaged, or if the mower deck is struggling to reach full speed. Visible signs of wear include fraying, cracking, glazing on the sides of the belt, or if the belt has stretched to the point where the tensioner can no longer keep it tight.
Before installing the new belt, inspect your deck pulleys and the tensioner arm for smooth rotation. If a pulley bearing is seized or rough, it will quickly destroy your new belt. Also, ensure the deck is free of debris and grass buildup, as this can cause the belt to slip or run hotter than intended.
Replacing the belt is a standard maintenance task that typically takes 30 to 60 minutes. You will generally need basic hand tools, such as a socket set or a wrench to release tension on the idler pulley. It is helpful to have a diagram of the belt routing handy, which is usually located on a decal on the top of your mower deck.