[Lifetime Warranty] 120-3335 Timing Belt - for 30-inch Deck Toro TimeMaster 21199HD 20199 20200 20975 20977 Exmark ECKA30 ECS180CKA30000 - Replaces 1203335 265-610 | 44" x 3/4"
120-3335 44-inch replacement timing belt for Toro TimeMaster and Exmark lawn mowers in branded packaging.
120-3335 timing belt specification chart showing 44-inch length and 3/4-inch width for Toro and Exmark mower decks.
120-3335 timing belt for Toro TimeMaster and Exmark mowers with compatibility chart and part number details.
120-3335 timing belt for Toro TimeMaster and Exmark mowers showing material construction and cross-section details.
120-3335 timing belt for Toro TimeMaster lawn mowers with symptom troubleshooting guide infographic.
BlueStars 120-3335 timing belt for Toro TimeMaster and Exmark mowers, showing performance comparison infographic.
120-3335 timing belt installation guide for Toro TimeMaster and Exmark mowers showing pulley inspection tips.
120-3335 timing belt for Toro TimeMaster and Exmark mowers with installation instructions infographic.
BlueStars 120-3335 timing belt for Toro TimeMaster and Exmark lawn mower decks.
120-3335 44-inch replacement timing belt for Toro TimeMaster and Exmark lawn mowers in branded packaging.
120-3335 timing belt specification chart showing 44-inch length and 3/4-inch width for Toro and Exmark mower decks.
120-3335 timing belt for Toro TimeMaster and Exmark mowers with compatibility chart and part number details.
120-3335 timing belt for Toro TimeMaster and Exmark mowers showing material construction and cross-section details.
120-3335 timing belt for Toro TimeMaster lawn mowers with symptom troubleshooting guide infographic.
BlueStars 120-3335 timing belt for Toro TimeMaster and Exmark mowers, showing performance comparison infographic.
120-3335 timing belt installation guide for Toro TimeMaster and Exmark mowers showing pulley inspection tips.
120-3335 timing belt for Toro TimeMaster and Exmark mowers with installation instructions infographic.
BlueStars 120-3335 timing belt for Toro TimeMaster and Exmark lawn mower decks.
Lifetime Warranty

[Lifetime Warranty] 120-3335 Timing Belt - for 30-inch Deck Toro TimeMaster 21199HD 20199 20200 20975 20977 Exmark ECKA30 ECS180CKA30000 - Replaces 1203335 265-610 | 44" x 3/4"

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120-3335 Timing Belt (44" x 3/4")

Key Features

  • Type: Timing Belt
  • Function: Synchronizes mower blades on 30-inch cutting decks
  • Belt Length: 44 inches
  • Belt Width: 3/4 inches
  • Construction: Built for durability and reliable power transmission

Replaces / Cross-Reference Part Numbers

  • 120-3335-SL
  • 1203335SL
  • 265-610
  • 15432
  • BT-0800
  • 504-00719
  • 810-CBL2401T

Compatibility & Fitment

  • Toro TimeMaster Models (30-inch Deck)
    • 20199, 20200, 20975, 20977, 20978, 21199, 21199HD, 21811
  • Exmark Models (30-inch Deck)
    • ECKA30, ECS180CKA30000

When to Replace

  • Visible signs of damage such as cracking, fraying, glazing, or missing teeth.
  • Noticeable decrease in cutting performance or uneven cut quality.
  • Audible slipping, squealing, or grinding noises from the deck during operation.
  • As part of scheduled maintenance according to the equipment's service manual.

Installation Tips

  • Always disconnect the spark plug before performing maintenance.
  • Refer to your mower's owner or service manual for detailed replacement instructions.
  • Verify correct belt routing and tension as specified by the manufacturer.
  • Inspect pulleys and tensioners for wear or damage before installing the new belt.
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  • PART NUMBERS

    PART NUMBERS

    This Deck Belt replaces part numbers: Toro 120-3335, 1203335; Exmark 120-3335
  • 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.
FIT MODELS

FIT MODELS

Toro: TimeMaster 30" Deck 20199, 20200, 20975, 20976, 20977, 20978, 21199, 21199HD, 21200, 21810, 21811, 22200, 22205TE, 22210 | Exmark: ECKA30, ECS180CKA30000 | Stens: 265-610

FAQ

This timing belt fits Toro TimeMaster 30-inch deck mowers and Exmark 30-inch deck units that use part 120-3335. Confirmed model references include Toro 20199, 20200, 20975, 20976, 20977, 20978, 21199, 21199HD, 21200, 21810, 21811, 22200, and 22205TE, plus Exmark ECKA30 and ECS180CKA30000. For Exmark applications, published references also note ECKA30 serial 313,000 and up and ECS180CKA30000 serial 315,000 and up. Always verify the belt number from your mower's parts lookup before ordering.
This belt replaces Toro/Exmark part number 120-3335. Common cross-references also include 1203335 and 265-610.
Common symptoms include the blades falling out of time, poor cut quality, uneven or ragged grass, belt slippage, visible cracking or missing cogs, squealing from the deck area, or a belt that has stretched enough to ride improperly on the pulleys. On synchronized 30-inch decks, a worn timing belt can also cause one blade to stop or lag relative to the other.
No. This is the deck timing belt, which synchronizes the two blades on the 30-inch deck. It is different from the main drive belt that transfers power from the engine to the deck. On these Toro TimeMaster and Exmark 30-inch machines, it is important to match the timing belt by part number rather than assuming all deck belts are the same.
For most owners, this is a moderate repair. Typical tools include socket and wrench sets, a screwdriver, and possibly pliers for covers or guards. Expect roughly 30 to 90 minutes depending on rust, access, and whether the deck must be partially disassembled. Because this is a timing belt, correct routing and blade synchronization are important during installation.
Inspect the deck pulleys, belt guides, spindle bearings, and covers for wear or damage. Remove packed grass and debris from the deck area, and make sure the pulleys spin smoothly without wobble. If the old belt failed from misalignment or a seized spindle, installing a new belt alone may lead to another early failure.