A wrong-size belt can lead to slipping, overheating, or even permanent damage to the transmission and deck. This comprehensive guide provides exact belt sizes for every Toro mower model.
Toro Belt Size Chart
Push Mowers
| Model | Drive Belt (inches) | Toro OEM Part |
|---|---|---|
| 20001 | 35 x 0.375 | 91-2258 |
| 20016 | 35 x 0.375 | 91-2258 |
| 20017 | 35 x 0.375 | 91-2258 |
| 20018 | 35 x 0.375 | 91-2258 |
| 20041 | 35 x 0.375 | 91-2258 |
| 20051 | 35 x 0.375 | 91-2258 |
| 20070 | 35 x 0.375 | 91-2258 |
| 20330 | 32.5 x 0.375 | 117-1018 |
| 20331 | 32.5 x 0.375 | 117-1018 |
| 20339 | 32.5 x 0.375 | 117-1018 |
| 20350 | 32.5 x 0.375 | 117-1018 |
| 20351 | 32.5 x 0.375 | 117-1018 |
| 20370 | 32.5 x 0.375 | 117-1018 |
| 20371 | 32.5 x 0.375 | 117-1018 |
| 20377 | 32.5 x 0.375 | 117-1018 |
| 20378 | 32.5 x 0.375 | 117-1018 |
| 20379 | 32.5 x 0.375 | 117-1018 |
| 20954 | 32.5 x 0.375 | 117-1018 |
| 20959 | 32.5 x 0.375 | 117-1018 |
| 20332 | 33.25 x 0.375 | 115-4669 |
| 20333 | 33.25 x 0.375 | 115-4669 |
| 20334 | 33.25 x 0.375 | 115-4669 |
| 20338 | 33.25 x 0.375 | 115-4669 |
| 20340 | 33.25 x 0.375 | 115-4669 |
| 20352 | 33.25 x 0.375 | 115-4669 |
| 20353 | 33.25 x 0.375 | 115-4669 |
| 20372 | 33.25 x 0.375 | 115-4669 |
| 20381 | 33.25 x 0.375 | 115-4669 |
| 20383 | 33.25 x 0.375 | 115-4669 |
| 21383 | 33.25 x 0.375 | 115-4669 |
| 21388 | 33.25 x 0.375 | 115-4669 |
| 21566 | 33.25 x 0.375 | 115-4669 |
| 21568 | 33.25 x 0.375 | 115-4669 |
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Riding Mowers
| Model | Deck Belt (inches) | Drive Belt (inches) | Part Number |
|---|---|---|---|
| 312-8 | 86 x 0.5 | – | 106-2708 |
| 520H | 92 x 0.5 | – | 106-2720 |
| LX500 | 90 x 0.5 | – | 112-0310 |
| GT2200 | 92.5 x 0.5 | – | 112-0308 |
| 13AX60RG744 | 90 x 0.5 | – | 112-0310 |
| 13AX60RH744 | 90 x 0.5 | – | 112-0310 |
| 14AK81TK744 | 95.5 x 0.5 | – | 112-0934 |
| 13BX60RG744 | 90 x 0.5 | – | 112-0310 |
Zero-Turn Mowers
| Model | Deck Belt (inches) | Drive Belt (inches) | Part Number |
|---|---|---|---|
| 75301 | 118.5 x 0.5 | 90.5 x 0.5 | 144-4620 |
| 75316 | 122 x 0.5 | 91.25 x 0.5 | 144-2579 |
| MX5000 | – | 64.5 x 0.5 | 130-6976 |
| MX5025 | – | 64.5 x 0.5 | 130-6976 |
| MX5050 | – | 64.5 x 0.5 | 130-6976 |
| MX5075 | – | 64.5 x 0.5 | 130-6976 |
| SS5000 | – | 64.5 x 0.5 | 130-6976 |
| SS5425 | – | 64.5 x 0.5 | 130-6976 |
| SW5000 | – | 64.5 x 0.5 | 130-6976 |
| SWX5000 | – | 64.5 x 0.5 | 130-6976 |
| SWX5050 | – | 64.5 x 0.5 | 130-6976 |
| ZS5000 | – | 64.5 x 0.5 | 130-6976 |
| SS4200 | 109.5 x 0.5 | – | 110-6774 |
| SS4235 | 109.5 x 0.5 | – | 110-6774 |
| SS4260 | 109.5 x 0.5 | – | 110-6774 |
| MX4260 | 114 x 0.5 | – | 110-6793 |
| MX5060 | 114 x 0.5 | – | 110-6793 |
| 75740 | 104.5 x 0.5 | – | 120-3892 |
| 75742 | 104.5 x 0.5 | – | 120-3892 |
| 75745 | 104.5 x 0.5 | – | 120-3892 |
| 75750 | 112 x 0.5 | – | 120-3894 |
| 75751 | 112 x 0.5 | – | 120-3894 |
| 75755 | 112 x 0.5 | – | 120-3894 |
| 75754 | 118 x 0.5 | – | 120-3896 |
| 75759 | 118 x 0.5 | – | 120-3896 |
| TimeCutter 50″ (2011-2017) | 112.5 x 0.5 | – | 110-6871 |
Related Husqvarna Belt Size Chart(For All Models)
Snowblowers
| Model | Traction Belt (inches) | Auger Belt (inches) | Part Number |
|---|---|---|---|
| 724 | 35 x 0.375 | – | 75-9010 |
| 726 | 35 x 0.375 | – | 75-9010 |
| 824 | 35 x 0.375 | 38 x 0.375 | 75-9010 (Traction), 75-9030 (Auger) |
| 826 | 35 x 0.375 | 38 x 0.375 | 75-9010 (Traction), 75-9030 (Auger) |
| 1028 | 35 x 0.375 | 38 x 0.375 | 75-9010 (Traction), 75-9030 (Auger) |
| 1332 | 35 x 0.375 | – | 75-9010 |
Other Equipment
| Model | Drive Belt (inches) | Part Number |
|---|---|---|
| Groundsmaster 120 | 42 x 0.5 | 66-3450 |
| Wheel Horse 520-H | 87 x 0.5 | 104-0875 |
| Wheel Horse 312-8 | 89 x 0.5 | 88-6250 |
Related Cub Cadet Belt Size Chart(For All Models)
How to Identify Your Toro Mower Model
Look for the model and serial number decal, typically located:
- Under the seat
- On the frame near the engine
- Inside the battery compartment
- Behind the deck chute
FAQ
How do I know what size drive belt I need?
To determine the correct drive belt size, follow these steps:
- Check your mower’s model number – It’s typically found on a decal under the seat or near the engine.
- Consult the owner’s manual – Toro manuals list the exact belt size and part number.
- Use a belt lookup tool – Toro’s official website or authorized parts dealers allow model-based belt searches.
- Measure the existing belt – If the original belt is intact, you can use a cloth measuring tape or string to measure its outer circumference.
Always match the belt length, width, and profile (V-belt, flat, or multi-rib) for the best fit.
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How to determine lawn mower belt size?
If you no longer have the manual or part number, use this method:
- Remove the old belt and lay it flat.
- Measure the entire outer circumference using a soft tape.
- Measure the width with a caliper or ruler.
- For broken belts, use a rope to trace the pulley path and then measure the rope.
Or, use this formula:
Belt length = (2 × center-to-center distance) + (1.57 × (pulley1 + pulley2))
What size belt is a Toro LX 420?
The Toro LX 420 typically uses:
- Deck belt: 42-inch deck models generally use a 1/2″ x 91.5″ belt
- Drive belt: 5/8″ x 90″ is common, but exact size may vary by year and serial number.
Always cross-reference the OEM part number: Toro OEM belts for the LX 420 deck are often listed as 112-0316.
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Why does my Toro mower keep breaking belts?
Frequent belt breakage could be due to:
- Incorrect belt size or type – Non-OEM belts may not align correctly.
- Worn or misaligned pulleys – Causes friction and premature wear.
- Deck obstructions – Sticks, rocks, or debris stress the belt.
- Tension issues – Over-tensioning or a faulty spring can lead to snapping.
- Heat and age – Belts degrade over time, especially under heavy use.
Tip: Regular inspections and cleaning prevent most belt failures.
What size belt is 42 inches?
A 42-inch deck doesn’t always use a 42-inch belt — that’s a common misconception.
For example:
- Toro 42” deck mowers usually require a belt that’s around 91–92 inches long and 1/2-inch wide.
- Always check your model’s specs, as deck width refers to cutting width, not belt length.
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How often should you replace your mower deck belt?
On average, a mower deck belt should be replaced:
- Every 2–3 mowing seasons, or
- After 100–150 hours of use,
- Immediately if there are signs of fraying, glazing, cracks, or slack.
Frequent mowing on uneven terrain or in hot conditions can shorten belt life. Regular maintenance extends its usability.
How long should a belt last on a lawn mower?
A good-quality mower belt (especially OEM) should last:
- 150–250 hours of operation, depending on usage and conditions.
- Light home use: 3–5 years.
- Commercial mowing: 1–2 seasons max.
Pro tip: Inspect the belt at the start and end of every season for wear or stretching.
Why does my new mower belt keep coming off?
If your new belt keeps slipping or coming off, possible causes include:
- Incorrect belt installation – Routed incorrectly around pulleys.
- Wrong belt size – Too long or narrow will not stay in place.
- Damaged tensioner or spring – Fails to maintain proper tension.
- Bent or worn pulleys – Misalignment forces the belt off.
- Improper pulley angle – Even a slight tilt can throw the belt off during mowing.
