One of the most frequent maintenance tasks for lawn mowers is replacing worn or broken drive and deck belts. Choosing the correct replacement belt requires knowing the right belt width, length, and type (e.g., V‑belt, ribbed, flat). This post provides a complete guide on that.
Lawn Mower Belt Size Chart
| Brand | Model(s) | Belt Location | Width | Inner Length | Type | OEM/Alt Part Codes |
|---|---|---|---|---|---|---|
| Ariens | Edge 34, Zoom 34 | Deck Drive | 1/2″ | 94.5″ | V-belt | 07200037 |
| Ariens | Ikon XD 52 | Deck Drive | 1/2″ | 112.5″ | V-belt | 07200042 |
| AYP/Poulan | PB195H42LT, 42″ Deck | Deck Drive | 1/2″ | 95″ | V-belt | 532196857 |
| AYP/Poulan | PO17542LT, 42″ Deck | Deck Drive | 1/2″ | 92.5″ | V-belt | 532144200 |
| Bolens | 13AM761F, 38″ Deck | Deck Drive | 1/2″ | 89″ | V-belt | 754-04059 |
| Bolens | 13AN772G, 42″ Deck | Deck Drive | 1/2″ | 95.25″ | V-belt | 754-04045 |
| Briggs & Stratton | 38″ Deck, Select Models | Deck Drive | 1/2″ | 88.5″ | V-belt | 7101375YP |
| Briggs & Stratton | 50″ Deck, Select Models | Deck Drive | 1/2″ | 135″ | V-belt | 7102144YP |
| Colt/Rancher/Ranger | 10–14 HP, 42″ Deck | Deck Drive | 5/8″ | 90–95″ | V-belt | B65, AK70 |
| Craftsman | T1200, 42″ Deck | Deck Drive | 1/2″ | 95.5″ | V-belt | CMXGZAM501009 |
| Craftsman | T3100, 54″ Deck | Deck Drive | 1/2″ | 141″ | V-belt | CMXGZAM501010 |
| Cub Cadet | LTX 1050, 50″ Deck | Deck Drive | 1/2″ | 134.5″ | V-belt | 754-04240 |
| Cub Cadet | ZT2 60″ Zero-Turn | Deck Drive | 1/2″ | 145″ | V-belt | 754-05029 |
| Dixon | ZTR 427, 42″ Deck | Deck Drive | 1/2″ | 90″ | V-belt | 539125625 |
| Dixon | ZTR 5425, 54″ Deck | Deck Drive | 1/2″ | 140″ | V-belt | 539129628 |
| Husqvarna | YTH22V46, 46″ Deck | Deck Drive | 5/8″ | 104.5″ | V-belt | 532405143 |
| Husqvarna | Z254F, 54″ Deck Zero-Turn | Deck Drive | 1/2″ | 142″ | V-belt | 539112557 |
| John Deere | D140, 48″ Deck | Deck Drive | 5/8″ | 133.5″ | Ribbed | GX22036 |
| John Deere | X350, 42″ Deck | Deck Drive | 1/2″ | 102.5″ | V-belt | M154295 |
| McLane | 17″ Reel Mower | Drive Belt | 3/8″ | 21″ | V-belt | A16 |
| McLane | 25″ Reel Mower | Drive Belt | 1/2″ | 26″ | V-belt | A22 |
| MTD | 42″ Deck, 13A878XS | Deck Drive | 1/2″ | 96″ | V-belt | 754-05024 |
| MTD | 50″ Deck, 13BX915S | Deck Drive | 1/2″ | 134.25″ | V-belt | 754-05026 |
| Murray | 40″ Deck, Select Models | Deck Drive | 1/2″ | 90.5″ | V-belt | 37X89MA |
| Murray | 52″ Deck, Select Models | Deck Drive | 1/2″ | 141″ | V-belt | 7102145YP |
| Sears/Simpson | 46″ Deck, CMXGRAM1130042 | Deck Drive | 1/2″ | 104″ | V-belt | 532429637 |
| Snapper | 33″ Rear Engine Rider | Deck Drive | 1/2″ | 87.5″ | V-belt | 7022253YP |
| Snapper | ZTX150, 48″ Deck | Deck Drive | 1/2″ | 134″ | V-belt | 7102146YP |
| Toro | TimeCutter SS4225 | Deck Drive | 1/2″ | 112.5″ | V-belt | 120-3893 |
| Toro | Titan ZX4800, 48″ Deck | Deck Drive | 1/2″ | 133.5″ | V-belt | 120-3895 |
| Troy-Bilt | TB30R, 30″ Deck | Deck Drive | 1/2″ | 85″ | V-belt | 754-04249 |
| Troy-Bilt | Horse XP, 46″ Deck | Deck Drive | 1/2″ | 104″ | V-belt | 754-04044 |
| Various | Push Mower, 20–22″ | Drive Belt | 3/8″ | 30–34″ | 3L/4L | – |
| White Outdoor | ZT-5000, 50″ Deck | Deck Drive | 1/2″ | 134.5″ | V-belt | 754-04166 |
Related Lawn Mower Pulley Swap Chart(For All Brands + Models)
How to Measure & Identify Your Belt
When the belt code isn’t printed or legible, you’ll need these measurements:
- Width: top where it seats in the pulley
- Type: V-belt (A, B, C), ribbed (3V, 5V), flat
- Length: usually given as inside circumference, but can be measured as outer then adjusted
Belt Size Conversion Reference
| Section | Width (in) | Height (in) | Inner to Outer Δ |
|---|---|---|---|
| A | 1/2″ | 5/16″ | ~2″ |
| B | 21/32″ | 13/32″ | ~3″ |
| C | 7/8″ | 17/32″ | ~4″ |
| 3V | 3/8″ | 5/16″ | – |
| 5V | 5/8″ | 17/32″ | – |
Note: Tameson’s belt chart shows how to convert outer circumference to inner, e.g., subtract ~2″ for an A‑section belt.
Related Craftsman LT2000 Drive Belt Diagram(Fixed)
Replacing & Troubleshooting Tips
- Measure the old belt: width + outer length, then adjust using section Δ (see chart above).
- Check belt type: confirm groove shape matches pulleys (V vs ribbed vs multi‑rib).
- Test fit: after mounting, slide pulleys manually to check tension and alignment.
- Observe tensioner: ensure spring/idler pulley compresses ¼″–½”.
- Underload test: run the mower under normal deck height without load to prevent overstressing the new belt.
- Replace in matched sets: if a multi-banded belt is used, always replace all bands together.
Maintenance Checklist
- Inspect pulleys & deck if a belt breaks prematurely.
- Clean debris before installing a new belt.
- Tighten belt tension but don’t overtighten, belts should slip under extreme load.
- Oil idlers/pivots, but avoid belt surfaces.
- Keep manual or decals with belt codes for future use.
Related John Deere Belt Size Chart(For All JD Models)
FAQs
How to determine mower belt size?
To determine the correct mower belt size:
- Check the Manual: The most reliable source is your mower’s owner’s manual or a sticker/plate under the seat or hood.
- Look for Belt Code: Many belts have a code printed or embossed on them (e.g., A88, 5L1100).
- Measure the Old Belt (if it’s still usable):
- Length: Use a flexible tape or string to measure the belt’s full outer circumference.
- Width: Measure the top (flat) width of the belt.
- Type: Identify if it’s a V-belt (triangular cross-section), flat belt, or ribbed belt.
If the belt is broken, lay it flat and piece it together for measurement.
How to find V-belt size?
You can find a V-belt size using these methods:
- Section Width: Measure the top width of the belt (common sizes: 1/2″, 5/8″, 3/8″).
- Thickness: Measure the height of the belt’s profile.
- Length:
- Use a flexible measuring tape to find the outer length.
- Use belt measurement calculators or conversion charts to convert outer length to pitch length (centerline) or inner length.
Example: An A88 V-belt is an A-section belt (1/2″ wide) with an 88″ inner length.
Related Husqvarna Belt Size Chart(For All Models)
How long is a 42-inch mower belt?
A “42-inch mower belt” refers to the cutting deck size, not the belt’s length. For a 42″ mower deck:
- The belt length typically ranges from 92″ to 101″, depending on brand and deck configuration.
Common examples:
- John Deere 42” decks: ~104″ belt
- Cub Cadet 42” deck: around 96–98″
- Craftsman 42” deck: 95″–98″
Always check your exact model to avoid misfitting.
What are the different belts on a lawn mower?
Most lawn mowers have two to three types of belts:
- Deck Belt (Blade Belt): Connects the engine to the mower blades.
- Drive Belt: Transmits power from the engine to the transmission or wheels.
- Transmission Belt (Hydrostatic or Manual): Found in some riding mowers; helps engage gears or hydro drive.
Note: Zero-turn and multi-blade mowers may have more belts, often including idler belts and pump drive belts.
Related Cub Cadet Belt Size Chart(For All Models)
How can I know belt size?
To know your belt size:
- Use Part Number: Check under the hood, on the deck, or in the owner’s manual.
- Measure Manually:
- Use a string to trace the belt path and then measure the string.
- Measure width using calipers or a ruler.
- Use Online Lookup Tools: Many parts sites allow you to input your brand + model number to get the correct size.
How do I know what size my mower is?
“Mower size” can refer to a few things:
- Deck Size: Measure the width of the cutting area underneath (e.g., 42″, 48″, 54″).
- Engine Size: Usually measured in horsepower (e.g., 17.5 HP).
- Model Number: Found on a tag under the seat, hood, or on the frame. Use this to look up specifications online.
Knowing your deck size is important when buying blades and belts.
What is the standard V-belt size?
There is no single “standard” V-belt size, but V-belts are categorized by section codes (like A, B, C, etc.)
| Section | Top Width | Height | Common Use |
|---|---|---|---|
| A | 1/2″ | 5/16″ | Lawn mowers, small engines |
| B | 5/8″ | 13/32″ | Larger lawn tractors |
| 3L | 3/8″ | 7/32″ | Smaller mowers or pumps |
| 5L | 5/8″ | 3/8″ | Commercial equipment |
Example: An A88 belt is a 1/2″ wide belt with an 88-inch inner length.
