The John Deere F510 deck belt part number found is M120048. The deck belt size found is 131 in (3,327 mm) long by 0.45 in (11 mm) wide. The drive belt part number found is M95121. The drive belt size found is 43.82 in (1,113 mm) long by 0.45 in (11 mm) wide.
John Deere F510 Belt Size and Part Numbers
| Mower deck belt part number | M120048 |
|---|---|
| Mower deck belt length | 131 in (3,327 mm) |
| Mower deck belt width | 0.45 in (11 mm) |
| Drive belt part number | M95121 |
| Drive belt length | 43.82 in (1,113 mm) |
| Drive belt width | 0.45 in (11 mm) |
Belt Size Comparison Chart
Belt length comparison
Belt width comparison
John Deere F510 Belt Notes
| Mower deck belt note | The John Deere F510 deck belt listing shows part number M120048, length 131 in (3,327 mm) and width 0.45 in (11 mm). Match the old belt, deck size and routing before spending money |
|---|---|
| Drive belt note | The John Deere F510 drive or transmission belt listing shows part number M95121, length 43.82 in (1,113 mm) and width 0.45 in (11 mm). Do not mix it up with the deck belt because the routing and job are different |
| Fitment note | Belts are cheap until you buy the wrong one twice. On the John Deere F510, confirm belt route, old belt label and OEM part number before ordering |
John Deere F510 Belt Size FAQ
Why can the correct John Deere F510 deck belt still slip?
The deck belt length found is 131 in (3,327 mm). Even with the right length, a weak idler spring, worn pulley groove or wrong belt path can make it slip. The part number and routing matter together
Can you replace the John Deere F510 belt with the same length but different width?
The deck belt width found is 0.45 in (11 mm). That is the common 1/2-inch belt width range. Still match the OEM number because the belt angle, fabric wrap and effective length can differ. A belt with the wrong top width can ride too high or too low in the pulley even if the length looks right
Why are there separate belt part numbers for the John Deere F510?
The captured values separate the belt jobs: deck belt part number M120048 and drive belt part number M95121. Treat each number as position-specific and confirm it against the parts diagram before ordering
Mistakes do happen. Belt specs can change by year, mower deck, pulley layout, serial range and regional parts catalog. Please check the operator manual, belt routing decal, old belt label and official John Deere parts catalog before ordering a replacement belt.
