The deck belt size found is 66 in (1,676 mm) long by 0.5 in (13 mm) wide.
John Deere LX178 Belt Size and Part Numbers
| Mower deck belt length | 66 in (1,676 mm) |
|---|---|
| Mower deck belt width | 0.5 in (13 mm) |
Belt Size Comparison Chart
Belt length comparison
Belt width comparison
John Deere LX178 Belt Notes
| Mower deck belt note | The John Deere LX178 deck belt measurement captured here is length 66 in (1,676 mm) and width 0.5 in (13 mm). Use the listed value as a buying guide, not a blind substitute for the deck-specific parts diagram |
|---|---|
| Fitment note | Belts are cheap until you buy the wrong one twice. On the John Deere LX178, confirm belt route, old belt label and OEM part number before ordering |
John Deere LX178 Belt Size FAQ
Why can the correct John Deere LX178 deck belt still slip?
The deck belt length found is 66 in (1,676 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 LX178 belt with the same length but different width?
The deck belt width found is 0.5 in (13 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
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.
