The John Deere G100 deck belt part number found is M118685. The deck belt size found is 120 in (3,047 mm) long by 0.35 in (9 mm) wide. The drive belt part number found is M136927. The drive belt size found is 95.5 in (2,426 mm) long by 0.5 in (13 mm) wide.
John Deere G100 Belt Size and Part Numbers
| Mower deck belt part number | M118685 |
|---|---|
| Mower deck belt length | 120 in (3,047 mm) |
| Mower deck belt width | 0.35 in (9 mm) |
| Drive belt part number | M136927 |
| Drive belt length | 95.5 in (2,426 mm) |
| Drive belt width | 0.5 in (13 mm) |
Belt Size Comparison Chart
Belt length comparison
Belt width comparison
John Deere G100 Belt Notes
| Mower deck belt note | The John Deere G100 deck belt listing shows part number M118685, length 120 in (3,047 mm) and width 0.35 in (9 mm). Use the listed value as a buying guide, not a blind substitute for the deck-specific parts diagram |
|---|---|
| Drive belt note | The John Deere G100 drive or transmission belt listing shows part number M136927, length 95.5 in (2,426 mm) and width 0.5 in (13 mm). This is separate from the mower deck belt |
| Fitment note | Belts are cheap until you buy the wrong one twice. On the John Deere G100, confirm belt route, old belt label and OEM part number before ordering |
John Deere G100 Belt Size FAQ
Why can the correct John Deere G100 deck belt still slip?
The deck belt length found is 120 in (3,047 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
Should you buy the John Deere G100 belt by length only?
No. The deck belt width found is 0.35 in (9 mm). That is a narrow belt, so do not casually swap in a 1/2-inch belt unless the parts diagram says it crosses over. Too-wide belts can ride high in the pulley. Use length, width and OEM part number together where possible
Why are there separate belt part numbers for the John Deere G100?
The captured values separate the belt jobs: deck belt part number M118685 and drive belt part number M136927. 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.
