The drive belt part number found is M800100. The drive belt size found is 95 in (2,413 mm) long by 1 in (25 mm) wide.
John Deere 400 Belt Size and Part Numbers
| Drive belt part number | M800100 |
|---|---|
| Drive belt length | 95 in (2,413 mm) |
| Drive belt width | 1 in (25 mm) |
| Deck size | 48 in deck |
Belt Size Comparison Chart
Belt length comparison
Belt width comparison
Mower deck size comparison
John Deere 400 Belt Notes
| Drive belt note | The John Deere 400 drive or transmission belt listing shows part number M800100, length 95 in (2,413 mm) and width 1 in (25 mm). Do not mix it up with the deck belt because the routing and job are different |
|---|---|
| Deck size note | For the John Deere 400, deck size is listed as 48 in deck. Always match belt specs to the deck fitted to your machine, not just the tractor model name |
| Fitment note | Belts are cheap until you buy the wrong one twice. On the John Deere 400, confirm deck size, belt route and OEM part number before ordering |
John Deere 400 Belt Size FAQ
Why can the correct John Deere 400 drive belt still not pull properly?
The drive belt length found is 95 in (2,413 mm). If the tractor still slips, the belt may be routed wrong, the idler may be weak, or the pulley faces may be polished. Length alone does not fix a worn drive system
Should you buy the John Deere 400 belt by length only?
No. The drive belt width found is 1 in (25 mm). That is a heavy/wide belt size. Width matters here because a thinner substitute can lose grip, heat up or wear the pulley faces. Use length, width and OEM part number together where possible
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.
