The John Deere 108 deck belt part number found is GY20570. The drive belt part number found is M800202. The drive belt size found is 95 in (2,413 mm) long by 0.5 in (13 mm) wide.
John Deere 108 Belt Size and Part Numbers
| Mower deck belt part number | GY20570 |
|---|---|
| Drive belt part number | M800202 |
| Drive belt length | 95 in (2,413 mm) |
| Drive belt width | 0.5 in (13 mm) |
Belt Size Comparison Chart
Belt length comparison
Belt width comparison
John Deere 108 Belt Notes
| Mower deck belt note | The John Deere 108 deck belt part number captured here is GY20570. Use the listed value as a buying guide, not a blind substitute for the deck-specific parts diagram |
|---|---|
| Drive belt note | The John Deere 108 drive or transmission belt listing shows part number M800202, length 95 in (2,413 mm) and width 0.5 in (13 mm). This is separate from the mower deck belt |
| Fitment note | The blunt rule with the John Deere 108: part number beats guesswork. If the belt is off by even a small amount, it can slip, squeal, jump pulleys or wear fast |
John Deere 108 Belt Size FAQ
What should you check when fitting a 95 in (2,413 mm) drive belt on the John Deere 108?
The drive belt length found is 95 in (2,413 mm). This is a longer mower belt run, so twist, idler alignment and the belt keeper positions matter. A belt can be the right length and still fail if it is routed wrong. Also check the idler spring and pulley grooves because drive belts can slip under load even when they look fine at idle
Can you replace the John Deere 108 belt with the same length but different width?
The drive 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
How do you avoid mixing up the John Deere 108 deck and drive belts?
Use the belt position first: deck belt part number GY20570 and drive belt part number M800202. A deck belt number does not automatically fit the drive system, even when an aftermarket listing makes the cross-reference look close
Is the captured John Deere 108 deck belt part number enough to buy from?
The captured deck belt number is GY20570. This number helps with OEM lookup, but the deck belt length and width were not fully captured here. Before buying aftermarket, confirm the exact deck or serial range
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.
