The John Deere X166 deck belt part number found is M126536. The deck belt size found is 108 in (2,743 mm) long by 0.5 in (13 mm) wide. The drive belt part number found is GX20006.
John Deere X166 Belt Size and Part Numbers
| Mower deck belt part number | M126536 |
|---|---|
| Mower deck belt length | 108 in (2,743 mm) |
| Mower deck belt width | 0.5 in (13 mm) |
| Drive belt part number | GX20006 |
Belt Size Comparison Chart
Belt length comparison
Belt width comparison
John Deere X166 Belt Notes
| Mower deck belt note | The John Deere X166 deck belt listing shows part number M126536, length 108 in (2,743 mm) and width 0.5 in (13 mm). Confirm the belt against the deck tag, belt decal or parts diagram before ordering |
|---|---|
| Drive belt note | The John Deere X166 drive or transmission belt part number captured here is GX20006. Treat it as partial drive-belt data if no matching width or OEM part number is shown |
| Fitment note | The blunt rule with the John Deere X166: 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 X166 Belt Size FAQ
What should you watch when fitting a 108 in (2,743 mm) deck belt on the John Deere X166?
A 108 in (2,743 mm) deck belt leaves little room for sloppy routing. 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. Before blaming the new belt, compare the belt path to the routing decal and make sure it sits on the correct side of each.
Should you buy the John Deere X166 belt by length only?
No. 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. Use length, width and OEM part number together where possible
How do you avoid mixing up the John Deere X166 deck and drive belts?
Use the belt position first: deck belt part number M126536 and drive belt part number GX20006. 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 X166 drive belt part number enough to buy from?
The captured drive belt number is GX20006. That is useful for OEM lookup, but the drive belt length and width were not fully captured here. It is weak data for guessing an aftermarket belt by size alone
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.
