The John Deere 300 deck belt part number found is M144202. The deck belt length found is 146.25 in (3,715 mm). The drive belt part number found is M144044. The drive belt size found is 92 in (2,337 mm) long by 0.5 in (13 mm) wide.
John Deere 300 Belt Size and Part Numbers
| Mower deck belt part number | M144202 |
|---|---|
| Mower deck belt length | 146.25 in (3,715 mm) |
| Drive belt part number | M144044 |
| Drive belt length | 92 in (2,337 mm) |
| Drive belt width | 0.5 in (13 mm) |
Belt Size Comparison Chart
Belt length comparison
Belt width comparison
John Deere 300 Belt Notes
| Mower deck belt note | The John Deere 300 deck belt listing shows part number M144202 with length 146.25 in (3,715 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 300 drive or transmission belt listing shows part number M144044, length 92 in (2,337 mm) and width 0.5 in (13 mm). This is separate from the mower deck belt |
| Fitment note | For the John Deere 300, use the listed specs as a buying guide, but confirm against the operator manual, parts diagram or belt label before spending money |
John Deere 300 Belt Size FAQ
What should you watch when fitting a 146.25 in (3,715 mm) deck belt on the John Deere 300?
A 146.25 in (3,715 mm) deck belt leaves little room for sloppy routing. This is a very long belt run, so pulley alignment, belt keepers and idler tension matter a lot. Long belts punish sloppy routing fast. Before blaming the new belt, compare the belt path to the routing decal and make sure it sits on the correct side of each keeper
Can you replace the John Deere 300 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
Why are there separate belt part numbers for the John Deere 300?
The captured values separate the belt jobs: deck belt part number M144202 and drive belt part number M144044. Treat each number as position-specific and confirm it against the parts diagram before ordering
What should you double-check with the John Deere 300 deck belt part number?
The captured deck belt number is M144202. Because the width is missing here, check the old belt label, deck tag or parts diagram before trusting a non-OEM cross-reference
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.
