Caltric Drive Belt Compatible with John Deere 325 335 345 355D Serial Numbers Above 070000+ / M131808

What It Is

This Caltric drive belt transmits engine power to the mower deck and wheels on select John Deere lawn and garden tractors. It’s designed as a direct replacement for the OEM M131808 belt, fitting models 325, 335, 345, and 355D with serial numbers above 070000.

Fitment & Compatibility

Before buying, confirm your John Deere model and serial number. This belt fits 325 (serial 070001+), 335 (070001+), 345 (070001+), and 355D (070001+) tractors. It does not fit earlier serial numbers below 070000. Measure your old belt length—OEM M131808 is 1/2" wide by 93.5" long. Check your deck size (typically 48" or 54" on these models). This is an aftermarket belt, not OEM John Deere, so verify your pulley system isn’t damaged or misaligned before installation.

Key Things to Know

• Quality vs OEM: Caltric belts are budget-friendly but may wear faster than John Deere OEM belts under heavy use. Expect 1-2 seasons with typical residential mowing.
• Installation difficulty: Moderate. You’ll need to remove the mower deck and route the belt around pulleys, tensioner, and idler. Refer to your tractor’s manual for the routing diagram.
• Common gotchas: Check that your tensioner spring is working properly—a weak spring can cause premature belt slippage or noise. Also ensure all pulleys spin freely; seized pulleys will kill any belt quickly.
• Serial number cutoff: If your tractor’s serial number is below 070000, this belt will not fit—the pulley system changed.

Should You Buy It

This belt is a solid choice if you need a quick, affordable replacement for a residential-use John Deere 325/335/345/355D with serial above 070000. It’s not built for commercial duty or heavy abuse, but for occasional mowing it delivers acceptable performance at half the OEM price. If you mow several acres weekly or want maximum longevity, spend more on an OEM John Deere belt.