John Deere X300 Belt Keeps Coming Off - We Go Through The Most Common Deck Issues & Do Full Rebuild

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We check out an issue with a mower that usually presents as throwing belts, sounding loud or vibrating on a John Deere X300 and we show how to repair these issues

These are the most common problems when a belt is being thrown off consistently, the deck is cutting uneven or making loud noises.

This John Deere riding mower has a 42" edge extra deck without an idler arm handle and an electric pto clutch

We go over the full diagnostic process and repair of the issue with tips and thought process

We show how to remove the deck on an X300 and how to re-install

The only process we do not show relating to the deck is leveling it.

This was not necessary in this case and there are quite a few good videos out there on how to do it


We run into a few issues created by the use of aftermarket parts and show what we do to resolve them

Parts Used:

Deck Belt part number M154621 ( https://amzn.to/3V5vBmw )

Idler pulley part number AM135526 ( https://amzn.to/3K4pf0v ) we use Rotary 14242 ( https://amzn.to/3yzgsRC )

Idler pulley part number AM135957 ( https://amzn.to/3V5vhEk ) we use Rotary 17318

Idler pulley part number AM135773 ( am135773 ) We use MTD 532173437 ( https://amzn.to/3yq5ZYX )

Spindle pulley part number UC26511 ( https://amzn.to/4dFXNUp )

Spindle x2 of part number Am143469 ( https://amzn.to/3QMQW1y ) we use Rotary 13234 ( https://amzn.to/3ympwt7 )

Blade nut x2 of 12mm M156416 ( https://amzn.to/4by0Goy ) we use Rotary 15825

There are two different size blade nuts used in this application - make sure this is the right size for you

If you need blades and blade nuts, get the John Deere blade kit that comes with two of each nut and the blades ( https://amzn.to/3yl4r29 )

Blade Washer x 2 of Rotary 50439

Spindle bolt x 8 of 5/16-18 x 1" ( https://amzn.to/4auH2sy ) we use Rotary 15524

This will likely be the last time I use these spindles because of the difference in nut size

8ten has a good quality spindle they sell for this that I would normally use that comes with the bolt/nut (same size as original) ( https://amzn.to/3WK7Gu8 )

Deck support spindle reinforcement ring plate can be purchased at https://amzn.to/3wEavm1

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About Us:
My name is Martin. I have been repairing tools and small engines for almost 20 years. We operate a small engine repair shop in Illinois. We service / repair Briggs & Stratton, Kohler, Kawasaki, John Deere, Cub Cadet, Toro Tecumseh, Loncin, Honda, Craftsman, Husqvarna, MTD, Troy Bilt, Simplicity, John Deere, Exmark, LCT, Generac and many more brands. We work on riding mowers, walk behind mowers, snow blowers, zero turns, generators, pressure washers and much more. We normally repair about 3,000 pieces of equipment every year and look at many more that are beyond an affordable repair. Hopefully our videos will save you some money and give you the information you need to work on your own equipment or figure out the issue at hand.

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Please be careful when repairing any piece of equipment and follow all possible safety measures. This video is for entertainment purposes only.