Check your idlers on the deck as they are the most common culprit.
Go to http://outdoorpowerinfo.com/repairs/deere_stx38_gear_drive_belt.asp for pictures and descriptions of installation of drive belt and deck belt for John Deere STX38 Tractor with black mower deck.
bladebelt diagram for john deere stx38 yellow deck
Outdoor Power Equipment Website
The belt is a M74747 which is 1/2" x 105"
How do you replace a mower deck belt on a stx38 hydro
Changing a JD STX38 transmission drive belt.Today I undertook removing my almost failed transmission drive belt on a John Deere STX38. In order to do so (it had come off both the engine pulley and the transmission pulley but was not broken), I had to unbolt the brake pedal lock pin, and disconnect the front wheel steering bars (cotter pin and washer holding each bar to the front wheel axels). The belt then could be removed as the steering arms pass under the belt when it is in place, and the bars are attached by cotter pin and washer, one set at the wheels, and another set at the steering arms in the middle of the chassis. There is one idler pulley in a v shape and another idler pulley that is flattened between the transmission and the steering arms. The back of the belt pushes against the flattened pulley, and the inside (v side) of the belt passes the v shaped pulley as these 2 pulleys provide belt tension.
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The John Deere 48 mower deck belt pattern diagram can be obtained from most John Deere dealerships. Many times when you purchase the belt the parts store will give you a belt pattern diagram.
i need a diagram for installing a belt on a john deere lawn mower 330
To install the belt for John Deere, first get his permission. Once one has hi permission, select a belt for him. Once the belt is selected, proceed and wear the belt for him.