There should be a tag on the very rear of the mower, behind and below where the drivers seat is that will have that information.
what years were JOHN DEERe 920 built
Fram PH7575 is what I use on my STX38.
how do i check the hydro transmisson fluid on a stx38
eat S_H_I_T
30 lbs
On the deck
The John Deere STX38 typically uses the same hood design as other models in the STX series, particularly the STX30 and STX46. However, due to variations in production and design changes, it's best to verify compatibility through the part number. For a precise fit, checking with a John Deere dealer or parts catalog is recommended.
I can not find one either
stx 38 fly wheel
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
my stx38 currently has a FRAM PH3614 on it. hope that helps you =)