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on the mower deck
john deere LT155 38inch cut mower deck
The 42 inch deck belt is 104 X 1/2 inches.
Its yours how should we know?
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38'' deck
Measure the width of the deck with a tape measure.
How do you change a mower deck belt on a John Deere L130?Read more: How_do_you_change_a_mower_deck_belt_on_a_John_Deere_L130
In most cases removing the deck will make the job easier and faster.
mower manuls are at this link http://manuals.mtdproducts.com/mtd/DocGetter?doc=769-00533.pdf
Disingage the mower deck take off the mower deck look under neath their and replace the belt
need a diagram for the belt on my L120 lawn mower