Replace drive belt yardman rideing lawn mower

Lisa, You could try to Google search your make and model# manual.
Check the attached links manual,instruction and guides, Good luck
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46 Deck Belt Pulley Routing Riding Mower
Replace Your Lawn Tractor Deck Belt
MTD YARD MACHINES 46 CUT RIDING MOWER DECK BELT INSTALLATION REPLACEMENT
Yard Man 604 Operator Manual

model # required,serial #, approx year made, is it auto with 2 drive belts or shift with 1 belt

check your drive belts, pulley's and belt tensioner... you could of gotten better help if you would of included the model #

Try SearsPartsDirect.com they may be able to get one

check the belt tensioner

Most common size is 19mm

i need a diagram showing for a 20hp yardman tractor model number 13AT605G755

try parts direct .com they may be able to help

have you replaced the belt recently? try slacking tension on the belt.

go to the online web site for the yardman this will give you the guide on how to replace the belt.