I need a diagram of a drive belt for a Murray riding mower Model number 425612X99A and engine # Model 313707 /type 0126-E1/code 01905ZE, so I can change it for an old friend that is down in luck. Any diagrams will be highly appreciated.

No diagram on my file but try this to download a manual. Murray 309008X99 Riding Mower Owner's Manual (http://www.manualnguide.com/download/manual-guide/murray-309008x99-riding-mower-owners-manual.html)