Between the drive pulley and the deck pulley the drive belt goes either over or under the horizontal bar about half way. So, which is it, over or under? The belt was clearly in the wrong place and snapped as it jammed. But, for the life of me, I cannot recall if I had it over or under that bar. Any help appreciated. Thanks

JohnK, January 2013

It's the long belt (an A74) and runs from the motor pulley to the mower deck out front where another belt then connects power to the blades.
As that long belt passes under the operator's seat it goes either under or on top of a horizontal bar. What I'm asking is if the belt goes on top or underneath that bar.
Anybody with a rider 850-12 could take a look as the parts diagrams are not helpful on this subject.

JohnK, January 2013