As is the case in most things of a mechanical nature, heavy usage has a tendency to reveal the weak link in equipment design. In personal use, we never had undue problems with a belt driven mower...as I recall, our mower had a dual belt drive.

Also, when the afore-mentioned weak link is located, something has to give....rather a belt slipping momentarily than replacing sections, guards, or snapped pitmans.

"Forget pounds and ounces, I'm figuring displacement!"

If we accept that: MBG(+)FGSF(=)HBG(F1)
And we surmise that: BG(>)HBG(F1) while GSF(<)HBG(F1)
Would it hold true that: HBG(F1)(+)AM500(x)q.d.(=)1.5lbGRWT?
PB answer: It depends.