Ford 755B Backhoe "Fibre Gear"

[Boomer]

I recently had to pull my engine after losing all power to my hydraulics. (The hydraulic pump is fine.) The problem: All of the bolts (approx 14) that attached the "ring gear" or what is commonly refered to as the "fibre gear" to the fly wheel were sheared off. I had the engine overhauled and replaced the "fibre gear". My question: I am very nervous about reinstalling everything without knowing what caused the bolts to shear in the first place. Does anyone have an idea why this happened ? This may be coincidental but when I lost all power I also discovered a hydraulic leak underneath the machine. I lost a considerable amount of fluid. Thank you all very much.