Another thread about the shear bolts:
http://www.tractorbynet.com/forums/kubota-owning-operating/233449-kubota-bx-2750d-snow-blower.html
Helpful thread, thank you. The two things I got out of it were torque to 9ft-lbs and MB Tractor and Equipment | The Best Tractors and Equipment on Earth (R)
70060-01074 $.85
70060-01337 $1.95
Where I will order some additional spares. I am suspecting that the 'traction sand' may be the problem for me. I am guessing that it is getting in the edge of the fan blades and binding things up.