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earthwrks,
I think I may have figured out the problem. After I made the post I went back and got the broken bolts and the top of the heads show no hardness marks. I am beginning to believe they gave me a bolt similar to a shear bolt like in combines or mower shafts. So I feel your first answer is the same one I came up with, soft bolts.
My neighbor here tells me one of the local tractor dealers has a good selection of metric bolts in several grades of hardness.
The lower bolt on this tractor doesn�t require a nut and lock washer, it goes through a threaded section of the lower housing of the alternator; the bolt threads completely through the housing and then tightens down; the end can be removed through the front plate with just finger pressure after the bolt is broken. The belt was measured with a straight edge before starting and is straight and when watched for any change in tracking while idling, no changes noted; the belt seems to running straight and true.
There doesn�t seem to be any problem with the bearing within the alternator while turning, everything seems to be smooth.
I am beginning to think the bolts I had were just too soft to hold up under any pressure at all.

Hinomoto C174 alternator bolt snapping
Hinomoto
Replies 3 Post by JimK67