Posted by wilson ind on August 22, 2016 at 15:21:44 from (50.235.29.222):
Reading another post about a grade 8 bolt shearing got me to think about a problem I have. The machine is a rotary cuter six feet in cutting diameter.Brand is unknown, condition is old and well rusted. Cost was $75.00 five years ago. Use is cutting brush on and close to fence rows. Its 3 point mounted on modified DC Case with steel wheels to avoid tire problems. The underside has an approx two foot diameter metal hub for attaching 2 blades. The hub is splined , siding up onto a splined shaft protruding vertically from the gearbox. This 2 foot diameter splined wheel is held up with one 5/8 course thread bolt 3 inches long. From years of wear the hub splines and gearbox shaft splines are wore to the point there is wiggle when brought up tight. I have sheered 4 bolts dropping the large wheel with blades from the machine. I have drilled and removed both grade *8 bolts as well as grade five. I am wondering if grade 2 would be a better choice as the softer bolt might nor shear as quickly as harder bolts? Seems the bolts usually shear when hitting a mound of dirt or small tree of maybe 3 inch diameter. Possibly some company makes a bolt of spring steel lol Replacing either the gear box shaft or the wheel is not foreseeable in my cheap nature!! Any advice is requested I realize the explanation is long, however most request never totally state the problem.
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