H&S GM 170, Operator'S Manual And Parts List

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Transfer Auger Shear Device
The transfer auger shear bolts are accessible only through the mill cover. This shear bolt protects the
transfer auger flighting. If the shear bolt fails, the transfer auger will stop rotating even though the mixing
auger and transmission drive shaft will continue to rotate.
NOTE: Two shear bolts are provided on the shear hub, but only one bolt serves as shear protection; the
second bolt is provided so that one of the Bolts is always accessible for service regardless of where the
auger stops after the bolt shears.
SERVICE
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To set the shear bolt in the correct driving position,
proceed as follows:
1. Disengauge the PTO, shut-off tractor and
remove key.
2. For access to the shear bolt, open mill cover
door and remove the material in the bottom of
the transfer auger.
3. Loosen the accessible shear bolt lock nut.
NOTE: If the gap between the bolt head and the shear hub is less than 1/8" (3 MM), the bolt must be
replaced. Use only a ¼ x 1: grade 5 shear bolt stored on the inside of the front cover.
4. Attempt to turn the bolt clockwise. If it does not turn, the cavity is not under the bolt and the
shaft will have to be rotated 90 degrees.
5. With the cavity under the shear bolt, turn the bolt clockwise 3 full turns or about 5/32" (8 mm).
This will place the shear bolt in the correct driving position.
IMPORTANT: Do not turn the shear bolt less than or more than 3 full turns to insure the correct
driving position. Do not readjust the other shear bolt.
6. Tighten the lock nut and grease fitting on the hub to prevent the mechanism from seizing.
After the cause of the shear bolt failure is corrected and the bolt has been replaced, place the mill/blower
engaging pin in the engaged position and rotate the flywheel by hand checking the intake auger for
rotation before attempting to resume grinding.
7. Close the mill cover door and resume operation.
IMPORTANT: When restarting the tractor, place the throttle at idle before engaging the PTO.