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For Machines Mfg. Since 5/11 | 13" Heavy 13® Gearhead Lathe | |
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6.Use the magnet to remove the shear pin head, then rotate the lathe spindle to line up the inner and outer bores, as shown in Figure 131. Next, use the magnet to remove the other half of the broken shear pin when it becomes visible.
Inner Bore
Outer Bore
Figure 131. Shear pin bores aligned.
7.Insert the blow gun tip into the shear pin hole, blow out the hole with compressed air, then put a drop of oil in the hole.
8.Insert the new shear pin into the bore, as shown in Figure 132.
Note: If the pin does not freely slide into the bore, DO NOT use a hammer on the pin or you may permanently damage the shear mechanism and bore, which would make it nearly impossible to remove and install a new shear pin later.
Instead, take the time to carefully line up the two bores. You may need to file a slight chamfer on the end of the pin to make it easier to insert.
Shear Pin
Figure 132. New shear pin installed in bore.
9.With the pin completely seated in the bore and the head flush with the leadscrew shoulder, slide the shroud washer against the shoulder, then rotate the washer 180° to completely cover the head of the shear pin, as shown in Figure 133.
Rotate
Washer
Slot 180°
Figure 133. Shroud washer positioning.
