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For Machines Mfg. Since 3/11 Turn-Nado
®
Gearhead Lathes
-85-
SERVICE
5. Move the retaining ring shown in Figure
130 away from the shroud washer, then
move the shroud washer away from the
shear pin and against the retaining ring.
This will create room for you to remove the
shear pin.
Figure 130. Shear pin access.
Retaining Ring
6. Use the magnet to remove the shear pin
head.
7. Rotate the lathe spindle to line up the inner
and outer bores, as shown in Figure 131,
and use the magnet to remove the other half
of the broken shear pin.
Figure 131. Shear pin bores aligned.
Outer Bore
Inner Bore
Figure 132. New shear pin installed in bore.
Shear Pin
8. Put on safety goggles, insert the blow gun tip
into the shear pin hole and blow out the hole
with compressed air.
9. Put a drop of oil in the hole, then 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 if it breaks
again. Instead, take the time to carefully
line up the two bores so it slides in easily.
Chamfer the end of the pin if necessary to
make it easier to insert.
10. 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.
Figure 133. Shroud washer positioning.
Rotate
Washer
Slot 180°