Grizzly G0554Z - Manual (Page 62)

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Model g0554z (Mfg 01/09+)
Shear pin
Replacement
the longitudinal leadscrew is secured to the con-
necting collar of the gearing in the headstock with
the use of a soft-metal tapered shear pin (see
Figure 90). the shear pin is designed to break
and disengage power to the leadscrew to help
protect more expensive lathe components if you
crash your carriage or take too large of a cut and
overload the lathe.
Tools Needed Qty
hex Wrench 6mm .............................................. 1
hammer ............................................................. 1
punch 2.5mm .................................................... 1
To replace the shear pin:
1. disConnECt lAthE FroM poWEr!
2. Move the power feed lever to the horizon-
tal position to disengage it, then hold the
leadscrew in place by moving the half-nut
lever up to engage the half-nut.
3. remove the leadscrew end bracket shown in
Figure 91.
Note: Take care not to put pressure on the
leadscrew or rods when the end bracket is
removed to prevent bending them.
Figure 91. leadscrew end bracket.
leadscrew
End Bracket
4. use the carriage handwheel to slowly pull the
leadscrew away from the connecting collar
on the gearbox.
5. drill out the pieces of the shear pin from the
leadscrew and connecting collar, then care-
fully re-insert the leadscrew back into the
collar so that the shear pin hole is correctly
aligned through both parts.
Note: Keep in mind that the shear pin hole
is tapered and must be properly aligned to
accept a new tapered shear pin.
6. re-install a new tapered shear pin.
7. re-install the leadscrew end bracket
Figure 90. longitudinal leadscrew shear pin.
shear pin
Connecting Collar