Shear pin replacement – Grizzly G0554Z User 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

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