Leadscrew Shear Pin Replacement - Grizzly G0949G Owner's Manual

Leadscrew Shear Pin
Replacement
A straight 5 x 20mm brass shear pin (see Figure
112) holds the leadscrew and the drive hub
together. The pin is designed to break and disen-
gage the power transfer to the leadscrew to help
protect more expensive lathe components in the
case of a carriage crash or the lathe is overloaded.
Figure 112. Leadscrew shear pin.
Tools Needed
Hammer ............................................................. 1
Dowel Punch ⁄ " ............................................... 1
3
16
Brass Shear Pin (#P0949G274) ........................ 1
Model G0949G (Mfd. Since 01/22)
Drive
Collar
Leadscrew
Leadscrew
Brass
Shear Pin
Qty
To replace leadscrew shear pin:
1. DISCONNECT MACHINE FROM POWER!
2. Place quick-change gear levers in neutral.
3. Disengage half-nut lever and move FWD/
REV switch to "0" (see Figure 113) so
leadscrew can be rotated by hand.
FWD/REV Switch
Figure 113. FWD/REV switch set to "0".
4. Rotate leadscrew so shear pin is facing up
and down. If drive collar rotates independent-
ly of leadscrew, then rotate collar so shear
pin holes align with those in leadscrew.
5. Use punch and hammer to drive out pieces of
old shear pin.
6. Make sure holes in collar and leadscrew are
aligned, then tap new shear pin completely
through holes in collar and leadscrew.
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