-82-
Model G0740 (Mfg. Since 11/12)
The leadscrew is secured to a connecting col-
lar that is part of the headstock drivetrain with
the use of a soft-metal shear pin. The shear pin
is designed to break and disengage the power
transfer to the leadscrew to help protect more
expensive lathe components in the case of a car-
riage crash or the lathe is overloaded.
Contact Grizzly Customer Service at (570) 546-
9663 to order a replacement shear pin (Part
Number P07400844) or use the specifications in
Figure 128 to fabricate your own.
To replace the shear pin:
1. DISCONNECT LATHE FROM POWER!
2. Rotate the shroud washer on the leadscrew
shown in Figure 129, so that the cutout lines
up with the shear pin head.
Leadscrew Shear Pin
Replacement
Figure 129. Shroud washer and shear pin
alignment.
3. Put on safety glasses.
4. Move the retaining ring shown in Figure 130
away from the shroud washer.
Figure 130. Shear pin access.
5. To make enough room to remove the shear
pin, move the shroud washer away from the
shear pin and against the retaining ring, as
shown in Figure 130.
6. Set up the lathe for threading (refer to Page
57) so the leadscrew turns when you rotate
the spindle in the next step.
Shear Pin
Head
Shroud
Washer
Cutout
9mm
7mm
5.8mm
0.5mm
0.2mm
0.2mm
3mm
NOTE: Shear Pin Material = S45C (SAE 1045)
Figure 128. Shear pin specifications.
Tools Needed: Qty
External Retaining Ring Pliers #1 ..................... 1
Magnet ............................................................... 1
Safety Goggles .................................................. 1
Blow Gun w/Compressed Air ............................ 1
Light Machine Oil................................As needed
If you fabricate your own shear pin, make
sure to use the material and dimensions
specified in Figure 128. Otherwise, the shear
pin may not provide the intended protection
and lathe damage could result.
