Grizzly G0740 owner manual Leadscrew Shear Pin Replacement, To replace the shear pin

Leadscrew Shear Pin

Replacement

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.

	9mm
	7mm
5.8mm	3mm
	0.5mm
0.2mm	0.2mm
NOTE: Shear Pin Material = S45C (SAE 1045)

Figure 128. Shear pin specifications.

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.

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

-82-

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.

Shear Pin	Shroud
Head
	Washer
	Cutout

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.

Model G0740 (Mfg. Since 11/12)