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Replacing
Leadscrew Shear Pin
The longitudinal leadscrew is secured to the feed
rate gearing in the headstock with the use of a
soft-metal shear pin (see Figure 149). 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.
Replacement shear pin part number: P0768334.
Figure 149. Longitudinal leadscrew shear pin.
Tools Needed
Hammer ............................................................. 1
Punch 3mm ....................................................... 1
To replace shear pin:
1.
DISCONNECT MACHINE FROM POWER!
2.
Rotate leadscrew so shear pin faces up and
down. If connecting collar rotates indepen-
dently from leadscrew, then rotate collar so
shear pin hole aligns with those in leadscrew.
3.
Use punch and hammer to drive out pieces of
old shear pin.
4.
Make sure hole in collar and leadscrew are
aligned, then tap new shear pin completely
through holes in collar and leadscrew.
Model G0768/G0769 (Mfd. Since 8/15)
Shear Pin
Connecting
Collar
Qty
Replacing Fuse
This machine features on-board fuses designed
to protect sensitive electrical parts from thermal
damage in the event of an overload. If the spindle
does not start, replace the fuses.
The Model G0768 has two fuses, the Model
G0769 has three fuses.
G0768 Replacement Fuses: (1) P0768906,
(1) P0768911.
G0769 Replacement Fuses: (1) P0769906,
(2) P0768911.
To replace fuses:
1.
DISCONNECT MACHINE FROM POWER!
2.
Unthread fuse holders (see Figure 150) by
rotating them counterclockwise, then remove
fuses.
Fuses
Fuse
Holders
Figure 150. Fuse holders and fuses
(Model G0768 shown).
3.
Insert new fuses.
4.
Re-install fuse holders.
Fuse
Holder
Holes
-85-
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