Grizzly G4000 Owner's Manual page 39

"a"
Change gears
E-Clip
figure 50. "a" change gears and shaft
components.
5.
Carefully remove the keyed bushing from the
center of the gears, orient the 28t and 40t
gears together, then re-insert the bushing to
secure the assembly.
6.
slide the "a" gears onto the gear shaft so
that the 28t gear is facing out and the 40t
gear meshes with the 80t gear above it, then
secure them in place with the E-clip.
7.
remove the special bolt and washers that
secure the 120/127 combo gear, then remove
the gears from the gear shaft (see figure
51).
120/127t
gears
special Bolt
& Washers
figure 51. 120/127t gears and "b" change gear
removed.
8.
Carefully remove the keyed bushing from the
center of the gears, orient the 120t and 127t
gears together, then re-insert the bushing to
secure the assembly.
Model G4000 (Mfg. Since 8/09)
shaft
Keyed Bushing
special t-nut
"b" Change gear
9.
With the 120t gear facing out, insert the
special bolt with the slotted washer through
the front of the assembly, slide the remaining
flat washer onto the bolt from the rear of the
gears.
10. thread the bolt into the special t-nut on the
pivot arm, but leave it loose and slide the
120/127t gears to the left and away from the
"b" gear.
11. remove the cap screw and flat washer that
secure the "b" gear, then remove the gear
from the gear shaft (see figure 51).
12. Align the keyway on the 60t gear with the
gear shaft key, then install the gear and
secure it with the cap screw and flat washer.
13. Move the 120/127t gears to the right and
mesh the 120t gear and the 60t "b" gear,
then tighten the special bolt to secure the
120/127t gears in place.
14. rotate the pivot arm up so that the 127t and
28t "a" gear mesh, then tighten the pivot arm
cap screw to secure it in place, as shown in
figure 52.
figure 52. Change gears configured for a feed
rate of 0.0078".
15. rotate the spindle pulley by hand to make
sure that all the change gears are properly
meshed, freely rotating, and with 0.002"—
0.003" of backlash
— if the change gears are not properly meshed
and freely rotating, repeat this procedure.
16. Close and secure the change gear cover.
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