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12. Tighten spanner nut an additional
its circumference. See Figure 138 for exam-
ple of this measurement.
Figure 138. Final spanner nut rotation.
13. Without allowing inner spanner nut to tighten
any further, install and tighten outer spanner
nut against inner nut.
Note: Do not overtighten the outer spanner
nut because additional preload can force the
bearings even tighter against the races in the
headstock and cause the headstock to com-
press, or crack, or cause bearing failure.
14. Re-install outboard spindle cover.
Model G0750GV (Mfd. Since 03/18)
⁄
" along
1
16
⁄
" Travel
1
16
To confirm that bearings are correctly
preloaded:
1.
Re-attach all removed lathe components and
prepare it for operation.
2.
Install chuck and tighten jaws.
3.
Set spindle speed range lever to high.
4.
Connect lathe to power and turn lathe spindle
ON. Increase spindle speed to maximum
using variable spindle-speed dial.
5.
Let lathe run for 20 minutes, periodically shut-
ting it down and checking temperature.
6.
Turn spindle OFF, disconnect lathe from
power, and check temperature of spindle.
— If spindle nose is slightly warm to the
touch, you have correct bearing preload.
— If spindle nose is hotter than you can com-
fortably keep your hand on, the preload is
too tight and you must repeat bearing pre-
load adjustment procedure. When repeat-
ing the procedure, rotate inner spanner
nut a little less during Step 12 in the pre-
ceding instructions.
-79-
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