Grizzly G4003G Owner's Manual page 80

To confirm that the bearings are correctly pre-
loaded:
1. Re-attach all removed lathe components and
prepare it for operation.
2. Install chuck and tighten jaws.
3.
Set spindle speed to its highest setting.
4.
Connect lathe to power and start spindle rota-
tion at a medium speed.
5.
Let lathe run for 20 minutes, periodically
checking temperature of spindle nose (refer
to the next step).
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6. Turn spindle OFF, disconnect lathe from
power, and check temperature of spindle.
—If the spindle nose is slightly warm to the
touch, you have the correct bearing pre-
load.
—If the spindle nose is hotter than you
can comfortably keep your hand on, the
preload is too tight and you must repeat
the bearing preload adjustment procedure.
When repeating the procedure, rotate the
inner spanner nut a little less during Step
12 in the preceding instructions.
Model G4003G (Mfd. Since 1/15)