Bearing Preload - Grizzly G0750G Owner's Manual

Bearing Preload

This lathe is shipped from the factory with the
spindle bearing preload adjusted. If the spindle
ever develops a bit of end-play and the workpiece
finish suffers, you can adjust the bearing pre-
load to remove the end-play and improve the
workpiece finish.
Adjusting the bearing preload requires using a
spanner wrench or a punch and hammer. You
can either purchase the spanner wrench at a tool
store or fabricate one, using the diagram shown
in Figure 131.
Fabricate pin to / " D x
7
32
Figure 131. Spanner wrench diagram.
Tools Needed
Spanner Wrench................................................ 1
Chuck Key ......................................................... 1
Dead Blow Hammer .......................................... 1
Piece of Scrap Wood......................................... 1
Dial Indicator ..................................................... 1
Hex Wrench 6mm .............................................. 1
To adjust the preload:
1. Run the lathe for 20 minutes on high speed to
bring the lathe to a normal temperature.
2. DISCONNECT LATHE FROM POWER!
-78-
Fabricate from CRS
or HRS bar stock
/ " L and weld.
1
4
Qty
3. Remove the chuck, then shift the spindle
to neutral by positioning the alpha spindle
speed lever between "C" and "B" and the
numeric spindle speed lever between the "I"
and "II", as shown in Figure 132.
Alpha
Lever
Set between
"B" & "C"
Figure 132. Spindle speed levers set to neutral.
4.
Remove the end gear cover, then remove the
outboard spindle cover (see Figure 133).
Figure 133. Outboard spindle cover.
5.
Place the chuck key in the cam-lock socket
and keep the spindle from rotating.
6. Using a spanner wrench, or hammer-and-
punch, loosen the outer spanner nut (Figure
134) counterclockwise and remove it.
Figure 134. Loosening outer spanner nut.
Model G0750G (Mfd. Since 5/15)
Numeric
Lever
Set between
"I" & "II"
Outboard
Spindle
Cover
Outer
Spanner
Nut